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.

本文研究了亚稳态奥氏体钢AISI 348在多轴循环载荷下的应变诱发马氏体相变和循环塑性模型。进行了在不同应力三轴性和应变幅度下的循环载荷测试，并用于验证材料模型。基于Santacreu模型，通过定义相变的等效塑性应变阈值，获得了多轴循环载荷条件下马氏体相变演化的动力学模型。该模型可以退化为简化形式，以描述在单调载荷下应变诱发的马氏体演变。该模型对马氏体含量的预测与实验吻合良好。通过将马氏体转变为各向同性硬化的影响相关联，获得并验证了改进的Ohno-Wang模型。引入的模型很好地描述了沿不同加载路径和历史的应力应变响应。