Determination of Johnson-Cook plasticity model parameters for CoCrMo alloy

O’Toole, Lorcan; Haridas, Ravi Sankar; Mishra, Rajiv S.

doi:10.1016/j.mtcomm.2022.105128

Cited by 2 publications

(1 citation statement)

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“…Mischler and Muñoz [ 69 ] considered a value of E (elastic modulus) of 248 GPa for a Co-Cr-Mo alloy. More recently, O’Toole et al [ 70 ] reported that a Young’s modulus of 210 GPa was far higher than that for a human leg or arm cortical bone, for which the Young’s modulus is less than 20,000 MPa [ 71 ]. Comparing the values found in this work with previous studies, the Young’s modulus of this alloy can be considered safe for implant applications.…”

Section: Resultsmentioning

confidence: 99%

Scratch and Wear Behaviour of Co-Cr-Mo Alloy in Ringer’s Lactate Solution

et al. 2023

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Cobalt–chromium–molybdenum (Co-Cr-Mo) alloy is a material recommended for biomedical implants; however, to be suitable for this application, it should have good tribological properties, which are related to grain size. This paper investigates the tribological behaviour of a Co-Cr-Mo alloy produced using investment casting, together with electromagnetic stirring, to reduce its grain size. The samples were subjected to wear and scratch tests in simulated body fluid (Ringer’s lactate solution). Since a reduction in grain size can influence the behaviour of the material, in terms of resistance and tribological response, four samples with different grain sizes were produced for use in our investigation of the behaviour of the alloy, in which we considered the friction coefficient, wear, and scratch resistance. The experiments were performed using a tribometer, with mean values for the friction coefficient, normal load, and tangential force acquired and recorded by the software. Spheres of Ti-6Al-4V and 316L steel were used as counterface materials. In addition, to elucidate the influence of grain size on the mechanical properties of the alloy, observations were conducted via scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD). The results showed changes in the structure, with a reduction in grain size from 5.51 to 0.79 mm. Using both spheres, the best results for the friction coefficient and wear volume corresponded to the sample with the smallest grain size of 0.79 mm. The friction coefficients obtained were 0.37 and 0.45, using the Ti-6Al-4V and 316L spheres, respectively. These results confirm that the best surface finish for Co-Cr-Mo alloy used as a biomedical implant is one with a smaller grain size, since this results in a lower friction coefficient and low wear.

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Section: Resultsmentioning

confidence: 99%