焊接材料对UMCo50堆焊层显微组织及高温性能的影响  

Effect of Welding Material on Microstructure and High Temperature Performance of UMCo50 Overlay Layer

作　　者：熊江 辛争秋 李文朝 薛海涛 唐强 XIONG Jiang;XIN Zhengqiu;LI Wenzhao;XUE Haitao;TANG Qiang(CNOOC Huizhou Petrochemicals Company Limited,Huizhou 516000,China;Hebei University of Technology,Tianjin 300400,China;Beijing Aerospace Petrochemical Technology Energy Conservation and Environmental Protection Corporation Limited,Beijing 100166,China)

机构地区：[1]中海油惠州石化有限公司,广东惠州516000 [2]北京航化节能环保技术有限公司,天津300400 [3]河北工业大学,北京100166

出　　处：《热加工工艺》2024年第21期130-136,共7页Hot Working Technology

摘　　要：为了提高堆焊修复后煤浆进料燃烧混合器的使用寿命,设计了4种堆焊焊丝作为填充材料,与UMCo50焊丝进行对比,采用TIG焊方法在UMCo50板材上堆焊制备堆焊层。通过高温氧化试验、高温熔盐腐蚀试验以及高温磨损试验,对5种焊丝堆焊层的高温耐腐蚀、高温耐氧化、高温耐磨损性能进行了对比研究,并通过X射线衍射分析测试(XRD)、扫描电镜(SEM)及能谱测试(EDS)等方法对堆焊层微观组织及相组成进行了分析。结果表明:UMCo50堆焊层微观组织是具有胞状亚结构的平面晶,基体全部是钴基固溶体;设计的四种焊丝的堆焊层微观组织以树枝状的钴基固溶体为主,树枝晶之间分布有碳化物及低熔点共晶物。焊丝中添加W、Mn、Si等元素的固溶强化和析出的WC形成的第二相强化可提高堆焊层的硬度及耐磨性;提高Cr含量和降低Fe含量,可提高堆焊层的高温抗氧化性及耐蚀性。In order to improve the service life of the coal slurry feed combustion mixer after overlay welding repair,four kinds of overlay welding wires were designed as filler materials,compared with UMCo50 welding wire,and the TIG welding method was used to prepare overlay welding layer on UMCo50 plate.Through high-temperature oxidation test,high-temperature molten salt corrosion test and high-temperature wear test,the high-temperature corrosion resistance,high-temperature oxidation resistance,high-temperature wear resistance of the five kinds of welding wire overlay layer were compared and studied,and X-ray diffraction analysis test(XRD),scanning electron microscopy(SEM)and energy spectroscopy(EDS)were used to analyze the microstructure and phase composition of the overlay layer.The results show that the microstructure of UMCo50 overlay layer is a planar crystal with a cyto-like substructure,and the matrix is all cobalt-based solid solution.The microstructure of the surfacing layer of the four types of welding wires designed is mainly dendritic cobalt-based solid solution,and carbides and low melting eutectices are distributed between dendrites.The solution strengthening of W,Mn,Si and other elements added to the welding wire and the second phase strengthening formed by the precipitated WC can improve the hardness and wear resistance of the surfacing layer,increasing Cr content and reducing the Fe content can improve the high temperature oxidation resistance and corrosion resistance of the overlay layer.

关 键 词：UMCo50 焊丝 堆焊 高温性能 

分 类 号：TG422.3[金属学及工艺—焊接]