不同镍基合金等离子堆焊层的微观组织及性能  

Microstructure and Properties of Ni-based Alloy Hardfacing Prepared by Plasma Transferred Arc Welding

作　　者：胡建军[1,2] 陈国清[2] 李闪[2] 周文龙[2] 

机构地区：[1]萍乡高等专科学校机电系,江西萍乡337055 [2]大连理工大学材料科学与工程学院,辽宁大连116085

出　　处：《热加工工艺》2013年第3期151-155,共5页Hot Working Technology

基　　金：江西省自然科学基金资助项目(2011ZBAB205038);国家973计划项目(2009CB724305);新世纪优秀人才支持计划资助项目(NCET-10-0278)

摘　　要：采用等离子弧堆焊技术在1Cr18Ni9Ti不锈钢表面分别堆焊Ni40A、Ni50A、Ni60A镍基合金粉末,研究不同镍基合金堆焊层的显微组织、硬度及磨损性能。结果表明,堆焊层基体都是由γ-Ni组成,Ni40A堆焊层中析出相主要是Cr7C3、M23C6、Ni3Si,而Ni50A和Ni60A堆焊层中析出相由CrB、M23(C,B)6、Cr7C3、Cr5B3、Ni3Si组成。Ni60A堆焊层的显微硬度最高,达780HV。耐磨性Ni60A>Ni50A>Ni40A。Ni60A堆焊层的摩擦系数最大,而Ni40A和Ni50A差别不大。Ni40A, Ni50A, Ni60A alloy powders were deposited on the surface of 1Cr18Ni9Ti stainless steel by plasma transferred arc welding. The microstructure, microhardness and wear properties of the hardfacing were characterized. The results show that the hardfacing of Ni40A mainly consists of y-Ni, precipitating CrTC3,M23C6 and Ni3Si, the hardfacing of Ni50A and Ni60A mainly consists of y-Ni, precipitating CrB,M23 （C,B）6,CrTC3,CrsB3and Ni3Si. The highest microhardness of Ni60A alloy hardfacing is 780 HV. The wear resistance of Ni60A hardfacing is more excellent than that of Ni50A, and the Ni40A alloy hardfacing has the worst wear resistance. The friction coefficient of Ni60A is highest, then the Ni40A and Ni50A has almost none difference.

关 键 词：等离子堆焊 镍基合金 电流 显微组织 磨损 

分 类 号：TG455[金属学及工艺—焊接] TG174.44