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Microstructural study of concrete performance after exposure to elevated temperatures via considering C–S–H nanostructure changes High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Mohammad Amiri,Marzieh Aryanpour,Fatemeh Porhonar
Abstract Evaluation of the concrete behavior in elevated temperatures is important in terms of first, structural construction safety under specified loadings, and second, measuring the loading capacity to continue operation. Furthermore, concrete behavior at high temperatures is strongly affected by microstructure. The calcium silicate hydrate (C–S–H), a nanostructure which is produced by hydration
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Single-source-precursor synthesis and characterization of SiAlC(O) ceramics from a hyperbranched polyaluminocarbosilane High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Le Yang,Pei Zhang,Yao Feng,Zhaoju Yu
Abstract Polyaluminocarbosilane (PACS) as a single-source-precursor of SiAlC(O) ceramic was prepared by reacting a hyperbranched allylhydridopolycarbosilane (AHPCS) and aluminum(iii) acetylacetonate (Al(acac)3), and the PACS was characterized using gel-permeation chromatography, Fourier-transform infrared spectroscopy, and nuclear magnetic-resonance spectroscopy. The polymer-to-ceramic transformation
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Discrete probability model-based method for recognition of multicomponent combustible gas explosion hazard sources High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Wenhua Ye,Yang Feng,Yangming Chen
Abstract Aiming at the problems of poor sensitivity and low accuracy of traditional combustible gas explosion hazard identification methods, the discrete probability model was introduced to design a multicomponent combustible gas explosion hazard identification method. Fem3 model is selected to analyze the diffusion mode of multicomponent combustible gas, and the calculation formula of diffusion velocity
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Application on oxidation behavior of metallic copper in fire investigation High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Xie Dongbai,Hong Hao,Duo Shuwang,Li Qiang
Abstract In fire investigations, the most important aspect is determining the presence of a liquid accelerant at the fire scene. The presence or absence of accelerants is critical evidence during trials for fire cases. Upon exposure to high temperatures, metallic substances undergo oxidation, which can be imparted by accelerants in the fire. Oxides and substrates found on metal surfaces offer valuable
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Removal of SiC and Si3N4 inclusions in solar cell Si scraps through slag refining High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Yaqiong Li,Lifeng Zhang,Di Pan
Abstract Silicon was recovered from solar cell Si scraps through 42.5 mol% SiO2–42.5 mol% CaO–15 mol% Al2O3 slag refining. The motion behaviors of Si3N4 and SiC were observed in situ and real-time using a high-temperature laser confocal microscope, and the recovery of Si through slag refining was carried out at 1,500°C for 30 min. Results indicated that both SiC and Si3N4 inclusions were concentrated
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Optimization of alkali metals discharge performance of blast furnace slag and its extreme value model High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Yan-bo Chen,Yong Deng,Ran Liu,Li-da Chen,Xing-min Guo
Abstract In order to improve the alkali metals discharge capacity of slag, the gas-slag balance method was used to carry out the slag alkali metals discharge experiments, the effect of slag composition on alkali metals discharge performance of slag was studied, some suggestions were put forward to optimize the alkali metals discharge performance of slag and the extreme value model was established.
