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

B. P. Conroy, D. A. Tanner

Research output: Contribution to journalArticlepeer-review

Abstract

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. This paper is part of a Themed Issue on Measurement, modelling and mitigation of residual stress.

Original languageEnglish
Pages (from-to)1411-1426
Number of pages16
JournalMaterials Science and Technology (United Kingdom)
Volume32
Issue number14
DOIs
Publication statusPublished - 21 Sep 2016

Keywords

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

Fingerprint

Dive into the research topics of 'Determination of residual stress within complex-shaped coarse-grained cobalt–chromium biomedical castings'. Together they form a unique fingerprint.

Cite this