Swaging and heat treatment studies on sintered 90W–6Ni–2Fe–2Co tungsten heavy alloy

Kiran, U. Ravi; Rao, A. Sambasiva; Sankaranarayana, M.; Nandy, T.K.

doi:10.1016/j.ijrmhm.2012.03.003

Cited by 56 publications

(16 citation statements)

References 8 publications

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“…The room-temperature tensile properties of the as-swaged tungsten alloy samples show that the ultimate tensile strength of the alloy increases significantly (Figure 8). The ultimate tensile strength increases from 750 MPa for sintered to 1640 MPa for 75% swaged alloy [90].…”

Section: Tensile Strength Andmentioning

confidence: 99%

“…Significant improvements in mechanical properties of WHAs are achieved by hot extrusion, hot isostatic extrusion, and cold deformation, forged and swaging of compacts prepared from ball milled powder or powder mixtures [87][88][89][90], but the last one indicates that the mechanical properties depend on the amount of deformation imparted during swaging. Rapid heat experiments of the order of seconds are performed on a 90W-7Ni-3Fe alloy, which is cold worked by rotary swaging to 50 and 82% reduction in diameter [90]. Refined and elongated W grains into small round ones are obtained and increased deformation enhances the process of partition of W grains.…”

Section: High Energy Ballmentioning

confidence: 99%

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Recent Progress in Processing of Tungsten Heavy Alloys

Şahin

2014

Journal of Powder Technology

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Tungsten heavy alloys (WHAs) belong to a group of two-phase composites, based on W-Ni-Cu and W-Ni-Fe alloys. Due to their combinations of high density, strength, and ductility, WHAs are used as radiation shields, vibration dampers, kinetic energy penetrators and heavy-duty electrical contacts. This paper presents recent progresses in processing, microstructure, and mechanical properties of WHAs. Various processing techniques for the fabrication of WHAs such as conventional powder metallurgy (PM), advent of powder injection molding (PIM), high-energy ball milling (MA), microwave sintering (MW), and spark-plasma sintering (SPS) are reviewed for alloys. This review reveals that key factors affecting the performance of WHAs are the microstructural factors such as tungsten and matrix composition, chemistry, shape, size and distributions of tungsten particles in matrix, and interface-bonding strength between the tungsten particle and matrix in addition to processing factors. SPS approach has a better performance than those of others, followed by extrusion process. Moreover, deformation behaviors of WHA penetrator and depleted uranium (DU) Ti alloy impacting at normal incidence both rigid and thick mild steel target are studied and modelled as elastic thermoviscoplastic. Height of the mushroomed region is smaller forα=0.3and it forms sooner in each penetrator as compared to that forα=0.2.

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Section: Tensile Strength Andmentioning

confidence: 99%

Section: High Energy Ballmentioning

confidence: 99%

Recent Progress in Processing of Tungsten Heavy Alloys

Şahin

2014

Journal of Powder Technology

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“…It was noted that, as the swaging percentage increase the grain elongation on the deformation axis increase. Also U. Ravi Kiran [10] reported that, The increase in swaging percentage leads to increase in the aspect ratio (L/D) of the tungsten grains in the longitudinal cross section, from about 1:1 (0% deformation) to approximately 7:1 (75% deformat ion).…”

Section: Effect On the Physical And Mechanical Propertiesmentioning

confidence: 99%

Effect of Cold Swaging on the Mechanical and Microstructure Characteristics of Tungsten Heavy Alloy

R.Osama¹

2016

IJRET

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In this experimental investigation, the post sintering mechanical treatment was implemented by cold swaging the produced tungsten alloy rods with composition (90W-7Ni-3Fe %wt) by cold isostatic press with 300 MPa, and appling different reductions of cross sectional area varying from 10% up to 50%. On the mechanical and microstructure properties of the tungsten heavy all oy (89.97W-7Ni-3Fe-0.03 Y2O3 %wt). Elemental powders were mixed for 120 min. Green compacted by cold isostatic press with 300 MPa, and Finally the specimens were sintered at 1480ºC for 90 min under vacuum atmosphere. It was found that the ultimate tensile strength and hardness were remarkably increased by about 39% and 45% respectively, by the application of 50% area reduction by swaging, relative to the sintered specimens. On the other hand, ductility and impact resistance were deeply decreased by about 75% and 53% respectively, by also, the application of 50% area reduction by swaging.

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“…Therefore, many researchers have attempted to use high melting point refractory ferrous metals, such as molybdenum-based alloys or tungsten-based alloys, to make a die-casting mold to replace the traditional mold steel material. Among these, high-density R2M tungsten alloy has a high melting point, high density, good thermal conductivity and low coefficient of linear expansion, and is an ideal material for die-casting molds [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of vacuum carburizing on surface properties and microstructure of a tungsten heavy alloy

Liang

et al. 2020

Mater. Res. Express

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Vacuum carburizing of the R2M tungsten alloy was carried out to obtain a carburized layer that improves the surface properties. The effects of various carburizing temperatures and times on the structure and hardness were studied by Optical microscopy(OM), x-ray Diffraction(XRD) and Scanning electron microscope(SEM). In this work, the microstructure of the carburized layer, the relative content of the surface layer, the depth of the layer and the microhardness of the carburized sample were studied. The results show that the microstructure exhibited three layers from the surface to the bulk of the sample after carburizing. The outside layer comprised a 40∼60 μm deep WC carburized layer. The hardness of the surface layer (396 HV) was significantly higher than that of the substrate (282 HV). As the carburizing temperature and time increased, the WC and W content of the surface layer of the sample gradually increased, and the depth of the carburized outer layer increased.

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Swaging and heat treatment studies on sintered 90W–6Ni–2Fe–2Co tungsten heavy alloy

Cited by 56 publications

References 8 publications

Recent Progress in Processing of Tungsten Heavy Alloys

Recent Progress in Processing of Tungsten Heavy Alloys

Effect of Cold Swaging on the Mechanical and Microstructure Characteristics of Tungsten Heavy Alloy

Effect of vacuum carburizing on surface properties and microstructure of a tungsten heavy alloy

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