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Corrosion behavior of WC–Co coating by plasma transferred arc on EH40 steel in low-temperature High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 QiZheng Cao,Li Fan,HaiYan Chen,YuRong Xu,LiHua Dong
Abstract To investigate the corrosion behavior of WC–Co composite coating, plasma transferred arc (PTA) welding was applied to prepare WC–Co coating on hull steel EH40 for achieving good metallurgical bonding. The phases of coatings were mainly composed of WC particles, solid solution γ-Co, Fe3Ni2, SiO2 and Mo2C. After electrochemical test, it can be concluded that Co-based coating with 45% WC content
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Pre-reduction of carbon-containing pellets of high chromium vanadium–titanium magnetite at different temperatures High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Kui-song Zhu,Xiang-kui Cheng,Yin-he Lin,Ying-tao Zhao,Guo-liang Yin,Jing-wei Li,Jun Wang,Li Cao
Abstract The effect of temperature on phase transformation, metallization rate, carbon residue and agglomeration of metal Fe after the pre-reduction of carbon-containing pellets in high-chromium vanadium–titanium magnetite (HCVTM) was investigated. The results indicated that titanomagnetite was finally reduced to metal Fe and (Mg, Fe)Ti2O5 without low valence titanium oxide with increasing pre-reduction
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Effect of the weld parameter strategy on mechanical properties of double-sided laser-welded 2195 Al–Li alloy joints with filler wire High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Qihang Xv,Gan Tian,Wei Zhang,Zhengwei Yang,Anbo Ming
Abstract Compared with single-sided welding, double-sided welding can melt through thicker workpieces and improve the mechanical performance of the weld. In this work, laser welding with filler wire of 2195 Al–Li alloy plates is conducted via double-sided out-of-sync welding. By combining experiment and numerical simulation results, the influence laws of the weld’s mechanical properties are studied
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Design, fabrication, and testing of CVI-SiC/SiC turbine blisk under different load spectrums at elevated temperature High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Xiaojun Guo,Jian Li,Yuqi Zeng,Xiaozhong Huang,Longbiao Li,Youliang Xu,Xiaoan Hu
Abstract In this article, design, fabrication, and testing of SiC/SiC turbine blisk with the fiber’s preform of Spider Web Structure (SWS) subjected to different load spectrums at elevated temperature are conducted. Micro-CT scans are conducted to show the fibers preform and defects inside the SWS-SiC/SiC turbine blisk. For 2D plain-woven SiC/SiC composite under monotonic tensile loading at an elevated
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Effect of different welding procedures on microstructure and mechanical property of TA15 titanium alloy joint High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Bingzhou Hu,Shaogang Wang,Kang Li
Abstract TA15 titanium alloy is welded by electron beam welding (EBW) and pulsed Nd:YAG laser beam welding (P-LBW), respectively. Results show that the fusion zone (FZ) is mainly composed of acicular α′ martensite, while the acicular α′ martensite in the FZ of EBW joint is coarser. The quantity of martensite in the FZ of EBW joint is larger and the distribution of martensite is denser. The microstructure
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Smelting high purity 55SiCr automobile suspension spring steel with different refractories High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Yang Li,Changyong Chen,Guoqing Qin,Zhouhua Jiang
Abstract We performed a laboratory investigation at 1,873 K using a MoSi2 furnace to study the effect of refractories on inclusions in 55SiCr suspension spring steel. Three types of crucible materials (Al2O3, MgO·Al2O3, and MgO–CaO) were investigated. The results of this study indicated that SiO2, Al2O3, and MgO·Al2O3 were not suitable for making 55SiCr suspension spring steel. By contrast, MgO–CaO
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Electrical properties of zinc nitride and zinc tin nitride semiconductor thin films toward photovoltaic applications High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Yong Wang,Takeo Ohsawa,Fahad Alnjiman,Jean-Francois Pierson,Naoki Ohashi
Abstract Zn3N2 (ZN) and ZnSnN2 (ZTN) are a promising class of nitride semiconductors for photovoltaic and light-emitting-diode applications due to their particular electrical and optical properties, elemental abundance and non-toxicity. So far, most of the experimental results show the degenerate carrier concentration. However, we find that low-temperature growth of these films in a chamber with ultra-high
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Effect of in situ observation of cooling rates on acicular ferrite nucleation High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Tiantian Wang,Shufeng Yang,Jingshe Li,Hao Guo,Zhengyang Chen
