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通过激光熔覆在低碳钢表面获得Fe-Ti-V-C铁基熔覆层,利用X射线衍射(XRD)、光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)、显微硬度计和磨粒磨损试验机,分析比较了熔覆粉末中不同的石墨添加量对Fe-Ti-V-C熔覆层物相组成、硬度和耐磨性的影响.结果表明:熔覆层中碳化物为均匀分布的TiVC2和VC.TiVC2呈多角块状或枫叶状,VC呈小块状或细长条状,且碳化物数量随石墨加入量的增加而增加.熔覆粉末中石墨添加量过多时,熔覆层中出现残余奥氏体.一定范围内,熔覆层的硬度与耐磨性随石墨加入量的增加呈现先显著提高后降低的趋势.进行多层熔覆时存在回火软化现象,且熔覆层硬度越高回火软化现象越明显.
The Fe-Ti-VC iron-based cladding layer was obtained by laser cladding on the surface of mild steel. The microstructure of the Fe-Ti-VC coating was characterized by X-ray diffraction, optical microscope, Microhardness tester and abrasive wear tester were used to analyze the effects of different graphite additions on the phase composition, hardness and wear resistance of the Fe-Ti-VC coatings.The results show that in the coatings Carbides were uniformly distributed TiVC2 and VC.TiVC2 was polygonal block or maple leaf, VC was small lumps or slender strip, and the amount of carbide increased with the addition of graphite increased the amount of graphite coating powder When too much, the residual austenite appears in the cladding layer, and within a certain range, the hardness and wear resistance of the cladding layer increase significantly and then decrease with the addition of graphite.Teaching Softening phenomenon, and the higher the hardness of the coating temper softening the more obvious.