激光熔覆和TIG堆焊Fe55合金涂层组织与性能对比研究  

Comparative Study on Microstructure and Properties of Fe55 Alloy Coating by Laser Cladding and TIG Surfacing

作　　者：邸云鹏 尹桂丽[1] 徐瑞强 王磊 高涵 王旭 Di Yunpeng;Yin Guili;Xu Ruiqiang;Wang Lei;Gao Han;Wang Xu(College of Materials Science and Engineering,Liaoning University of Technology,Jinzhou,Liaoning 121001,China)

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001

出　　处：《应用激光》2022年第4期35-40,共6页Applied Laser

基　　金：辽宁省教育厅科学研究项目(JJL202015408);大学生创新创业训练计划项目(202010154004)。

摘　　要：采用激光熔覆和钨极氩弧堆焊方法在Q235钢基体表面分别制备Fe55合金涂层。应用金相、X射线衍射、显微硬度及磨粒磨损等分析手段对涂层的组织和性能进行研究。结果表明,激光熔覆和TIG堆焊涂层的稀释率分别为4.42%和7.65%,并且两个涂层均由α-Fe固溶体和原位合成的颗粒增强相CrFeB、CrC、(Cr, Fe)C及FeB等组成;以树枝晶和胞状晶为主的激光熔覆涂层组织比以等轴晶和胞状晶为主的TIG堆焊涂层组织细小致密;激光熔覆涂层的显微硬度和耐磨性均优于TIG堆焊涂层,平均显微硬度约为664 HV,磨损方式主要为显微切削。Fe55 alloy coatings were prepared on Q235 steel substrate by laser cladding and TIG surfacing, respectively. The microstructure and properties of the coating were studied by means of OM, X-ray diffraction, microhardness and abrasive wear. Results show that the dilution ratios of laser cladding and TIG surfacing coatings are 4.42% and 7.65%, respectively, and they are composed of α-Fe solid solution and in-situ synthesized particle reinforced phases, such as CrFeB,CrC,(Cr, Fe)Cand FeB. The microstructure of laser cladding coating is mainly dendrite and cellular crystal, and the microstructure of TIG surfacing coating is mainly equiaxed crystal and cellular crystal. The microstructure of laser cladding coating is finer and denser than that of TIG surfacing coating. The microhardness and wear resistance of laser cladding coating are better than those of TIG surfacing coating, and the average microhardness is about 664 HV, and the main wear mode is micro cutting.

关 键 词：激光熔覆 钨极氩弧堆焊 Fe55合金 显微硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]