Strain-controlled iso-thermal fatigue behavior of Co–29Cr–6Mo used for tooling materials in Al die casting

Phacharaphon Tunthawiroon, Yunping Li, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Iso–thermal (IF) fatigue behavior of a singleε-phase Co–Cr–Mo alloy used as Al die casting mold is investigated in details at temperatures of 400, 500, 600, and 700 °C and applied mechanical strains of 0.1%, 0.2%, 0.3% and 0.4%. The results indicate that for a given applied mechanical strain, higher temperature promotes the occurrence of oxidation on alloy surface, resulting in a shorter fatigue life compared to the tests at lower temperature; at a given temperature, larger applied strain amplitude gives rise to shorter fatigue life. Microstructural observation indicates that grain boundary oxidation plays a significant role for crack nucleation at high temperature. The cracks are found to initiate intergranularly and propagate in a mixed intergranular and transgranular mode.

Original languageEnglish
Pages (from-to)27-36
Number of pages10
JournalMaterials Science and Engineering A
Volume703
DOIs
Publication statusPublished - 2017 Aug 4

Keywords

  • Co-Cr-Mo alloy
  • Die cast
  • Oxidation
  • Thermal fatigue

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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