Thermo-mechanical cyclic hardening behavior of 304 stainless steel at large temperature ranges: Experiments and simulations

摘要

Thermo-mechanical cyclic experiments on 304 stainless steel were performed at several temperature ranges with T-min (minimum temperature) of 150 degrees C and T-max (maximum temperature) ranging from 350 degrees C to 1000 degrees C. Corresponding isothermal cyclic experiments were also performed at several temperatures. Temperature-history dependent cyclic hardening was thus observed to significantly occur under thermo-mechanical cyclic loading when T-max was around 600 degrees C. In contrast, almost no cyclic hardening occurred when T-max was 1000 degrees C. The observed, thermo-mechanical cyclic hardening behavior was then simulated using a cyclic viscoplastic constitutive model with a cyclic hardening parameter. The simulation focused on the saturated state of cyclic hardening, leading to the following findings. The saturated thermo-mechanical cyclic hysteresis loops were not predicted well by simply taking into account temperature dependence in the cyclic hardening parameter. Then, by assuming the cyclic hardening parameter to be dependent on T-max, the saturated thermo-mechanical hysteresis loops were simulated well. These mean that the cyclic hardening parameter of 304 stainless steel should not change with temperature but depend on T-max in the saturated state of cyclic hardening under thermo-mechanical cyclic loading. (C) 2017 Elsevier Ltd. All rights reserved.