复合涂层的微观组织
(哈尔滨工业大学材料科学与工程学院， 哈尔滨 150001;
* 北京理工大学机械工程学院)
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。
关键字: 关键词: 激光熔覆 TiC颗粒 Ni基合金 复合涂层
（ School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China;
* Department of Mechanical Engineering, Beijing Institute of Technology, P. R. C hina）
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.
Key words: laser cladding TiCp particles Ni based alloy composite coating
