为提高H13模具钢的耐磨性能,利用激光熔覆技术,在H13钢表面制备了不同TiC含量的TiC/Ni基合金复合涂层,通过显微组织观察、硬度测试、滑动摩擦磨损试验方法对H13钢表面激光熔覆的不同复合涂层的组织及耐磨性能进行分析测试.结果表明,Ni60+ TiC激光熔覆涂层中物相主要为γ-(Fe,Ni)、Fe3C、Cr23C6、Ni2Si及TiC,激光熔覆层具有较高显微硬度,TiC的加入及含量增加可使熔覆层组织细化,复合熔覆层硬度提高,TiC含量为30％时熔覆层内平均硬度最大,为873 HV0.2;激光熔覆TiC+ Ni60复合涂层的耐磨性显著高于H13钢基体,随TiC含量增加而先增加后降低,TiC含量20％耐磨性较佳;H13钢基体的磨损机制主要以犁削、切削为主,激光熔覆TiC/Ni合金复合涂层以脆性剥落机制为主.
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