Changes in the morphology and size of the γ'phase of C-HRA-3 heat-resistant alloy after aging at 700 and 750℃with respect to aging temperature and time were investigated.The coarsening kinetics of γ'phase is derived,and an attempt is made to predict the γ'phase size at 105h.The results show that the shape of γ'phase is uniform spherical distribution after long term aging at 700℃/11023h in the C-HRA-3 alloy.The size of the γ'phase increases and the shape changes from spherical to partially spherical after long term aging at 750℃/11023h.The size of the γ'phase gradually increases with the increase in aging temperature and time,and the effect of aging temperature is more significant.The growth kinetics equation of the γ'phase in C-HRA-3 alloy after aging at 700 and 750℃was obtained,and the effective activation energy of γ'phase growth,DEff,was calculated to be 260kJ/mol.It was predicted that the average diameter of the γ'phase would be about 140nm and about 230 nm when aged at 700 and 750℃for 105h,respectively.
C-HRA-3 heat-resistant alloyhigh temperature agingγ'phasegrowth kinetics
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