激光熔覆TiC颗粒增强Ni-Cr-B-Si-C合金复合涂层的微观组织

来源期刊：中国有色金属学报1998年第3期

论文作者：李强 雷廷权 王富耻 欧阳家虎 杨德庄 周玉

文章页码：420 - 426

关键词：激光熔覆； TiC颗粒； Ni基合金； 复合涂层

Key words：laser cladding； TiCp particles； Ni based alloy； composite coating

摘    要：用连续波CO₂激光在45^#钢表面熔覆TiC+Ni-Cr-B-Si-C复合涂层。 微观组织分析表明： 在熔覆过程中， TiC颗粒表面发生部分溶解， 当凝固时， 重新外延生长出TiCr， 并固溶基体元素； 与纯合金涂层相比， 复合涂层中TiC颗粒的加入导致基体组织为条状CrB相间分布在Ni固溶体构成的羽毛状簇团组织， 并伴有少量的Ni枝晶间Ni+M₂₃C₆共晶。

Abstract: A continuous wave CO₂ laser was used to clad TiC +Ni-Cr-B-Si-C composite coating on AISI1045 steel substrate. The microstructure of the clad was invest igated. The results showed that TiC particles slightly dissolved within the matrix melt, and the dissolved TiC epitaxially recrystallized on the surface of the remaining TiC particles, in which alloying elements of the matrix were solid solved. As compared with the Ni-Cr-B-Si-C clad, the matrix produced a microstructure of CrB laths distributed in the Ni solid solution and a small amount of Ni + M₂₃C₆ eutectic between Ni dendrites after the TiC particles were added.