Influence of the change in grain shape in high-temperature thermomechanical working on the strength of steel

Abstract

1. The increase in high-temperature thermomechanical working in the yield strength of 40Kh2N2VA steel with an increase in the degree of deformation is caused by the formation of an austenitic substructure and the inheritance of this substructure by the martensite crystals. 2. The increase in yield strength with an increase in the degree of deformation is more significant in fine-grained steel than in coarse-grained. 3. The increased strength after high-temperature thermomechanical working accompanied by recrystallization is to a significant degree caused by the fine-grained structure (average grain size no more than 10 μm).