3D Crystallographic Analysis of Grain Boundaries of Austenite Transformed from Ferrite on Heating in Fe-Mn-C Alloy

Abstract

To control the ferrite and martensite microstructure in dual-phase steels, the phase transformation from ferrite (α) to austenite (γ) on heating is essential. For a comprehensive understanding of the γ formation in the early stage of the αγ phase transformation, the orientation relationships and the boundaries between α and γ grains were investigated using a 3D electron backscatter diffraction analysis. It was found that, when the orientations of the α and γ grains hold the K–S relationship or the N–W relationship, the orientation of the boundary does not correspond to the exact close-packed planes {011}α or {111}γ, but deviates within the vicinity of these crystal planes based on a variety of misorientations of up to 40 deg. Most of the boundary planes with the K–S relationship are parallel to the crystal planes between {011}α and {111}α of the α grain, and {111}γ and {012}γ of the γ grain. Focusing on the crystallographic feature of the boundary planes in austenite phase, the mechanism of the αγ transformation is discussed.

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Correspondence to Kengo Hata.

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Manuscript submitted May 1, 2019.

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Hata, K., Kawano, K., Sugiyama, M. et al. 3D Crystallographic Analysis of Grain Boundaries of Austenite Transformed from Ferrite on Heating in Fe-Mn-C Alloy. Metall Mater Trans A 51, 51–57 (2020). https://doi.org/10.1007/s11661-019-05556-8

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