
显示样式: 排序: IF: - GO 导出
-
A review of end-point carbon prediction for BOF steelmaking process High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-12-28 Zhou Wang; Qing Liu; Haitao Liu; Shizhong Wei
The precise prediction of end-point carbon content in liquid steel plays a critical role in increasing productivity as well as energy efficiency that can be achieved in the basic oxygen furnace (BOF) steelmaking process. Due to numerous and diversity of the studies on BOF end-point carbon prediction, it seems necessary to provide a comprehensive literature review on state-of-the-art developments in
-
Friction stir lap welding thin aluminum alloy sheets High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-12-23 Tao Wang; Xue Gong; Shude Ji; Gang Xue; Zan Lv
In this work, thin aluminum alloy sheets with thickness of 0.8 mm were friction stir lap welded using small shoulder plunge depths of 0 and 0.1 mm. The joint formation, microstructure and mechanical properties were investigated. Results show that voids appear inside the stir zone when the small plunge depth of 0 mm is used because the tool shoulder cannot exert a good material-collecting effect at
-
The local structure around Ge atoms in Ge-doped magnetite thin films High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-12-08 Kozo Shinoda; Seishi Abe; Kazumasa Sugiyama; Yoshio Waseda
Distribution of Ge atoms between tetrahedral and octahedral sites in the spinel-type structure of Fe2.64Ge0.36O4 thin films fabricated by radio frequency sputtering with a composite target of magnetite and Ge has been investigated by extended X-ray absorption fine structure analysis. The local structural changes around the Ge atoms in the films induced by annealing at 573 and 873 K are discussed through
-
Effect of Nb addition on the solidification structure of Fe–Mn–C–Al twin-induced plasticity steel High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-12-06 Wen-Hui Du; Chang-Rong Li; Chang-Ling Zhuang
The solidification microstructure of an Fe–Mn–C–Al high-Mn steel with added Nb was studied by optical microscopy and scanning electron microscopy. The results showed that the size of the columnar and equiaxed grains in the solidified structure of the high-Mn steel without added Nb was large. When Nb was added, the size of the equiaxed and columnar grains in the solidification structure of the high-Mn
-
Numerical simulation of nickel-based alloys’ welding transient stress using various cooling techniques High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-12-05 Meng He; Jianing Qi; Zhentai Zheng; Fen Shi; Yunfeng Lei
Nickel-based alloys play an important role in the field of high-temperature alloys, which are widely used in nuclear reactors, aerospace and components of turbomachinery. However, the high susceptibility of welding hot crack is a main shortcoming to nickel-based alloys. One of the methods that reduce hot cracking susceptibility is by adjusting element constitution of weld metal and another method is
-
Effects of rotational speed on the Al0.3CoCrCu0.3FeNi high-entropy alloy by friction stir welding High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-24 Po-Ting Lin; Chan-Sheng Wu; Chun-Hao Peng; Che-Wei Tsai; Yutaka S. Sato
Welding and relevant studies are indispensable to employ high-entropy alloys for practical applications. In this study, Al0.3CoCrCu0.3FeNi high-entropy alloy with single FCC phase was used to make “bead-on-plate” friction stir welds at different rotational speeds, and the effects on microstructure and mechanical properties were studied. Several banded structures containing oxide or nitride particles
-
Microstructure of metatitanic acid and its transformation to rutile titanium dioxide High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-30 Xiaoping Wu; Yong Liu
The microstructure of metatitanic acid and its transformations to titanium dioxide during calcination have been investigated previously. However, the detailed microstructure of metatitanic acid has not been elucidated. Herein, we report the high-resolution scanning electron microscopy and X-ray powder diffraction determinations of the microstructure of metatitanic acid and its transformation to titanium
-
Morphology evolution and quantitative analysis of β-MoO3 and α-MoO3 High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-30 Lu Wang; Meng-Chao Li; Guo-Hua Zhang; Zheng-Liang Xue
The morphology evolution from monoclinic molybdenum trioxide (β-MoO3) to orthorhombic molybdenum trioxide (α-MoO3) and quantitative analyses of their mixtures were examined. It was found that the morphology (from spherical to elliptical shape) and color (from green to white) displayed obvious changes when β-MoO3 converted to α-MoO3 in ambient air at 773 K. The transformation from β-MoO3 to α-MoO3 resulted