Abstract The effect of cooling rates on acicular ferrite (AF) nucleation was observed in situ by laser scanning confocal microscopy. The precipitation characteristics of TiN–MnS inclusions, the austenite grain size, and the content and morphologies of AF were analyzed and compared under different cooling rates. The results indicated that with the increase of the cooling rate, the size of TiN–MnS inclusions
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Reduction swelling mechanism of hematite fluxed briquettes High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Wang Ping,Wu Hao,Chun Tie-jun,Zhou Song,Zhou Tian-bao
Abstract The reduction swelling behaviors of the fluxed briquettes with basicity (CaO/SiO2) in the range of 0.33–1.33 were determined by adding analytical-grade CaO. Results showed that with the increase of basicity, the diameter, volume, and porosity of briquettes increased gradually, whereas the diameter, volume, and porosity of briquettes decreased when the basicity was greater than 0.83. The volume
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Promoting of metallurgical bonding by ultrasonic insert process in steel–aluminum bimetallic castings High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Rui Guo,Daxin Zeng,Fengguang Li
Abstract It is challenging to efficiently prepare bimetallic composites with excellent metallurgical bonding. Here, we present a strategy, the ultrasonic insert casting (UIC) process, to solve this problem. The ultrasound cavitation effectively destroys the oxide film and promotes diffusion in the UIC-prepared steel/aluminum bimetallic castings, resulting in a uniform reaction layer between steel and
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Study on the thermodynamic stability and evolution of inclusions in Al–Ti deoxidized steel High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Jun Wang,Linzhu Wang,Xiang Li,Junqi Li,Chaoyi Chen,Changrong Li,Changling Zhuang
Abstract To investigate the thermodynamic stability and the evolution process of inclusions in the Al–Ti deoxidized steels, both laboratory experiments and thermodynamic calculations were conducted in the present work. Scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and Al2O3–Ti2O3–TiO2 phase diagrams were used to investigate the composition of oxide inclusions after adding various
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The precipitation behavior of second phase in high titanium microalloyed steels and its effect on microstructure and properties of steel High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Xiaopei Guo,Tao Li,Zhiqiang Shang,Yulin Zhu,Guannan Li
Abstract The thermodynamic precipitation behavior of the second-phase particles in Nb-containing high titanium microalloyed steel has been studied by calculation in this article. It is revealed that FCC_A1#2 is isomorphic with FCC_A1#3 and the contents of Ti and Nb elements are much higher than that of FCC_A1#3. The influence of different quenching temperatures on microstructure and mechanical properties
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Prediction model of interfacial heat transfer coefficient changing with time and ingot diameter High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Yihong Li,Yukun Zhao,Huiqin Chen
Abstract We established and simulated finite element solidification models of ingots with 180, 380, 800, 1,300, and 1,880 mm diameters, and the solidification process temperature distributions for the five ingot sizes were assessed by Fluent. On this basis, we established a mathematical model for the interfacial heat transfer coefficient between the ingot and the ingot mold, as well as the ingot diameter
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Effect of microstructure on tribocorrosion of FH36 low-temperature steels High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Liang Shi,Da Huo,Yanhua Lei,Shaopeng Qu,Xueting Chang,Yansheng Yin
Abstract The tribocorrosion performance of low-temperature steels is vital for use in hostile environments. This study aims to investigate the tribocorrosion behavior of FH36 low-temperature steel with two distinct microstructures of tempered martensite (TM) and tempered sorbite (TS), respectively. Also, the coefficient of friction, surface morphologies, electrochemical properties, and corrosion features
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Development of a huge hybrid 3D-printer based on fused deposition modeling (FDM) incorporated with computer numerical control (CNC) machining for industrial applications High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Jeongsu Lee,Jiyoung Song,Young Chul Lee,Jeong Tae Kim
Abstract As recent advances in additive manufacturing (AM) technology has grown rapidly over the past decades, a wide range of applications in the various field has been proposed. Especially, large-scale 3D printing technology has emerged as one of the most innovative alternatives to the traditional manufacturing process due to its simple, fast, and cost-efficient features. In this article, we proposed
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Boron removal from silicon melt by gas blowing technique High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Arman Hoseinpur, Stefan Andersson, Michael Müller, Kai Tang, Jafar Safarian
