Investigation on the nucleation mechanism of deformation-induced martensite in an austenitic stainless steel under severe plastic deformation

Abstract

The nucleation mechanism of deformation-induced martensite was investigated by x-ray diffraction and transmission electron microscope in an ultra-low carbon austenitic stainless steel deformed by equal channel angular pressing at room temperature. It was found that two types of martensite transformation mechanism, stress-assisted and strain-induced, occurred via the sequences of γ (fcc) → ϵ (hcp) → α′ (bcc) and/or γ → α′. In both cases, the crystallographic relationships among γ, ϵ, and α′ followed the Kurdjumov-Sachs orientation relationships: {111}γ //{0001}ϵ //{011}α′ and 〈110〉γ//〈1120̄〉ϵ//〈1̄11〉α′

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Huang, C.X., Yang, G., Gao, Y.L. et al. Investigation on the nucleation mechanism of deformation-induced martensite in an austenitic stainless steel under severe plastic deformation. Journal of Materials Research 22, 724–729 (2007). https://doi.org/10.1557/jmr.2007.0094

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