-
Damage accumulation and lifetime prediction of fiber-reinforced ceramic-matrix composites under thermomechanical fatigue loading High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-30 Longbiao Li
In this paper, the damage accumulation and life prediction in fiber-reinforced ceramic-matrix composites (CMCs) subjected to thermomechanical fatigue (TMF) loading are investigated. The relationships between TMF damage mechanisms, fatigue hysteresis-based damage parameters, fraction of broken fiber, and applied cycles are established. Evolution of fatigue hysteresis dissipated energy, fatigue hysteresis
-
Study on the erosion of Mo/ZrO2 alloys in glass melting process High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-18 Cui Chaopeng; Zhu Xiangwei; Li Qiang; Zhang Min; Zhu Guangping
The Mo/ZrO2 electrode was prepared by combining hydrothermal synthesis with powder metallurgy, and this new electrode material has a totally different microstructure from the conventional electrode. The grain size of the new electrode was fine, and the size of ZrO2 in the alloy reached 200 nm. According to the results, the Mo–ZrO2 electrode has better performance, because the erosion occurs along the
-
Effects of quenching and partitioning (Q&P) technology on microstructure and mechanical properties of VC particulate reinforced wear-resistant alloy High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-09 Bo Zhang; Song-Sheng Zeng
To improve the wear resistance, toughness, and hardness of alloy, the quenching and partitioning (Q&P) technology was applied in the VC particulate (VCp) reinforced wear-resistant alloys, which were prepared by adding different Mn contents (2–5 wt%). The effects of partitioning time on the distribution of alloying elements shown by EDX mapping, retained austenite fraction, microstructure, macro-hardness
-
The investigation on the middle period dephosphorization in 70t converter High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-09 Deng Nanyang; Wang Haijun; Ling Haitao; Wang Jianjun
An experimental test is carried out on the 70t converter in Masteel to study the law of middle period dephosphorization in the smelting period. It is found that the dephosphorization rate is slow in the early and middle period of smelting and the content of the final P in steel cannot reach the standard due to the low oxidation of slag. The content of the final P in steel can be controlled within 0
-
Effect of cerium on the initiation of pitting corrosion of 444-type heat-resistant ferritic stainless steel High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-09 Mingyu Ma; Houlong Liu; Liqing Chen
The 444-type heat-resistant ferritic stainless steel is widely utilized in automotive exhaust pipes and solid oxide fuel cells, due to its excellent properties at elevated temperature. To meet the demands of significantly harsh service environments, rare earths were added in 444-type ferritic stainless steel. For the purpose of evaluating the effect of rare earths on pitting corrosion initiation, the
-
Dephosphorization of hot metal using rare earth oxide-containing slags High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-11-02 Maolin Ye; Xiaojun Xi; Shufeng Yang; Jingshe Li; Feng Wang
An innovative rare earth oxide-containing slag for hot metal dephosphorization was proposed, and the factors influencing the efficiency during the dephosphorization of hot metal using rare earth oxide-containing slags were also studied. An increase in the temperature up to 1,550°C is beneficial to the dephosphorization process, and the maximum degree of dephosphorization for slags containing 6 wt%
-
Study on microstructure and mechanical properties of P92 steel after high-temperature long-term aging at 650°C High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-10-20 Peng Duan; Zongde Liu; Bin Li; Jiayao Li; Xiangqian Tao
A series of long-term high-temperature aging tests of ASME A335-P92 steel from 1,000 to 29,000 h at 650°C were carried out. The microstructure evolution of as-received and aging specimens at different stages was investigated using optical microscope observations, scanning electron microscope examinations, and TEM investigations. The static mechanical strength properties (yield strength/ultimate tensile
-
Optimization of heat treatment of glass-ceramics made from blast furnace slag High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-10-08 Yi-Ci Wang; Pei-Jun Liu; Guo-Ping Luo; Zhe Liu; Peng-Fei Cao
