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Plasticity modeling for a metastable austenitic stainless steel with strain-induced martensitic transformation under cyclic loading conditions
Materials Science and Engineering: A ( IF 4.081 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.msea.2020.138961
Cheng Luo; Wu Zeng; Jingyu Sun; Huang Yuan

In the present paper, the strain-induced martensitic transformation and the cyclic plasticity model of a metastable austenitic steel AISI 348 under multi-axial cyclic loadings were studied. Cyclic loading tests under different stress triaxialities and strain amplitudes were carried out and used to verify the material model. Based on the Santacreu model, a kinetics model for evolution of martensitic transformation under multi-axial cyclic loading conditions was obtained by defining a threshold of equivalent plastic strain for phase transformation. The model can degenerate into a simplified form to describe strain-induced martensite evolution under monotonic loadings. The prediction of martensite content by the model matched well with experiments. By correlating the effect of martensitic transformation into isotropic hardening, a modified Ohno-Wang model was obtained and verified. The stress–strain response along the different loading paths and histories was well described by the introduced model.
更新日期:2020-01-17

 

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