Abstract
In this work, the matrix of CoCrMoW alloy fabricated by selective laser melting is mainly γ-Co phase. After the aging treatment at 750 °C, lamellar ε-Co phase formed according to a Shoji-Nishiyama orientation relationship with γ-Co phase and nanometer-scaled Co3(Mo,W)2Si precipitation uniformly distributed on the matrix, the strength and corrosion resistance increased, but the ductility decreased. After the solution treatment at 1200 °C, recrystallization happened, the fine columnar sub-grains of γ-Co phase in the as SLMed alloy were replaced by larger grains mainly with large-angle grain boundaries, the ductility increased, but the tensile strength and corrosion resistance decreased. Results of this work can provide a perspective towards microstructure regulation of SLMed CoCrMoW alloy.
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