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The precipitation and grain growth behavior during isothermal treatment of hot extruded alloy 718 was investigated. It is found that the hardness of the hot extruded alloy 718 increases with holding time at 600～700 ℃, but slightly decreases at 800 ℃. When the exposure temperature reaches above 900 ℃, a rapid decrease in hardness of alloy 718 occurs before the holding time of 0.3 h. Above the δ solvus temperature, γ ′ and γ ″ phases are dissolved directly into the matrix without δ precipitation, resulting in a rapid grain growth.
The precipitation and grain growth behavior is isothermal treatment of extruded rubber 718 was investigated. It is found that the hardness of the extruded rubber 718 increases with holding time at 600-700 ° C, but slightly decreases at 800 ° C. When the exposure temperature reaches above 900 ° C, a rapid decrease in hardness of alloy 718 occurs before holding time of 0.3 h. Above the δ solvus temperature, γ ’and γ "phases are dissolved directly into the matrix without δ precipitation, resulting in a rapid grain growth .