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为提高钢基材的耐磨性能,采用等离子堆焊技术,制备了原位自生M7C3-TiC增强铁基堆焊层。利用金相显微镜、扫描电镜、X射线衍射仪及显微硬度计对堆焊层的组织和性能进行了测试。结果表明:堆焊层与基体之间形成了良好的冶金结合;堆焊层表层组织由马氏体、(Fe,Cr)7C3和TiC构成;初生(Fe,Cr)7C3呈六边形,晶粒尺寸较大,均匀弥散分布在堆焊层中,TiC颗粒呈开花状、立方体或团聚状;堆焊层硬度从基体到表面呈合理的梯度分布,较基体有显著提高。
In order to improve the wear resistance of steel substrate, the in-situ self-generated M7C3-TiC reinforced iron based surfacing layer was prepared by plasma surfacing technology. The microstructure and properties of the overlay were tested by optical microscope, scanning electron microscopy, X-ray diffraction and microhardness tester. The results show that a good metallurgical bond is formed between the overlay and the substrate. The surfacing layer consists of martensite, (Fe, Cr) 7C3 and TiC. The primary (Fe, Cr) 7C3 is hexagonal, The grain size is larger and uniformly distributed in the surfacing layer. The TiC grains are flowering, cube or agglomeration. The hardness of the surfacing layer shows a reasonable gradient distribution from the matrix to the surface, which is significantly higher than that of the matrix.