18Cr2Ni4WA钢表面微束等离子熔覆Ni60合金层的性能  

Properties of Micro-Plasma Arc Cladding Ni60 Alloy Layer on the Surface of 18Cr2Ni4WA Steel

作　　者：夏成宝[1] 涂明武[1] 葛文军[1] 

机构地区：[1]空军第一航空学院,河南信阳464000

出　　处：《材料保护》2011年第8期69-71,91,共3页Materials Protection

摘　　要：过去,对飞机襟翼作动筒活塞磨损表面修复的研究较少。利用微束等离子弧热源在18Cr2Ni4WA基体表面制备了Ni60熔覆层,研究了熔覆层的形貌、成分、相结构、显微硬度、相对耐磨性及耐腐蚀性能。结果表明:熔覆层中有大量等轴晶,当熔覆扫描速度增加时枝状晶和柱状晶增多,熔覆层均匀、致密;熔覆层主要由γ-Ni,Ni3B,Cr21.34Fe1.66C6和Cr2B3相组成,扫描速度较低时还出现了γ-Fe相;熔覆层的硬度随扫描速度的增加先增加后减小;18Cr2Ni4WA基体经微束等离子熔覆处理后,耐磨性和耐腐蚀性能提高。Ni60 alloy cladding layer was prepared on the surface of 18Cr2Ni4WA steel by microplasma arc cladding. The morphology, composition, phase structure, microhardness, wear resistance and corrosion resistance of the cladding layer were also measured. Results show that asprepared Ni60 cladding layer contains a large amount of eqniaxial crystals, while the amounts of dendritical crystals and columnar crystals increase with increasing scanning rate for cladding. Asprepared Ni60 cladding layer was uniform and compact, and mainly consisted of γ-Ni, Ni3B, Cr21.34 Fe1.66 C6 and Cr2B3, while the one obtained at a smaller scanning rate contained γ-Fe as well. Besides, the microhardness of the Ni60 cladding layer initially rose but later declined with increasing scanning rate. Micro-plasma arc cladding helped to improve the wear resistance and corrosion resistance of 18Cr2Ni4WA steel substrate.

关 键 词：微束等离子熔覆 18CR2NI4WA NI60 组织结构 性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]