Mechanical Alloying of Premixed δ and γ Stainless Steel Powders with a Tie Lined Chemical Compositions

Yuuji Kimura, Masatomo Kamada, Setsuo Takaki

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    2 Citations (Scopus)


    Mechanical alloying process of the mixture of ferritic(δ) and austenitic(γ) stainless steel powders has been investigated by means of X-ray diffraction and EPMA line analysis. The chemical compositions of δ and γ powders used is Fe-27mass%Cr-7mass%Ni and Fe-20mass%Cr-12mass%Ni, respectively, which are equilibrium compositions of δ and γ phase at 1473K. The γ phase in the premixed (δ+γ) powders changes to bcc phase with ballmilling treatment and this phase change is promoted by increasing the volume fraction of δ powder. The structure of γ -70vol%δ premixed powder is of full bcc single phase after 360ks ball-milling treatment. However, EPMA line analysis in premixed (δ+γ) powders with 360ks ball-milling treatment shows the inhomogeneity of the chemical composition of Cr and Ni, while the structure is of bcc single phase. The inhomogeneity of chemical composition is deeply related to the phase transformation of γ. The structural change to bcc phase is mainly due to the deformation induced transformation of γ to bcc martensite and partially due to the mechanical alloying at the interface between δ and γ phase.

    Original languageEnglish
    Pages (from-to)315-319
    Number of pages5
    JournalJournal of the Japan Society of Powder and Powder Metallurgy
    Issue number3
    Publication statusPublished - 1993

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Industrial and Manufacturing Engineering
    • Metals and Alloys
    • Materials Chemistry


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