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- W2040887501 abstract "Hip replacement implants fabricated using the ASTM F-75 alloy sometimes fail in a sudden catastrophic way. In general, fractures start at microstructural defects subjected to stress-corrosion under chemical attack by body fluids. In this paper the results of a study on the effect of casting parameters on the microstructure of ASTM F-75 are presented. The preheating mold temperature and the liquid temperature were varied between 900 and 1000 degrees C, and 1410 and 1470 degrees C, respectively. Optimum static strength and ductility were obtained when shrinkage microporosity and the volume fraction of M23C6 eutectic carbides precipitated at grain boundaries were minimized by increasing the preheating mold temperature to 1000 degrees C and by using intermediate pouring temperatures of 1455 degrees C. Under these casting conditions, however, the solidification rates are low, leading to large grain sizes, which, in turn, reduce the strength of the material under dynamic loading conditions. The volume fraction of the M23C6 blocky carbides appears to be independent of the casting conditions; however, their size and spatial distributions determine the strength of the as-cast alloys." @default.
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- W2040887501 date "1997-02-01" @default.
- W2040887501 modified "2023-09-27" @default.
- W2040887501 title "Relationship between microstructure and ductility of investment cast ASTM F-75 implant alloy" @default.
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- W2040887501 doi "https://doi.org/10.1002/(sici)1097-4636(199702)34:2<157::aid-jbm3>3.0.co;2-p" @default.
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