固溶处理对GH4169合金晶粒长大和硬度的影响

研究了GH4169合金在不同固溶温度和保温时间下进行固溶处理时晶粒长大的规律和其对硬度的影响。结果表明:该合金的δ相溶解温度在980～1000 ℃之间,不同固溶处理条件下GH4169合金的晶粒长大具有不同特点,在低于δ相溶解温度热处理时晶粒长大缓慢,当热处理温度高于δ相溶解温度时,晶粒尺寸随热处理温度的升高而快速长大;建立了GH4169合金在1000 ℃以上热处理过程中的晶粒长大动力学模型,晶粒长大的激活能为285.013 kJ/mol;GH4169合金的硬度随固溶温度的升高和保温时间的延长而降低,且合金的晶粒尺寸和硬度值遵循Hall-Petch关系。

Effect of solution treatment on grain growth and hardness of GH4169 alloy

Effect of solid solution treatment on grain growth and hardness of GH4169 alloy was studied under different heating temperatures and holding time.The results show that the δ phase dissolution temperature of the alloy is between 980℃ and 1000℃.The grain growth of the alloy has different characteristics under different solid solution treatment processes.When the solution treatment temperature is lower than the δ dissolution temperature,the grain growth is slow;when the heat treatment temperature is higher than that,the grain size grows rapidly with the increase of temperature.The kinetic model of grain growth of the alloy during heat treatment above 1000℃ is established,with the activation energy of grain growth being 285.013 kJ/mol.The hardness of the alloy decreases with the increase of solution temperature and holding time,and the grain size and hardness of the alloy follow Hall-Petch relation.