【摘要】 研究了热处理温度和保温时间对GH4169合金晶粒长大规律和硬度的影响。结果表明,δ相对晶粒长大有显著阻碍作用,在低于δ相完全溶解温度热处理时,未溶解的δ相使晶粒长大缓慢;在高于δ相完全溶解温度热处理时,合金为单相奥氏体组织,晶粒随温度的升高迅速长大。晶粒长大动力学表明:在热处理温度高于1050℃时的晶粒长大激活能为157.6kJ/mol,晶粒长大机理为Ni基合金的晶界扩散过程所控制.同时也建立了相应的晶粒长大动力学方程。更多还原

【Abstract】 The effects of solid-solution temperature and holding time on the grain growth and hardness of GH4169 superalloy were investigated.The results show that the grain growth of GH4169 superalloy would be hindered for the existence of delta phase.The grain size increases slowly when heat treated at temperatures below the complete solution temperature of delta phase,whereas,the grain size increases quickly.The grain growth dynamics of GH4169 superalioy shows that the activation energy of grain growth is 157.6kJ/mol when heat treated at temperatures beyond 1050℃.The grain growth of GH4169 superalloy is controlled by the grain boundary diffusion of nickel-based alloy.The equation of the grain growth dynamics for GH4169 superalloy is also established.更多还原