Production of Co-Cr-Mo Biomedical Alloys via Investment Casting Technique
Abstract
Co-Cr-Mo biomedical alloys with three different compositions were produced by investment casting technique from high purity constituents. The structural properties such as phase relationships, microstructures, and hardness of the alloys were studied. The phase relationships of the samples were investigated using x-ray diffraction and the microstructural characterization were performed using light optical microscopy. It was found that the microstructure of the samples was composed of Co-based dendrites (matrix phase) and carbides (second phase particles) precipitated at grain boundaries and interdendritic regions. These carbides act as strengthening particles in such alloys. Moreover, the mean hardness of these three samples were measured as 24.2, 24.5 and 29.6 HRC. The values were found to be in a good agreement with the optimum hardness value given in the ASTM F75 standards.
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URN: https://sloi.org/urn:sl:tjoee3187
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