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采用激光熔覆技术在Q235钢表面制备了Fe-Ti-V-B-C合金系的陶瓷相颗粒增强涂层,利用X射线衍射(XRD)、光学显微镜(OM)、扫描电镜(SEM)、显微硬度计及磨损试验机等测试与分析方法,研究了不同硼铁加入量对熔覆层组织与性能的影响。结果表明,熔覆层成形好,表面无夹渣,且与母材呈良好冶金结合。硼的加入,细化了涂层中均匀分布的陶瓷相颗粒,同时使基体组织由针状铁素体组织转变为珠光体和高碳马氏体组织。随着硼铁加入量的增加,涂层显微硬度随之提高,当硼铁加入质量分数达到25%时,涂层出现纵向裂纹。通过耐磨损性能测试,硼铁加入质量分数为20%涂层的磨损量仅约为母材的1/10。
The Fe-Ti-VBC alloy-based ceramic phase particle reinforced coatings were prepared on the surface of Q235 steel by laser cladding. The microstructure of the Q235 steel was characterized by X-ray diffraction (XRD), optical microscope (OM), scanning electron microscope And wear tester and other test and analysis methods to study the different amount of ferroboron on the microstructure and properties of the coating. The results show that the cladding layer is well formed, with no slag on the surface and good metallurgical bonding with the base metal. Boron is added to refine the uniform distribution of ceramic phase particles in the coating, while the matrix microstructure changes from acicular ferrite to pearlite and high-carbon martensite. With the increase of the amount of ferroboron, the microhardness of the coating increases. When the mass fraction of ferroboron reaches 25%, the longitudinal cracks appear in the coating. Through the wear resistance test, the wear amount of the ferroboron added into the mass fraction of 20% is only about 1/10 of that of the base material.