Zr-4合金在LiOH溶液中的微动损伤机理  

Fretting damage mechanism of Zr-4 alloy in LiOH solution

作　　者：张晓宇[1] 史义超 袁新璐 蒲超 姜成 柯希京 张渝 ZHANG Xiaoyu;SHI Yichao;YUAN Xinu;PU Chao;JIANG Cheng;KE Xijing;ZHANG Yu(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Mechanical Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]西南交通大学机械工程学院,四川成都610031 [2]成都大学机械工程学院,四川成都610106

出　　处：《实验技术与管理》2025年第1期105-113,共9页Experimental Technology and Management

基　　金：国家自然科学基金项目(51775459,52305182);四川省重点研发项目(23ZDYF0375)。

摘　　要：在研制的多功能微动磨损试验机上开展了锆合金在LiOH腐蚀溶液(0.01 mol/L)中的微动磨损实验,实验材料选用核燃料包壳管常用材料Zr-4合金。实验结束后采用光学显微镜(OM)、白光干涉仪、扫描电子显微镜(SEM)和能谱仪(EDX)等设备对磨痕形貌、磨屑成分等进行分析表征,揭示锆合金在LiOH腐蚀溶液(0.01mol/L)中的微动损伤机理。结论如下:随着位移幅值的增大,锆合金在LiOH溶液中的微动运行逐渐由部分滑移区向混合区和滑移区转变;稳态摩擦系数随着位移幅值的增大而增大;微动运行在部分滑移区时,微动损伤以轻微粘着磨损和塑性变形为主,混合区微动损伤以粘着磨损、腐蚀磨损和塑性变形为主,滑移区微动损伤以磨粒磨损、腐蚀磨损和剥层磨损为主。[Objective]Zirconium alloy cladding,as an important barrier in nuclear reactors,needs to be able to not only completely prevent the leakage of nuclear fission products but also resist micromotion wear caused by cooling water flow.Taking Zr-4 alloy,a commonly used fuel cladding material in nuclear power,as the research object,and LiOH solution,the main component of nuclear power primary coolant,as the experimental environment,the micromotion damage problem of nuclear power fuel zirconium alloy in LiOH solution is studied.The micromotion wear test of zirconium alloy in LiOH corrosion solution(0.01 mol/L)is carried out on the developed multifunctional micromotion wear testing machine.The research results provide data and theoretical support for improving the micromotion damage problem of nuclear fuel cladding tubes,which is crucial for the safe and stable operation and the service life extension of nuclear reactors.[Methods]AF_(t)er the experiment,the morphology and damage mechanism of the wear marks were analyzed using an optical microscope(MV 3000)and a scanning electron microscope(SEM,Quanta 2000)and the three-dimensional morphology and wear volume of the wear marks were measured using a contour GT.The SEM was used to observe the wear scar area of the sample,and the corresponding electronic energy spectrometer was used to qualitatively and quantitatively analyze the local chemical composition of the wear scar area,thereby revealing the micromotion damage mechanism of zirconium alloy in LiOH corrosion solution(0.01 mol/L).[Results&Conclusions]The results show that when the micromotion runs in a partial slip zone,the Ft-D-N curve in a stable state presents a straight line shape,the friction coefficient curve is relatively flat,the three-dimensional morphology has small fluctuations,the wear amount is minimal,no obvious damage is observed at the center of the wear scar,and slight plastic deformation is observed at the edge of the wear scar.The micromotion damage mechanism is adhesive wear.When the micromotion runs i

关 键 词：微动磨损 锆合金 摩擦系数 损伤机制 

分 类 号：TH117.1[机械工程—机械设计及理论]