Abstract
The dynamic strain aging phenomenon is believed to be one of the most important mechanisms that harden the weld-heat-affected zone of low-carbon austenitic stainless steels. Hence, we investigated the effects of the test temperature and strain rate during tensile tests on the dynamic strain aging of type 316L stainless steel (SS) in this study. The results obtained are as follows; (1) Two types of stress-strain curves were obtained with serrations caused by the dynamic strain aging in the tensile tests at different test temperatures and strain rates, one with a high-frequency serration and the other with a low-frequency serration. (2) The area where the serration was observed was determined by two lines, showing that the temperature dependence of the strain rate was in the form of e=A exp {-Q/(RT)}, where A: constant, Q: apparent activation energy (150 kJ/mol or 300 kJ/mol), R: gas constant, T: absolute temperature. (3) The increase in the micro-Vickers hardness of type 316L SS after being strained to certain strains showed maximum values determined by both the test temperature and the strain rate. The largest increase in the hardness was obtained at the combination of the lowest temperature and the lowest strain rate among the test conditions.
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