采用XRD,SEM和EDS分析了机械振动辅助激光熔覆NiCrBSi-TiC颗粒增强复合涂层中外加TiC颗粒和内生M23C6碳化物的生长形态、形成机制及其在γ-Ni固溶体间的分布特征.结果表明,熔池内大部分外加TiC颗粒在熔覆过程中溶解,溶解于镍基合金熔体中的过饱和Ti和C原子在冷却过程中又形成TiC颗粒,并以共晶方式析出,其通过M23C6型碳化物为核心异质形核,并侧向生长；同时,出现以TiC为心部,以(Ti,Cr,Ni,Fe,Si)C为外围包覆结构的复式碳化物.在振动作用下,底部粗大枝晶状共晶组织消失,振动引起的流体平流层使底部TiC颗粒上浮趋势减缓,出现双颗粒和花瓣状多颗粒TiC粒子簇.振动作用使熔覆层区域内的组织得到细化,枝晶间网状(Fe,Ni)固溶体中Cr含量升高,TiC颗粒析出增多,颗粒尺寸增加,平均粒径增加超过25％.从XRD谱可观察到,振动作用使涂层内主要硬质相的衍射峰增强,半高宽变宽,表明硬质相的晶格完整性提高,晶粒细化.振动作用促使颗粒相均匀弥散分布于基体枝晶内和枝晶间.
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