摘要
针对老旧柴油发动机肩胛密封面腐蚀损伤修复难的问题,选用HS121镍基合金焊丝作为焊接修复材料,采用类激光焊接技术对其进行修复。使用光学显微镜、X射线应力测定仪(XPS)、电化学工作站、高频往复摩擦磨损试验机、扫描电镜(SEM)和激光三维形貌仪对堆焊修复层截面微观组织形貌、残余应力、耐腐蚀和抗磨损性能等进行了观察和测试。结果表明,类激光堆焊修复层与母材属冶金结合,且无明显焊接缺陷;堆焊修复层表面的残余应力为普通氩弧焊的16%,腐蚀速率为基体的19.88%,耐磨性较基体提高了2.66倍。此外,修复层的自腐蚀电位正于发动机基体材料,自腐蚀电流密度值约为基体材料的1/2。
This paper proposes to employ the like-laser welding technology to repair corrosion damageson the cylinder scapular sealing surface of the diesel engine by using HS121 Ni-based alloy welding wire. The properties of the repaired layer by the like-laserwelding high-energy pulse precision cold repairing （LHPPCR）technology, including the microstructure morphology, the residual stress, corrosion, and the wear resistance, were investigated by optical microscopy, XPS, electrochemical workstation, friction and wear test, SEM and laser three-dimension morphology. The results show that the repairing layer by the LHPPCR and the substrate take the shape of jagged metallurgical bonding. The residual stress of the repaired layer by the LHPPCR was 16% lower than that by the ordinary argon arc welding. The corrosion rate of the repaired layer was 19.88% of that of the suhstrate, and the wear resistance was 2.66 times higher than that of the substrate. In addition, the corrosion potentialof the repaired layer is more positive than that of the substrate, and the corrosion current densityvalue is half of that of the substrate.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2015年第1期115-121,共7页
China Surface Engineering
关键词
类激光
堆焊
修复
柴油发动机
密封面
腐蚀
like-laser
welding
repair
diesel engine
sealing surface
corrosion
