Abstract: Effect of secondary solid solution treatment on microstructure and high temperature tensile property of the IN718 alloy was investigated. The results show that compared with primary solid solution treatment, the content of δ phase in the IN718 alloy increases and the high temperature yield strength decreases after the secondary solid solution treatment. With the increase of secondary solid solution treatment temperature, the δ phase precipitation decreases, the high temperature yield strength increases.

Key words: IN718 alloy, secondary solid solution treatment, microstructure, properties