摘要
采用预置粉式激光熔覆工艺在低碳钢表面制备了自熔性Co基合金涂层,利用光学显微镜、透射电镜(TEM)及X射线衍射仪分析了熔覆层的组织特征和相结构。结果表明:熔覆层由基体向表面可分为平面晶区、胞状晶区和树枝晶区;熔覆层主要以较发达的γ-Co枝晶为主,树枝晶间分布着层片状的共晶(γ-Co+Cr23C6)组织,由于热应力的作用,有孪晶组织出现。在其他工艺参数不变的情况下,随扫描速度的增大,枝晶组织明显细化。
Laser cladding coating with pre-painted Co-based alloy was prepared on low carbon steel surface.The microstructure and phase structure of the cladding layer were characterized using OM,SEM and XRD.The results show that γ-Co dendrite mainly exists in the coatings.γ-Co ＋ Cr23C6 eutectic exist among the dendrites.There are some crystallization morphologies in different zones,such as planar,cellar,columnar and twin microstructure.Under the same technologies,the dendrite microstructure is fined with the increase of scanning velocity.
出处
《热加工工艺》
CSCD
北大核心
2010年第16期123-126,共4页
Hot Working Technology
