| 摘要: |
| 在45钢表面激光熔覆镍基WC合金涂层，分析扫描速度对熔覆层的成型、组织和性能的影响。采用金相显微镜、扫描电镜、显微硬度仪和摩擦磨损试验机对熔覆层的显微组织、化学成分、相组成以及耐磨耐蚀性进行分析测试。结果表明，熔覆层组织致密，与基体有良好的冶金结合。扫描速度增大，熔覆层出现裂纹的倾向增大，底部柱状晶外延生长层宽度减小，组织晶粒细化，相组成种类几乎没有变化，显微硬度增大，耐磨耐蚀性提高。当扫描速度为200 mm/min时得到成型性及耐磨耐蚀性优良的熔覆层。 |
| 关键词: 激光熔覆 镍基 WC合金 熔覆速度 |
| DOI：10.3969/j.issn.1007-9289.2014.04.013 |
| 分类号: |
| 基金项目: |
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| Effects of Scanning Speed on Microstructure and Properties of Laser Cladding Ni-based WC Alloy Coating |
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CUI Gang, HAN Bin, CUI Na, YU Mengfei
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College of Machanical and Electrial Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong
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| Abstract: |
| N-ibased WC alloy coating was prepared on the surface of 45 steel by laser cladding. The effects of scanning speed on the variation of formability, microstructure and properties of the cladding coating were analyzed. The phase composition, morphology, and wear and corrosion resistance of the cladding layers are investigated by metallurgical microscope, scanning electron microscopy (SEM), microhardness tester and friction and wear tester. The results show that the laser cladding coating performances dense tissue and good metallurgical bonding with the matrix. With increasing scanning speed, the cladding cracks increase and the grains present finer and denser. The width of the columnar crystal at the bottom of epitaxial layer is reduced gradually, while the phase composition of the cladding coating remains unchanged. The microhardness of the cladding coating increases, while the wear and corrosion resistance of the cladding coating are also improved. When the scanning speed is 200 mm/min, the cladding coating shows the best forming and good resistance. |
| Key words: laser cladding Nibased WC alloy cladding speed |
