Metallurgical and Materials Transactions A

, Volume 49, Issue 6, pp 2393–2404 | Cite as

Microstructural Changes During Plastic Deformation and Corrosion Properties of Biomedical Co-20Cr-15W-10Ni Alloy Heat-Treated at 873 K

  • Kosuke Ueki
  • Kyosuke Ueda
  • Masaaki Nakai
  • Takayoshi Nakano
  • Takayuki Narushima
Article
  • 112 Downloads

Abstract

Microstructural changes were observed during the plastic deformation of ASTM F90 Co-20Cr-15W-10Ni (mass pct) alloy heat-treated at 873 K (600 °C) for 14.4 ks, and analyzed by electron backscatter diffraction and in situ X-ray diffraction techniques. The obtained results revealed that the area fraction of the ε-phase (f ε ) in the as-received alloy was higher than that in the heat-treated alloy in the low-to-middle strain region (≤ 50 pct), whereas the f ε of the heat-treated alloy was higher than that of the as-received alloy at the fracture point. During plastic deformation, the ε-phase was preferentially formed at the twin boundaries of the heat-treated alloy rather than at the grain boundaries. According to the transmission electron microscopy observations, the thin ε-phase layer formed due to the alloy heat treatment acted as the origin of deformation twinning, which decreased the stress concentration at the grain boundaries. The results of anodic polarization testing showed that neither the heat treatment at 873 K (600 °C) nor plastic deformation affected the alloy corrosion properties. To the best of our knowledge, this is the first study proving that the formation of a thin ε-phase layer during the low-temperature heat treatment of the studied alloy represents an effective method for the enhancement of the alloy ductility without sacrificing its strength and corrosion properties.

Notes

Acknowledgment

This study was financially supported by the Japan Society for the Promotion of Science KAKENHI (Grant Number JP 16J04279).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Kosuke Ueki
    • 1
  • Kyosuke Ueda
    • 1
  • Masaaki Nakai
    • 2
  • Takayoshi Nakano
    • 3
  • Takayuki Narushima
    • 1
  1. 1.Department of Materials ProcessingTohoku UniversitySendaiJapan
  2. 2.Department of Mechanical EngineeringKindai UniversityHigashiōsakaJapan
  3. 3.Division of Materials Science and EngineeringOsaka UniversityOsakaJapan

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