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 language | English |
|---|---|
| Pages (from-to) | 331-337 |
| Number of pages | 7 |
| Journal | Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan |
| Volume | 104 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2018 Jun |
| Externally published | Yes |
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