Ultrahigh strength ferrous sintered components

Osamu Furukimi, Koji Yano, Shigeaki Takajo

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)


    Compacts made from a newly developed composite-type alloy steel powder with 2%Ni and 1%Mo show superior mechanical properties after heat treatment. The case-hardened compacts exhibit a tensile strength of 1500MPa, absorbed energy of 21J, rotating bend fatigue strength of 460MPa and a compact fatigue strength of 2530MPa. The levels exceed the corresponding values for compacts made from a conventional 4%Ni-0.5%Mo-1.5%Cu steel powder, which are 1380 MPa, K 20J, 410MPa and 2430MPa, respectively. Double-pressed, double-sintered, bright-quenched and tempered compacts made from the new powder posses ultrahigh tensile strength of 1920MPa with high absorbed energy of 35J. The extraodrinary strengthening is attributed to the strain-induced transformation of Ni-rich austenite to martensite. In the sintered and heat-treated compacts made from the new powder, the austenite transforms almost completely to martensite under stress.

    Original languageEnglish
    JournalInternational Journal of Powder Metallurgy (Princeton, New Jersey)
    Issue number4
    Publication statusPublished - Oct 1991

    All Science Journal Classification (ASJC) codes

    • Metals and Alloys
    • Industrial and Manufacturing Engineering


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