Characterization of residual stresses and microstructural features in an Inconel 718 forged compressor disc  

Inconel 718合金锻造压气机盘件的残余应力及显微组织特征（英文）

作　　者：Xiao-yan XU Xiang-dong MA Hong WANG Zhang YE Jian-wei CHANG Yao XU Guang-ai SUN Wei-jie Lü Yu-kui GAO 徐小严;马向东;王虹;叶璋;常建卫;徐瑶;孙光爱;吕维洁;高玉魁(中国航空发动机集团中国航发商用航空发动机有限责任公司,上海201108;深圳市万泽中南研究院有限公司,深圳518045;中国工程物理研究院核物理与化学研究所,绵阳621999;同济大学航空航天与力学学院,上海200092;上海交通大学金属基复合材料国家重点实验室,上海200240)

机构地区：[1]Commercial Aircraft Engine Co., Aero Engine Corporation of China, Shanghai 201108, China [2]Shenzhen Wedge Central South Research Institute Co., Ltd., Shenzhen 518045, China [3]Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics, Mianyang 621999, China [4]School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China [5]State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第3期569-578,共10页中国有色金属学报（英文版）

基　　金：Project supported by Commercial Aircraft Engine Co.,Aero Engine Corporation of China;Project(2014CB046701) supported by the National Basic Research Program of China

摘　　要：Residual stress plays an important part in fabricating commercial aero engine Inconel 718 components for their fatigue properties, reliability and durability. Due to the limitation of Chinese neutron diffraction instrument and lack of test practice and specifications, there is little systematic research on the residual stress of forged compressor disc. X-ray diffraction and neutron diffraction methods were used to measure the residual stress of Inconel 718 forged discs at the surface and in the interior, respectively. Scanning electron microscope and transmission electron microscope were used to characterize the microstructural features. The residual stress state at the disc is in near-surface compression, balanced by tension within the disc core. However, the surface residual stress of disc depends more on the rough machining than on the forging process. Also, the dislocation densities increase with decreasing distance to the surfaces of disc, and the residual stress accelerates dislocation generation and dynamic recrystallization.残余应力对商用发动机Inconel 718材料构件的疲劳性能、可靠性与耐久性起着重要作用,但由于中国中子衍射测量设备与测量经验与标准的缺乏,压气机盘件的系统性残余应力研究鲜见报导。采用X射线与中子衍射分别测量Inconel 718锻造盘件的表面及内部残余应力,采用扫描电子显微镜与透射电子显微镜观察锻造显微组织特征。锻造盘件表面呈压残余应力,内部为拉残余应力,且相比于锻造产生的残余应力,盘件表面的残余应力受粗加工影响较大。位错密度随距盘件表面的距离减小而增高,残余应力会加速位错产生与动态再结晶。

关 键 词：neutron diffraction X-ray diffraction residual stress Inconel 718 compressor disc 

分 类 号：TG132.3[一般工业技术—材料科学与工程]