Comparison of microstructure and hardness between high-carbon and high-nitrogen martensites

Toshihiro Tsuchiyama, Kurato Inoue, Katsutoshi Hyodo, Daichi Akama, Nobuo Nakada, Setsuo Takaki, Tamotsu Koyano

    研究成果: Contribution to journalArticle査読

    6 被引用数 (Scopus)

    抄録

    The microstructure and hardness of martensite in Fe-C and Fe-N alloys with up to 7.5 at% contents of carbon and nitrogen, respectively, were compared. Their difference in hardness was discussed based on four strengthening mechanisms. The martensitic structures of Fe-C and Fe-N alloys with equal contents of carbon and nitrogen, respectively, were nearly identical, except for the amount of retained austenite. Furthermore, Fe-C alloy was considerably harder than Fe-N alloy. This discrepancy gradually increased with carbon and nitrogen contents. The enhanced hardness of Fe-C alloy martensite was attributed to its higher dislocation density and the stronger pinning force of interstitial carbon atoms on dislocations.

    本文言語英語
    ページ(範囲)161-168
    ページ数8
    ジャーナルisij international
    59
    DOI
    出版ステータス出版済み - 1 2019

    All Science Journal Classification (ASJC) codes

    • 材料力学
    • 機械工学
    • 金属および合金
    • 材料化学

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