等离子熔覆FeCoNiCrMnAl_(0.5)Si_(0.5)高熵合金修复密封环  

Plasma Cladding FeCoNiCrMnAl0.5Si0.5 High Entropy Alloy for Repairing Sealing Rings

作　　者：黄绍服[1] 王晓龙 柳建 仝永刚 肖翊 杜娴 HUANG Shao-fu;WANG Xiao-long;LIU Jian;TONG Yong-gang;XIAO Yi;DU Xian(School of Mechanical Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China;National Engineering Research Center for Mechanical Product Remanufacturing of Army Armored Force Academy,Beijing 100072,China;School of Automotive and Mechanical Engineering,Changsha University of Technology,Changsha 410114,Hunan,China)

机构地区：[1]安徽理工大学机电工程学院,安徽淮南232001 [2]陆军装甲兵学院机械产品再制造国家工程研究中心,北京100072 [3]长沙理工大学汽车与机械工程学院,湖南长沙410114

出　　处：《铸造》2025年第2期194-202,共9页Foundry

基　　金：国家自然科学基金资助项目(52275228);国家自然科学基金青年科学基金项目(52105234,52205242);教育部联合基金资助项目(8091B032110)。

摘　　要：密封环是盾构机螺旋输送机上的主要零部件之一,面向高压、冲击和强磨损的严苛服役环境,密封环零件易发生磨损破环。选取螺旋输送机上已磨损密封环为基材,选用高硬度、耐磨性能优异的FeCoNiCrMnAl_(0.5)Si_(0.5)(AS1)高熵合金为熔覆层材料,研究分析等离子熔覆密封环-AS1熔覆层显微组织、物相和显微硬度;对室温下熔覆层的摩擦磨损性能进行测试,分析密封环-AS1熔覆层耐磨性能,探索密封环表面等离子熔覆高熵合金修复的可行性。试验发现,密封环显微组织主要为铁素体+珠光体+贝氏体,工作时出现粘着磨损和磨粒磨损。AS1熔覆层主要为等轴晶,其中熔覆层硬度最高(HV721.3),约为基材硬度的2倍。AS1双层熔覆层耐磨性较之基体提高了约10倍,主要磨损机理为磨粒磨损。采用等离子熔覆高熵合金修复密封环表面是一个非常可行的方案,对保证盾构机顺利运行具有重要意义。The sealing ring is one of the main components on the screw conveyor of the shield tunneling machine.Facing the harsh service environment of high pressure,impact,and strong wear,the sealing ring components are prone to wear and tear.Selecting the worn sealing ring on the screw conveyor as the substrate,and the FeCoNiCrMnAl_(0.5)Si_(0.5)(AS1)high entropy alloy with high hardness and excellent wear resistance as the cladding material,the microstructure,phase,and microhardness of the plasma cladding sealing ring AS1 cladding layer were studied and analyzed.Through testing the friction and wear performances of the cladding layer at room temperature,the wear resistance of the sealing ring AS1 cladding layer was analyzed,and the feasibility of plasma cladding high entropy alloy repair on the surface of the sealing ring was explored.It was found through experiment that the microstructure of the sealing ring is mainly composed of ferrite,pearlite and bainite,and adhesive wear and abrasive wear occur during operation.The AS1 cladding layer is mainly composed of equiaxed crystals,with the highest hardness(HV721.3),which is about twice the hardness of the substrate.The wear resistance of the AS1 double-layer cladding layer has increased by about 10 times compared to the substrate,mainly due to abrasive wear mechanism.Using plasma cladding high entropy alloy to repair the surface of the sealing ring is a very feasible solution,which is of great significance for ensuring the smooth operation of the shield tunneling machine.

关 键 词：等离子熔覆 高熵合金熔覆层 耐磨性能 密封环修复 熔覆层检测 

分 类 号：TG174.4[金属学及工艺—金属表面处理]