Due to the detrimental effects of boron (B) on the efficiency of silicon (Si) photovoltaic cells, complete boron removal from Si is necessary to produce solar grade Si (SoG–Si, with a maximum limit of 0.1 ppmw boron). Gas refining is a promising technique for boron removal from Si, in which the thermodynamic equilibrium never establishes. Hence, by starting from any B concentration in the melt, the
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Dephosphorization kinetics of high-P-containing reduced iron produced from oolitic hematite ore High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Liwei Liu, Guofeng Li, Yanfeng Li, Libing Zhao
To comprehensively utilize Fe and P in oolitic hematite ore, an innovative method was proposed to enhance P enrichment in the reduced iron during the reduction process. The reduced iron was then converted to low-P-containing molten iron and high-P-containing slag in the presence of CaO–SiO 2 –FeO–Al 2 O 3 slag. In this study, the P content of the final iron after 0–1,800 s dephosphorization was investigated
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In-phase thermomechanical fatigue studies on P92 steel with different hold time High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Xin Li, Chang-Yu Zhou, Xiang-Ming Pan, Le Chang, Lei Lu, Guo-Dong Zhang, Fei Xue, Yan-Fen Zhao
The effect of hold time with 0, 20, and 40 s on in-phase thermomechanical fatigue (TMF) behavior and life of P92 steel is investigated in this study. TMF tests are carried out under mechanical strain control with strain amplitudes of 0.4 0.4 , 0.6 0.6 , and 0.8 % 0.8\text{\%} , and temperature range of 550–650°C which is closely relevant to the operating condition in power plant. TMF tests are performed
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Dynamics at crystal/melt interface during solidification of multicrystalline silicon High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Kozo Fujiwara, Lu-Chung Chuang, Kensaku Maeda
A fundamental understanding of crystal growth dynamics during directional solidification of multicrystalline Si (mc-Si) is crucial for the development of crystal growth technology for mc-Si ingots for use in solar cells. In situ observation of the crystal/melt interface is a way to obtain direct evidence of phenomena that occur at a moving crystal/melt interface during growth. In this review, some
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Synthesis of alkaline-earth Zintl phosphides MZn2P2 (M = Ca, Sr, Ba) from Sn solutions High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Ryoji Katsube, Yoshitaro Nose
Exploration of suitable partner materials (so-called buffer layer or n-type emitter) for each light-absorbing material is essential to practicalize various emerging photovoltaic devices. Motivated by our recent discovery of a partner material, Mg(Mg x Zn 1− x ) 2 P 2 , in Mg/Zn 3 P 2 solar cells, the related series of materials M Zn 2 P 2 ( M = Ca, Sr, Ba) is of interest to the application in pnictide-based
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Numerical and experimental research on solidification of T2 copper alloy during the twin-roll casting High Temp. Mater. Process. (IF 1.5) Pub Date : 2022-01-01 Zheng Lv, Zhen-Jun Sun, Zhi-Hui Hou, Zhou-Yi Yang, Xi-Liang Zhang, Yin-Dong Shi
Based on CAFE theory and KGT model, the twin-roll strip casting mathematical model was established to solve the dendrite growth and solidification of T2 copper alloy in the molten pool. The influence mechanism of casting temperature, heat transfer, and other technological conditions on the microstructure of strip was analyzed. The results showed that the liquid metal formed 35 µm chilling layer after
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A Characterization of Hot Flow Behaviors Involving Different Softening Mechanisms by ANN for As-Forged Ti-10V-2Fe-3Al Alloy High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-02-28 Guo-zheng Quan, Zhen-yu Zou, Hai-rong Wen, Shi-ao Pu, Wen-quan Lv
The isothermal compressions of as-forged Ti-10V-2Fe-3Al alloy at the deformation temperature range of 948–1,123 K and the strain rates in the range of 0.001–10 s−1 with a height reduction of 60% were conducted on a Gleeble-3500 thermo-mechanical simulator. The flow behaviors show nonlinear sensitivity to strain, strain rate and temperature. Based on the experimental data, an artificial neural network
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A Characterization for the Hot Flow Behaviors of As-extruded 7050 Aluminum Alloy High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-02-28 Guo-zheng Quan, Jin Liu, An Mao, Bo Liu, Jin-sheng Zhang
The deep understanding of flow behaviors of as-extruded 7050 aluminum alloy significantly contributes to the accuracy simulation for its various plastic forming processes. In order to obtain the improved Arrhenius-type equation with variable parameters for this alloy, a series of compression tests were performed at temperatures of 573 K, 623 K, 673 K, 723 K and strain rates of 0.01 s−1, 0.1 s−1, 1
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Laboratory Study on Oxide Inclusions in High-Strength Low-Alloyed Steel Refined by Slag with Basicity 2–5 High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-02-28 Huixiang Yu, Xinhua Wang, Jing Zhang, Wanjun Wang
