Effect of surface carburization on dynamic deformation and fracture of tungsten heavy alloys

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Effects of surface carburization on dynamic deformation and fracture behavior of tungsten heavy alloys were investigated in order to improve the penetration performance. Dynamic torsional tests using a torsional Kolsky bar were conducted on four specimens, three of which were carburized by the case carburization process. The test data were then compared with hardness, Charpy impact energy, adiabatic shear banding, deformation and fracture mode, and penetration performance, With increasing carburization temperature and time, surface hardness increased, but impact energy decreased. The dynamic torsional test results indicated that for the carburized tungsten specimens, cleavage fracture occurred in the center of the gage section with little shear deformation, whereas shear deformation was concentrated at the center of the gage section for the conventionally processed specimen without carburization. The deformation and fracture behavior of the carburized specimens correlated well with the observation of the impacted penetrator specimens, i.e,, microcrack initiation at tungsten particles and cleavage crack propagation. Since the cleavage fracture mode is thought to be beneficial for self-sharpening, these findings suggest the beneficial effect of the surface carburization on the penetration performance.
Publisher
MINERALS METALS MATERIALS SOC
Issue Date
1999-08
Language
English
Article Type
Article
Keywords

ADIABATIC SHEAR BANDS; W-NI-FE; PRECIPITATION; PENETRATION; STEELS; MATRIX

Citation

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.30, no.8, pp.2027 - 2035

ISSN
1073-5623
URI
http://hdl.handle.net/10203/76330
Appears in Collection
MS-Journal Papers(저널논문)
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