ABSTRACT This article discussed the impact of various nanofluids on the machinability aspects during hard turning of AISI 4340 alloy steel. The experiment was performed using minimum quantity lubrication (MQL) technique. The effect of various fluid properties like thermal conductivity, viscosity, surface tension and contact angle were analyzed for all nanofluids. Various samples of nanofluids were

ABSTRACT Machining of novel light weight 7075 aluminum alloy reinforced with thin-walled hollow ceramic bubbles present a significant challenge to the manufacturing industry. The presence of hollow bubble phase causes poor surface finish and high machining cost. In this paper, an effort has been made to elucidate the mechanics of machining new grade AA7075 syntactic foams through an analytical force

ABSTRACT Machining of high strength and shock-absorbent Metal Fiber Laminate (MFL) becomes inevitable to attain the geometric shape and size, as to validate the functionality in various impact protection environments. A class of titanium metal laminate alternatively interleaved with high strength basalt and shock absorbing flax fibers have been machined with an abrasive water jet method. Machining

ABSTRACT The nickel-base superalloys have significant usage in aviation, aerospace and other modern industries owing to its valuable engineering properties, which include good corrosion, creep resistance, high strength and elevated temperature resistance. However, its machinability faces extreme difficulty due to inherent characteristics. In this study, one such attempt has been made to enhance the

ABSTRACT Functionally graded material (FGM) are a composite material which consists of filler material and matrix. FGM properties vary along the composition gradient. Common FGMs employs one type of filler material with specific properties. The application of two types of filler materials makes an opportunity to achieve the advantages of two types of filler materials, simultaneously. This study focuses

ABSTRACT In the present research, an attempt was made to determine the suitable coated tool for drilling AA5052 nano hybrid sandwich sheet using Response Surface Methodology (RSM) and Taguchi method. The work aims at minimizing thrust force and torque on a friction drilling tool for drilling holes. Plasma Nitriding, Liquid Nitriding, and PVD Titanium Nitride (TiN) coating are applied on H13 steel tool

ABSTRACT Drawing dies have been playing a momentous role in the cold-forming industry for centuries, and nowadays the drawn products such as wires and tubes are adopted for a wide spectrum of applications. With the increased demand of productivity and quality of drawn products, which give higher requirements on the mechanical and tribological performance of the working surface of drawing dies, a variety

ABSTRACT Al-matrix composites specifically Al6061-7.5%SiC which holds promising mechanical properties, is a potential candidate in aeronautical industry. Though the reinforcement of SiC in Al-substrate has appreciably enhanced the mechanical characteristics, but it complicates its machining as the composite bears excellent hardness and strength. Moreover, its intended applications require the formation

ABSTRACT A noncontact machining process such as electrical discharge machining (EDM) is generally employed for machining electrically conductive materials irrespective of its hardness. However, the process becomes unstable and slow when deep features are to be machined. Furthermore, the standard dielectric-based EDM process is unable to meet the requirements of today’s fast moving manufacturing industry

ABSTRACT Given the non-biodegradable nature of plastic, its recycling and upcycling are critical to ensure effective waste management and resource conservation, with a cradle-to-cradle approach. Herewith, we report a low-effort and nature-friendly upcycling route for plastic waste to manufacture large quantities of graphene nanosheets (GNs) via a two-stage pyrolysis process. To analyze the utility

ABSTRACT Nowadays, finite element analysis is the best suitable approach to reduce the need for several experiments. This paper is based on the FE modeling and model validation via the experimental value of turning operation in 2D on heat-treated Titanium alloy (Ti-10-2-3 is also named as Ti-10 V-2Fe-3Al). Turning operation is treated as an orthogonal cutting process and this operation is simulated

ABSTRACT Generation of micron-scale structures on a substrate is an emerging area in the manufacturing sector owing to its application in different fields such as micro-lenses, micro-needles, micro-reactors, micro-pumps, etc. Specifically, a patterned polymer is a much-desired product having applications in optics, hydrophobicity, micro-fluidic chip, etc. Such structures can be fabricated through photolithography

