Effect of internal pores on tensile properties of Co-Cr-Mo alloy fabricated by selective laser melting
ISSN: 1355-2546
Article publication date: 24 September 2021
Issue publication date: 26 January 2022
Abstract
Purpose
The purpose of this paper is to examine the effect of internal pores on the tensile properties of a Co–Cr–Mo alloy fabricated by selective laser melting (SLM).
Design/methodology/approach
The size and volume fraction of pores were controlled through high temperature annealing (HTA) and hot isostatic pressing (HIP).
Findings
After HTA, the size and fraction of pores decreased compared with the as-built SLM sample, and no pores were observed after HIP. Tensile tests of the HTA and HIP samples showed nearly similar tensile deformation behavior. From the results, the authors found that the size of the internal pores formed in the SLM process had little effect on the tensile properties. The as-built SLM sample had less elongation than the HTA and HIP samples, which would not the effect of porosity, but rather the effect of the residual stress and the retained ε phase after the SLM process.
Originality/value
Although pores are a main factor that influence the mechanical properties, the effect of pores on the tensile properties of Co–Cr–Mo alloys fabricated by SLM has not been studied. Therefore, in this study, the effect of pores on the tensile properties of a Co–Cr–Mo alloy fabricated by SLM was studied.
Keywords
Acknowledgements
This research was supported by the Korea Institute of Industrial Technology (KITECH JA-21–0010) and the Creative Materials Discovery Program (No. NRF-2019M3D1A1079227) through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT.
Citation
Im, H.-T., Kang, H.-S., Kang, H.-G., Kim, H.K., Choi, J., Park, K.B., Lee, T.W., Mo, C.B. and Park, H.-K. (2022), "Effect of internal pores on tensile properties of Co-Cr-Mo alloy fabricated by selective laser melting", Rapid Prototyping Journal, Vol. 28 No. 2, pp. 404-408. https://doi.org/10.1108/RPJ-02-2021-0030
Publisher
:Emerald Publishing Limited
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