CaO–MgO–Al2O3–SiO2 glass-ceramics with diopside as the main crystalline phase were prepared by melting blast furnace slag obtained from Baotou Iron and Steel Company. The effect of heat treatment on the crystallization behavior of glass-ceramics, containing a large proportion of melted blast furnace slag, was studied by means of differential thermal analysis and scanning electron microscopy. The optimum
-
Kinetic analysis of CO2 gasification of biochar and anthracite based on integral isoconversional nonlinear method High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-10-02 Bing Dai; Jia-Yong Qiu; Shan Ren; Bu-Xin Su; Xiang Ding; Dian-Chun Ju; Ni Bai; Hong-Ming Long
The nonisothermal thermogravimetric analysis was implemented for gasification of sawdust char (SD-char), wheat straw char (WS-char), rice husk char (RH-char), bamboo char (BB-char) and anthracite coal (AC) in the presence of CO2. The dependence of activation energy upon conversion for different biochars and AC was obtained by the integral isoconversional nonlinear (NL-INT) method which is a model-free
-
Effect of adding yttrium on precipitation behaviors of inclusions in E690 ultra high strength offshore platform steel High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-10-02 Xiaojun Xi; Shaoying Li; Shufeng Yang; Jingshe Li; Mengjing Zhao
The mechanism of inclusions precipitation of the E690 offshore platform steel, with and without addition of yttrium, was studied using the thermodynamic calculation method. The results show that in the E690 steel in the absence of yttrium, the MnS inclusions were precipitated in the liquid phase at the solidification front. By adding the yttrium, MnS inclusions were replaced by spindle and spherical
-
Effects of solution and aging treatment parameters on the microstructure evolution of Ti–10V–2Fe–3Al alloy High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-24 Wan-Liang Zhang; Wen-Tao Hao; Wei Xiong; Guo-Zheng Quan; Jiang Zhao; Rui-Ju Shi; Qiao Liu
The solution-aging treatment parameters, including solution temperature, cooling rate and aging temperature, have significant influences on the microstructures and comprehensive mechanical properties of titanium alloy. In this work, the detailed microevolution behaviors of Ti–10V–2Fe–3Al alloy under different solution and aging conditions have been investigated through a series of heat-treatment experiments
-
The effect of M (M = Ce, Zr, Ce–Zr) on rolling microstructure and mechanical properties of FH40 High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-17 Meng Xianghai; Li Mengxing; Wang Meng; Wang Zhe; Li Yungang
Ce, Zr and Ce–Zr composite experimentl steel were prepared by vacuum induction furnace and 550 twin-roll reversible rolling mill. Optical microscope (OM), scanning electronic microscopy (SEM) and energy dispersive spectrometer (EDS) were used to observe the rolling microstructure of the experimental steel. The mechanical properties of the experimental steel were tested and analyzed. The effect of cerium
-
A downscaling cold model for solid flow behaviour in a top gas recycling-oxygen blast furnace High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-17 Zhenlong An; Jingbin Wang; Yanjun Liu; Yingli Liu; Xuefeng She; Jingsong Wang; Qingguo Xue
The top gas recycling-oxygen blast furnace (TGR-OBF) is a reasonable method used to reduce both coke rate and energy consumption in the steel industry. An important feature of this process is shaft gas injection. This article presents an experimental study on the gas–solid flow characteristics in a TGR-OBF using a two-dimensional cold model. The experimental conditions and parameters were determined
-
Assessment of impact mechanical behaviors of rock-like materials heated at 1,000°C High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-18 Shi Liu; Jinyu Xu; Xinyu Fang
Rock acts as a natural brittle material and demonstrates reactions to various dynamic disturbances and high temperature. Mechanical property fluctuations under high temperature and dynamic load for rock materials including marble, sandstone and granite are studied in an underground project of Qinling Mountain in China, exposed to 1,000°C treatments and different strain rate impact loadings. Two main
-
Phase evolution and oxidation characteristics of the Nd–Fe–B and Ce–Fe–B magnet scrap powder during the roasting process High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-18 Wenbin Xin; Yongchun Deng; Yinju Jiang; Ye Yuan; Pengyu Wang
