Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of the Number of Cold Rolling Passes on the Formation of {110}<001> Goss-Oriented Grains in Fe-3.2 wt% Si Electrical Steel

Fe-3.2 wt% Si 방향성 전기강판에서 냉간압연 횟수가 집합조직과 {110}<001> Goss 결정립 형성에 미치는 영향

  • Jeon, Soeng-Ho (Department of Advanced Materials Science and Engineering, Kumoh National Institute of Technology) ;
  • Park, No-Jin (Department of Advanced Materials Science and Engineering, Kumoh National Institute of Technology)
  • 전성호 (금오공과대학교 신소재공학과) ;
  • 박노진 (금오공과대학교 신소재공학과)
  • Received : 2017.08.24
  • Accepted : 2017.12.08
  • Published : 2018.02.28
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Abstract

An excellent grain-oriented electrical steel is composed of grains with exact Goss orientation. In order to produce this, it is important to control the Goss-oriented grains during the cold-rolling process. In this study, textures measured by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) were analyzed for 1, 10, and 36-pass cold-rolled sheets at a constant total thickness reduction rate of 89% in Fe-3.2 wt% Si grain-oriented electrical steel. After cold rolling, strong ${\alpha}$-fiber textures and relatively weak ${\gamma}$-fiber textures were developed in all specimens, regardless of the number of rolling passes. On the surface of the 36-pass rolled specimen, a weak ${\alpha}$-fiber texture and a relatively strong η-fiber texture developed compared with the other specimens. The Goss-oriented grains were mainly found in the shear band or micro band, which show that their fraction increases as the number of rolling passes increases, especially within the surface layer. As the number of Goss-oriented grains increased, the exactness of their orientation improved. It was determined that it is possible to obtain a grain-oriented electrical steel with a high-quality Goss orientation using a process such as subsequent recrystallization.

Keywords

Acknowledgement

Supported by : 금오공과대학교

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