Microstructure evolutions at severely-deformed austenite/martensite interfaces of a layer-integrated steel

Taisuke Hayashi, Eiji Abe, Toru Hara, Ikuhara Yuichi

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The microstructure evolution at interfaces of a layer-integrated steel sheet artificially constructed by ductile austenitic stainless (SUS304) and high-strength martensitic (SCM415) steel layers, which were bonded through a cold-rolling and a subsequent annealing at 1 000°C, has been investigated using scanning transmission electron microscopy (STEM) combined with energy dispersive X-ray spectroscopy (EDS). We find that a significant microstructural reconstruction around the SUS304/SCM415 interface has been accomplished during a short-time annealing followed by water-quenching; the resultant microstructures are found to consist of recrystallized austenite and lath martensite grains for the SUS304 and SCM415 layers, respectively. Interestingly, the original SUS304/SCM415 interface appears to migrate and extend into the SUS304 side, an occurrence of which can be reasonably explained by the martensitic transformation across the composition-gradient interface during quenching. These microstructural evolutions fairly account for a microscopic mechanism on how hetero-interface bonding can be achieved via simple cold-rolling/annealing procedures.

    Original languageEnglish
    Pages (from-to)1406-1413
    Number of pages8
    JournalIsij International
    Volume49
    Issue number9
    DOIs
    Publication statusPublished - 2009 Dec 1

    Keywords

    • Interface structure
    • Phase transformation
    • Scanning transmission electron microscopy
    • Severe plastic deformation
    • Steels

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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