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用YAG激光器对表面汽蚀的2Cr13钢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。借助扫描电子显微镜(SEM)和能谱仪(EDS)对激光熔覆层进行组织及成分分析。研究结果表明,激光熔覆层硬度可达45～50 HRC,高于基底材料的硬度(35～40 HRC)。使用YAG固体激光对汽蚀叶片进行修复可以获得与母材冶金结合且无气孔、裂纹等缺陷的熔覆层,其组织主要是γ-Ni、Cr7C3、Ni2B、Ni3B以及少量的Cr2B和Cr3Si。
The surface cavitation 2Cr13 steel turbine blades were repaired by YAG laser, and the laser cladding of self-fluxing Ni-Cr-B-Si alloy powder was carried out by means of simultaneous powder feeding. The microstructure and composition of laser cladding layer were analyzed by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results show that the laser cladding hardness of 45 ~ 50 HRC, higher than the base material hardness (35 ~ 40 HRC). Using YAG solid laser to repair cavitation blades, the cladding layer can be obtained with metallurgical bonding without defects such as pores and cracks. The microstructure is mainly γ-Ni, Cr7C3, Ni2B, Ni3B and a small amount of Cr2B and Cr3Si.