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Metals and Materials International

, Volume 23, Issue 3, pp 618–624 | Cite as

Influence of Cu2S precipitates dissolution on ferrite grain growth during heat treatment in the non-oriented electrical steel sheet

  • Yuan Wu
  • Fangjie Li
  • Ting Wang
  • Dan Zhao
  • Hefei Huang
  • Huigai Li
  • Shaobo Zheng
Article
  • 78 Downloads

Abstract

The factor to deduce grain growth of non-oriented electrical steel sheet during heat treatment was researched in this paper. Scanning electron microscope equipped with electron backscatter diffraction (EBSD), X-ray diffraction and transmission electron microscope were used to characterize the microstructure, dislocation density and precipitate, respectively. The EBSD results indicated that the grain size increased from 18.7 μm to 56 μm after heat treatment. Meanwhile, the characterization of grain size distribution, dislocation density and precipitates revealed that the dissolution of Cu2S precipitates, which act as inhibitor, may lead to the grain growth. In addition, the pinning force of grain boundary and the driving force of grain growth were calculated. Based on experiments results and theoretical calculations, the Cu2S precipitates with diameter of less than 39 nm and volume fraction of 1.74 × 10-4 would be sufficient to inhibit the ferrite grain growth. Heat treatment provides an efficient way to prompt the grain growth.

Keywords

magnetic materials annealing grain growth transmission electron microscopy (TEM) Cu2S precipitate 

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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Yuan Wu
    • 1
  • Fangjie Li
    • 1
  • Ting Wang
    • 1
  • Dan Zhao
    • 1
  • Hefei Huang
    • 2
  • Huigai Li
    • 1
  • Shaobo Zheng
    • 1
  1. 1.State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and EngineeringShanghai UniversityShanghaiChina
  2. 2.Shanghai Institute of Applied PhysicsChinese Academy of Sciences (CAS)ShanghaiChina

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