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Microstructure and Mechanical Properties of Heat-Treated Co-20Cr-15W-10Ni Alloy for Biomedical Application

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Abstract

The microstructure and mechanical properties of a heat-treated biomedical ASTM F90 Co-20Cr-15W-10Ni (mass pct) alloy were investigated. The alloy was heat-treated at temperatures of 673 K to 1623 K (400 °C to 1450 °C) for holding times of 0.6 to 259.2 ks. The formation of M23X6-type (M: metallic element and X: C and N) and η-phase (M6X-M12X type) precipitates was detected in the heat-treated alloys using a combination of electrolytic extraction and X-ray diffraction. The formation of precipitates deteriorated the ductility of the heat-treated alloys. On the other hand, both the tensile strength and elongation were improved by heat treatment at low temperatures of 673 K to 873 K (400 °C to 600 °C). In this heat-treated alloy, the density of stacking faults was higher than that of the as-received alloy, and the formation of the ε-phase was detected.

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Abbreviations

BSE:

Backscattered electron

EBSD:

Electron backscatter diffraction

SEM:

Scanning electron microscopy

TRIP:

Transformation-induced plasticity

XRD:

X-ray diffraction

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Acknowledgment

This study was financially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, under Contract No. 25249094.

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Authors and Affiliations

  1. Department of Materials Processing, Tohoku University, 6-6-02, Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan

    Kosuke Ueki (Student), Kyosuke Ueda (Associate Professor) & Takayuki Narushima (Professor)

Authors
  1. Kosuke Ueki
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  2. Kyosuke Ueda
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  3. Takayuki Narushima
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Correspondence to Kosuke Ueki.

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Manuscript submitted October 2, 2015.

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Ueki, K., Ueda, K. & Narushima, T. Microstructure and Mechanical Properties of Heat-Treated Co-20Cr-15W-10Ni Alloy for Biomedical Application. Metall Mater Trans A 47, 2773–2782 (2016). https://doi.org/10.1007/s11661-016-3488-5

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