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Meeting Materials Science & Technology 2019
Symposium Formability and Fracture of Metal Sheets
Presentation Title P3-90: Prediction Method of Voids Distribution in the Punched Surface of the Spheroidizing Annealed Medium Carbon Steel Sheet by the Scrap
Author(s) Ken Saito, Chikara Inoue, Kazuhiko Yamazaki, Sota Goto, Shinsuke Suzuki
On-Site Speaker (Planned) Ken Saito
Abstract Scope Several studies have reported that voids near punched surface decrease stretch flange formability. However, non-destructive observation of voids near punched surface before hole expanding is difficult. Therefore, the authors assumed that the voids distribution in a thickness direction of blank (holder side) is point symmetrical with that of scrap (hole side). The objective of this study was to investigate validity of the assumption and establishing the prediction method of voids distribution near punched surface. After punching a spheroidizing annealed medium carbon steel sheet, voids near punched surface were measured. The distribution of the number density of voids in a thickness direction between scrap and blank had slight deviation in a thickness direction. The area fraction of voids of the scrap was higher than that of the blank. However, as these differences showed systematic tendencies, the voids distribution in a blank can be predicted through evaluation of its corresponding scrap.
Proceedings Inclusion? Definite: At-meeting proceedings


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P3-90: Prediction Method of Voids Distribution in the Punched Surface of the Spheroidizing Annealed Medium Carbon Steel Sheet by the Scrap
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