Martensite-to-austenite reversion and recrystallization in cryogenically-rolled type 321 metastable austenitic steel

Aletdinov, A. and Mironov, S. and Korznikova, G. F. and Konkova, T. and Zaripova, R. G. and Myshlyaev, M. M. and Lee Semiatin, S. L. (2019) Martensite-to-austenite reversion and recrystallization in cryogenically-rolled type 321 metastable austenitic steel. Metallurgical and Materials Transactions A, 50 (3). pp. 1346-1357. ISSN 1073-5623 (https://doi.org/10.1007/s11661-018-5070-9)

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Abstract

The annealing behavior of cryogenically-rolled type 321 metastable austenitic steel was established. Cryogenic deformation gave rise to martensitic transformation which developed preferentially within deformation bands. Subsequent annealing in the range of 600 C to 700 C resulted in reversion of the strain-induced martensite to austenite. At 800 C, the reversion was followed by static recrystallization. At relatively-low temperatures, the reversion was characterized by a very strong variant selection, which led to the restoration of the crystallographic orientation of the coarse parent austenite grains. An increase in the annealing temperature relaxed the variant-selection tendency and provided subsequent recrystallization thus leading to significant grain refinement. Nevertheless, a significant portion of the original coarse grains was found to be untransformed and therefore the fine-grain structure was fairly heterogeneous.

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