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采用激光熔覆工艺在 2 0钢基体上获得了 2 0 4Co合金涂层。应用剥离法借助光镜、电镜、波谱仪及X射线衍射仪对基体表层及相关部位的组织及成分分布进行了分析研究。结果表明 :在本试验条件下 ,钢基表层的结晶机制为平面外延方式生长和胞状螺型位错方式生长 ;增加能量输入有利于向后一方向发展 ,并使热影响区组织粗化 ,甚至产生显微裂纹 ;尽管扩散层碳贫化 ,但其它合金元素的固溶和孪晶亚结构使之强化 ,而且钴、铬使之具有良好的耐蚀性。
A 204 Co alloy coating was obtained on a 20 steel substrate by laser cladding. The stripping method was used to analyze the microstructure and composition distribution of the surface and related parts of the substrate by means of light microscope, electron microscope, spectrometer and X-ray diffraction. The results show that under the experimental conditions, the crystal growth mechanism of the steel-based surface layer grows by plane epitaxial growth and dislocation-like dislocation; the increase of energy input is conducive to the development in the backward direction and roughen the heat-affected zone, Resulting in micro-cracks; although the diffusion layer carbon depletion, but the other alloying elements of the solution and twin sub-structure to strengthen it, and cobalt, chromium so that it has good corrosion resistance.