Determination of residual stress within complex-shaped coarse-grained cobalt-chromium biomedical castings

作者：Conroy B P; Tanner D A^*

来源：Materials Science and Technology, 2016, 32(14): 1411-1426.

DOI：10.1080/02670836.2016.1177304

• Residual stress determination
• ASTM F75
• CoCrMo
• Investment casting
• Femoral knee implants
• Distortion
• Coarse grain structure
• Elastic anisotropy

Cast ASTM F75 femoral knee implant components distort during manufacture due to residual stress re-distribution or inducement. These castings pose a number of challenges for residual stress determination methods; they have a complex geometry, their microstructure is inhomogeneous, they work-harden rapidly and they have a coarse, elastically anisotropic grain structure. The contour method is anticipated to be the most promising residual stress determination technique. X-ray diffraction is feasible for components which have experienced plastic deformation on their surface which results in refined diffracting domains. Centre-hole drilling is feasible, but the influence of stress induced from drilling and the effect of coarse grain structure is unknown. Neutron diffraction is challenging also due to a coarse grain structure and difficult nuclear material properties.

• 出版日期2016