Welding Damage Numerical Model of 15-5PH Stainless Steel
Résumé
For metal 15Cr-5Ni, a martensitic stainless steel, in the process of welding, it experiences the phase transformation of martensite to austenite during heating and the phase change to the martensite from austenite during cooling. Based on the study of damage concept in the multiphasic behaviour which occurs during welding process, a mesoscopic model is developed under phase transformation and damage condition. The constitutive equations of the model are coupling between ductile damage, small strain elasticity, finite visco-plasticity and phase transformation. The model uses the method of localization- homogenization to downsize to the single phase behavior and to combine to the macro behaviour. For the single phase behavior, it is based on the theory of thermodynamics and continuum damage mechanics (CDM). The constitutive equations are built to describe damage’s growth and crack appearance during and after welding. In localization-homogenization processing, the TRIP (TRansformation Induced Plasticity) is taken into account.
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