Author(s)

S.-G. Hong & S.-B.Lee

Abstract

Influence of strain rate on tensile and LCF properties of prior cold worked 316L stainless steel in dynamic strain aging regime S.-G. Hong & S.-B. Lee Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Republic of Korea Abstract Tensile and LCF (low cycle fatigue) tests were carried out in air in a wide temperature range of 20°C-750°C and strain rates of 1 ~ 1 0 ~ ~ / s - l ~ 1 0 ~ ~ / s to investigate the influence of strain rates on the tensile and LCF properties of prior cold worked 316L stainless steel, especially in the DSA (dynamic strain aging) regime. Dynamic strain aging induced a change in tensile properties such as strength and ductility in the temperature region 250°C-600°C, and this temperature region coincided well with the negative strain rate sensitivity regime. Cyclic stress responses at all test conditions were characterized by the initial hardening during a few cycles, followed by gradual softening until final failure. The DSA regimes

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