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首页> 外文期刊>Applied Surface Science >Comparative study of microstructural characteristics of electrospark and Nd:YAG laser epitaxially growing coatings
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Comparative study of microstructural characteristics of electrospark and Nd:YAG laser epitaxially growing coatings

机译：电火花与Nd：YAG激光外延生长涂层的微观结构特征比较研究

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摘要

As low-heat input welding processes, electrospark deposition and pulsed Nd: YAG laser cladding can be commonly used to prepare epitaxially growing coatings. However, these two processes have quite different characteristics in the energy input, the amount of materials involved, and the temperature gradient, and hence might result in dissimilar microstructural characteristics. In this paper, a comparative study has been made between microstructural characteristics in epitaxial growth coatings prepared by electrospark deposition and pulsed Nd:YAG laser cladding. Some interesting results have been achieved. Firstly, epitaxial growth coatings can be commonly achieved by these two techniques. Secondly, microstructural morphologies of these two epitaxial growth coatings are obviously different, cellular columnar structure prevails in the electrospark coating while columnar dendritic structure occupies most of the laser coating thickness, more importantly, electrospark coating remains fully columnar in the whole layer whereas laser coating tends to change from columnar to equiaxed at the top of the layer. Thirdly, electrospark coating possesses finer and more homogeneous microstructure than laser coating.
机译：作为低热量输入的焊接工艺，电火花沉积和脉冲Nd：YAG激光熔覆通常可用于制备外延生长的涂层。但是，这两个过程在能量输入，所涉及的材料数量和温度梯度方面具有完全不同的特性，因此可能导致不同的微观结构特性。本文对通过电火花沉积和脉冲Nd：YAG激光熔覆制备的外延生长涂层的微观结构特征进行了比较研究。已经取得了一些有趣的结果。首先，通常可以通过这两种技术获得外延生长涂层。其次，这两种外延生长涂层的微观结构形态是明显不同的，电火花涂层占主导地位的是蜂窝状柱状结构，而柱状树枝状结构占据了激光涂层的大部分厚度，更重要的是，电火花涂层在整个层中仍保持全柱状，而激光涂层倾向于在层的顶部从柱状变为等轴。第三，电火花涂层比激光涂层具有更细，更均匀的微观结构。

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