Abstract
The constitutive equation for the TRIP steel has been improved through precise uniaxial tension tests under several environmental temperatures. To elucidate highly nonuniform deformation behavior dependent on martensitic transformation, computational simulations with the proposed constitutive equation are carried out for TRIP steel bars with a ringed notch under Mode I loading. The distribution of volume fraction of martensite phase is compared with that obtained by micro hardness measurements around the notch tip in the cross-sectional plane. Fairly good correspondence between these two results verify the applicability of proposed constitutive model to highly inhomogeneous deformation behavior.
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