采用钛铁、硼铁为预置粉末,利用激光熔覆搭接技术在碳钢基体上制备了Fe-Ti-B系原位自生颗粒增强Fe基复合涂层.利用X射线衍射仪、光学显微镜、扫描电镜、电子探针对熔覆层的相组成和显微组织进行了研究,并用洛氏硬度计测量了涂层硬度.结果表明,涂层中原位自生的增强粒子包括TiB2、FeB、Fe2B和Fe2 Ti.且随着涂层中Ti,B原子比例的不同,涂层的相结构发生相应演变.当涂层增强相为FeB+Fe2B+TiB2和TiB2+Fe2Ti时,涂层的塑性降低,在激光熔覆应力的作用下产生裂纹,当涂层增强相为Fe2B+TiB2及TiB2,可获得致密、无缺陷的熔覆层.同被强化基体相比,熔覆层硬度有较大提高,且增强相为FeB+Fe2B+TiB2的涂层具有最高的硬度.
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