Effect of phase transformation on tensile behavior of Co-Cr-Mo alloy fabricated by electron-beam melting

Shi Hai Sun, Yuichiro Koizumi, Shingo Kurosu, Yun Ping Li, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

High temperature tensile property and phase transformation of Co-28Cr-6Mo-0.23C-0.17N alloy rods fabricated by electron-beam melting (EBM) with cylinder axes along build direction was investigated. Single-crystal like γ-fcc grain structure can be obtained by EBM. Although constituent phase varied along the build direction in the as-EBM-built rod, from single ε-hcp phase in the bottom to single γ-fcc phase in the top, γ-fcc phase can be kept in a wide range of build height, i.e. about 40 mm from the top finishing plane. ε-hcp grains in the bottom of the rods obtained in the EBM process mostly had preferential orientations. The rods can be transformed into single ε-hcp phase by the aging treatment at 800 °C for 24 h, and ε-hcp phase in the top of the rods obtained by aging heat treatment exhibited diffusion transformation. The yield strength and ultimate tensile strength (UTS) of the top part was higher than that of the bottom part, though the plastic elongation of the top part was a little lower than that of the bottom part.

Original languageEnglish
Pages (from-to)234-242
Number of pages9
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume61
Issue number5
DOIs
Publication statusPublished - 2014 May 1

Keywords

  • Cobalt chromium alloys
  • Electron-beam melting
  • Phase transformation
  • Powder processing
  • Tensile

ASJC Scopus subject areas

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

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