ABSTRACT The alternative dielectrics like vegetable oils, emulsions, and different organic solutions have captured the emerging research attentions, and few pieces of literature also discussed about their potentiality to replace conventional kerosene. However, observations of the existing literatures are limited up to the assessment of the primary responses like material removal rate (MRR), surface

ABSTRACT The carbon nanofibers (Cnfs) dispersed SiC-Cnfs composite powder has been produced by spray freeze-granulation technique. SiC-based hybrid composite tubes (BN-Cf/SiC-Cnfs) were fabricated by systematically laying of boron nitride-coated continuous carbon fiber (BN-Cf) in the SiC-Cnfs composite matrix. High-density hybrid composite tubes were processed by cold isostatically pressing (CIP) of

ABSTRACT The deposition of steel powders on glass fiber reinforced polymer (GFRP) with the Cold Spray technique is investigated. Metallization of composite materials is still challenging when high-strength and dense powders, such as steel, are used due to excessive erosion of the polymer or disruption of the fibers during the deposition. To overcome these issues, low-pressure cold spray equipment has

ABSTRACT Electrolytic codeposition is a promising alternative low-cost process for fabricating MCrAlY coatings. In this process, CrAlY particles are codeposited with the (Ni,Co) to form an (Ni,Co)-CrAlY composite coating, which is subsequently heat treated at elevated temperatures to be transformed to the MCrAlY coating containing phases of β-NiAl, γ-(Ni,Co), etc. A permeable rotating barrel was utilized

ABSTRACT In this work, various reciprocating cycle times of 80, 160, 240, and 320 sec in the diamond wire sawing (DWS) process were adjusted to improve the slicing ability in solar industry. During the same slicing time, the long reciprocating cycle time had less velocity inverse points in comparison with the short reciprocating cycle time. Consequently, the total friction force of the slicing wires

ABSTRACT This work has described about the generation of complex shaped pattern using reverse electro discharge machining process. Powder metallurgical green compact tool has been used to generate a predefined pattern by depositing its constituent materials. A predefined star shaped pattern has been generated on the aluminum 6061 work surface. The pattern has been created by adjusting the process factors

ABSTRACT Metal cutting industries are facing problems like poor surface quality and high tool wear in dry turning of AISI 52100 steel. In the present study, Minimum Quantity Lubrication (MQL) cooling technique along with textured tools was investigated to address these problems in turning of AISI 52100 steel. In this work, textured tools performance was evaluated during turning of AISI 52100 steel

ABSTRACT Much research has focused on residual stress detection, analysis and elimination for alloy materials. There is however limited work considering residual stress in gray cast iron materials (HT200, 250, 300, 350) which are commonly used in heavy machine tool components. Herein an experimental program is undertaken to quantify the influence of typical machine tool production processes (casting

ABSTRACT Despite good creep and fatigue durability, high resistance against chemicals and good surface finish, Polyoxymethylene (POM) has been sidelined in incremental sheet forming (ISF) literature due to its low formability at room temperature. This paper addresses the issue by deploying a cost-effective friction-induced heat at the tool-sheet interface. This work demonstrates a combined experimental

ABSTRACT Friction Stir Processing (FSP) has become a leading technique to produce surface composite on the surface of various materials such as aluminum, magnesium, copper, steel, etc. FSP is used to improve the mechanical, tribological, corrosion, and other properties of the material by producing surface composite. Surface composites are suitable for various applications in industries like aerospace

Complex structures with a prescribed distribution of material often reach the limit of manufacturing technologies. Additive manufacturing has emerged as a valuable option to fabricate structured materials, i.e. cellular or lattice materials. Numerous works related to such materials have used additive manufacturing including extruder-based technologies and laser-based technologies, among others. Each

