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

  • Kengo HataEmail author
  • Kaori Kawano
  • Masaaki Sugiyama
  • Tomoyuki Kakeshita
Topical Collection: 3D Materials Science
  • 42 Downloads
Part of the following topical collections:
  1. 3D Materials Science

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.

Notes

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Kengo Hata
    • 1
    Email author
  • Kaori Kawano
    • 2
  • Masaaki Sugiyama
    • 3
  • Tomoyuki Kakeshita
    • 4
  1. 1.Advanced Technology Research LaboratoriesNippon Steel CorporationHyogoJapan
  2. 2.Research & Development LaboratoriesNippon Steel CorporationHyogoJapan
  3. 3.Department of Materials Science and EngineeringOsaka UniversityOsakaJapan
  4. 4.Fukui University of TechnologyFukuiJapan

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