Effect of Cu addition on phase transformation and microstructure in 9 mass% Cr martensitic steels

Yuichi Futamura, Toshihiro Tsuchiyama, Setsuo Takaki

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    5 Citations (Scopus)

    Abstract

    Effect of Cu addition on microstructure was investigated in Fe-Cr-Cu martensitic alloys by means of optical and transmission electron microscopy, and X-ray diffractometry. Lath-martensitic single structure can be obtained in 9 mass%-Cu steels water-quenched from the solution treatment temperature of 1273 K. The morphology of martensite-laths is independent of Cu content in the steels with 4 mass% Cu or less. Dislocation density in martensitic structure, however, is enhanced with increasing Cu content. On the solution treatment, Cu atoms markedly segregate at austenite grain boundary, and the Cu content increases to about 50 at% (53 mass%) in the case of 9 mass%Cr-4 mass%Cu steel. This results in the retardation of grain growth of austenite at the solution treatment temperature probably due to the grain boundary dragging effect by Cu atoms and/or the decrease in grain boundary energy. The austenite grain refining by Cu addition also causes the refining of substructure within prior austenite grains; martensite-block and -packet structure.

    Original languageEnglish
    Pages (from-to)697-702
    Number of pages6
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Volume85
    Issue number9
    DOIs
    Publication statusPublished - 1999

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry

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