Ultra-high molecular weight polyethylene (UHMWPE) is a highly used polymer in the medical field due to its properties such as good mechanical strength, high hardness, good chemical resistance, and excellent biocompatibility. UHMWPE is used for the manufacturing of acetabular cups in hip-joint implantation. For enhancing the life span and functionality of hip implants, the uniform fine surface finish

The use of nickel aluminum bronze (NAB) is found in components that include landing gear bearings, cast valve bodies, and perforated orifice for pharmaceutical industries. Machining of the NAB alloy in the micro-domain is a great challenge because of its unique mechanical and chemical properties. This work investigates the suitability of electrode materials for anodic dissolution of the NAB alloy through

Electromagnetic punching is an efficient hole-machining process in order to satisfy structural or functional requirements. In this paper, the electromagnetic punching experiments were carried out to investigate hole-punching quality of carbon fiber reinforced plastic laminates with various punches. The quality evaluation such as macroscopic measurement, microstructure observation and delamination analysis

Carbon fiber reinforced composites (CFRP) have superior mechanical properties such as high strength/density ratio, and good damping ability. CFRP which is frequently used in parts in the aviation industry can also be single or stacked together with titanium and aluminum alloys. However, delamination could occur on the CFRP surfaces after drilling which leads to deterioration in mechanical properties

To minimize the surface roughness and delamination problems during the end milling of natural fiber reinforced composites (NFRCs), it is essential to understand the effects of the machining parameters (spindle speed and feed rate) and the kinematics of material removal. In this study, the effects of machining parameters on the machined surface quality – surface roughness (Ra) and delamination factor

In this work, facile pressureless sintering process is explored to manufacture the promising Cr2AlC MAX phase material, using three elemental powders as starting materials. The powders are mixed in a molar ratio of Cr:Al:C = 2:1.2:1, and ball-milled for particle refinement and homogenization. The powder mixture is sintered at differing temperatures from 1000 to 1400°C without applying pressure. Highly

This experimental study presents the development of a novel bio-composite with a process of utilization of waste chicken egg shells. The objective of work is to identify the effect of processing of coconut jute fiber, gelatin and chicken egg shells relating its influence on mechanical and micro structural properties bio-composite created. Cold powder processing was used to establish the effect of gelatin

In this paper, a novel AM series Mg alloy developed through a stir casting process has been discussed. The current research utilizes an improved stir casting setup with a systemized inert facility. The effects of the processing parameters viz. stirring speed and holding temperature on microstructure and mechanical properties of the novel AM alloy (Mg-7 wt%Al-0.9 wt%Mn) have been investigated during

In this paper the dependencies between face milling strategy of EN AW6082-T6 aluminum alloy samples, with difference thicknesses (6, 8, and 12 mm) and two cold rolling directions, and flatness deviations were presented. Three strategies of milling included different proportions of material removed from both sides of the plates. This approach allowed to control the proportions of residual surface stresses

(2020). Archaeometry of prehistoric and protohistoric stone, metal, ceramics and glass. Materials and Manufacturing Processes: Vol. 35, Special Issue on Archeometry, pp. 1401-1402.

This paper communicates new results on fire aided limnosilicte mining in a Hungarian paleolithic site. The beneficial effect of temperature on material fragmentation and chipping was proved by laboratory experiments, with samples fired at 260°C and 360°C. Mineralogical transformations which lead to fragmentation are triggered by heating and were characterized by analytical methods in detail. The raw

The SiO2 varieties of low temperature other than quartz play an important role in the composition of many archeological tools, products, byproducts, and raw materials. We have encountered several SiO2 species, ranging from Paleolithic stone tools to glass production, from ores, smelting slags, and finds of burnt clay belonging to ancient metalworking technologies. They are amorphous or nanocrystalline

A group of beads from the artificial cave of La Molina (Lora de Estepa, Sevilla) and Cova del Gegant (Sitges, Barcelona) were made from biogenic raw material and intentionally covered by a layer of resin. This is the first time this type of treatment has been documented on elements of adornment in the Late Prehistory of the Iberian Peninsula. The composition and nature of the coatings are analyzed

