Effect of phase transformation on the mechanical properties of the Co-Cr-Mo alloy fabricated by selective laser melting
- Authors
- Im, Hyeon-Tae; Kim, Dae Ha; Kim, Young Do; Fadonougbo, Julien O.; Mo, Chan Bin; Park, Jae-Young; Park, Ki Beom; Kang, Jang-Won; Kang, Hyun-Su; Park, Hyung-Ki
- Issue Date
- Apr-2022
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Co-Cr-Mo alloy; Selective laser melting; Stress relief annealing; Residual stress; Phase transformation
- Citation
- MATERIALS CHARACTERIZATION, v.186, pp.1 - 7
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHARACTERIZATION
- Volume
- 186
- Start Page
- 1
- End Page
- 7
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/139026
- DOI
- 10.1016/j.matchar.2022.111767
- ISSN
- 1044-5803
- Abstract
- In this study, we examined the effect of stress relief annealing (SRA) temperatures on the microstructure and mechanical behavior of a Co-Cr-Mo alloy fabricated by selective laser melting (SLM). For the SRA, the as-built SLM samples were annealed at 750 °C and 1050 °C. In the as built SLM sample, the γ phase was mainly formed, but some ε phases were present together. The percentage of the ε phase increased significantly after SRA at 750 °C, and a microstructure with a 100% γ phase formed after SRA at 1050 °C. Changes in mechanical properties were characterized by an increase in both hardness and yield strength, while the elongation decreased after SRA at 750 °C. This was caused by the formation of the ε phase, which possesses high strength and hardness but brittleness. After SRA at 1050 °C, the hardness and yield strength decreased, and the elongation increased compared to the as-built SLM sample because of the decrease in the residual stress. In the γ phase of the Co-Cr-Mo alloy, strain-induced γ to ε martensitic transformation occurring during deformation, and it was more marked in the as-built SLM sample with high residual stress. Therefore, when the as-built sample was deformed, the brittle ε phase formed more rapidly than in the sample after SRA at 1050 °C, resulting in low elongation.
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