Texture evolution of non-oriented electrical steel analyzed by EBSD and in-situ XRD during the phase transformation from γ to α

• Published in: Materials today communications 2020-12, Vol.25, p.101307, Article 101307
• Main Authors: Ahn, Yong-Keun, Jeong, Yong-Kwon, Kim, Tae-Young, Cho, Ji-Ung, Hwang, Nong-Moon
• Format: Article
• Language: English
• Subjects: Electrical steel; Electron backscattering diffraction (EBSD); In-situ XRD; Phase transformation; Texture
• ISSN: 2352-4928; 2352-4928
• DOI: 10.1016/j.mtcomm.2020.101307

[Display omitted] •Texture was compared between two compositions under the same heat treatment.•Dominant cube texture is obtained from the Fe-2 wt%Si-1 wt%Ni by γ→α transformation.•Peaks for orientations during heating and cooling was observed by in-situ XRD. If the phase transformation from γ to α is properly controlled in silicon steel, the cube texture is known to be produced. Two sheet samples of Fe-2 wt%Si-1 wt%Ni and Fe-3 wt%Si-2.5 wt%Ni were heated to 1100 °C, held for 2 h and then cooled. The inverse pole figure (IPF) map and the orientation distribution function (ODF) of the two samples indicate that the {100} texture is dominant in the Fe-2 wt%Si-1 wt%Ni sample whereas the {112} texture is dominant in the Fe-3 wt%Si-2.5 wt%Ni sample. In order to understand why such drastically different textures were evolved, the in-situ X-ray diffraction (XRD) analysis was made during heating and cooling of the two samples. The XRD peaks of Fe-2 wt%Si-1 wt%Ni indicate that 1100 °C is one phase region, which affects strong {100} texture by preferred orientation during cooling. However, 1100 °C is the (α + γ) two phase region for the Fe-3 wt%Si-2.5 wt%Ni. Therefore, the final texture was affected by remained orientation, which leads to strong {112} texture. This difference is attributed to the evolution of such drastically different textures between the two samples.