The effect of solution and aging treatments on the microstructure and mechanical properties of a selective laser melted CoCrMo alloy
Source abstract
Abstract
Selective laser melted (SLMed) CoCrMo alloy specimens were subjected to solid solution and aging treatments, and then, their microstructure evolution and mechanical properties were systematically investigated. It is found that the SLMed CoCrMo sample mainly consists of a metastable γ phase with a parallel orientation between [011]γ and [2 $$overline{1}overline{1}$$ 0]ε. Phase transformation has occurred on cellular grains and columnar grains after solid solution treatment, and meanwhile ε-martensite twins and γ(220) appear. During aging treatment, the σ phase precipitate in the CoCr-matrix acting as the second phase, which hinders the motion of dislocations and results in comprehensive phase transformation properties. The specimen aged at 1173 K for 4 h exhibits an ultimate tensile strength of 1020 MPa, a yield strength of 677 MPa and an elongation of about 23.0% which is about twice than that of the SLMed specimen. These results should provide a good reference for improving the mechanical performance of SLMed Co-based alloys.
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Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · High Entropy Alloys Studies · Surface Treatment and Residual Stress
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References (43)
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