GH4169高温合金的疲劳行为研究  

Study on fatigue behavior of GH4169 superalloy

作　　者：刘敏 胡倩楠 杨凡 汤佳杰 李方杰 王晓玮 LIU Min;HU Qiannan;YANG Fan;TANG Jiajie;LI Fangjie;WANG Xiaowei(School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 201418,China;School of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201602,China;School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201602,China)

机构地区：[1]上海应用技术大学材料科学与工程学院,上海201418 [2]上海工程技术大学材料科学与工程学院,上海201602 [3]上海工程技术大学机械与汽车工程学院,上海201602

出　　处：《有色金属材料与工程》2024年第5期18-25,共8页Nonferrous Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(52401160);中国博士后科学基金资助项目(2024M751163)。

摘　　要：对GH4169高温合金在低周疲劳和高低周复合疲劳条件下的微观组织演变、疲劳寿命以及断口形貌进行了系统研究。通过MTS809疲劳试验机对材料进行疲劳实验,并利用扫描电子显微镜(scanning electron microscope,SEM)和电子背向散射衍射(electron back-scattered diffraction,EBSD)对疲劳断口及微观组织进行分析。结果表明:在低周和高低周复合疲劳条件下,裂纹主要萌生于材料的表面,并沿着滑移带和晶界扩展;两种疲劳条件下的疲劳断口均表现出韧窝结构,其中高低周复合疲劳条件下的韧窝更为显著;碳化物夹杂是韧窝形核的重要位置;疲劳加载过程中形成的大量小角度晶界可能是导致韧窝形成的主要原因。A systematic study was conducted on the microstructural evolution,fatigue life,and fracture morphology of GH4169 superalloy under low-cycle fatigue and combined high and low cycle fatigue conditions.The material was subjected to fatigue testing using an MTS809 fatigue testing machine,and the fatigue fracture surfaces and microstructures were analyzed in detail using a scanning electron microscope(SEM)and electron backscatter diffraction(EBSD).The results indicate that under low cycle fatigue and high and low cycle fatigue conditions,cracks mainly originate on the surface of the material and propagate along slip bands and grain boundaries.The fatigue fracture surfaces under the two fatigue conditions exhibit dimple structures,with dimples being more pronounced under high and low cycle fatigue conditions.Carbide inclusions are important locations for dimple nucleation.The large number of small angle grain boundaries formed during fatigue loading may be the main reason for the formation of ductile dimples.

关 键 词：高温合金 微观组织 疲劳寿命 断口形貌 

分 类 号：TG132.3[一般工业技术—材料科学与工程]