Study on Heat-Treatment Cooling Rate of FGH96 Alloy with Different Grain Sizes
On the premise of performance satisfaction,to acquire the boundary of the heat treatment parameters is significant for property optimization of FGH96 turbine disks,especially the boundary of the minimum cooling of FGH96 alloy with certain grain size on the premise of performance satisfaction.The tensile behavior at 25,650 and 750 ℃ of FGH96 specimens with different grain sizes was investigated during the cooling process from solution temperature at different cooling rates,and the microstructures were observed.The results show that the results obtained by the multi-mechanistic strengthening model including the effect of chemical composition,grain size,size and volume fraction of γ'agree well with the experimental measurements.Through the strengthening model,the relationship between minimum cooling rate and grain size was studied:the grain size should be smaller than 14 pm if the cooling rate is 55 ℃/min,the grain size should be smaller than 16.8 μm if the cooling rates is 72 ℃/min,and the grain size should be smaller than 20 μm if the cooling rates is 81 ℃/min.The relationship between minimum cooling rate and grain size can be used as a criterion for the guidance of parameter design of heat treatment process through simulation.
FGH96minimum cooling rategrain sizemulti-mechanistic strengthening model
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