晶粒度对Inconel 690合金微动磨损行为的影响  

Effect of grain size on fretting wear behavior of Inconel 690 alloy

作　　者：李萧 辛龙 Li Xiao;Xin Long(National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083

出　　处：《金属热处理》2023年第1期12-17,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2019YFB1900904)。

摘　　要：为预防及减缓微动损伤对核反应堆蒸汽发生器传热管的危害,深入研究了晶粒尺寸对Inconel 690合金微动磨损行为的影响。采用微动磨损试验方法对Inconel 690合金的微动磨损特性展开研究,并利用光学显微镜(OM)、维氏硬度计、扫描电镜(SEM)、能谱仪(EDS)和激光共焦扫描显微镜(LSCM)等对不同固溶温度下材料的微观组织结构、硬度和磨痕特征进行观察和分析。结果表明,随着固溶温度的升高,Inconel 690合金晶粒尺寸增大,硬度降低;在完全滑移区,摩擦因数随晶粒度和硬度的变化很小,其值均约为0.48;当Inconel 690合金平均晶粒尺寸为112μm,且SS304与Inconel 690合金硬度比为260∶176.4时,Inconel 690合金磨损体积最少;不同晶粒度和硬度下Inconel 690合金的微动磨损机制主要为剥层磨损、磨粒磨损和粘着磨损。In order to prevent and mitigate the harm of fretting damage to nuclear reactor steam generator tube,the effect of grain size on fretting wear behavior of Inconel 690 alloy was investigated systemically.Fretting wear test was conducted to study fretting wear characteristics of the Inconel 690 alloy,and microstructure,hardness and worn scars characterization of the alloy at different solution temperature were observed by means of OM,Vickers hardness tester,SEM,EDS and LSCM.The results indicate that the grain size increases with the increase of solution temperature,whereas the hardness decreases.In the gross slip regime,the friction factor hardly changes with the variation of grain size and hardness,which is 0.48.The grain size of the Inconel 690 alloy with the value of 112μm,while the ratio of hardness of SS304 alloy to the Inconel 690 alloy with the value of 260∶176.4 are proved to favor for the alloy to acquire the lowest level of wear volume.With different grain size and hardness,the main mechanism of fretting wear for the Inconel 690 alloy are delamination wear,abrasive wear and adhesive wear.

关 键 词：Inconel 690合金 晶粒尺寸 硬度 摩擦因数 微动磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]