This paper is a research contribution about translucent beads, with special attention to fluorite mineral used by the communities of Iberian Late Prehistory. We review the use and social significance of translucent beads in this period. The starting point for this study is the chemical (Raman spectroscopy, p-XRF, XRD and VIS/NIR) and contextual analysis of an important number of adornments inventoried

Despite being one of the largest complexes at Teotihuacan, Plaza de las Columnas has been one of the least studied. Recent archaeological discoveries by the Project Plaza de las Columnas Complex revealed that its inhabitants maintained an evident relationship with the Mayan area. The methodology employed consisted first of a surface examination of the materials via imaging techniques. Afterward, mineralogical

The Jiroft civilization is one of the most interesting cultures in the Iranian region, with important archeological finds. The area is considered the homeland of a mysterious culture: Aratta. Jiroft/Aratta might be the homeland of Sumerian myths, which then traveled west to Mesopotamia. Ten pieces of Neolithic pottery dated to the 7th–6th Mill. BC, and eight samples from Bronze Age (early 3rd Mill

The aim of this paper is to present the results of XRF analysis of archeological samples in two different states of preservation: intact vessel surfaces and transformed into powder. To investigate the effect of sample processing for XRF analysis, a handheld spectrometer was used. In total, 41 pottery samples were measured. The samples were extracted from Late Bronze Age and Early Iron Age ceramic vessels

The archeological site RS-TQ-141 is located in Rio Grande do Sul (Brazil) and belongs to the pre-colonial Guarani Tradition (between fifth and seventeenth century). The site extends to the bank of the Taquari River. About 200 small fragments of ceramic from the site present internal and/or external coating surfaces. Archaeometry analyses were applied in order to understand coating application mechanism

In this paper we establish a baseline for the chemical and petrographic characterization of indigenous LBA/EIA funerary urns from south-western Iberia. In this we focus primarily on the morphological category of biconical vases, one of the most iconic vessel types known from Tartessian burial sites. In comparison to other types of ceramic urn vessels from archeological sites of the Orientalizing period

This paper presents the results of X-ray fluorescence analysis carried out in the last years on silver objects from three different Cretan Early Minoan cemeteries, Hagia Photia Siteias, Kephala Petras, and Livari Skiadi, dated to ca. 3000 to 2800 BC. The classes of objects discussed in this paper comprise mainly daggers and jewelry pieces; other kinds of items, however, can also be included as comparisons

The Author discusses the evidence of copper ore winning and smelting in Lombardy during the late Bronze/early Iron Ages and observes that far more copper ore reduction sites than copper deposits are known. Then, using Valsassina (Lecco) as an example shows that in an area in theory void of copper ores there are micro sources of copper ores, which could have interested prehistoric miners.

Metal artifacts, constituting hoards, were deliberately abandoned for various reasons. In order to study hoards, an interdisciplinary, mainly metallic, database was created as part of the DEPOMETAL research program, and work on elemental compositions of copper-based artifacts was carried out on a national scale. A statistical protocol allowing chronological and geographical clustering of artifacts

Numerous slag samples and a piece of iron bloom with slag from excavations of Celtic settlements (La Téne C and D) at Ordacsehi, Szilvásvárad and Jászberény (Hungary) were examined. The main objectives of the investigations were to study the material and structural properties of the slag specimens, the definition of the metallurgical functions of the different pieces of slag. Analytical techniques

In the context of the surface texture of the tool, turning process performance is sensitively affected by the surface texture geometry, design, and working environment. Therefore, present work focused on the fabrication of new texture design tools (an amalgamation of linear microgrooves and circular pit holes) and machinability evaluation of so developed tools in turning of AISI 304 material under

Wire electrical discharge machining (WEDM) is a specialized electrothermal machining process capable of producing complex shapes with close tolerances irrespective of material hardness. Zirconia (ZrO2) ceramic has higher fracture toughness and flexural strength which can be useful in a variety of applications, but the principle limiting factor is its electrical conductivity. Assisting electrode (AE)

