Effect of scan speed on corrosion and tribocorrosion properties of cobalt-chromium alloy in situ produced by selective laser melting

Abstract

Purpose This paper aims to investigate the influence of scan speed on the corrosion and tribocorrosion features of the CoCrMoW samples fabricated via the selective laser melting (SLM) process. Design/methodology/approach CoCrMoW samples were produced by SLM at different scan speeds. Produced samples were made via structural surveys (X-ray diffraction examinations and scanning electron microscopic analyses), hardness measurements and electrochemical and tribocorrosion experiments. Findings Outcomes displayed that the corrosion and tribocorrosion properties of CoCrMoW alloy were significantly influenced by scanning speeds. Also, these properties of the alloy increased with increasing scanning speeds. CoCrMoW samples produced at a laser scan speed of 1,000 mm/s showed the best resistance to corrosion and tribocorrosion. This could be related to the high hardness and low grain structure of the fabricated samples. Originality/value This paper may be a practical reference and offers insight into the effect of scanning speeds on the increase of hardness, tribological and corrosion performance of CoCrMoW alloys. This study can help in the further advancement of cobalt-chromium alloy in situ produced by SLM for both electrochemical and tribocorrosion behavior for biomedical applications.

Influence of Proteins and Building Direction on the Corrosion and Tribocorrosion of CoCrMo Fabricated by Laser Powder Bed Fusion

“…23 The corrosion evaluations of latticetype (controlled porosity) CoCrMo (0.35 wt % C) specimens for bone ingrowth fabricated with LPBF showed a relatively high corrosion resistance in simulated body fluid. 24 In a recent study, 25 the influence of scan speed on the corrosion and tribocorrosion properties of LPBF CoCrMoW samples was examined, showing that the laser scan speed could directly affect the microstructure and subsequently impact the corrosion and tribocorrosion behavior of the samples. The surface of as-printed LPBF CoCrMo is very different from abraded/polished surfaces of either LPBF or traditionally manufactured CoCrMo and has been shown to influence corrosion and biocompatibility.…”

“…The corrosion evaluations of lattice-type (controlled porosity) CoCrMo (0.35 wt % C) specimens for bone ingrowth fabricated with LPBF showed a relatively high corrosion resistance in simulated body fluid . In a recent study, the influence of scan speed on the corrosion and tribocorrosion properties of LPBF CoCrMoW samples was examined, showing that the laser scan speed could directly affect the microstructure and subsequently impact the corrosion and tribocorrosion behavior of the samples. The surface of as-printed LPBF CoCrMo is very different from abraded/polished surfaces of either LPBF or traditionally manufactured CoCrMo and has been shown to influence corrosion and biocompatibility. , LPBF CoCrMo fabricated in different building orientations (perpendicular and parallel to building direction) may or may not exhibit different corrosion behaviors, depending on the carbon content, heat treatment, and environmental conditions. , Our previous study suggested that a suitable biomedical manufacturing protocol, including low-carbon CoCrMo feed powder and a suitable heat treatment protocol, can eliminate any differences in building orientations …”