水导轴承等离子堆焊Ni60合金组织及其耐腐蚀性能  

Microstructure and Corrosion Resistance of Ni60 Alloy Overlay Deposited by PTA Method on Water Guide Bearing

作　　者：邓德伟[1,2,3] 牛婷婷 田鑫[2] 刘海英[1] 孙奇[2] 张林[2] DENG De wei;NIU Ting ring;TIAN Xin;LIU Hai ying;SUN Qi;ZHANG Lin(School of Materials Science and Engineering,Dalian University of Technology, Dalian 116024, Liaoning, China;R＆D Division of Shenyang Blower Works Group Corporation, Shenyang 110869, China;Key Laboratory o{ Solidi{ication Control and Digital Preparation Technology （Liaoning Province）, Dalian 116024, Liaoning, China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]沈阳鼓风机集团股份有限公司研究院,沈阳110869 [3]辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116024

出　　处：《材料工程》2018年第5期106-111,共6页Journal of Materials Engineering

基　　金：国家973项目(2011CB013402);辽宁省自然科学基金(2014028002);辽宁省科技创新重大专项(201303002);沈鼓-大工重大科研发展基金;辽宁重大装备制造协同创新中心;中央高校基本科研业务费专项资金资助项目

摘　　要：采用等离子堆焊技术在Z2CN18-10核电用不锈钢表面堆焊Ni60合金,并研究Ni60合金堆焊层的组织结构、硬度和耐蚀性能。结果表明:堆焊层组织主要由γ-Ni、碳化物、硼化物以及γ-Ni和硼化物的共晶组成,堆焊层的底层、中间层和顶层位置各相体积分数不同,中间层菊花状组织最多。Ni60堆焊层硬度约为500HV,明显高于Z2CN18-10不锈钢基体,菊花状共晶组织有助于提高堆焊层硬度。Ni60在硼酸中的钝化能力明显高于海水,且与Z2CN18-10不锈钢的自腐蚀电位差较小,不易发生电偶腐蚀。在模拟海水中堆焊层中间层耐腐蚀性能优于堆焊层的底部和顶部,与基体的自腐蚀电位差较大,容易出现电偶腐蚀。The Ni60 overlay was deposited on Z2CN18 10 stainless steel substrate by plasma trans ferred arc （PTA） method, and the microstructure, hardness and corrosion resistance of Ni60 overlay were investigated. The results show that the overlay mainly consists of Ni rich γ solid solution （γ-Ni）, borides and carbides, and γ-Ni and borides eutectic structure. The overlay from the top to hot tom shows different phase fractions, and the amount of chrysanthemum like structure in the middle is large. The hardness of Ni60 overlay is around 500HV, which is higher than that of Z2CN18 10 stain less steel. The hardness increase is attributed to the chrysanthemum like eutectic structure. In the bo rate, Ni60 exhibits higher passivation ability than that in seawater, and the corrosion potential of Ni60 alloy is similar to Z2CN18 10 stainless steel. In simulated seawater, the corrosion resistance of over lay in the middle is more superior than that in the bottom and top. Due to the large difference of corro sion potential in seawater, the galvanic corrosion is prone to occur between Ni60 overlay and Z2CN18 10 stainless steel.

关 键 词：等离子堆焊 NI60 显微组织 硬度 极化曲线 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG456.2[金属学及工艺—金属材料]