Effect of size and shape of tungsten particles on dynamic torsional properties in tungsten heavy alloys

Journal Article · Sat May 01 04:00:00 UTC 1999 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-999-0275-6· OSTI ID:363985

Kim, D K; Lee, S ^[1]; Song, H S ^[2]

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1. Pohang Univ. of Science and Technology (Korea, Republic of). Center for Advance Aerospace Materials
2. Agency for Defense Development, Daejeon (Korea, Republic of)

The effect of the size and shape of tungsten particles on dynamic torsional properties in tungsten heavy alloys was investigated. Dynamic torsional tests were conducted on seven tungsten alloy specimens, four of which were fabricated by repeat ed sintering, using a torsional Kolsky bar, and then the test results were compared via microstructure, mechanical properties, adiabatic shear banding, and deformation and fracture mode. The size of tungsten particles and their hardness were increased as sintering temperature and time were increased, thereby deteriorating fracture toughness. The dynamic torsional test results indicated that in the specimens whose tungsten particles were coarse and irregularly shaped, cleavage fracture occurred predominantly with little shear deformation, whereas shear deformation was concentrated into the center of the gage section in the conventionally fabricated specimens. The deformation and fracture behavior of the specimens having coarse tungsten particles correlated well with the observation of the in situ fracture test results, i.e., cleavage crack initiation and propagation. These findings suggested that there would be an appropriate tungsten particle size because the cleavage fracture mode would be beneficial for the self-sharpening of the tungsten heavy alloys.

• Sponsoring Organization: USDOE
• OSTI ID: 363985
• 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: 5 Vol. 30; ISSN MMTAEB; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CORRELATIONS
CRACKS
DEFORMATION
FRACTURE PROPERTIES
MICROSTRUCTURE
PARTICLE SIZE
SHAPE
TORSION
TUNGSTEN ALLOYS