Ultrahigh strength ferrous sintered components

Osamu Furukimi, Koji Yano, Shigeaki Takajo

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Abstract

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)
Volume27
Issue number4
Publication statusPublished - Oct 1 1991

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All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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