Effect of tensile deformation on variant selection in {225}γ plate martensite and {557}γ lath martensite

The effect of tensile deformation on variant selection has been studied in {225}γ plate martensite and {557}γ lath martensite formed in high- and low-carbon steels, respectively. Different thermomechanical treatments are performed to analyse the effect of applied tensile stress, in the elastic and plastic range and the effect of prior plastic tensile deformation on variant selection. The variant selection is studied by computing the work of the deformation associated with the transformation in the applied stress field. Our analysis indicates that the deformation that needs to be considered to model the selection is based on lattice strains combinations. For {225}γ plate martensite, the average deformation resulting from the combination of the lattice strains of twin-related variants is the relevant deformation gradient for the work computation. On the contrary, in lath martensite, the combination of the lattice strains of low-misoriented variants appears to better model the selection phenomenon.

Abstract licence: CC BY-NC

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