Prediction method of voids distribution in the punched surface of the spheroidizing annealed medium carbon steel sheet by the scrap

Ken Saito, Chikara Inoue, Kazuhiko Yamazaki, Sota Goto, Shinsuke Suzuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationMS and T 2019 - Materials Science and Technology 2019
PublisherMaterials Science and Technology
Pages929-937
Number of pages9
ISBN (Electronic)0873397703, 9780873397704
DOIs
Publication statusPublished - 2019
EventMaterials Science and Technology 2019, MS and T 2019 - Portland, United States
Duration: 2019 Sep 292019 Oct 3

Publication series

NameMS and T 2019 - Materials Science and Technology 2019

Conference

ConferenceMaterials Science and Technology 2019, MS and T 2019
CountryUnited States
CityPortland
Period19/9/2919/10/3

Keywords

  • Blanking
  • Hole expansion
  • Punching
  • Spheroidizing annealed medium carbon steel
  • Stretch-flangeability
  • Void initiation

ASJC Scopus subject areas

  • Materials Science(all)

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  • Cite this

    Saito, K., Inoue, C., Yamazaki, K., Goto, S., & Suzuki, S. (2019). Prediction method of voids distribution in the punched surface of the spheroidizing annealed medium carbon steel sheet by the scrap. In MS and T 2019 - Materials Science and Technology 2019 (pp. 929-937). (MS and T 2019 - Materials Science and Technology 2019). Materials Science and Technology. https://doi.org/10.7449/2019/MST_2019_929_937