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

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...

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Published inMaterials Science and Engineering: A Vol. 703; pp. 27 - 36
Main Authors Tunthawiroon, Phacharaphon, Li, Yunping, Koizumi, Yuichiro, Chiba, Akihiko
Format Journal Article
LanguageEnglish
Japanese
Published Lausanne Elsevier B.V 04.08.2017
Elsevier BV
Subjects
Chromium
Co-Cr-Mo alloy
Cobalt base alloys
Crack initiation
Die cast
Die casting
Dies
Fatigue cracks
Fatigue life
Fatigue tests
Fracture mechanics
Grain boundaries
High temperature
Metal fatigue
Molybdenum
Nucleation
Oxidation
Strain
Thermal fatigue
Tooling
Thermal fatigue
Oxidation
Co-Cr-Mo alloy
Die cast
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Summary: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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.07.047