Experimental and Numerical Study on Mechanical Response Behavior of H13 Steel Under Thermo-Mechanical Loading
XU Guocai1,2, LI Junwan1,2, ZUO Pengpeng1,2, WU Xiaochun1,2
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China; 2 State Key Laboratory of Advanced Special Steel, Shanghai 200072, China
Abstract: In-phase (IP) and out-of-phase (OP) thermo-mechanical fatigue (TMF) behavior of H13 steel were studied in the range of 200—600 ℃, under the symmetrical tension and compression mechanical strain control by the MTS thermo-mechanical fatigue test system and an electromagnetic-thermo-mechanical coupled finite element model. In addition, based on experimental and simulation data, the life prediction of H13 steel was carried out in combination with life prediction models. The results show that the maximum tensile and compressive stresses decrease conti-nuously with the number of cycle increases in the quasi-stable thermo-mechanical cycle. The inelastic strain occurring in the high temperature half cycle of the thermo-mechanical cycle is greater than that in the low temperature half cycle. Taking the simulated data of IP-TMF with the mechanical strain of 0.7% as an example, the maximum stress values at the maximum tensile and compressive mechanical strains are 598 MPa and -1 148 MPa respectively. Under the mechanical strain of 0.7%, the measured IP and OP thermo-mechanical fatigue life (cycle) of H13 steel are 287 and 266 respectively, while under the mechanical strain of 0.9% they has lifes of 207 and 189, respectively. According to the experimental and simulation data, combined with ostergren model, the predicted fatigue life is obtained and compared with the measured one.
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