Research on Microstructure and Mechanical Properties of Casting Nickel Base Superalloy
The tensile properties and fracture behavior of a cast nickel-based superalloy in the temperature range of 25-980℃were studied.The microstructure and fracture morphology of the alloy were studied by SEM.The results show that the alloy exhibits obvious abnormal yield and medium temperature brittle behavior.As the tensile temperature increases,the alloy′s tensile and yield strength first slowly decrease,then increase to a peak,and then rapidly decrease.Among them,the tensile strength of the alloy reaches its peak at 700℃,and the yield strength reaches its peak at 800℃.The elongation of the alloy first slowly decreases and then rapidly increases and then tends to be flat.Among them,the elongation is the lowest at 700℃.The tensile behavior of the alloy is related to the microstructure of the alloy,such as MC carbide,γ′ phase and γ/γ′ eutectic.
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