Abstract
The machinability of hard-to-cut CoCr alloys manufactured by Selective Laser Melting (SLM) technology is not yet sufficiently studied. Therefore, this work focuses on evaluation of surface texture formation during face turning of CoCr alloy. As part of the research, two specimen types were subject to comparison: made with the application of conventional casting and manufactured by additive manufacturing—SLM. A number of analytical and experimental methods were employed to describe the specimen composition and morphology, as: X-Ray Diffraction Analysis (XRD), optical metallurgical microscopy, confocal optical microscopy, and Vickers hardness HV0.1 measurements. In the next stage, the measurements of surface topographies formed during turning in a range of variable cutting speeds and feeds were carried out. Ultimately the multi-factor MANOVA (Multivariate Analysis of Variance) illustrating the influence of manufacturing technology, cutting speed, and feed ratio on selected surface parameters of samples was made. It has been demonstrated that during face turning with feeds up to 0.15 mm/rev, the similar values of surface roughness height and material ratio curve parameters were reached for both tested CoCr alloys. However, in a range of higher feed values, the surface quality of CoCr samples fabricated by SLM was lower than that reached for CoCr after casting process.
Highlights
Cobalt chromium alloys are acknowledged as attractive materials in the application of many engineering fields
In this work an evaluation of surface texture formed during turning of CoCr alloys fabricated by casting and selective laser melting (SLM) processes was made
Physical-mechanical characterization and multifactorial analysis of variance (MANOVA) related to machined surfaces, in order to evaluate the influence of technological cutting parameters and sample fabrication technique
Summary
Cobalt chromium alloys are acknowledged as attractive materials in the application of many engineering fields. Shokrani et al [1] listed applications of these materials in aero-engine and gas turbine parts due to their good corrosion resistance and high temperature strength. Noted that CoCr alloys apart from their high biocompatibility have greater strength and better wear resistance than Ti alloys, they are used in hip replacements. Pieniażek et al [4] indicated that the wide use of these alloys in biomedicine is due to the fact that they do not contain elements harmful for the human body, such as nickel or beryllium, which according to [5] allows for long-term incorporation in the human musculoskeletal system. Next to orthopedic implantology, CoCr alloys are widely used in prosthetics and dental implantology
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