SYMPOSIA PAPER Published: 01 January 1987

Effect of Hot Isostatic Pressing on the Mechanical and Corrosion Properties of a Cast, Porous-Coated Co-Cr-Mo Alloy


The corrosion properties of a cast Co-Cr-Mo alloy were evaluated using anodic and cathodic polarization techniques. These data were compared with those for a Co-Cr-Mo alloy which had been exposed to a porous coating thermal cycle, both with and without a subsequent hot isostatic pressing (HIP) procedure. The thermal exposure during sintering was found to result in the formation of grain boundary precipitates and porosity, accompanied by a reduction in elemental segregation. This resulted in a reduction in mechanical properties, as well as an increase in corrosion resistance. The use of a HIP cycle, subsequent to sintering, provided an increase in both mechanical properties and corrosion resistance. The improvement in corrosion resistance was attributed to a further reduction in elemental segregation, in comparison with the as-sintered condition.

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Georgette, FS
Richards Medical Co., Memphis, TN
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Developed by Committee: F04
Pages: 31–46
DOI: 10.1520/STP25219S
ISBN-EB: 978-0-8031-5015-7
ISBN-13: 978-0-8031-0965-0