期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 46A, 期 9, 页码 4342-4350出版社
SPRINGER
DOI: 10.1007/s11661-015-3008-z
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- MEXT
- Grants-in-Aid for Scientific Research [25249094] Funding Source: KAKEN
The precipitates of biomedical Co-28Cr-6Mo-(0.5 to 2)Si-(0.05 to 0.35)C alloys (mass pct) have been investigated before and after heat treatment, focusing on the formation of the chi-phase precipitate. The precipitates were precisely and directly analyzed after using electrolytic extraction to separate the precipitates from the alloys. Heat treatment was performed at 1523 K (1250 A degrees C) for a holding time of 0.6 ks. The chi-phase precipitate was detected with Si content of 1.3 to 2 mass pct and C content of 0.05 to 0.15 mass pct in both the as-cast and heat-treated alloys. The higher Si content and the mid-level C content of about 0.15 mass pct favored the formation of the chi-phase precipitate. Moreover, the chi-phase precipitate was not observed in the compositional range of the ASTM F 75 standard: Si content a parts per thousand currency sign1.0 mass pct and C content a parts per thousand currency sign0.35 mass pct. In the as-cast Co-28Cr-6Mo-1.3Si-0.15C alloy, which is outside of the ASTM F 75 standard, the content of the chi-phase precipitate was around 6 pct in area percent; the decrease in the ductility was detected in the tensile test of this alloy. The amount of precipitates decreased due to heat treatment at 1523 K (1250 A degrees C), where the dissolution of precipitates occurred. After the heat treatment, a single chi-phase precipitate region was detected.
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