Many developed techniques for rare-earths’ (REs) recovery from magnet scraps are highly sensitive to the oxidative roasting process of scraps under high temperature. This study focused on phase evolution, microstructural changes and element distribution during the roasting of the widely used Nd–Fe–B and high-potential Ce–Fe–B scrap powders at 800°C. The sustained oxidation of Fe to Fe2O3 and the constant
-
Microstructure evolution of TC4 powder by spark plasma sintering after hot deformation High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-10 Jiangpeng Yan; Zhimin Zhang; Jian Xu; Yaojin Wu; Xi Zhao; Yong Xue; Haijun Liu
The cylindrical samples of TC4 titanium alloy prepared by spark plasma sintering (SPS) were compressed with hot deformation of 70% on the thermosimulation machine of Gleeble-1500. The temperature of the processes ranged from 850°C to 1,050°C, and the strain rates varied between 0.001 and 5 s−1. The relative density of the sintered and compressed samples was measured by the Archimedes principle. During
-
Development and experimental research of a low-thermal asphalt material for grouting leakage blocking High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-10 Ping Fu; Liwei Huang; Zhanqing Xing
Tunnel water burst is among the common severe geological hazards in deep buried tunnel projects in China and throughout the world. Asphalt grouting is an effective method to block seepage channels in macroporous strata under the condition of flowing water, but it has defects such as a high heating temperature, complex high-temperature construction technology, and poor controllability during the grouting
-
Kinetics of iron removal from quartz under ultrasound-assisted leaching High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-07 Chang-Qiao Yang; Su-Qin Li
Kinetics of iron removal from quartz under the ultrasound-assisted leaching was explored in this paper, and the effects of temperature, leaching time, stirring speed and ultrasonic input power on iron removal were studied. The results revealed that the reaction kinetics followed the shrinking core model and the product layer internal diffusion was the rate-determining step in the ultrasound-assisted
-
Evolution of nonmetallic inclusions in pipeline steel during LF and VD refining process High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-10 Hangyu Zhu; Jixuan Zhao; Jianli Li; Qian Hu; Chenxi Peng
The formation and evolution of nonmetallic inclusions in pipeline steel were investigated by SEM, EDS and INCA Feature Analysis System, with the industrial process of electric arc furnace → ladle furnace (LF) refining → vacuum degassing → continuous casting. The composition, size and amount of inclusions during refining process were discussed systematically. The results show that inclusions at each
-
Influence of polyvinyl alcohol–glutaraldehyde on properties of thermal insulation pipe from blast furnace slag fiber High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-10 Baochen Han; PeiPei Du; Yuzhu Zhang; Hongwei Xing; Guangsheng Wei; Haiyang Wang
The development of an environmentally friendly binder can immensely benefit and promote the BF slag fiber industry. Accordingly, in this study, fiber insulation pipes were prepared using water glass, polyvinyl alcohol (PVA), and PVA–glutaraldehyde (GA); moreover, their bulk density, moisture absorption capacity, and thermal conductivity coefficient were measured and compared. The results demonstrated
-
Oxidizability characterization of slag system on the thermodynamic model of superalloy desulfurization High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-09-10 Wanming Li; Yulei Sun; Shaopeng Wu; Ximin Zang
The oxidizability characterization method of slag system has a decisive influence on the accuracy of the desulfurization model. By carrying out the balance experiments of melting system composed of CaF2–CaO–Al2O3–SiO2–TiO2–MgO–FeO slag system and Inconel 718 superalloy, the influence of Al2O3 and FeO on desulfurization distribution ratio at 1,773 K was studied. Based on the ion and molecule coexistence
-
Effect of radiative heat loss on thermal diffusivity evaluated using normalized logarithmic method in laser flash technique High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-08-21 Tsuyoshi Nishi; Naoyoshi Azuma; Hiromichi Ohta
The laser flash technique is a standard method to measure the thermal diffusivity of solid samples especially at high temperatures. To understand the reliability of thermal diffusivity evaluation at high temperature for solid samples with low-thermal-diffusivity values, we analyzed the effect of radiative heat loss using the logarithmic method. The results revealed that when the Biot number was 0.1
