Effect of Solid Solution Cooling Rate on Microstructure and Properties of Nickel-Based Powder Superalloys AITranslate

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Chinese Library Classification Number:TG132.32[一般工业技术—材料科学与工程]

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Taking nickel-based powder superalloys for turbine disks as the research object,gradient change of γ′microstructure morphology and size was achieved on a single sample by gradient cooling.The effect of solid solution cooling rate on the microstructure and mechanical properties of the alloy was investigated by scanning electron microscope observation and Vickers hardness test.The effect of solid solution cooling rate on the element segregation behavior in γ phase and γ′phase was investigated by three-dimensional atomic probe analysis.The results show that with the decrease of solid solution cooling rate,the size of γ′phase gradually increases and then tends to be stable.The size ofγ′phase is smaller and the shape is nearly spherical at a faster solid solution cooling rate.At a slower solid solution cooling rate,the γ′phase is distributed in the form of secondary γ′phase and tertiary γ′phase,and the size of the secondary γ′phase is larger.Different solid solution cooling rates have no obvious effect on the element distribution in γ phase and γ′phase.Ni,Al,Ti and Nb are mainly distributed in the γ′phase,while Co,Cr and Mo are mainly distributed in the γ matrix phase,and no obvious segregation of W element is observed.Due to the use of the gradient cooling experimental method,the range of cooling rate is too large,and multiple inflection points of hardness change are captured in the experimental results.The alloy hardness shows a nonlinear change trend with the decrease of solid solution cooling rate.