|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||High Performance Steels
||Simultaneous Enhancement of Hardness and Corrosion Resistance in Carbide-reinforced Martensitic Steels
||Kenta Yamanaka, Haruka Shima, Manami Mori, Kazuo Yoshida, Yusuke Onuki, Shigeo Sato, Akihiko Chiba
|On-Site Speaker (Planned)
High-speed steels, which comprise martensitic matrices and fine carbide precipitates, exhibit excellent wear resistance. However, the high fraction of carbide precipitates causes severe dissolution of the martensitic matrix in corrosive medium. Recently, we revealed that adding trace Cu significantly improves the corrosion resistance of such steel grades. In this study, to optimize the alloy design, we examined the effects of composition and heat treatments on the hardness and corrosion resistance of the alloys. The alloy’s hardness increased monotonously with increasing the carbon content. Using quantitative microstructural analyses based on neutron diffraction measurements, we demonstrated that the hardness of such steels originates dominantly from the increased dislocation density in the carbon enriched martensitic matrix rather than the volume fraction of carbides. In combination with the potentiodynamic polarization tests, an optimal composition was determined for enhanced corrosion resistance without severe degradation of corrosion resistance.
||Iron and Steel, Characterization, Environmental Effects