SYMPOSIA PAPER Published: 01 January 1999

The Production and Properties of Wrought High Carbon Co-Cr-Mo Alloys


The medical implant market's requirement for a forged version of the normally cast only, high carbon (approximately 0.2%) variant of the Co-Cr-Mo alloy, which would combine increased wear resistance with the mechanical properties of the low carbon (approximately 0.05%) variant of Co-Cr-Mo, initiated an investigation to establish a viable manufacturing route for the high carbon variant. Initially, a single melted (vacuum induction melted) cast and forged route, and a metal spraying process were examined. Subsequently a vacuum induction melted, electroslag remelted and hot working route was developed using a number of compositional and thermo mechanical processing variants. The mechanical properties obtained on rolled and forged high carbon Co-Cr-Mo bar from 20mm to 50mm diameter were similar to those of the low carbon variant and also met the requirement of ASTM F1537-94 (warm worked). The wear resistance of the high carbon variant, measured using a pin on disc method, indicated some advantage over the low carbon variant at high applied loads.

Author Information

Berry, G
Firth Rixson Superalloys Ltd, Glossop, Derbyshire, UK
Bolton, JD
University of Bradford, West Yorkshire, UK
Brown, JB
Firth Rixson Superalloys Ltd, Glossop, UK
McQuaide, S
California Polytechnic State University, College of Engineering, San Luis Obispo, CA, USA
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Developed by Committee: F04
Pages: 11–31
DOI: 10.1520/STP14260S
ISBN-EB: 978-0-8031-5409-4
ISBN-13: 978-0-8031-2608-4