摘要
目的针对低碳钢零件的破损失效采用TIG焊电弧熔覆增材制造工艺,研究低碳钢电弧熔覆修复使其达到再制造零件性能要求的可行性,为实现TIG焊修复应用提供保证。方法通过TIG焊熔覆在低碳钢坡口处,对熔覆接头的显微组织进行分析,并测试修复后的增材层表面硬度性能。使用Nanovea Tribometer摩擦磨损仪和NanoveaPS50表面轮廓仪,对基体和增材层进行摩擦性能测试,并表征摩擦磨损后的表面形貌,探究磨损机理。采用电化学工作站对基体和增材层的腐蚀性能进行分析。结果修复后的增材层显微硬度(220.17HV)高于基体且其摩擦性能和腐蚀性能优于基体,随着磨损载荷的增加,增材层的摩擦系数逐渐降低,磨损机制主要为磨粒磨损和粘着磨损。增材层表面组织均匀细小,在NaCl溶液中点蚀坑小且分散,增材层的腐蚀电流密度(1.8349×10^-6 A/cm^2)小于基体的腐蚀电流密度(6.5251×10^-5 A/cm^2),增材层表面的抗腐蚀能力明显提高。结论电弧熔覆低碳钢可满足低碳钢零部件现场电弧快速修复对再制造性能的要求,实现了低碳钢破损零部件的表面修复与强化。
The work aims to study the feasibility of low carbon steel arc welding repair to meet the performance requirements of remanufactured parts through TIG welding arc cladding additive manufacturing process for the damage loss of low carbon steel parts and then ensure the application of TIG welding repair.The microstructure of the welded joint was analyzed by TIG welding on the groove of the low carbon steel,and the surface hardness of the repaired additive layer was tested.The substrate and the additive layer were tested for friction properties by a Nanovea Tribometer friction wearer and a NanoveaPS50 surface profiler.The surface morphology after friction and wear was characterized and the wear mechanism was investigated.The corrosion performance of the substrate and the additive layer was analyzed by an electrochemical workstation.The repaired layer had a microhardness of 220.17HV higher than that of substrate and its friction and corrosion performance was also better than that of substrate.As the wear load increased,the friction coefficient of the additive layer decreased gradually.The wear mechanism was mainly abrasive wear and adhesion abrasion.The surface of the additive layer was uniform and fine.The pitting pit was small and dispersed in the NaCl solution.The corrosion current density of the additive layer(1.8349×10^-6 A/cm^2)was smaller than that of substrate(6.5251×10^-5 A/cm^2)and the corrosion resistance of the additive layer surface was significantly improved.Arc-clad low carbon steel can meet the requirements of remanufacturing performance of on-site arc rapid repair of low carbon steel parts,and realize the surface repair and strengthening of damaged parts of low carbon steel.
作者
薛冰
雷卫宁
刘骁
陈世鑫
XUE Bing;LEI Wei-ning;LIU Xiao;CHEN Shi-xin(Jiangsu University of Technology,Changzhou 213001,China;Jiangsu Key Laboratory of Advanced Materials Design and Additive Manufacturing,Changzhou 213001,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2020年第9期225-232,共8页
Surface Technology
基金
国家自然科学基金项目(51275222)
江苏省自然科学基金项目(BK20161198)
江苏省研究生实践创新项目(SJCX19-0726)。
关键词
增材层
电弧熔覆
摩擦磨损
磨损机制
腐蚀性能
再制造
additive layer
arc welding
friction and wear
wear mechanism
corrosion performance
remanufacturing
