Abstract
As the second part of the present study, the effects of modifying the composition of the Co-Cr-Mo alloy with additions of nickel and some trace elements aluminium, titanium and boron, have been investigated. A great improvement in the fatigue crack growth resistance of the cast alloy is obtained by nickel additions to the base alloy, mainly because of a significant increase in the alloy's stacking fault energy. In addition, the fatigue fracture ductility is observed to be improved strikingly with the nickel additions. Much smaller facets and better ductility with a mixed fatigue crack propagation mode, as compared to the base alloy, are observed in the alloys with low nickel content level, and in the alloys with high nickel content level, localized ductile fatigue striations are observed. It is also indicated that minor additions of such elements as aluminium, titanium and boron can be used to improve further the fatigue crack growth resistance resulting from the elimination of some microstructural casting defects.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
