电站循环流化床锅炉水冷壁用HDS65焊丝防磨堆焊层的组织与性能  

Microstructure and Properties of HDS65 Wire Surfaced Wear-Resistant Layer for Water Wall of Circulating Fluidized Bed Boiler in Power Plant

作　　者：李新平 高原 LI Xinping;GAO Yuan(College of Engineering and Technology,Nanchang Vocational University,Nanchang 330500,China;Jiangxi Hengda Hi-Tech Co.,Ltd.,Nanchang 330096,China)

机构地区：[1]南昌职业大学工程技术学院,南昌330500 [2]江西恒大高新技术股份有限公司,南昌330096

出　　处：《机械工程材料》2025年第3期36-40,共5页Materials For Mechanical Engineering

基　　金：江西省绿色技术创新企业资助项目(S2021LSQYG0073)。

摘　　要：研制了一种电站循环流化床锅炉水冷壁防磨堆焊层用铁基药芯焊丝(HDS65焊丝),采用CO_(2)气体保护焊在20G钢基材上进行单层多道堆焊试验,研究了焊丝的焊接工艺性以及堆焊层的成形质量、显微组织和高温摩擦磨损行为。结果表明:HDS65焊丝的焊接工艺性良好,焊道成形美观,堆焊层内外均无气孔和裂纹缺陷;堆焊层组织主要由板条马氏体、以金属间化合物FeCr为溶剂的固溶体及不连续分布的细小碳化物组成。堆焊层的硬度较高,在630~690 HV;与YD490焊丝堆焊层相比,350,600℃下HDS65焊丝堆焊层的冲蚀磨损量更低,耐冲蚀磨损性能更优;随着温度的升高,HDS65焊丝堆焊层的冲蚀磨损量增大,耐冲蚀磨损性能变差,摩擦因数降低,600℃时低至0.2~0.3,远低于20G钢基材,磨损体积增大,600℃时为0.628 mm^(3),仅约为20G钢基材的1/2。A kind of iron-based flux-cored wire(HDS65 welding wire)for wear-resistant surfacing layer of water wall of circulating fluidized bed boiler in a power plant was developed.The single-layer multi-pass surfacing welding test was carried out on 20G steel substrate by CO_(2)shielded arc welding,and the weldability of the welding wire and the forming quality,microstructure and high temperature friction and wear behavior of the surfacing layer were studied.The results show that the weldability of HDS65 welding wire was good,and the weld bead was formed well.There were no pores and cracks inside and outside the surfacing layer.The microstructure of surfacing layer was mainly composed of lat martensite,solid solution based on intermetallic compound FeCr and discontinuously distributed fine carbides.The hardness of the surfacing layer was high,in the range of 630‒690 HV.Compared with that of YD490 wire surfacing layer,the erosion wear amount of HDS65 wire surfacing layer was lower,the degradation rate was slower,and the erosion wear resistance was better at 350℃and 600℃.With the increase of temperature,the erosion wear amount of HDS65 wire surfacing layer increased,indicating that the erosion wear resistance became worse;the friction factor decreased,reaching 0.2‒0.3 at 600℃,which was much lower than that of 20G steel substrate;the wear volume increased,which was 0.628 mm3 at 600℃,only about 1/2 of that of 20G steel substrate.

关 键 词：循环流化床锅炉 CO_(2)气体保护焊 药芯焊丝 显微组织 摩擦磨损性能 

分 类 号：TM621.2[电气工程—电力系统及自动化] TG422.3[金属学及工艺—焊接] TG17