Dimensional anisotropy during phase transformations in a chemically banded 5140 steel. Part II: modeling Original Research Article

Dimensional anisotropy associated with chemical banding was investigated using a material point model to simulate transformation anisotropy due to manganese inhomogeneity. A manganese dependent, internal state variable model for athermal martensite transformation was used to estimate the strains that develop in two layers of differing manganese content which maintain a coherent interface. Classical plasticity and transformation plasticity were included in simulations and compared to measured values for a steel with an engineered manganese segregation pattern presented in a companion paper (Jaramillo et al. Acta Mater., submitted). The results are consistent with the hypothesis that transformation plasticity is the mechanism by which shape change occurs in the chemically banded steel.