Non-metallic inclusions in high-strength low-alloyed steel refined by slag with basicity (B) 2–5 and Al2O3 content 20%–30% (in mass percent) were investigated by slag–metal equilibrium experiments in laboratory and thermodynamic calculations. Most inclusions in equilibrium were quasi-spherical CaO-MgO-Al2O3-SiO2 system and the sizes were less than 5 µm. The average content ratio, CaO/Al2O3 and CaO/SiO2
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Study on Evolution of Ti-containing Intermetallic Compounds in Alloy 2618-Ti during Homogenization High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-02-28 Jianhua Wang, Tingting Liu, Ya Liu, Changjun Wu, Xuping Su
Dispersive Al3Ti particles introduced into alloy 2618-Ti are enclosed gradually by ternary Al18Mg3Ti2 phase during homogenization, which can be described as a “peritectic reaction”. This reaction is sensitive to homogenization temperature and time within 24 h but not so sensitive to homogenization time after 24 h because of its special growth pattern. The evolution of the intermetallic compounds during
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Description of Grain Refinement by Dynamic Recrystallization Under Hot Compressions for As-Extruded 3Cr20Ni10W2 Heat-Resistant Alloy High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-02-28 Guo-Zheng Quan, An Mao, Zhen-Yu Zou, Gui-Chang Luo, Jian-Ting Liang
The dynamic recrystallization (DRX) behavior of as-extruded 3Cr20Ni10W2 heat-resistant alloy was investigated by hot compressions with a fixed height reduction of 60% over a temperature range from 1,203 to 1,403 K and a strain rate range from 0.01 to 10 s−1. Results show that DRX occurs more easily at lower temperatures and higher strain rates, the stress level increases significantly with the increase
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Dry Sliding Wear Behaviours of Valve Seat Inserts Produced from High Chromium White Iron High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-02-28 Ali Kalyon, Dursun Özyürek, Mustafa Günay, Hasan Aztekin
In this present study, wear behaviours of high chromium white iron valve seat inserts and tappets used in the automotive sector were investigated. Wear behaviours of three different rates of high chromium white cast irons (containing 10, 12 and 14% chromium) were examined under heavy service conditions. For that purpose, the produced valve seat inserts were characterized through Scanning Electron Microscopy
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Processing and Characterization of CrB2-Based Novel Composites High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-02-28 R. D. Bedse, J. K. Sonber, K. Sairam, T. S. R. Ch. Murthy, R. C. Hubli
This paper presents the results of investigations carried out on processing and characterization of CrB2-based novel composites. Niobium metal powder was used as additive to form new composites. Hardness and fracture toughness of chromium boride increased by addition of niobium. CrB2 composites were prepared by addition of 2.5, 10 and 20 wt.% Nb. Density of higher than 95% ρ th was achieved in all
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Reactions at the molten flux-weld pool interface in submerged arc welding High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Theresa Coetsee,Frederik De Bruin
Abstract In submerged arc welding (SAW) of chromium (Cr) containing steels, Cr is usually added to the weld metal from the weld wire, and not from the welding flux. Manufacturing of weld wires of specific compositions is expensive and time consuming and cannot closely match all the desired alloy compositions. Therefore, the weld wire chemistry is usually over matched to the base plate composition.
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The effect of liquid crystalline graphene oxide compared with non-liquid crystalline graphene oxide on the rheological properties of polyacrylonitrile solution High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Baihua Liu,Cong Wang,Yu Muhuo
Abstract In this article, polyacrylonitrile (PAN) and two kinds of graphene oxide (GO) with different structural properties are blended in dimethyl sulfoxide (DMSO) according to a certain ratio to prepare stable-spinning solution. One kind of GO is purchased, and we call it GO1. The other is a kind of self-made GO with liquid crystal property in solution, which is called GO2. The effects of two kinds
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Solidification microstructure characteristics of Cu–Pb alloy by ECP treatment High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Teng Ma,Xiaosi Sun,Yanan Ning,Weixin Hao
Abstract The effects of high-density electric current pulse (ECP) treatment on the solidification of Cu–37.4 wt% Pb monotectic alloy melt were investigated. Compared to the method of molten glass purification combined with cyclic superheating, ECP treatment created finer microstructures of Cu–Pb alloys, with more homogeneous distribution of the Pb phase in the matrix. This phenomenon can be explained
