Structural Change in Hot-Stamped GA Coating and Influence on Corrosion Resistance by Tempering

Akihiro Sengoku, Hiroshi Takebayashi, Norihiko Okamoto, Haruyuki Inui

Research output: Contribution to journalArticlepeer-review

Abstract

Hot-stamped galvannealed steel sheets (GA) are widely applied to produce automobile components that require high strength. The hotstamped components tempered for the control of strength improve the collision property. This study investigated the structural changes in the hot-stamped GA coating and the influence on corrosion resistance by tempering. It has been revealed that by tempering between 500-600 degrees Celsius, the Fe-Zn solid-solution phase in the hot-stamped GA coating changed into two phases: The Γ phase and the Fe-Zn solid-solution phase with less Zn, and these changes in the coating structure improved the corrosion resistance. The phase decomposition is considered to result from discontinuous precipitation of the Fe-Zn supersaturated-solid-solution.

Original languageEnglish
Pages (from-to)819-826
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume105
Issue number8
DOIs
Publication statusPublished - 2019 Jan 1
Externally publishedYes

Keywords

  • Coating structure
  • Fe-zn solid-solution
  • Ga coating
  • Galvannealed coating
  • Hot-stamping
  • Lamellar structure
  • Tempering
  • Zn-fe intermetallic compound

ASJC Scopus subject areas

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

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