热连轧GH4169合金晶粒的长大规律

对热连轧GH4169合金在固溶处理过程中晶粒长大规律进行了系统的研究。研究结果表明,该合金δ相溶解温度在990~1 000℃之间,δ相对晶粒长大有显著阻碍作用,在低于δ相溶解温度进行固溶处理时,析出的δ相使得晶粒长大缓慢;在高于δ相溶解温度以上时,晶粒随温度的升高快速长大。晶粒长大动力学表明：在高于δ相固溶线温度以上进...

Grain Growth of Hot Continuous Rolling GH4169 Superalloy

Grain growth behavior and its kinetics during solution treating process of hot continuous rolling (HCR) GH4169 superalloy was investigated. The experimental results show that δ-phase dissolution temperature of HCR GH4169 superalloy is from 990 to 1000℃, and δ-phase in the superalloy greatly restrain grain growth. The solution treatment at temperature below δ-phase dissolution leads to little variation of grain size and solution treatment at temperature above δ-phase dissolution leads to rapid grain growth for HCR GH4169 superalloy. The grain growth kinetics at temperature above δ-phase dissolution shows that grain growth exponentially increases with the increasing solution treating temperature. At the temperatures from 1000 to 1050℃, the activation energy value for grain growth in HCR GH4169 superalloy is 223.849kJ/mol , which means that the grain growth mechanism is self-diffusion-controlling process, and the grain growth kinetics eqution are given.