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Optimization of heat transfer and pressure drop of the channel flow with baffle High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Behzad Ghobadi,Farshad Kowsary,Farzad Veysi
Abstract In this article, the numerical analysis has been carried out to optimize heat transfer and pressure drop in the horizontal channel in the presence of a rectangular baffle and constant temperature in two-dimension. For this aim, the governing differential equation has been solved by computational fluid dynamics software. The Reynolds numbers are in the range of 2,000 < Re < 10,000 and the working
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Study on manganese volatilization behavior of Fe–Mn–C–Al twinning-induced plasticity steel High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Fang-jie Lan,Chang-ling Zhuang,Chang-rong Li,Jing-bo Chen,Guang-kai Yang,Han-jie Yao
Abstract In the smelting process of high manganese steel, the volatilization of manganese will be accompanied. In this article, the volatilization of manganese in high manganese steel was studied by simultaneous thermal analyzer. The results show that the volatilization rate of manganese in high manganese steel increases with increasing temperature and holding time. It is proved by experimental study
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Copper-based kesterite thin films for photoelectrochemical water splitting High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Shigeru Ikeda
Abstract Copper kesterite Cu2ZnSnS4 is a promising photoabsorber material for solar cells and photoelectrochemical (PEC) water splitting. In this article, we will first review the crystallographic/energetic structures of Cu2ZnSnS4 in view of its applications to sunlight conversion devices. Then, historical progress in photovoltaic properties of Cu2ZnSnS4-based solar cells is introduced. Finally, studies
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Quantitative analysis of microstructure and mechanical properties of Nb–V microalloyed high-strength seismic reinforcement with different Nb additions High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Sheng Huang,Changrong Li,Zhiying Li,Zeyun Zeng,Yongqiang Zhai,Jie Wang,Zhanlin Liu,Changling Zhuang
Abstract HRB500E seismic steel bars are mainly used in high-rise buildings near the seismic zone. The influence of different niobium contents (0–0.023%) on the microstructure and mechanical properties of HRB500E seismic reinforcement was studied. Results showed that the grain size of ferrite was between 3.6 and 8.3 μm when only V was added. Meanwhile, as the niobium content increases, the ferrite particles
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Dephosphorization behavior of reduced iron and the properties of high-P-containing slag High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Liwei Liu,Guofeng Li,Yanfeng Li,Libing Zhao
Abstract Reduced iron (1.74% P) is produced from oolitic hematite ore by coal-based reduction and magnetic separation. To realize the comprehensive utilization of Fe and P, the dephosphorization behavior of the reduced iron is investigated in the presence of CaO–SiO2–FeO–Al2O3 slag. The P content of the final iron and the P2O5 content of the high-P-containing slag are determined, and the phase composition
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Solution growth of chalcopyrite Cu(In1−x Ga x )Se2 single crystals for high open-circuit voltage photovoltaic device High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Akira Nagaoka,Yusuke Shigeeda,Kensuke Nishioka,Taizo Masuda,Kenji Yoshino
Abstract I–III–VI2 Chalcopyrite Cu(In1−x Ga x )Se2 (CIGS) has attracted attention as absorbing layer in photovoltaic (PV) device. In this study, we investigated the fundamental properties of CIGS single crystals, and fabricated single crystal-based PV device. CIGS single crystals without secondary phase were successfully grown by In-solvent traveling heater method (THM). The conversion of conduction
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Heat transfer behavior in ultrahigh-speed continuous casting mold High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Luping Zhang,Pengcheng Xiao,Zengxun Liu,Jingyi Zhou,Liguang Zhu
Abstract The growth rate of the shell thickness in the funnel mold for ultrahigh-speed continuous casting of steel has a significant effect on the shell surface quality. By using the node temperature inheritance algorithm, a three-dimensional transient thermal conductivity model of the liquid steel solidification inside the mold was established, and the effects of casting temperature and speed on the
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Jet characteristics of CO2–O2 mixed injection using a dual-parameter oxygen lance nozzle for different smelting periods High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Chao Feng,Rong Zhu,Guangsheng Wei,Jianfeng Dong,Kai Dong
Abstract The jet performance of an oxygen lance nozzle influences the smelting rhythm, smelting index, and energy consumption of a converter. Due to the complexity of the process of converter smelting, the changing temperature and gas composition in the converter significantly impact the jet characteristics of the oxygen lance nozzle in the smelting process; however, research on the change law of jet
