Microstructural control of dual phase structure formed by partial reversion from cold-deformed martensite

Nobuo Nakada, Yusuke Arakawa, Kyo Sun Park, Toshihiro Tsuchiyama, Setsuo Takaki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    Dual phase (DP) structure formed by partial reversion from cold-deformed martensite was investigated to improve mechanical property of DP steel by grain refinement strengthening. A low carbon martensitic steel (0.15C-1.0Mn) was cold-rolled and then held just above A1 temperature to partially form austenite. In particular, the conditions of rolling reduction (0~60% reduction in thickness) and heating rate (0.083 and 100 K/s) were varied to understand their effects on the microstructural development of DP structure. Although the recrystallization has never occurred in undeformed martensite, cold-deformed martensite was more easily recrystallized before reversion with increasing rolling reduction and lowering heating rate. Then, the matrix of DP structure was changed from tempered martensite to recrystallized ferrite, which had a large influence on the distribution of fresh martensite transformed from reversed austenite. The higher rolling reduction and heating rate resulted in the finer DP structure, leading to a large improvement in strength level.

    Original languageEnglish
    Title of host publicationRecrystallization and Grain Growth V
    PublisherTrans Tech Publications Ltd
    Pages191-194
    Number of pages4
    ISBN (Print)9783037856888
    DOIs
    Publication statusPublished - 2013
    Event5th International Conference on Recrystallization and Grain Growth, ReX and GG 2013 - Sydney, NSW, Australia
    Duration: May 5 2013May 10 2013

    Publication series

    NameMaterials Science Forum
    Volume753
    ISSN (Print)0255-5476
    ISSN (Electronic)1662-9752

    Other

    Other5th International Conference on Recrystallization and Grain Growth, ReX and GG 2013
    Country/TerritoryAustralia
    CitySydney, NSW
    Period5/5/135/10/13

    All Science Journal Classification (ASJC) codes

    • General Materials Science
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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