硼对液压支架立柱等离子熔敷涂层组织性能的影响  

Performance study of high boron clad layer welded by PTA on hydraulic support piston rod surface

作　　者：丁卫东[1] 栗卓新[1] 李国栋[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100024

出　　处：《焊接学报》2017年第4期77-80,共4页Transactions of The China Welding Institution

基　　金：先进焊接与连接国家重点实验室基金资助项目(AWJM13-01)

摘　　要：使用自制药芯焊丝等离子熔敷技术在液压支架立柱表面制备高硼熔敷层,分别研究了硼对熔敷层显微组织、结构、显微硬度、耐磨性、耐蚀性的影响.结果表明,四组高硼熔敷层成形良好,无裂纹,组织均匀致密.随硼含量的增加,熔敷层的显微硬度先增加后降低,最大为440 HV20,耐磨性与硬度呈对应关系;盐雾试验480 h后1号,2号熔敷层未出现腐蚀点,表现出良好的耐蚀性.综合分析表明,B元素含量为1.150%时,在保证硬度和耐磨性能的同时,盐雾腐蚀480 h未出现腐蚀点,满足液压支架立柱的使用要求.In this paper,plasma transferred arc welding(PTA)is used to prepare high boron clad layer on hydraulic support piston rod surface.The microstructural,component distribution,phase constitution,microhardness,wear resistance and corrosion resistance are analyzed.The results show that four high boron clad layers is formed well and no cracking,microstructure homogeneity are found.With the increase of the boron content,the microhardness of clad layer increases gradually with the maximum 440 HV20,and wear resistance increases first,then decreases.In salt spray test,No.1 and No.2 clad layers don't have corrosion points after480 hours,which shows the good corrosion resistance.Finally it is concluded that No.2 wire has high corrosion resistance which has well microhardness and wear resistance at the same time.It meets the demand of hydraulic support piston rod.

关 键 词：等离子熔敷 液压支架立柱 熔敷层 

分 类 号：TG422.3[金属学及工艺—焊接]