-
Effect of hydrothermal coupling on energy evolution, damage, and microscopic characteristics of sandstone High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-08-20 Zhang Rongrong; Ma Qinyong; Ping Qi; Ma Dongdong
Heat–cool (H–C) cycle is a serious natural weathering mechanism for rock engineering in temperate desert climate; meanwhile, engineering rocks usually involve responses to impact loads arising from blasting operation, mechanized construction, and seismic oscillation. Considering the universality and destructiveness of rock failure caused by H–C cycle weathering coupled with dynamic loading, split Hopkinson
-
Electric discharge method of synthesis of carbon and metal–carbon nanomaterials High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-08-10 Natalya Ivanivna Kuskova; Olha Mykolaivna Syzonenko; Andrii Serhiyovuch Torpakov
The current state and prospective of electric discharge methods of synthesis of carbon and metal–carbon nanomaterials (CNMs) in different areas of science, technology and industry are considered in the present paper. It was shown that as a result of electric discharge treatment of liquid hydrocarbons, the productivity of CNMs (namely, onion-like carbon, carbon nanotubes, carbon nanofibers and carbon
-
Effect of high-frequency electromagnetic field on microstructure of mold flux High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-08-07 Xingjuan Wang; Hebin Jin; Liguang Zhu; Ran Liu; Tushun Song
Soft-contact of molten steel can be achieved by applying a high-frequency electromagnetic field above the mold of continuous casting, which can effectively eliminate surface defects and achieve billets with no cracks and no oscillation marks. It also has some influence on the mold flux. In this study, the effect of a high-frequency electromagnetic field (20 kHz) on a mold flux flow field was simulated
-
Determination of chromium valence state in the CaO–SiO2–FeO–MgO–CrOx system by X-ray photoelectron spectroscopy High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-29 Deman Liu; Jiang Diao; Yiyu Qiu; Guang Wang; Gang Li; Bing Xie
The chromium valence states in the CaO–SiO2–FeO–MgO–CrOx system were investigated by X-ray photoelectron spectroscopy (XPS). The results indicated that the XPS peaks of Cr 2p3/2 and Cr 2p1/2 locate at the binding energy of ∼577 and ∼586 eV, respectively. There are three kinds of chromium ions such as bivalent Cr(ii), trivalent Cr(iii), and hexavalent Cr(vi) in the CaO–SiO2–FeO–MgO–CrOx slag. Cr(iii)
-
Corrosion behaviors of 316 stainless steel and Inconel 625 alloy in chloride molten salts for solar energy storage High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-29 Mingjing Wang; Song Zeng; Huihui Zhang; Ming Zhu; Chengxin Lei; Boshuai Li
Corrosion behaviors of 316 stainless steel (316 ss) and Inconel 625 alloy in molten NaCl–KCl–ZnCl2 at 700°C and 900°C were investigated by immersion tests and electrochemical methods, including potentiodynamic polarization and electrochemical impedance spectroscopy. X-ray diffraction and scanning electron microscopy/energy dispersive spectroscopy were used to analyze the phases and microstructures
-
Dynamic continuous cooling transformation, microstructure and mechanical properties of medium-carbon carbide-free bainitic steel High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-18 Xi Chen; Fuming Wang; Changrong Li; Jing Zhang
The effects of the cooling rate after hot deformation on phase transformation, the microstructure of the designed nonquenched and tempered medium-carbon carbide-free bainitic steel have been investigated during the dynamic continuous cooling process. The results show that with the increase of the cooling rate, the morphology of the carbide-free bainite of the experimental steel evolves from granular
-
Effect of multi-pass deformation on microstructure evolution of spark plasma sintered TC4 titanium alloy High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-21 Jiangpeng Yan; Yong Xue; Zhimin Zhang; Yaojin Wu; Xi Zhao
The TC4 titanium alloy powder test piece was prepared by spark plasma sintering. The multi-pass hot deformation of the TC4 titanium alloy was tested by using the Gleeble-1500 experiment machine. Measurement of relative density, X-ray diffraction, optical microscopy, scanning electron microscopy and electron backscatter diffraction were carried out for the TC4 titanium alloy. In order to reveal the
-
Influence of electrode tip diameter on metallurgical and mechanical aspects of spot welded duplex stainless steel High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-21 Vivek D. Kalyankar; Gautam P. Chudasama
