Martensite Transformation Start Temperature During Quench and Austempering in Fe-8Ni-0.2C Alloys

Hiroyuki Kawata, Kunio Hayashi, Chisato Wakabayashi, Naoki Yoshinaga, Manabu Takahashi

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)


It is important for the improvement of mechanical properties of quenching and partitioning (QP) steels to control the martensite transformation behavior and the stability of untransformed austenite. In this study, we evaluated the martensite transformation restart temperature (Mr) via a dilatometer during the reheat austempering pattern. This heat pattern corresponding to the typical heat treatment for QP steel involves quenching to TQ, a temperature between the martensite transformation start temperature (Ms) and the finish temperature, and austempering above Ms. In Fe-8Ni-0.2C alloy, Mr equals TQ, regardless of the progress of bainite transformation during austempering at 673 K (400 °C). In Fe-8Ni-1Si-0.2C alloy, Mr decreases parabolically from TQ with the progress of bainite transformation, and this behavior corresponds to the assumed carbon concentration by bainite transformation. These results indicate that the self-stabilization of the entire untransformed austenite during the first quench from Ms to TQ was preserved, regardless the bainite transformation. Moreover, the stabilization by the carbon concentration in untransformed austenite was added to this self-stabilization.

ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
出版ステータス出版済み - 4月 2021

!!!All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 材料力学
  • 金属および合金


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