Effect of Heat Treatment on Microstructure and Mechanical Properties of GH4169 Superalloy

The effects of the solution and aging treatment on the microstructure, the tensile properties at room-temperature and 650 oC and the stress rupture of GH4169 superalloy were investigated. The results show that after solution at 980 oC and aging at 720 oC plus 620 oC, both the yield strength and ultimate strength of the superalloy at room-temperature and 650 oC are highest; after solution at 960 oC and aging at 720 oC plus 620 oC, the stress rupture life of the superalloy tested at 650 oC and 725 MPa is the longest; the solution treatment can adjust the amount of d phase, primary strengthening g" phase precipitates upon aging at 720 oC, while assistant strengthening g ' phase precipitates at 620 oC.