焊接电流对铁基硼化物涂层的组织性能影响  

Effect of Welding Current on Microstructure and Properties of Fe Based Boride Coatings

作　　者：陈宇豪 马宁[1,2] 杨林 贺雅净 杨帆 何文超 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]有色金属共性技术河南省协同创新中心,河南洛阳471023

出　　处：《南方金属》2018年第1期21-23,39,共4页Southern Metals

基　　金：河南科技大学大学生研究训练计划(SRTP)(2016018);河南省科技攻关计划项目(172102210259)

摘　　要：采用氩弧熔敷技术,Fe Ti70粉末和B粉作为预制合金粉,在Q235钢表面原位合成铁基硼化物涂层,研究焊接电流对复合涂层组织和性能的影响.对涂层进行一系列组织性能表征,利用X射线衍射仪分析涂层物相组成,利用光学显微镜观察组织形貌及分布,同时使用显微硬度计测量涂层硬度.结果表明,涂层中主要有Ti B2、Fe2B、Fe B、Ti B增强相;当焊接电流从120 A增加到150 A时,硼化物晶粒变得粗大;显微硬度从基体到涂层的顶端呈现梯度上升,并且涂层平均显微硬度为1165HV0.1,约为基体的5倍.FeTi70 alloy powder and B powder are used as the raw materials to make Fe based composite coatings on steel Q235 by tungsten inert gas cladding. The effects of welding current on the microstrueture and properties of composite coat- ings are investigated. Microstructure and properties of coatings are characterized with a series of methods. Phase composi- tion of coatings is analyzed with X-ray diffractometer. Microstructure of coatings is analyzed with scanning electron micro- scope, and microhardness is tested with MHV-2000 digital microhardness tester. The results show that the coatings are mainly consisted of TiB2, Fe2B, FeB and TiB reinforced phases. When the welding current increases from 120A to 150A, the boride grains in coatings will become coarser. The microhardness of coatings gradiently increases form the substrate to the top of coatings, and the average microhardness of the coating is 1165HV0. 1, which is about 5 times harder than the substrate.

关 键 词：氩弧熔敷 原位合成 焊接电流 硼化物 显微组织 

分 类 号：TG174.44[金属学及工艺—金属表面处理]