Study on γ Matrix Phase Channels in Nickel-based Single Crystal Superalloy
Nickel-based single crystal superalloys have excellent mechanical properties at high temperature and are key materials in the aerospace and nuclear fields.The γ channel evolution of the third-generation nickel-based single crystal superalloy DD10 was investigated by examining the changes in the as-cast,force loaded,and heat-treated states.The single crystal properties of the as-cast sample were also tested using four-circle neutron diffraction.The results show that DD10 has good single crystal properties on the[200],[020]and[002]crystal faces.The ordering of the γ matrix channels and the channel width increase after force loading and heat treatment,and secondary precipitates strengthen the γ matrix channels under loading.After heat treatment at 900℃,the Co and Cr element contents in the γ matrix channels significantly increase,and the Co element content is consistent in the same vertical channels.The Cr element content is consistent in the same horizontal channels.Trace elements such as Mo,Re,and W enter more into the precipitation-strengthened phase from the γ matrix channels after heat treatment.
nickel-based single crystal superalloyneutron diffractionγ-matrix channelsheat treatment
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