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Research on high-temperature mechanical properties of wellhead and downhole tool steel in offshore multi-round thermal recovery High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Binqi Zhang,Shaodong Ju,Chuangang Liu,Yingwen Ma,Haiyan Chen,Li Fan
Abstract High-temperature tensile tests at 25, 150, 250, and 350°C were carried out on 30CrMo, 42CrMo, 1Cr13, and 304 steels. The changes in tensile strength, yield strength, elongation, and area reduction ratio with temperature were determined. By analyzing the fracture morphology and the relationship between strength and hardness, the influence of high-temperature mechanical properties on crack sensitivity
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Visualization of the damage evolution for Ti–3Al–2Mo–2Zr alloy during a uniaxial tensile process using a microvoids proliferation damage model High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Ying Tong,Jiang Zhao,Guo-zheng Quan
Abstract Understanding the damage evolution of alloys during a plastic deformation process is significant to the structural design of components and accident prevention. In order to visualize the damage evolution in the plastic deformation of Ti–3Al–2Mo–2Zr alloy, a series of uniaxial tensile experiments for this alloy were carried out under the strain rates of 0.1–10 s−1 at room temperature, and the
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Parametric investigation and optimization for CO2 laser cladding of AlFeCoCrNiCu powder on AISI 316 High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Jyoti Menghani,Akash Vyas,Satish More,Christ Paul,Amar Patnaik
Abstract The purpose of the current investigation is to analyze the effect of the operating parameters of laser-assisted cladding process on clad height, clad depth, clad width and the percentage dilution in a cladding of AlFeCuCrCoNi high-entropy powder on SS-316 through CO2 laser and to optimize the cladding process parameters for optimum dilution. The experiments were designed by the full factorial
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Luminescence properties of Eu2+ and Sm3+ co-doped in KBaPO4 High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Yingwei Xu,Tingting Zhang,Li Zheng,Ailing Zou
Abstract KBaPO4:Eu2+/Sm3+ phosphor was synthesized via the high-temperature solid-phase reaction method. The structural properties, surface morphology, and optical properties of the synthesized samples were obtained by the X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and fluorescence measurements. The XRD patterns indicate that the crystal structure of KBaPO4 has not been changed
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The new concept of thermal barrier coatings with Pt + Pd/Zr/Hf-modified aluminide bond coat and ceramic layer formed by PS-PVD method High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Marek Góral,Maciej Pytel,Tadeusz Kubaszek,Marcin Drajewicz,Wojciech Simka,Łukasz Nieużyła
Abstract Thermal barrier coatings (TBCs) are widely used for protection of gas turbine parts from high temperature and corrosion. In the present study, the new concept of TBCs with three-element-modified aluminide coatings was presented. In the first stage, the Pt and Pd were electroplated on MAR M247 nickel superalloy. In the next stage, the low-activity CVD aluminizing process with Zr or Hf doping
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The differential analysis for temperature distribution diagnostics of arc current-carrying region in sheet slanting tungsten electrode inert gas welding with the electrostatic probe High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Yuanbo Li,Tao Ye,Wenxing Zheng,Shuaichuan Ma,Xilong Zhao
Abstract An electrostatic probe differential analysis method is used to diagnose the arc current-carrying region of the sheet slanting tungsten electrode. Based on the local thermal equilibrium condition and energy transition model with charged particles collision, the temperature distribution in the current-carrying region of different welding process parameters is solved by saturated ion current
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Effects of ball milling on powder particle boundaries and properties of ODS copper High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Pei Li,Cunguang Chen,Chenzeng Zhang,Na Xiao,Haifeng Zhang,Yang Li,Zhimeng Guo
Abstract Al2O3 dispersion-strengthened (ODS) copper has an excellent comprehensive performance due to the strong hindrance of the high concentration nano-Al2O3 to the dislocations inside copper grains. However, the processability of ODS copper is seriously deteriorated, which is caused by the presence of unfavorable microlevel Al2O3 particles along powder particle boundaries. In this study, a strategy
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Physical modeling of bubble behaviors in molten steel under high pressure High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Xiaojie Cui,Yuekai Xue,Dingguo Zhao,Shuhuan Wang,Fujian Guo
