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990~1000℃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行固溶处理时，晶粒生长指数随着固溶温度的升高而增加；固溶处理温度为1000和1050℃下的晶粒长大激活能为223.849kJ/mol，晶粒长大机理为自扩散过程控制机理，并建立了相应的晶粒长大动力学方程。
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.
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