Processing strategy for consolidating tungsten heavy alloys for ordnance applications

Upadhyaya, Anish

doi:10.1016/s0254-0584(00)00426-0

Cited by 155 publications

(46 citation statements)

References 11 publications

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“…Tungsten heavy alloys are generally used in applications such as balance weights, extruding tools for wires and bars, radiation shields, welding electrodes and kinetic energy penetrators [1][2][3]. This is mainly due to their high density and excellent mechanical properties.…”

mentioning

confidence: 99%

Effect of swaging on microstructure and tensile properties of W–Ni–Fe alloys

Durlu

Çalışkan

Bor

2014

International Journal of Refractory Metals and Hard Materials

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mentioning

confidence: 99%

Effect of swaging on microstructure and tensile properties of W–Ni–Fe alloys

Durlu

Çalışkan

Bor

2014

International Journal of Refractory Metals and Hard Materials

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“…This slight increase in hardness can be attributed to the fact that, hardness is a surface property, which is much less affected by the presence of intermetallic brittle phases on the boundaries of tungsten grains, and the nature of the interfacial bond between tungsten particles and matrix. Here, we can conclude that the heat treated alloys can provide improved mechanical properties and can be considered suitable candidate for applications that depend on high stress, like improving the ballistic performance for the kinetic energy penetrators, where the ductility enough satisfactory for these applications [7].…”

Section: Mechanical Propertiesmentioning

confidence: 79%

Effect of Heat Treatment on the Mechanical Properties and Fracture Behavior of Tungsten Heavy Alloys

R.Osama¹

2017

IJRET

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The objective of this experimental study is to investigate the effect of heat treatment on the mechanical properties and the fracture behavior of the liquid phase sintered (LPS) tungsten heavy alloys. For this purpose, tungsten alloy with three different compositions 93%W-4.9%Ni-2.1% Fe, 91%W-6%Ni-3%Co and 90.5%W-5.6%Ni-1.4%Fe-1.5%Co were prepared by conventional powder metallurgy route. Elemental powders were mixed using planetary mixer for 5 hours to ensure suitable homogeneity. Uni-axial compaction pressure of 200 MPa was applied to obtain standard tensile and impact specimens. Vacuum liquid phase sintering was carried out at 1500ᵒC for 60 minutes. The sintered specimens were then heat treated, at 1100°C for 60 min, in an atmosphere of dynamic argon gas, and then water quenched. The effect of this heat treatment was characterized in terms of hardness, impact resistance and tensile properties and compared to those properties for samples in the as sintered state. The application of the prescribed heat treatment on these heavy alloys with the adopted chemical compositions provided a remarkable improvements in the mechanical properties. The tensile fracture behavior of these alloys with was studied. By scanning electron microscope, the obtained micrographs of the fractured surfaces showed that, by the application of the prescribed heat treatment, the fracture modes changed from brittle intergranular separations to matrix failure and tungsten cleavage which corresponds to a net improvement in mechanical properties, especially in the alloys where cobalt is added to the matrix constitution. This can be attributed to the increase in tungsten-matrix interfacial strength by the dissolution and of brittle intermetallic phases. It can be concluded that tungsten heavy alloys, particularly when cobalt is added as an alloying element should be used in the heat treated state. The effect of heat treatment is thus attributed to the dissolution of the brittle phases that may form on the M/W interface.

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“…Highly pure W powders with particle size in the range of 2e6 mm were purchased from Zhuzhou Kete Industries Co., Ltd. The desired composition of the WeNiTi composites contains 88% W in mass fraction, which was in the range of the conventional two-phase tungsten-based composites (containing 80 to 98 wt% tungsten) [39]. The WeNiTi composites were synthesized by two steps in a vacuum hot-pressing furnace.…”

Section: Methodsmentioning

confidence: 99%

Fabrication, microstructure and mechanical properties of W NiTi composites

Shao

Guo

Huan

et al. 2017

Journal of Alloys and Compounds

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a b s t r a c tNew two-phase tungsten-based composites containing 88 wt% tungsten powders and 12 wt% nearly equiatomic NiTi alloy deforming by martensite variant detwinning were fabricated by infiltration and hot pressing in this study. 53 Nb 5 composite exhibited a double-yielding phenomenon under compression with an ultimate compressive strength of 3820 MPa and a deformation of 50.4%. In-situ synchrotron high-energy Xray diffraction measurements revealed the first yielding was caused by the martensite reorientation of the NiTi matrix and the second was due to the commencement of massive plastic deformation of the reoriented martensite and is also attributed to the microscopic internal fracturing of the W particles.

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Processing strategy for consolidating tungsten heavy alloys for ordnance applications

Cited by 155 publications

References 11 publications

Effect of swaging on microstructure and tensile properties of W–Ni–Fe alloys

Effect of swaging on microstructure and tensile properties of W–Ni–Fe alloys

Effect of Heat Treatment on the Mechanical Properties and Fracture Behavior of Tungsten Heavy Alloys

Fabrication, microstructure and mechanical properties of W NiTi composites

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