摘要
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 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 similar to 700 degrees C, but slightly decreases at 800 degrees C. When the exposure temperature reaches above 900 degrees C, a rapid decrease in hardness of alloy 718 occurs before the holding time of 0.3 h. Above the delta solvus temperature, gamma and gamma phases are dissolved directly into the matrix without delta precipitation, resulting in a rapid grain growth.
出处
《中国有色金属学会会刊：英文版》
CSCD
2000年第3期340-344,共5页
Transactions of Nonferrous Metals Society of China
