FV520B钢表面熔化极气体保护焊堆焊层及其激光淬火后的组织与性能  

Microstructure and Properties of Fusion Electrode Gas Shielded Weld Surfacing Layer on FV520B Steel Surface Before and After Laser Quenching

作　　者：邓德伟[1] 孟凡民 汪红所 陈文博 孙磊 DENG Dewei;MENG Fanmin;WANG Hongsuo;CHEN Wenbo;SUN Lei(Liaoning Province Laser 3D Printing Equipment and Application Professional Technology Innovation Center,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;Dalian Marine Valve Co.,Ltd.,Dalian 116026,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁省激光3D打印装备及应用专业技术创新中心,大连116024 [2]大连船用阀门有限公司,大连116026

出　　处：《机械工程材料》2024年第5期105-110,共6页Materials For Mechanical Engineering

基　　金：高端阀产业技术协同创新中心基金资助项目(2022DMV003);辽宁省激光3D打印装备及应用专业技术创新中心基金资助项目(DUT2022031)。

摘　　要：采用熔化极气体保护焊在FV520B钢板上进行单层单道、二层多道以及三层多道同质堆焊试验,并对单层单道堆焊层进行激光淬火处理,研究了不同堆焊层和激光淬火后堆焊层的显微组织、硬度和耐腐蚀性能。结果表明:堆焊层由板条状马氏体、少量δ铁素体和一些碳化物组成,显微硬度为350 HV,与母材相比提高了14.7%,层间和道间交界处的组织中δ铁素体减少,最高硬度分别为380.3,373.5 HV,相对于堆焊层提高了8.0%,6.7%左右;堆焊层的腐蚀速率低于母材,且随着堆焊层数的增加,腐蚀速率不变。激光淬火后堆焊层的马氏体组织更加细小,淬火区和热影响区的厚度分别为194.3,186.3μm,堆焊层的最高硬度提高至390.4 HV;随着距淬火表面距离的增大,硬度先升高后降低;激光淬火后堆焊层的腐蚀速率比未进行激光淬火的堆焊层低。Single-layer single-pass,two-layer multiple-pass,and three-layer multiple-pass homogeneous overlay tests were conducted on FV520B steel plate by melting electrode gas shielded welding.The laser quenching treatment was applied to the single-layer single-pass surfacing layer.The microstructure,hardness,and corrosion resistance of different surfacing layers and laser quenched surfacing layers were studied.The results show that the surfacing layer consisted of lath martensite,a small amount ofδferrite and some carbides,and the microhardness was 350 HV,which was 14.7%higher than that of the base metal.Theδferrite in the microstructure of interface of interlayer and interpass decreased.The highest hardnesses at the interlayer and interpass interfaces reached 380.3,373.5 HV,which were about 8.0%and 6.7%higher than that of the surfacing layer,respectively.The corrosion rate of the surfacing layer was lower than that of the base metal,and as the number of surfacing layers increased,the corrosion rate remained unchanged.After laser quenching,the martensite of the surfacing layer became finer,and the thicknesses of the quenching zone and the heat affected zone were 194.3,186.3μm,respectively.The highest hardness of the surfacing layer after laser quenching increased to 390.4 HV,and as the distance from the quenched surface increased,the hardness first increased and then decreased.The corrosion rate of the surfacing layer after laser quenching was lower than that without laser quenching.

关 键 词：FV520B钢 同质堆焊 激光淬火 组织 硬度 耐腐蚀性能 

分 类 号：TG178[金属学及工艺—金属表面处理]