A thermomechanical treatment, which applies reversion from deformation induced martensite (oc') to ultra grain refining of austenite (y), was proposed for metastable austenitic stainless steels.To determine optimai steels for the treatment, the effect of chemical composition on the yc( transformation behavior during cold rolling and the o(-y reversion behavior by successive annealing was investigated in Fe-Cr-Ni ternary alloys, An ultra fine y grain structure was obtained when steeis satisfied the fol!owing three compositional conditions:(1 ) Metastable y should be almost completely transformed to a' during cold rolling at room temperature.The amount of o( induced by 90"/• cold roiling can be estimated by the Ni equivalent (Ni+0.35Cr).For steels with the Ni equivalent of less than 1 6.0 mass"/o, over 90vol"/o Of y transforms to o( during 90"/• co]d rol]ing at room temperature.
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Tomimura et al. (1991) studied this question.