Effect of prior austenite grain size on martensitic transformation in medium manganese steel

doi:10.13251/j.issn.0254-6051.2021.09.004

Abstract

Abstract: Effect of prior austenite grain size in medium manganese steel on kinetics of martensitic transformation was studied. The kinetics of martensitic transformation and microstructure evolution were analyzed by combining with SEM, XRD, thermal dilatometer and EBSD results. Different prior austenite grain sizes with (190±15), (36±2), (11±2) and (4.8±2) μm were achieved, respectively, by heating at different austenitizing temperatures. The results show that with the decreasing of prior austenite grain size, the martensite start temperature decrease from 289 ℃ to 250 ℃, while the kinetic of martensitic transformation increase at first then decrease. The kinetics of martensitic transformation is closely related to the number of martensite nucleation cites per unit volume, while the number of martensite nucleation cites are closed to the prior austenite grain size and the martensite lath aspect ratio. When the size of prior austenite grain decreases to 5 μm, the aspect ratio of martensite lath increases, while the increase rate of martensite nucleation cites with undercooling significantly reduces, which results in the decrease of the rate of martensite transformation.

Key words: medium manganese steel, heat treatment, prior austenite grain size, martensitic transformation

CLC Number:

TG113.12

Du Pengju, Wu Di. Effect of prior austenite grain size on martensitic transformation in medium manganese steel[J]. Heat Treatment of Metals, 2021, 46(9): 21-27.

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