Effect of kinematic stability of the austenite phase on phase transformation behavior and deformation heterogeneity in duplex stainless steel using the crystal plasticity finite element method

The crystal plasticity finite element method (CPFEM) was applied to determine the influence that the kinematic stability of the austenite (γ) phase exerts on the phase-transformation behavior and deformation heterogeneity of duplex stainless steel (DSS) polycrystalline materials showing γ to martensite (α′) transformation during uniaxial tension. A phase-transformation model was implemented in the CPFEM to consider the effect of transformation-induced plasticity (TRIP) on micromechanical behaviors in DSS. The individual flow curves of the ferrite (α), γ and α′ phases in DSS were determined via in-situ neutron diffraction in combination with the CPFEM. The effect of the kinematic stability of the γ phase on phase-transformation behavior and deformation heterogeneity in DSS during uniaxial tension was demonstrated using the CPFEM based on the representative volume elements (RVEs) of a unit cell for DSS.