This work contributes to the surface topographical study of miniature Ti-alloy coated samples prepared by the micro-electrical discharge coating process using powder mixed dielectric medium. Two phases of experiments were conducted, first phase: using tungsten disulfide mixed in de-ionized water and second phase: using molybdenum disulfide powders mixed in deionized water. The produced micro-parts

In this manuscript, Electrochemical Micromachining (ECM) is well designed with the important concept called scale effect. The main objective is to evaluate the scale effects that occur when the machining parameters is transferred from micro ECM to macro ECM. Similarity theory is used to evaluate the scale effects quantitatively. Input process parameters such as feed rate, duty ratio and voltage are

Thermal injuries inflicted during bone drilling significantly affect the success rate of surgery, hence, it is important to control thermal injury through temperature reduction. Low-frequency vibration-assisted drilling (LFVAD) is proposed here to reduce thermal injury to bones. Subsequently, the effectiveness of this process is experimentally verified. Based on the trajectories of the cutting edge

Cold spray deposition of aluminum powders on polyethylene reinforced with glass fibers has been studied. Different processing conditions, including different stratifications of the fiber-reinforced polymer used as a substrate, have been investigated to better understand the deposition mechanism. The experimental campaign has been conceived and tailored to highlight the influence of several process

Cutting tool texturing is considered beneficial during the machining process because it could act as lubricant reservoirs to supply extra lubricant and help to entrap the wear debris, which results in the reduction of friction and tool wear. However, due to the exorbitant cost associated with laser-based tool texturing and difficulty in generating precise texture geometry in micro-inserts using alternate

This article reviews advanced polishing, grinding and finishing processes for challenging manufacturing applications. The topics covered are machining of advanced alloys; machining of wafers; strengths of dies after machining; grinding and polishing for wafer level packages; hybrid finishing processes; magnetorheological finishing; cooling and lubrication; dental, implant and clinical applications;

In this paper, the thread turning of aluminum 7075 aerospace alloy is studied using microtextured carbide cutting inserts. The main target of this research work is to optimize the parameters of microtextured tools using response surface methodology (RSM) in the thread turning process. To achieve this, microtextures were fabricated by laser micromachining on the rake surface of tools. The factors studied

The recent paper proposes a hybrid micro-grinding process for ultra-precision meso/micro components of monocrystalline silicon manufacturing. The proposed technique utilizes the chemical modification solution to modify and soften the surface layer and then manufactures meso/micro-structures via micro-grinding. A special chemical solution with optimized formula was prepared, and a 0.31 mm diameter,

Uncertain process parameters present in industrial grinding circuits (IGC) increase the difficulty in modeling IGC. Conventionally, researchers have resorted to box approach for sampling in the uncertain parameter space, mimicking the uncertain parameter realizations, to observe their effects in objective functions and constraints. In case data are scattered in the uncertain parameter space, sampling

Today, the utilization of millisecond pulse laser drilling, despite the extensive applications in different fields, is accompanied by several limitations such as low penetration depth, high thickness of recast layer, and heat-affected zone. In order to overcome these limitations, different techniques such as applying magnetic field as well as utilizing ultrasonic vibrations have been proposed. Up to

Metal matrix composites (MMC’s) with their exceptional properties are gaining importance in many industries (i.e., automobile, structural, aerospace, etc.). The secondary processing of MMC’s, like machining, is challenging and sometimes infeasible by conventional machining processes. The present study reports development and investigation on a new non-conventional hybrid machining process named near-dry

An autogenously dissimilar Al0.1CoCrFeNi-high entropy alloy/stainless steel (i.e., AISI 304) weld joint was produced by an electron-beam welding technique. The weld metal followed mode A of solidification and resulted in a fully austenitic columnar dendritic microstructure due to rapid cooling and lower chromium equivalent to nickel equivalent (Creq/Nieq) ratio (1.12–1.14). Tensile test sample fractures