王永霞,陈林婷,冯明凤

• 1:蚌埠学院机械与车辆工程学院
• 2:安徽省增材制造工程研究中心
• 3:安徽煜宸激光技术有限公司

摘要(Abstract)：

为了提高价格低廉的45钢的零件在苛刻环境中的使用寿命，采用激光熔覆技术在其表面制备了不同TiC含量的TiC/Ni熔覆层，采用X射线衍射仪、光学显微镜、扫描电镜、显微硬度计和电化学工作站等分析了涂层的组织、硬度及耐蚀性。结果表明：Ni35熔覆层枝晶为富含Fe、Ni的γ-Ni固溶体，晶间为γ-Ni固溶体和富含B、C的M_(23)C_6、Cr_2B组成的共晶体，熔覆层从底层到上层依次为平面晶、胞状晶、柱状晶、柱状树枝晶、等轴晶和细等轴晶，枝晶中的Cr元素随着距熔覆层底部距离的增加出现富集。添加10%和20%TiC的熔覆层下层为粗大的柱状晶和柱状树枝晶，中层和上层为等轴晶，TiC以块状和四边形的形态分布于枝晶间。添加30%TiC的熔覆层分布有块状、杆状、粒状、鱼骨状和花瓣状的TiC,枝晶为细小的等轴晶。不同TiC含量的熔覆层硬度均呈现下层和上层硬度高，中层硬度低的现象。含10%TiC的熔覆层平均硬度最低，含30%TiC的平均硬度最高。未添加TiC的Ni35熔覆层腐蚀电流密度最小，钝化膜稳定性最好，耐蚀性最优，添加TiC后熔覆层的耐蚀性下降，但随着TiC含量的升高，熔覆层耐蚀性逐渐升高。

关键词(KeyWords)： TiC/Ni复合涂层;激光熔覆;显微硬度;耐蚀性

Abstract:

Keywords:

基金项目(Foundation): 安徽省教育厅高校科研项目(2022AH051922);; 安徽省质量工程项目(2021jyxm0927)

作者(Author): 王永霞,陈林婷,冯明凤

DOI: 10.13289/j.issn.1009-6264.2023-0504

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