|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Advanced Biomaterials
||Effect of Rapid Solidification on the Microstructure of a Biomaterial Co-Cr-Mo-C Alloy
||Hugo F Lopez, Hamid-Reza Erfanian-Naziftoosi
|On-Site Speaker (Planned)
A Co-Cr-Mo-C biomedical grade alloy was cast using a rapid solidification wedge V-shaped copper and sand molds under an argon gas atmosphere. Scanning electron microscopy and optical microscopy were employed to investigate the effect of rapid solidification rates on the exhibited microstructure of of the cast alloys. In addition, the amount of athermal -hcp developed via rapid solidification was determined by X-ray diffraction.. A uniform distribution of fine carbides were found to precipitate along primary and secondary dendrites arms. In particular, it is found that the dendrite structure becomes highly refined including the carbide size and carbide distribution when rapid solidification is dominant. Moreover, the exhibited amount of athermal -hcp martensite increases from 4% to over 60% by increasing the alloy solidification rates (up to 278 K/s approx).
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