Structural changes in galvannealed coating during hot-stamping heating

Akihiro Sengoku, Hiroshi Takebayashi, Norihiko Okamoto, Haruyuki Inui

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Hot-stamping process is widely applied to coated steel sheets including galvannealed steel sheets (GA) to produce high-strength automobile components. In this study, we investigated the structural changes in galvannealed coating during hot-stamping heating. It was revealed that the original δ1 phase decomposed to the Γ phase and Zn liquid above the peritectic temperature of the δ1 phase, then the Γ phase further decomposed to the Fe-Zn solid-solution and Zn liquid above the peritectic temperature of the Γ phase, and finally the coating changed to a single phase of the Fe-Zn solid-solution. The series of structural changes in GA coating can be explained with the Fe-Zn binary phase diagram.

Original languageEnglish
Pages (from-to)331-337
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume104
Issue number6
DOIs
Publication statusPublished - 2018 Jun

Keywords

  • Coating structure
  • Fe-Zn solid-solution
  • Galvannealed coating
  • Hot-stamping
  • Zn-Fe intermetallic compound

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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