STRENGTHENING MECHANISM OF POWDER METALLURGY SUPERALLOY BY HOT-DIE FORGING + DIRECT AGING
Received date: 2009-11-24
Revised date: 2009-12-30
Online published: 2010-03-11
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.
ZHU Yong-Quan . STRENGTHENING MECHANISM OF POWDER METALLURGY SUPERALLOY BY HOT-DIE FORGING + DIRECT AGING[J]. Acta Metall Sin, 2010 , 46(3) : 324 -328 . DOI: 10.3724/SP.J.1037.2009.00781
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