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

Journal Article · Sun Aug 01 04:00:00 EDT 1999 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-999-0013-0· OSTI ID:691375

Jung, S W; Kang, S J.L. ^[1]; Kim, D K; Lee, S ^[2]; Noh, J W ^[3]

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1. Korea Advanced Inst. of Science and Technology, Daejeon (Korea, Republic of). Center for Interface Science and Engineering of Materials
2. Pohang Univ. of Science and Technology, Pohang (Korea, Republic of). Center for Advanced Aerospace Materials
3. Agency for Defense Development, Daejeon (Korea, Republic of)

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.

• Sponsoring Organization: USDOE
• OSTI ID: 691375
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 8 Vol. 30; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
CARBURIZATION
CORRELATIONS
DEFORMATION
FRACTURE PROPERTIES
HARDNESS
IMPACT SHOCK
PENETRATORS
PERFORMANCE
TUNGSTEN ALLOYS