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采用激光预置熔覆技术,通过在FeCSiBRe合金粉末中单独添加强碳化物形成元素Zr和复合添加Zr、Ti、WC元素和碳化物,在中碳钢基体上制备出原位析出的颗粒增强铁基复合材料表层。利用光学显微镜、扫描电子显微镜(SEM)、能谱仪(EDAX),对熔覆层显微组织特征以及硬质颗粒的分布规律进行了观察、分析;利用显微硬度计检测了熔覆层的显微硬度。熔覆层显微组织特征是树枝状的先共晶奥氏体分布在共晶基体上的亚共晶组织。熔覆层与基体成良好的冶金结合且未观察到裂纹和孔隙。熔覆层内析出的硬质颗粒分别是以ZrC和Zr、Ti、W为主的复合碳化物,由于凝固前沿对颗粒的特殊扑获作用,主要分布在枝晶内与枝晶间。
Laser pre-cladding technique was used to prepare in-situ precipitated particulate reinforced iron on the medium carbon steel by adding a strong carbide into the FeCSiBRe alloy powder to form elemental Zr and compounding with Zr, Ti, WC and carbide. Matrix composite surface. The microstructure and the distribution of the hard particles were observed and analyzed by optical microscope, scanning electron microscope (SEM) and energy dispersive spectrometer (EDAX). The microstructure of the cladding layer Microhardness. The microstructure of the coating is a hypoeutectic structure with dendritic, pre-eutectic austenite distributed on the eutectic matrix. The cladding is in good metallurgical bonding with the matrix and no cracks and voids are observed. The hard particles precipitated in the cladding are ZrC and Zr, Ti, W-based composite carbides, respectively, because of the special role of the solidification front on the particles, mainly in the dendrites and dendrites.