Relationship between microstructure and ductility of investment cast ASTM F-75 implant alloy
✍ Scribed by G�mez, M. ;Mancha, H. ;Salinas, A. ;Rodr�guez, J. L. ;Escobedo, J. ;Castro, M. ;M�ndez, M.
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 581 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0021-9304
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✦ Synopsis
Hip replacement implants fabricated using the ASTM F-75 minimized by increasing the preheating mold temperature alloy sometimes fail in a sudden catastrophic way. In general, to 1000ЊC and by using intermediate pouring temperatures fractures start at microstructural defects subjected to stress-of 1455ЊC. Under these casting conditions, however, the solidcorrosion under chemical attack by body fluids. In this paper ification rates are low, leading to large grain sizes, which, in the results of a study on the effect of casting parameters on the turn, reduce the strength of the material under dynamic microstructure of ASTM F-75 are presented. The preheating loading conditions. The volume fraction of the M 23 C 6 mold temperature and the liquid temperature were varied ''blocky'' carbides appears to be independent of the casting between 900 and 1000ЊC, and 1410 and 1470ЊC, respectively. conditions; however, their size and spatial distributions de-Optimum static strength and ductility were obtained when termine the strength of the as-cast alloys. ᭧ 1997 John Wiley & shrinkage microporosity and the volume fraction of M 23 C 6 Sons, Inc.
''eutectic'' carbides precipitated at grain boundaries were *To whom correspondence should be addressed.