汽轮机汽蚀叶片的激光宽带熔覆修复  

Wide-strip Laser Clad Repairing Water-eroded Steam Turbine Blades

作　　者：杨胶溪[1] 闫婷[1] 王喜兵[1] 陈虹[1] 左铁钏[1] 

机构地区：[1]北京工业大学激光工程研究院,北京100022

出　　处：《应用激光》2007年第3期205-208,212,共5页Applied Laser

基　　金：国家科技计划"973"项目"材料短流程制备与成形加工的科学技术基础"子课题"梯度复合材料制备与成形一体化的技术基础"的支持;项目编号:2006CB605206-3

摘　　要：利用激光宽带熔覆技术对表面汽蚀的汽轮机叶片进行修复。采用同步送粉的方式进行自熔性Ni-Cr-B-Si合金粉末的激光熔覆,获得耐磨涂层。实验所用设备为TRUMPF-6000 CO2激光器,利用积分镜对激光束进行整形获得宽带激光束,借助扫描电子显微镜(SEM,LEO 1450)和能谱仪(EDS)对激光熔覆层进行组织结构及成分分析。研究结果表明,激光熔覆层硬度可达HRC45-50,高于其基底材料2Cr13的硬度(HRC35-40)。熔覆层的组织结构受到熔覆工艺参数的影响很大,采用最优化工艺参数形成的熔覆层结构均匀,与母材冶金结合良好,且无气孔或裂纹缺陷。The water eroded steam turbine engine blades were repaired by wide-strip laser cladding technique. Wear-resistant coatings were fabricated by laser cladding with direct injection of the Ni-Cr-B-Si powder into the molten pool. Laser cladding was conducted with a TRUMPF-6000 CO2 laser and the beam was shaped by integral mirror. Laser cladding coatings were characterized by scanning electron microscopy （SEM, LEO 1450） and EDX. It was investigated that the laser cladding coatings has a higher hardness value （HRC45-50） compared with that of the substrate material 2Cr13（HRC35-40）. The results demonstrated that microstructure of the clad layer was greatly affected by the processing parameters. The layer produced under the optimized processing conditions had uniform structure and excellent bonding with the substrate and was free of pores and cracks.

关 键 词：激光宽带熔覆 汽轮机 叶片 积分镜 组织结构 

分 类 号：TM611.24[电气工程—电力系统及自动化]