The hot compressive deformation experiments were conducted on the delta-processed GH4169 alloy at the deformation temperatures of 900- 1 060 ℃ and strain rates of 0. 001 - 0. 500 s-1. The effects of deformation temperature, strain rate and strain on the microstructure and the morphology and evolution of 3 phase were studied and the evolution mechanism of microstructure was analyzed. The results show that a large number of plate-like or long-needle-like 3 phase distributed in the microstructure of the delta-processed alloy. During the hot compr...