Effect of the heat treatment on corrosion and mechanical properties of CoCrMo alloys manufactured by selective laser melting
ISSN: 1355-2546
Article publication date: 16 October 2018
Issue publication date: 18 October 2018
Abstract
Purpose
This study aims to focus on the heat treatment influence on the corrosion resistance, adhesion of Streptococcus mutans and mechanical properties of CoCrMo alloys manufactured by the selective laser melting (SLM).
Design/methodology/approach
CoCrMo alloys were manufactured using the Dimetal-100 machine. X-ray diffraction (XRD), metallographic analysis, scanning electron microscopy (SEM), electrochemical corrosion, Vickers microhardness and tensile tests were used to characterize SLM-produced CoCrMo alloys and compare them with the ones manufactured by casting and with the ASTM F75 standard.
Findings
The electrochemical results showed that SLM900 samples had the best corrosion resistance in artificial saliva. The adhesion results showed least propagation and overall quantity of Streptococcus mutans on the SLM900 sample. The microhardness, tensile and yield strength of As-SLM, SLM900 and SLM1200D samples were measured according to the ASTM F75 standard. The elongation of SLM900 was less than 8 per cent, which does not meet the standard specifications. Analysis of the fracture morphology showed that the fracture mechanisms of As-SLM and SLM1200D belong to the quasi-cleavage fracture type, and the mechanical fracture mechanism of SLM900 can be characterized as brittle fracture.
Originality/value
This paper presents the adhesion properties of Streptococcus mutans on the surface of CoCrMo alloys manufactured by SLM and proposes how to regulate the effect of the heat treatment on the corrosion resistance and mechanical properties of CoCrMo alloys manufactured by SLM.
Keywords
Acknowledgements
This study was funded by the National Natural Science Foundation of China (NSFC, No. 51705160), Guangdong Province Science and Technology Project (2017B090912002, 2017A030313271, 2015B090920002), GuangZhou Province Science and Technology Project (201704020118) and Research Funds for the Central Universities (2017BQ072).
Citation
Zhang, M., Yang, Y., Song, C., Bai, Y. and Xiao, Z. (2018), "Effect of the heat treatment on corrosion and mechanical properties of CoCrMo alloys manufactured by selective laser melting", Rapid Prototyping Journal, Vol. 24 No. 7, pp. 1235-1244. https://doi.org/10.1108/RPJ-10-2017-0215
Publisher
:Emerald Publishing Limited
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