In this article, the influence of electrode tip diameter is investigated for spot welded duplex stainless steel (DSS). Electrode tip diameter and welding current are considered as the major influencing parameters and their values are varied within the feasible range, suitable for 0.8 mm thick sheet, whereas other important parameters such as welding time and electrode force are kept constant. DSS with
-
Improvement of toughness and hardness in BR1500HS steel by ultrafine martensite High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-13 Li-Yong Wang; Le Li
To obtain the ultrafine martensite for BR1500HS ultra-high-strength steel, a new preparation process of cyclic heat treatment (CHT) with descending heat temperature and holding time along with cycle steps was developed. First, a series of thermal dilation tests were conducted with the temperature range of 420–730°C and the heat rate of 5 K/s on a Gleeble-3800 thermomechanical physical simulator. According
-
An interpretation on the thermodynamic properties of liquid Pb–Te alloys High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-15 Toru Akasofu; Masanobu Kusakabe; Shigeru Tamaki
The bonding character of liquid lead telluride PbTe is thermodynamically investigated in detail. Its possibility as an ionic melt composed of cation Pb2+ and anion Te2− is not acceptable, by comparing the ionization energy of Pb atom, electron affinity of Te atom and the ionic bonding energy due to the cation Pb2+ and anion Te2− with the help of structural information. Solid lead telluride PbTe as
-
Microstructure evolution of roll core during the preparation of composite roll by electroslag remelting cladding technology High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-09 Yulong Cao; Guangqiang Li; Zhouhua Jiang; Yanwu Dong; Zhengrong Zhao; Chenrui Niu
In the present study, the comprehensive analyses based on the numerical simulation, in situ observation, and metallographic detection were carried out for the roll core of GCr15/45 carbon steel composite roll manufactured by the new electroslag remelting cladding (ESRC) method. During the ESRC process, the temperature distributions at the different radial and longitudinal positions of the roll core
-
Influence mechanism of pulse frequency on the corrosion resistance of Cu–Zn binary alloy High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-11 Zuofu Zhao; Xin Li; Liang Liu; Minghua Chen; Xiaobo Ma; Jingang Qi; Bing Wang
In this work, the influence of pulse frequency on the corrosion resistance of Cu–Zn binary alloy has been investigated by using electrochemical workstation, scanning electron microscope and X-ray diffraction. The results have shown that after the electric pulse treatment, the average grain size in the microstructure of high-zinc binary brass decreased and the corrosion resistance increased. The thickness
-
Structural evidence of complex formation in liquid Pb–Te alloys High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-09 Toru Akasofu; Masanobu Kusakabe; Shin’ichi Takeda; Shigeru Tamaki
The former analysis of the structural data in liquid Pb–Te alloys, based on the neutron diffraction measurements for this system, was insufficient to obtain the microscopic and spatial configurations in this system. In order to obtain these configurations, we have newly analyzed by using the Reverse Monte Carlo simulations and the method of Voronoi polyhedron. The partial structure factors Sij(Q) and
-
Sulphur and vanadium-induced high-temperature corrosion behaviour of different regions of SMAW weldment in ASTM SA 210 GrA1 boiler tube steel High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-07-01 Ravindra Kumar; Vinay Kumar Tewari; Satya Prakash
Corrosion at elevated temperature is a serious problem in running thermal power plants because of the use of low-grade fuels that contain substantial amounts of sulphur, vanadium, sodium etc. This article reports the high-temperature corrosion of weld metal and heat-affected zone (HAZ) of shielded metal arc-welding (SMAW) weldment in GrA1 steel in a molten salt (Na2SO4–60% V2O5) environment at 900°C
-
The effects of β-Si3N4 on the formation and oxidation of β-SiAlON High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-30 Xin Liu; Dianli Qu; Xudong Luo; Yuxiang Guo; Yan Cui
The influence of the additive β-Si3N4 on the formation and oxidation of Si4Al2O2N6 during the sintering of Al, Si, and Al2O3 powders under flowing nitrogen atmosphere was examined. An increasing molar percentage of β-Si3N4 was shown to alter the morphology of Si4Al2O2N6 from a fiber-like to a rod-like structure and also shortened the time needed to form a dense, continuous oxide layer, which served
