Calibration of Combined Model of Ductile Damage Evolution and Strain-Induced Martensitic Transformation for AISI 304 Austenitic Stainless Steel at Cryogenic Temperature

In this research, the evolution of ductile damage and strain-induced martensitic transformation of AISI 304 stainless steel have been obtained from experimental tests at first. Each test contains two stages. The first stage is the tensile testing of floating test piece in liquid nitrogen and the second is performing XRD to obtain the phase of the test piece. First of all, the tensile tests have been performed for a verity of elongation on the AISI 304 stainless steel test pieces at cryogenic temperature. Therefore, the cryogenic chamber has been designed and crafted. So, the graph of force-deformation has been achieved. Then, this test pieces have been tested with XRD and the available phases and the volume fraction of martensite for the variety of elongation, has been obtained from this test. Numerical simulation has been performed by the implementing the UMAT code in ABAQUS. In the simulation, the properties achieved from experimental tests are employed. The numerical simulation has two separated sections: damage-plastic and martensitic phase transformation. . In this research, by considering the experimental test data, the final model has been calibrated in monotonic tensile loading and the coefficients has been obtained.