Abstract
The effect of shape and volume fraction of retained austenite on the uniaxial behavior of transformation induced plasticity(TRIP) steels was studied by using the numerical and experimental methods. 0.16%C-1.4%Si-1.4%Mn TRIP steels were intercritically annealed at 800 o C and 840 o C, and isothermally transformed at 450 o C (Banite Transformation) during 1, 5 and 10 min. As the bainite isothermal transformation time increased, the volume fraction of retained austenite, tensile stress and total elongation decreased, and 0.2% yield stress increased. Finite element method calculations were carried out by using ABAQUS user subroutine UMAT based on the finite deformation theory and self-consistent method. Numerical results were in good agreement with experimental data.
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