应力时效对发动机用GH4169镍基合金组织演化及蠕变抗力的影响  

Effects of Stress Aging on Microstructure Evolution and Creep Resistance of GH4169 Ni-base Alloy for Engine

作　　者：刘剑辉[1] 杨树峰[2] 赵跃文 LIU Jianhui;YANG Shufeng;ZHAO Yuewen(State Key Laboratory of Advanced Steel Processes and Products,CISRI,Beijing 100081,China;School of Metallurgical and Ecological Engineering,University of Science ＆ Technology Beijing,Beijing 100083,China;Changchun Faw Sihuan Engine Manufacturing Co.,Ltd.,Changchun 130013,China)

机构地区：[1]钢铁研究总院先进钢铁流程与材料国家重点实验室,北京100081 [2]北京科技大学冶金与生态工程学院,北京100083 [3]长春一汽四环发动机制造有限公司,沈阳长春130013

出　　处：《热加工工艺》2018年第16期196-199,共4页Hot Working Technology

基　　金：电磁制动在中间包冶金中应用的基础研究项目(51474076)

摘　　要：研究GH4169定向凝固镍基合金在近服役状态下表现出的蠕变性能,并对其进行SEM与TEM微观形貌表征。结果表明：合金蠕变过程包含了初期蠕变、稳态蠕变与加速蠕变3个阶段。合金可以达到9600 h的较长蠕变寿命,表明此合金具备优异的蠕变抗力。经过3000 h蠕变后,γ＇相尺寸变得更加粗大,γ基体通道内发生了大量位错滑移的现象,同时,也有部分位错通过剪切方式进入到γ＇相中。对合金进行固溶热处理后,晶界区域生成了许多细小碳化物,且在枝晶间产生了约0.4μm的近立方γ＇相。当应力时效时间逐渐延长后,γ＇相厚度开始增大;当试样最后蠕变断裂时,断口区的γ＇相厚度约为1.8μm。The creep properties of the directional solidified nickel-base alloy GH4169 were studied in near service state,and the microstructure was studied by SEM and TEM. The results show that, the creep process of the alloy consists of three stages： initial creep, steady creep and accelerated creep. The alloy has a long creep life of 9600 h, which indicates that the alloy has excellent creep resistance. After creep for 3000 h, the size of γ＇ phase becomes thicker, and a large number of dislocation slip occurs in γ matrix channel. At the same time, some dislocations enter γ＇ phase in shear mode. After the solution heat treatment of the alloy, it is found that many fine carbides are formed in the grain boundary area, about 0.4 μm near cubic γ＇ phase is produced between dendrites. The thickness of γ＇ phase increases with the stress aging time increases.The thickness of γ＇ phase in the fracture zone is about 1.8 μm when the specimen is finally creep fracture.

关 键 词：GH4169镍基合金 应力时效 蠕变 变形特征 

分 类 号：TG111.8[金属学及工艺—物理冶金] TG146.15[金属学及工艺—金属学]