锰青铜表面激光熔覆镍基合金的微观组织

Microstructure of Laser Cladding Ni-Base Alloy on Manganese Bronze

用Rofin-Sinar CW025 YAG激光设备,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,获得了无气孔和裂纹缺陷的熔覆层。借助扫描电子显微镜(SEM,LEO1450)、能谱仪(EDS)、X射线衍射(XRD)对激光熔覆层进行组织、成分及物相分析。研究结果表明,激光熔覆层与C86300铜合金基体实现了良好的冶金结合,激光熔覆层组织主要是γ-Ni,Cr7C3,Ni2B,Ni3B以及少量CrB2和Cr3Si,并且实现了主要元素(Cr,Fe,Ni,Cu和Zn)从基体到熔覆层的梯度分布。

Wear-resistant coatings were fabricated by laser cladding with direct injection of the Ni-Cr-B-Si powder. Laser cladding was conducted with a Rofin Sinar CW025 YAG laser. Laser cladding coatings were characterized by scanning electron microscopy （SEM, LEO1450）, energy disperse spectroscopy （EDS） and X-ray diffraction （XRD）. The results show that there is a good metallurgical bonding between the coating and the C86300 bronze substrate without pores and cracks. The laser cladding Ni Cr-B-Si alloy coating was mainly γ-Ni, Cr7C3 , Ni2B, Ni3 B together with lesser proportions of CrB2 and Cr3 Si. The basic elements （Cr, Fe, Ni, Cu and Zn） content from the bronze substrate to the coatings vary regularly. Near the interface, the main elements are gradient distributed.