Improvement in punching properties of high tensile strength steel sheet by heat-treatments for reduction of center segregation

Kota Sakumoto, Kazuhiko Yamazaki, Takashi Kobayashi, Shinsuke Suzuki

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

3 Citations (Scopus)

Abstract

We investigated punching properties (crack in punched surface and hole expansion ratio) of high tensile strength steel sheets with and without center segregation. High strength steel sheets were heat-treated to reduce center segregation. Tensile strength, shear surface ratio, depth of rollover and burr height were measured on heat-treated steel sheets to confirm the effect of heat-treatment on strength. The EPMA analysis showed that the center segregation of Mn was reduced by the diffusion during heat-treatment. Crack-formation frequency and hole expansion ratio were also measured. As a result, the center segregation of Mn in high tensile strength steel sheets decreased by the heat-treatment (600 deg;C for 100 h) with maintaining the tensile strength, the depth of rollover and the burr height. The crack-formation frequency of the steel sheets decreased through heat-treatments.

Original languageEnglish
Title of host publicationMetal Forming 2014
EditorsFabrizio Micari, Livan Fratini
PublisherTrans Tech Publications Ltd
Pages1075-1080
Number of pages6
ISBN (Electronic)9783038351931
DOIs
Publication statusPublished - 2014 Jan 1
Event15th International Conference on Metal Forming 2014 - Palermo, Italy
Duration: 2014 Sep 212014 Sep 24

Publication series

NameKey Engineering Materials
Volume622-623
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Conference

Conference15th International Conference on Metal Forming 2014
CountryItaly
CityPalermo
Period14/9/2114/9/24

Keywords

  • Center segregation
  • High tensile steel sheet
  • Hole expansion ratio
  • Punching

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Sakumoto, K., Yamazaki, K., Kobayashi, T., & Suzuki, S. (2014). Improvement in punching properties of high tensile strength steel sheet by heat-treatments for reduction of center segregation. In F. Micari, & L. Fratini (Eds.), Metal Forming 2014 (pp. 1075-1080). (Key Engineering Materials; Vol. 622-623). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/KEM.622-623.1075