Abstract A water model was adopted to conduct an experimental study on the physical modeling of bubble behaviors and the effects of vessel pressure intensity, nozzle aperture diameter, bottom blowing location and bottom blowing flow rate on bubble properties were analyzed. Experimental results show that with the increase in vessel pressure intensity, the bubble breaking distance is shortened, the size
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Research on high-temperature oxidation resistance, hot forming ability, and microstructure of Al–Si–Cu coating for 22MnB5 steel High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Ziliu Xiong,Zhangguo Lin,Jianjun Qi,Li Sun,Guangxin Wu,Shuang Kuang,Guoping Zhou
Abstract High-temperature oxidation resistance, hot formability, element distribution, and microstructure of Al-10% Si-(0.5–3.0%)Cu coating were investigated by means of glow discharge spectroscopy, optical microscope, scanning electron microscope, and energy-dispersive spectroscopy. Results show that the addition of Cu can increase high-temperature oxidation resistance above 950°C and improve hot
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Effects of composition and strain rate on hot ductility of Cr–Mo-alloy steel in the two-phase region High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Yaxu Zheng, Wei Shen, Liguang Zhu, Zhihong Guo, Qi Wang, Jie Feng, Yongliang Li, Ruifang Cao, Jiayi Wu
The hot tensile tests were conducted in this study to investigate the effects of Nb, B, Mo, and V on hot ductility of 25CrMo alloy steel in a temperature range of 650–850°C with strain rates of 0.005 and 0.5 s −1 . Besides, the influences of ferrite transformation and precipitates on hot ductility were also investigated by the use of SEM and TEM. Thermo-Calc and J Mat Pro were used for calculating
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Dephosphorization mechanism and phase change in the reduction of converter slag High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Yuekai Xue, Peng Tian, Chenxiao Li, Chaogang Zhou, Dingguo Zhao, Shuhuan Wang
In the steelmaking process, the remained converter slag with P-containing materials is harmful to the molten steel in the next furnace. By the slag-splashing process with air blowing, P in the molten slag can be reduced and separated from the slag in the form of gas. In this paper, the reduction experiments of converter slag were carried out by flowing N 2 at high temperatures, and the P-containing
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Effect of K and Na on reduction swelling performance of oxidized roasted briquettes High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Wei Song, Guo-Ping Luo, Chen-Chen Sun, Jing Zhang, Jian-Guo Zhu
The presence of potassium oxide (K 2 O) and sodium oxide (Na 2 O) causes high reduction swelling of pellets of Bayan Obo iron concentrate during reduction and thus affects the permeability of blast gases during blast furnace operations. The influencing mechanism of K 2 O and Na 2 O on the swelling behavior of reduction reactions (1) Fe 2 O 3 → Fe 3 O 4 , (2) Fe 3 O 4 → Fe x O, and (3) Fe x O → Fe was
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Effect of Cr and Al alloying on the oxidation resistance of a Ti5Si3-incorporated MoSiBTiC alloy High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Xi Nan, Tomotaka Hatakeyama, Shuntaro Ida, Nobuaki Sekido, Kyosuke Yoshimi
The effects of adding Cr and Al on the oxidation behavior of a Ti 5 Si 3 -incorporated MoSiBTiC alloy (46Mo–28Ti–14Si–6C–6B, at%) were investigated at 800 and 1,100°C. The addition of Cr and Al largely improved the oxidation resistance of the MoSiBTiC alloy at 800°C due to the formation of Cr 2 (MoO 4 ) 3 and Al 2 (MoO 4 ) 3 in the oxide scales. These protective molybdates mainly formed on the molybdenum
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Microstructure and mechanical properties of 2060 Al–Li alloy welded by alternating current cold metal transfer with high-frequency pulse current High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Liwei Wang, Huan Hu, Huan Yan, Ying Liu, Ziqin Wu, Balaji Narayanaswamy, Zhimin Liang, Dianlong Wang
Al–Li alloy has been widely used in the aerospace field owing to its high strength and low density. In this study, alternating current cold metal transfer (AC CMT) along with a high-frequency pulse current technique was used to weld a 2060 Al–Li alloy using an ER5356 wire. The effect of pulse frequency on the arc shape, microstructure, and mechanical properties of the welded joints was examined, and
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Effect of basicity on the reduction swelling properties of iron ore briquettes High Temp. Mater. Process. (IF 1.5) Pub Date : 2021-01-01 Guo-Cheng Zhang, Guo-Ping Luo, Peng-Fei Jia, Yi-Ci Wang, Yi-Fan Chai
The influence mechanism of basicity on the reduction swelling index (RSI) of iron ore briquettes was investigated using the SEM analysis and Factsage 7.3 thermodynamic calculations based on the addition of pure CaO to Bayan Obo iron concentrate. The results revealed that the solid solution of Ca 2+ in the FeO lattice increased with the basicity of the briquettes, whereas the diffusion channels of Fe