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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1 000和1 050℃下的晶粒长大激活能为223.849 kJ/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。
The regularity of grain growth in hot rolling GH4169 alloy during solution treatment was systematically studied. The results show that the δ phase dissolution temperature of the alloy is between 990 and 1 000 ℃, and δ has a significant hindrance to the grain growth. When the solution temperature is lower than the δ-phase dissolution temperature, the precipitated δ phase makes the crystal grains Grows slowly; above the δ-phase dissolution temperature, the grain grows rapidly with increasing temperature. The grain growth kinetics shows that the grain growth index increases with the increase of solution temperature at solution temperature above the δ-phase solvus temperature; the solution treatment temperature is 1000 and 1050 ℃ The activation energy of grain growth is 223.849 kJ / mol. The mechanism of grain growth is controlled by self-diffusion process, and the corresponding kinetic equation of grain growth is established.