Strain distribution visualization of punched electrical steel sheets using neutron Bragg-edge transmission imaging. (1st April 2022)

• Record Type: Journal Article
• Authors: Sasada, Seiji; Takahashi, Yoshihito; Takeuchi, Keisuke; Hiroi, Kosuke; Su, Yuhua; Shinohara, Takenao; Watanabe, Kenichi; Uritani, Akira
• Is Part Of: Japanese journal of applied physics. Volume 61:Number 4(2022)
• Publication Date: 2022-04-01
• Subjects: neutron Bragg-edge transmission imaging -- strain mapping -- residual strain -- electrical steel sheet -- punched process; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ac5153
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Residual strains in a punched electrical steel sheet increase the iron loss in the steel sheet. To accurately estimate the effect of residual strain on iron loss, the residual strain distribution in a punched electrical steel sheet should be evaluated. In this study, we demonstrated the two-dimensional imaging of the residual strain distribution in a punched electrical steel sheet using the neutron Bragg-edge transmission imaging method. To improve the accuracy of strain measurement with minimal deterioration of spatial resolution, we applied a process of superposing many specimen images. The tensile strain near the punched edge and the compressive strain inside the core were experimentally confirmed using this method. Finally, the neutron Bragg-edge imaging results and those obtained from kernel average misorientation map using electron backscattered diffraction were compared to verify the validity of the proposed method.