-
Influence of Al deoxidation on the formation of acicular ferrite in steel containing La High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-30 Yu-Min Xie; Ming-Ming Song; Fang-Fang Wang; Zheng-Liang Xue; Run-Sheng Xu; Wei Wang
The formation of acicular ferrite (AF) in steel containing Lanthanum (La) with different contents of Aluminum (Al) has been investigated. It has been found that the amount of AF in La treated steel killed by Al is less than the one with little content of Al. The reasons are as follows: first, Al can change the type of La-containing inclusions and may reduce the effectiveness of La inclusion to induce
-
Influence of processing parameters on slab stickers during continuous casting High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-30 Yu Liu; Yuanpeng Tian; Xudong Wang; Yali Gao
In this study, the parameters of 44 sticker breakout samples were analysed. The research mainly focused on the steel grades and slab thickness of stickers. Other processing parameters, such as slab width, casting speed, mould fluctuation, heat flux and operation, were also discussed. The results show that the number of stickers of low carbon steel and low alloy steel was 16 and 28, respectively. The
-
Effect of 2CaO·SiO2 particles addition on dephosphorization behavior High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-30 Aijun Deng; Yunjin Xia; Jie Li; Dingdong Fan
The effect of the addition of 2CaO·SiO2 solid particles on dephosphorization behavior in carbon-saturated hot metal was investigated. The research results showed that the addition of 2CaO·SiO2 particles have little influence on desilication and demanganization, and the removal of [Si] and [Mn] occurred in the first 5 min with different conditions where the contents of 2CaO·SiO2 particles addition for
-
Temperature-dependent proportional limit stress of SiC/SiC fiber-reinforced ceramic-matrix composites High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-22 Longbiao Li
In this paper, the temperature-dependent proportional limit stress (PLS) of SiC/SiC fiber-reinforced ceramic-matrix composites (CMCs) is investigated using the micromechanical approach. The PLS of SiC/SiC is predicted using an energy balance approach considering the effect of environment temperature. The relation between the environment temperature, PLS, and composite damage state is established. The
-
Improving mechanical properties of ZK60 magnesium alloy by cryogenic treatment before hot extrusion High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-16 Tao Lin; Ji-Xue Zhou; Cai-Nian Jing; Yun-Teng Liu; Lin-Lin Zhang; Xiang-Bin Meng
Few studies of cryogenic treatment were focused on nonferrous alloys, such as magnesium alloy. In this work, the effect of cryogenic treatment (77 K) before extrusion on microstructure and mechanical properties of ZK60 alloy was investigated. The results showed that many fine G.P. zones were formed during the cryogenic treatment and then grew to short fine β1′ precipitates when heating before extrusion
-
Effect of temperature on matrix multicracking evolution of C/SiC fiber-reinforced ceramic-matrix composites High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-09 Longbiao Li
In this paper, the temperature-dependent matrix multicracking evolution of carbon-fiber-reinforced silicon carbide ceramic-matrix composites (C/SiC CMCs) is investigated. The temperature-dependent composite microstress field is obtained by combining the shear-lag model and temperature-dependent material properties and damage models. The critical matrix strain energy criterion assumes that the strain
-
Influence of normalizing and tempering temperatures on the creep properties of P92 steel High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-08 Lakshmiprasad Maddi; Atul Ramesh Ballal; Dilip Ramkrishna Peshwe; M. D. Mathew
P92 steel is used as a piping material in ultra super critical power plants that can be operated at steam temperatures up to 650°C. The changes in the martensitic microstructure of P92 steel must be evaluated thoroughly before it is put into actual service. In this study, indigenously developed P92 steel was used. The steel was subjected to normalizing and tempering heat treatments in the range of
-
Study on the structure activity relationship of the crystal MOF-5 synthesis, thermal stability and N2 adsorption property High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-06-06 Sheng Wang; Xianfei Xie; Wenke Xia; Jiaming Cui; Shengquan Zhang; Xueyan Du
