Influence of γ′ precipitate morphology on the creep property of a directionally solidified nickel-base superalloy

The effect of γ′ precipitates of different morphologies and sizes on the creep property of DZ951 alloy was investigated. Standard heat treatment (SHT) alloy has regularly aligned cubic γ′ phase and the γ′ size is about 300 nm. γ′ phase of HT1 alloy has the shape of cuboid and the size of 880 nm. HT2 alloy has γ′ precipitates of different morphologies and sizes. There is spherical γ′ phase of 150 nm in size between γ′ raftings. SHT and HT1 alloys...