Cyclic responses and microstructure sensitivity of Cr-based turbine steel under different strain ratios in low cycle fatigue regime

• DOI: 10.1016/j.matdes.2021.109529
• Publication Date: 2021-01-28T16:30:49Z
• Authors: Xiufang Gong; Tianjian Wang; Qingsong Li; Yongjie Liu; Hong Zhang; Wei Zhang; Quanyi Wang; Qingyuan Wang
• Keywords: Cyclic stress; Strain (injury); Hysteresis; Strain energy

When turbine steel services, i.e., startup and shutdown processes, the cyclic mechanical stress caused by asymmetry loading conditions is introduced. To study effect of mean strain on cycle response microstructure-sensitive at room temperature, low fatigue under two ratios was used. Experimental results indicate that significant softening observed for both modes. The ratio independent amplitude ratio. plastic strain, energy density, cumulative density 0.1 are higher than −1. Therefore, applied life fitted Manson-Coffin formula lower According to evaluation internal variables, back stress, isotropic viscous modes, a critical part which can directly control behavior. Besides, prediction model considering constituted through hysteresis method. Finally, linked microstructure transmission electron microscopy. sensitive evaluated deduced.