Hot oscillatory pressure preparing low-cost FGH4096 superalloys with high performance

Abstract

The low-cost and high-performance FGH4096 superalloy was prepared by replacing the high-cost fine powder particles (<51 μm) with coarse particles (>120 μm) using the hot oscillatory pressure (HOP) sintering method. The effects of powder particle size on the grain size and mechanical properties of the superalloy were investigated. The results showed that the tensile strength is 1350 MPa and the elongation is 30.4% for the HOP samples of coarse powder, the mechanical properties are higher than that of the samples prepared by the hot-press (HP) with finer powder. In addition, HOP sintering shows good inhibitory effect for the prior particle boundaries (PPB) in the powder metallurgy superalloys, for the HOP sintering providing the great driving force of particles plastic deformation. The results suggest that the coarse powder particle size with HOP sintering can achieve the better mechanical properties for the FGH4096 superalloys, thus provides a strategy for the low-cost and high-performance powder metallurgy superalloys.