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Reversion mechanismfrom deformation induced martensite (o() to austenite (y) has been investigated in two metastable austenitic stainless steels, 15.6/*Cr-9.8"/Ni ( the 16Cr-10Ni) and 17,6/Cr-8.8/Ni (the 18Cr-9Ni) steels, by means of magnetic analysis and transmission electron microscopy. Metastable y almost completely transforms to lath a:' by 90"/ cold rolling, and the c( again reverts to */ during annealing at temperatures above 700 K, Deformation induced c( in the 1 6Cr-1 ONi steei undergoes a martensitic shear reversion during heating to 923K annealing, while that in the 18Cr-9Ni steel does a diffusional nucleation-growth reversion on 923 K annealing. Grain refining processes are greatly influenced depending on the reversion mechanism, Martensitically reversed y has a high density of dislocations immediately after the reversion and the y grains are refined through recovery and recrystallization process just like that taking place in a deformed y. On the other hand, diffusionally reversed y is characterized by the nucieation of equiaxed y grains within the c(' matrix and the y grains gradually grow during annealing.
Tomimura et al. (Tue,) studied this question.