Modelling of cyclic plasticity and martensitic transformation for type 304 austenitic stainless steel

Isothermal monotonic tension and cyclic tests are conducted on type 304 austenitic stainless steel at 20, 50 and 80 degrees C from which stress-strain curves and martensite volume fraction were evaluated. The obtained data showed that deformation induced martensitic transformation was highly temperature dependent in monotonic tensile and cyclic tests. In cyclic test, stagnation of martensitic transformation was observed during the Bauschinger region, which imply that the transformation was triggered by austenite stress rather than the plastic strain. Finally, constitutive model based on stress induced hypothesis was proposed and it was validated by comparing the experimental results and the calculation with the conventional Stringfellow model. (C) 2017 Elsevier Ltd. All rights reserved.