Y2O3对Fe-Al-Si-B等离子熔覆层组织与性能的影响

The Effect of Y2O3 on the Microstructure and Properties of the Fe-Al-Si-B Cladding by Plasma Transferred Arc

摘要:

采用等离子弧熔覆技术，在Q235基体钢板表面熔覆了一层Fe-Al-Si-B原位复合涂层，并通过在熔覆粉末中添加稀土氧化物Y2O3改善熔覆层的组织与性能。利用光学显微镜(OM) 、扫描电镜( SEM) 、X射线衍射仪( XRD)、显微硬度仪、摩擦磨损试验机对熔覆层的组织、相组成、显微硬度及磨损性能进行了分析。结果表明：Y2O3的加入净化了晶界，使得晶界处夹杂物均匀化，明显改善了晶界处夹杂物的形态，形成了致密均匀、无缺陷且显著细化的熔覆层组织。当稀土氧化物Y2O3含量为0.9%时，熔覆层的硬度达到510HV，耐磨性能达到最佳。

Abstract:

The effect of Y2O3 on the microstructure and properties of the Fe-Al-Si-B cladding by plasma transferred Arc was investigated. Fe-Al-Si-B in situ composite coating was prepared with plasma arc cladding on Q235 steel substrate. Moreover, rare earth oxide Y2O3 powder was added to the cladding powder in order to improve the microstructure and properties of the coating. The microstructure, phase constituent, microhardness and wear property of the coating were examined by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), micro hardness tester, friction and wear tester. The result indicated that the addition of Y2O3 can purify the grain boundaries and homogenize the inclusions, thus the shape and distribution of the inclusions were improved significantly. Furthermore, A dense, uniform, defect-free and significantly refined coating was then formed. When the content of Y2O3 reached 0.9%, the hardness of the coating reached 510HV, and the optimum wear resistance was obtained.