热连轧GH4169合金的晶粒长大行为  

Study on Grain Growth of Hot Continuous Rolled GH4169 Superalloy

作　　者：孔永华[1] 胡华斌[1] 李东方[1] 陈国胜[2] 朱世根[1] 

机构地区：[1]东华大学,上海201620 [2]宝钢集团特殊钢分公司,上海200940

出　　处：《稀有金属材料与工程》2012年第5期877-880,共4页Rare Metal Materials and Engineering

基　　金：上海市重大基础研究项目子课题(08dj1400405)

摘　　要：对热连轧(HCR)GH4169合金在固溶处理过程中晶粒长大行为进行系统研究。结果表明,该合金?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℃时的晶粒长大激活能为223.849kJ/mol,晶粒长大机制为自扩散过程控制机制,并建立了相应的晶粒长大动力学方程。Grain growth behavior and its kinetics during the solution treating process of hot continuous rolled（HCR） GH4169 superalloy have been investigated.The experimental results show that the δ-phase dissolution temperature of HCR GH4169 superalloy is from 990 °C to 1000 °C,and the δ-phase in the superalloy greatly restrains grain growth,The solution treatment at the temperature below δ-phase dissolution leads to little variation of grain size,and the solution treatment at the temperature above the δ-phase dissolution leads to the rapid grain growth for HCR GH4169 superalloy.The grain growth kinetics at the temperature above the δ-phase dissolution shows that grain growth exponentially increases with the increasing of solution treating temperature.At the temperatures from 1000 °C to 1050 °C,the activation energy value for grain growth in HCR GH4169 superalloy is 223.849 kJ/mol,which means that the grain growth mechanism is self-diffusion-controlling process,and the grain growth kinetics eqution are given.

关 键 词：热连轧GH4169合金 晶粒长大指数 晶粒长大激活能 

分 类 号：TG131[一般工业技术—材料科学与工程]