You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass

    Co-Cr-Mo Alloys Used in Metal-Metal Bearing Surfaces

    Published: 01 January 1998

      Format Pages Price  
    PDF (368K) 14 $25   ADD TO CART
    Complete Source PDF (6.5M) 277 $65   ADD TO CART

    Cite this document

    X Add email address send
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word


    The microstructure, crystallography, mechanical properties and tribological properties of an ASTM Standard Specification for Thermomechanically Processed Cobalt-Chromium-Molybdenum Alloy for Surgical Implants (F1537-94) were studied in this work. The effects of room temperature compression and carbon content on the above characteristics were also analyzed. Increasing amounts of deformation resulted in a decrease in the number of annealing twins in the microstructure. Also observed was an increase in the volume fraction of the hexagonal-closed-packed phase from the metastable face-centered cubic phase due to a strain-induced transformation. The higher carbon alloy had a lower volume fraction of this strain-induced phase. When subjected to mechanical testing, the low carbon and high carbon alloys exhibited an increase in both the yield strength and ultimate tensile strength with increasing amounts of deformation. In addition, the low carbon alloy experienced higher amounts of work hardening in comparison to the high carbon alloy. Friction studies conducted on these alloys revealed a higher coefficient of friction for the higher carbon alloy and no significant effect of strain-induced transformation on the friction characteristics.


    carbides, face-centered-cubic, friction coefficient, hexagonal-closed-packed, neutron diffraction, strain-induced transformation, strength, twins, wear

    Author Information:

    Varano, R
    M. Eng. Student and Ass. Prof., McGill University, Montreal, Quebec

    Yue, S
    M. Eng. Student and Ass. Prof., McGill University, Montreal, Quebec

    Bobyn, JD
    Ass. Prof., Jo Miller Orthopaedic Research Laboratory, Montreal General Hospital, Montreal, Quebec

    Medley, JB
    Ass. Prof., University of Waterloo, Waterloo, Ontario

    Committee/Subcommittee: F04.93

    DOI: 10.1520/STP12830S