Abstract
The interactions between twins and dislocations were investigated at different stage of dynamic microstructure evolution during hot shear-compression deformation of the Fe-38Mn austenitic steel. It was proved that the step-like structure located at the boundaries of pre-existing annealing twins was induced by the interactions of twins and dislocations in the case of low strain level. These steps provided favorable nucleating positions for the new grains. Benefited from the large strain and high strain rate during the hot shear-compression deformation, the deformation twins in different scales appeared with further increasing the strain. Moreover, the interactions between the deformation twins and dislocations were frequently found. As a result, the nano-grain was induced by the migration of incoherent twin boundaries in the case of large strain. The above works indicate a dynamic mechanism of grain refinement in term of the interactions between twins and dislocations during hot deformation with large strain and high strain rate.
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