The parallel flow drop solvothermal method was utilized to synthesize the crystal of MOF-5 by taking the molar ratio of the metal ions to the organic ligands of 2:1 at 140∘C, and the reaction time at 12 hours. Meanwhile, the structure and properties of MOF-5 were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA) and fourier transform
-
Laser pressure welding of Al-Li alloy 2198: effect of welding parameters on fusion zone characteristics associated with mechanical properties High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-05-27 Tianbo Zhao; Yutaka S. Sato; Rongshi Xiao; Ting Huang; Jingquan Zhang
Al-Li alloy 2198 exhibits good combination of toughness and strength but its application is strongly limited by the poor weldability due to the formation of porosities during fusion-welding. This is the first study proposing and verifying a new approach to produce defect-free laser welds of poorly fusion-weldable Al-Li alloy 2198 with applied external pressure, i.e., feasibility of laser pressure welding
-
Microstructure evolution and mechanical properties of Hastelloy X alloy produced by Selective Laser Melting High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-05-27 Sun Zhonggang; Ji Shuwei; Guo Yanhua; Lu Yichen; Chang Lili; Xing Fei
Selective laser melting (SLM) is considered as an important additive manufacturing (AM) technology which can fabricate parts with complex geometry. However, it is difficult to predict the optimal SLM-parameters of metallic materials. In this study, orthogonal experiments were designed to study the influence of SLM-process parameters on the density and fabricated quality of Hastelloy X superalloy. Moreover
-
Solidification pathways and phase equilibria in the Mo–Ti–C ternary system High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-05-20 Shuntaro Ida; Nobuaki Sekido; Kyosuke Yoshimi
The liquidus surface projection and isothermal section at 1,800°C in the Mo–Ti–C ternary system are examined using arc-melted alloys. A ternary transition peritectic reaction (L + Mo2C → Mo + TiC) takes place during solidification, which is apparently different from the ternary eutectic reaction (L → Mo + TiC + Mo2C) observed in a previous report. Since the composition of the eutectic reaction (L →
-
Effects of different deoxidization methods on high-temperature physical properties of high-strength low-alloy steels High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-05-20 Ke-lin Zhang; Kai-ming Wu; Oleg Isayev; Oleksandr Hress; Serhii Yershov; Vladimir Tsepelev; Cheng-yang Hu
This study was aimed at examining the effects of different deoxidization methods on the physical properties of metallic melts by measuring the changes in the kinematic viscosity, electrical resistivity, surface tension, and density of the metallurgical melts during the heating and cooling processes. Our results indicate that high-temperature physical properties are consistently affected by specific
-
Effect of substituting fine rutile of the flux with nano TiO2 on the improvement of mass transfer efficiency and the reduction of welding fumes in the stainless steel SMAW electrode High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-05-12 Vishnu B. Rajeswari; Sivapirakasam Suthangathan Paramashivan; Sreejith Mohan; Shaju K Albert; Rahul M
Journal Name: High Temperature Materials and Processes Volume: 39 Issue: 1 Pages: 117-123
-
Microstructural evolution during high-temperature tensile creep at 1,500°C of a MoSiBTiC alloy High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-04-29 Sojiro Uemura; Shiho Yamamoto Kamata; Kyosuke Yoshimi; Sadahiro Tsurekawa
Microstructural evolution in the TiC-reinforced Mo–Si–B-based alloy during tensile creep deformation at 1,500°C and 137 MPa was investigated via scanning electron microscope-backscattered electron diffraction (SEM-EBSD) observations. The creep curve of this alloy displayed no clear steady state but was dominated by the tertiary creep regime. The grain size of the Moss phase increased in the primary
-
Experimental validation of the reaction mechanism models of dechlorination and [Zn] reclaiming in the roasting steelmaking zinc-rich dust process High Temp. Mater. Process. (IF 0.677) Pub Date : 2020-04-04 Hongyang Wang; Kai Dong; Rong Zhu
The reaction mechanism models of dechlorination and [Zn] reclaiming in the roasting steelmaking zincrich dust process are studied. The dust collected from a steelwork contains 63.8% zinc and 3.18% chlorine (mass percent), of which, almost all zinc elements exist in ZnO and ZnCl2 forms, and all the chlorine elements are stored in ZnCl2. When the dust is roasted at above 732∘C in an air atmosphere, the