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Meeting

2026 TMS Annual Meeting & Exhibition

Symposium

Late News Poster Session

Presentation Title

E-41: Effect of Cu on the Microstructure and Fracture Toughness of Quenched Martensitic Steel

Author(s)

Sijia Wu, Junya Inoue, Rintaro Ueji

On-Site Speaker (Planned)

Sijia Wu

Abstract Scope

The electric arc furnace (EAF) steelmaking process reduces CO₂ emissions by using steel scrap, but Cu contamination limits its use in high-quality steels. This study aims to improve the Cu tolerance of high-strength martensitic steels to expand EAF application in automotive materials. A clear contrast was found between quenched and tempered martensite. In tempered martensite, Charpy impact energy drops sharply when the Cu content exceeds 0.2 wt% due to Cu precipitation after tempering. In contrast, quenched martensite demonstrates a gradual increase in Charpy impact energy with increasing Cu content. Fractographic observations reveal a clear decrease in the fraction of cleavage surfaces with increasing Cu content. These results indict that Cu in solid solution promotes plastic deformation under impact loading. To clarify this mechanism, HR-DIC and ECCI are employed to analyze strain localization and dislocation motion, providing insights for developing Cu-tolerant martensitic steels for sustainable EAF production.

Proceedings Inclusion?

Undecided

Keywords

Copper / Nickel / Cobalt, Iron and Steel, Mechanical Properties

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