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|저자명||N. Park, S.J. Lim, and H. Huh|
Tensile properties of heat-treated AISI4340 steel with a thickness of 1 mm were evaluated at various strain rates ranging from 0.001 s−1 to 1400 s−1 using Instron 5583, a high-speed material testing machine (HSMTM), and split Hopkinson pressure bar (SHPB) testing machine. The specimens for the tests were directly fabricated from the heat-treated projectiles made of AISI 4340 steel. Slack type jig system was utilized for the tests of the intermediate strain rate ranging from 0.1 s−1 to 100 s−1 to release load ringing phenomenon. Two dimensional digital image correlation (2D-DIC) method was employed to evaluate the strain distribution in the gauge section during tests. The heat-treated AISI4340 steel shows high strain-rate sensitivity in terms of the flow stress and strain hardening. These measures increase as the tensile strain rate increases. The dynamic tensile properties of the heat-treated AISI4340 steel are also compared with those of AISI4340 steel. The flow stress of the heat-treated AISI4340 steel is relatively high compared to that of AISI4340 steel in the entire range of the strain rates.