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<p>Microstructure evolution of biomedical Co-28Cr-6Mo alloy processed by radial shear rolling (RSR) with subsequent aging at different temperatures was analyzed in this study. The novelty of the study is new method of thermomechanical treatment for a Co-Cr-Mo alloy (RSR + aging), which allows to obtain a unique heterogeneous microstructure and an excellent combination of strength and ductility in the material. It was found that RSR of the alloy at a temperature of 1190&#xa0;°C in 5 passes with a total elongation ratio of 2.95 (average and maximum values were 1.24 and 1.34 per pass, respectively) resulted in the formation of a deformed ultrafine-grain microstructure, which consisted mainly of ε-hcp phase and residual γ-fcc phase. Subsequent aging in the temperature range of 850-1100&#xa0;°C led to change in the phase composition and microstructure of the alloy. The best ratio of strength and ductility was ensured after radial shear rolling and aging at 850&#xa0;°C due to the formation of a unique bimodal microstructure, which suppressed the localization of deformation during the tensile process. Following aging at 850&#xa0;°C, the ultimate tensile strength (UTS ~ 1223&#xa0;MPa) and yield strength (YS ~ 705&#xa0;MPa) were 1.3 and 1.7, respectively, in comparison with the parameters observed after RSR. The elongation to fracture (El) was 1.5 times higher and equal to ~ 35%. In addition, there was no significant change in the average grain size, which remained at 13.3&#xa0;μm.</p>

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Effect of Aging on Microstructure and Mechanical Properties of Biomedical Co-28Cr-6Mo Alloy Processed by Radial Shear Rolling

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Yury Gamin,
  • Tatiana Kin,
  • Abdullah Mahmoud Alhaj Ali,
  • Sergey Galkin

摘要

Microstructure evolution of biomedical Co-28Cr-6Mo alloy processed by radial shear rolling (RSR) with subsequent aging at different temperatures was analyzed in this study. The novelty of the study is new method of thermomechanical treatment for a Co-Cr-Mo alloy (RSR + aging), which allows to obtain a unique heterogeneous microstructure and an excellent combination of strength and ductility in the material. It was found that RSR of the alloy at a temperature of 1190 °C in 5 passes with a total elongation ratio of 2.95 (average and maximum values were 1.24 and 1.34 per pass, respectively) resulted in the formation of a deformed ultrafine-grain microstructure, which consisted mainly of ε-hcp phase and residual γ-fcc phase. Subsequent aging in the temperature range of 850-1100 °C led to change in the phase composition and microstructure of the alloy. The best ratio of strength and ductility was ensured after radial shear rolling and aging at 850 °C due to the formation of a unique bimodal microstructure, which suppressed the localization of deformation during the tensile process. Following aging at 850 °C, the ultimate tensile strength (UTS ~ 1223 MPa) and yield strength (YS ~ 705 MPa) were 1.3 and 1.7, respectively, in comparison with the parameters observed after RSR. The elongation to fracture (El) was 1.5 times higher and equal to ~ 35%. In addition, there was no significant change in the average grain size, which remained at 13.3 μm.