High temperature oxidation behavior of laser powder bed fusion printed WC/Inconel 718 composites
2022
Wang, Rui | Gu, Dongdong | Zhang, Hongmei | Guo, Meng
Generally, improving the high temperature oxidation resistance of nickel-based materials is crucial to enhance their service performance in high-temperature service environment. In this study, the microscale WC particles reinforced Inconel 718 composites were processed by laser powder bed fusion (LPBF). The three heat treatment processes including double aging (DA), solution + double aging (SA) and homogenization + double aging (HA) were conducted on the LPBF-processed WC/Inconel 718 composite, respectively. The effects of heat treatment on microstructures and high temperature oxidation behaviors of LPBF-printed WC/Inconel 718 composite were investigated. It was found that the precipitates in LPBF-printed WC/Inconel 718 increased significantly after heat treatments and the contents of γ′ and γ″ precipitates under as-built (AB), DA, SA and HA conditions were 23.9%, 31.9%, 38.2%, 38.3%, respectively. Moreover, more δ phase was precipitated in the DA, while more (Nb, Ti)C was observed in the SA and HA samples. The high temperature oxidation experiments demonstrated that the oxidation kinetics of all samples conformed to the parabolic law and the oxidation resistance showed the tendency of HA > SA > DA > AB. The excellent oxidation resistance of HA-processed WC/Inconel 718 composite was owing to the uniformly distributed dense Cr₂O₃ and continuous Ni₃Nb on the oxide layer.
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