Fabrication of gas atomized Co-Cr-Mo alloy powder and microstructure of the hot-pressed compacts

Yoshimi Sato, Naoyuki Nomura, Shigeo Fujinuma, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Co-29Cr-6Mo alloy powder was fabricated by the gas atomizing process on the compacts were hot pressed at 1273 K to 1465 K with an applied pressure of 40 MPa for 7.2 ks. The atomized alloy powder possesses relatively small concentration scattering of chromium and molybdenum. The powder dominantly consists of fcc phase. The compacts hot pressed at 1273 K possess the relative density of 92%, meanwhile the compacts with high relative density (>98%) are obtained by sintering above 1323 K. The grain size of the compacts tends to increase with increasing sintering temperature. The σ phase in the fee matrix are observed in the compacts hot-pressed at 1273 K and 1323 K. Twins and stacking fault are observed and the σ phase disappear in the compacts hot-pressed over 1323 K. The compact hot-pressed at 1323 K shows the highest hardness value (374 Hv), resulting from the existence of the σ phase in the compact.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume70
Issue number4
DOIs
Publication statusPublished - 2006 Apr
Externally publishedYes

Keywords

  • Cobalt-chromium-molybdenum alloy compact
  • Cobalt-chromium-molybdenum alloy powder
  • Gas atomization
  • Hot-pressing
  • Stacking fault
  • Twin

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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