Abstract
Hot-die forging+direct aging processing was used to improve the microstructure and mechanical property of P/M superalloy FGH 4096, a kind of materials used in turbine disk, which includes a solution treatment at 1130 for 0.5 h, multiaxially forging (total deformation about 100%) and direct aging at 760 for 16 h, in addition, drawing (70%) and upseting (40%)+direct aging treatment has also been invesigated. OM, SEM and TEM were employed to study the microstructure evolution and strengthen mechanism. It was found that the direct aging treatment has obvious effect on strengthening, especially, for the multiaxially forged alloy, in which dynamic recrystallization appeared, and the previous particle boundary is replaced by clean recrystallized boundary and the grain is refined to about 6 μm. After direct aging the average size of γ � phase is 80 nm, and the tangled dislocation is still reserved. The strengthening mechanisms include grain refinement, clean boundary, thermomechanical deformation and γ � phase precipitation.
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