After standard heat treatment of 960 ℃ ×1 h+720 ℃ × 8 h+620 ℃ × 8 h,GH4169 alloy was subjected to long-term aging at 650 °℃ for 100-4000 h.The microstructure evolution law mechanical properties and their relationship of the alloy during long-term aging was explored.The results show that after aging at 650 ℃ for 100-800 h,a large number of γ"and y'phases precipitate in the grain,8 phase precipitates at the grain boundary,and the hardness of the alloy increases.After aging for 1600-2400 h,γ"and γ'phases grow up gradually,8 phase coarsens gradually and γ"poor zone appears around the δ phase,and the alloy hardness increases slowly.After aging for 3200-4000 h,γ"and γ'phases coarsen obviously and a large number of γ"phases change into 8 phase,and the hardness of the alloy decreases.Meanwhile,the tensile strength and yield strength of the alloy after long-term aging are consistent with the change of hardness,and the plasticity shows a decreasing trend.
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