Effect of Cooling Rate on Microstructure and Mechanical Properties of Cobalt-Chrome-Molybdenum Alloy
Cobalt-chromium-molybdenum alloy is the most widely used metallic material for bone and joint implants owing to its outstanding biocompatibility and wear resistance.In this work,the impacts of heat treatment processes with different cooling rates of air cooling,air blast cooling,water cooling,air quenching after treated with the regime of 1150 ℃ for 2 h on the microstructures and mechanical properties of cobalt-Cr-Mo alloys were studied.The results demonstrated that with the increase of cooling rate,the carbide strengthening phases of the Co-Cr-Mo alloys became markedly finer and more dispersive in the matrixes,and both the strength and plasticity of the material were remarkably enhanced.Under the conditions of keeping 1150 ℃ for 2 h in vaccum and the argon cooling rate of 150 ℃/min,the tensile strength,yield strength and elongation of the specimen reached 889 MPa,585 MPa and 13％,respectively.
cobalt-chrome-molybdenum alloyheat treatmentcooling ratevacuum gas quenching
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