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Effect of tungsten particle shape on dynamic deformation and fracture behavior of tungsten heavy alloys

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Abstract

The effect of the tungsten particle shape on the dynamic deformation and fracture behavior of tungsten heavy alloys was investigated. Dynamic torsional tests were conducted using a torsional Kolsky bar for five alloys, one of which was fabricated by the double-cycled sintering process, and then the test data were compared via microstructures, mechanical properties, adiabatic shear banding, and fracture mode. The dynamic torsional test results indicated that in the double-sintered tungsten alloy whose tungsten particles were very coarse and irregularly shaped, cleavage fracture occurred in the central area of the gage section with little shear deformation, whereas shear deformation was concentrated in the central area of the gage section in the other alloys. The deformation and fracture behavior of the double-sintered alloy correlated well with the observation of the impacted penetrator specimen and the in situ fracture test results, i.e., microcrack initiation at coarse tungsten particles and cleavage crack propagation through tungsten particles. These findings suggested that the cleavage fracture mode would be beneficial for the self-sharpening effect, and, thus, the improvement of the penetration performance of the double-sintered tungsten heavy alloy would be expected.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Dong-Kuk Kim (Research Assistant) & Sunghak Lee (Professor)

  2. Agency for Defense Development, 300-600, Daejeon, Korea

    Heung-Sub Song (Senior Research Scientist)

Authors
  1. Dong-Kuk Kim
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  2. Sunghak Lee
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  3. Heung-Sub Song
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Kim, DK., Lee, S. & Song, HS. Effect of tungsten particle shape on dynamic deformation and fracture behavior of tungsten heavy alloys. Metall Mater Trans A 29, 1057–1069 (1998). https://doi.org/10.1007/s11661-998-1015-z

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  • DOI: https://doi.org/10.1007/s11661-998-1015-z

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