AUSTENITE-]MARTENSITE TRANSFORMATION IN THE SURFACE-LAYER OF HARDENEDALPHA+GAMMA STEEL IN THE CASE OF ELASTOPLASTIC DEFORMATION AT DIFFERENT RATES

The influence of a stress less than the yield point (0.7 sigma(0.2)) a nd equal to the short-term strength sigma(B) and of a large deformatio n (to failure) in uniaxial tension at various rates (10(-4)-10(-2) sec (-1)) on the austenite-martensite phase transformation in the surface layer of hardened 36N14 alloy with a nonequilibrium two-phase structur e alpha + gamma at room temperature is investigated. The laws of gamma --> alpha transformation in the surface layer of the steel over ifs d epth and the propagation of this transformation along the sample as a function of the external stress and tension rate are established.