摘要
煤灰颗粒冲刷、黑水汽化引起的腐蚀等对黑水角阀服役寿命具有不利影响。采用等离子堆焊工艺方法,在黑水角阀F22材质密封件表面堆焊Co112硬质合金,考察堆焊层数对显微组织、元素分布和维氏硬度的影响。研究发现:1)第二次堆焊在第一次堆焊基础上施加了一次热处理,共晶成分占比高于第一堆焊层,树枝晶组织被细化,交界处有明显的组织转变区;2)熔合线附近处有柱状组织,以Cr元素为主,堆焊两层后,第一堆焊层Cr元素含量提高;3)相较于堆焊一层,堆焊两层的显微硬度平均值提高11.6%,最大值提高8.1%。进一步分析得知:第二次堆焊起到了固溶强化、细晶强化等作用,堆焊“第二韧劲”对第一堆焊层的性能起到了改善作用,使得黑水角阀更好满足服役要求。
The erosion of coal particles and the corrosion caused by the blackwater vaporization have adverse effects on the service life of blackwater angle valve.The Co112 hard metal was deposited on the surface of F22 seal of blackwater angle valve by plasma transferred arc welding,and the effects of surfacing layers on the microstructure,element distribution and Vickers hardness were investigated.Findings:1) The second surfacing is subjected to a heat treatment on the basis of the first surfacing,the eutectic composition ratio is higher than that of the first surfacing,the dendrite structure is refined,and there is an obvious microstructure transformation zone at the junction.2) There is a columnar structure near the fusion line,which is dominated by Cr element.After surfacing two layers,the content of Cr element in the first surfacing layer increases.3) Compared with the surfacing layer,the average and maximum microhardness of the surfacing layers are increased by 11.6% and 8.1%,respectively.Further analysis shows that the second surfacing plays the role of solid solution strengthening and fine grain strengthening,and the “second toughness” of the surfacing improves the performance of the first surfacing layer,which makes the blackwater angle valve better meet the service requirements.
作者
王建龙
徐喜龙
王媛媛
马超
万泓明
邓德伟
WANG Jianlong;XU Xilong;WANG Yuanyuan;MA Chao;WAN Hongming;DENG Dewei(Wuzhong Instrument Co.,Ltd.,Wuzhong 75110o,China;Research Center of Laster 3D Printing Equipment and Application Engineering Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《工业技术创新》
2022年第4期39-47,共9页
Industrial Technology Innovation
基金
高端控制阀产业技术协同创新中心基金(2018WZ003)
辽宁重大装备制造协同创新中心基金(DUT2017031)。
关键词
黑水角阀
等离子堆焊
显微组织
维氏硬度
Co112硬质合金
Blackwater Angle Valve
Plasma Transferred Arc Welding
Microstructure
Vickers Hardness
Co112 Hard Metal
作者简介
王建龙(1995-),男,助理工程师。主要研究方向:焊接技术与工程;徐喜龙(1988-),男,工程师。主要研究方向:机械设计制造及其自动化;王媛媛(1989-),女,工程师。主要研究方向:焊接工艺技术;马超(1997-),男,助理工程师。主要研究方向:机械设计制造技术;万泓明(1999-),男,大连理工大学在校研究生。研究方向:材料表面工程;通信作者:邓德伟(1974-),男,博士,副教授,硕士生导师。主要研究方向:机械装备再制造、材料表面工程及金属3D打印等。E-mail:deng@dlut.edu.cn。
