| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Coatings and Surface Engineering for Environmental Protection III
|
| Presentation Title |
Dealloying and Passivation of Cu-doped Carbide-reinforced Martensitic Steels in a Sulfuric Acid |
| Author(s) |
Kenta Yamanaka, Manami Mori, Kazuo Yoshida, Kazuyo Omura, Yusuke Onuki, Shigeo Sato, Akihiko Chiba |
| On-Site Speaker (Planned) |
Kenta Yamanaka |
| Abstract Scope |
High-speed steels, which consist of a martensitic matrix and numerous carbide precipitates, have been used as die and tool materials, because of their high hardness and excellent wear resistance. However, the corrosion resistance of such steels are generally not sufficient for specific applications . In the previous study, we developed Cu-doped Fe-Cr-W-C-based martensitic steels and demonstrated high hardness and excellent corrosion resistance simultaneously. Here, to understand the corrosion mechanism of the developed steel, the dealloying behavior at the surface of the steel in a sulfuric acid solution was investigated. The bulk Cr contents and higher quenching temperature increased the Cr contents in the martensitic matrix, decreasing the corrosion rate. Nonetheless, the enhanced corrosion resistance was associated with an accelerated dissolution of Cr2O3 film, which created the protective Cu-enriched layer and Fe2O3 phase at the surface. The relationship between the surface state and bulk microstructure of the steels is also discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Other |