Strain hardening features of metastable austenite-martensite steels

A physical approach is developed for describing deformation diagrams of the metastable states of austenite-martensite steels over a wide range of change in the original quantitative ratio of the phases and type of stressed state with biaxial tension. The approach is based on structural effects revealed by experiment of the reciprocal influence of the phases connected with a intentional change in their fine structure, and with development of residual tensile stresses in phase-hardened austenite and its strengthening effect on strain-induced martensite. From the standpoint of the different relationships obtained as applied to steel 07Kh16N6 the different sensitivity of yield and ultimate strengths to the quantitative phase ratio and invariance of generalized deformation curves to the principal stress ratio is substantiated.From papers at the III All-Union symposium Strength of materials and structural elements with a complex stressed state, Zhitomir (1989).Translated from Problemy Prochnosti, No. 6, pp. 23–27, June, 1991.