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首页> 外文期刊>Applied Surface Science >Single-step laser deposition of functionally graded coating by dual 'wire-powder' or 'powder-powder' feeding-A comparative study
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Single-step laser deposition of functionally graded coating by dual 'wire-powder' or 'powder-powder' feeding-A comparative study

机译：通过双“粉末粉末”或“粉末粉末”进料单​​步激光沉积功能梯度涂层的比较研究

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The creation of iron-copper (Fe-Cu) alloys has practical application in improving the surface heat conduction and corrosion resistance of, for example, conformal cooling channels in steel moulds, but is difficult to achieve because the elements have got low inter-solubility and are prone to solidification cracking. Previous work by these authors has reported a method to produce a graded iron-nicket-copper coating in a single-step by direct diode laser deposition (DLD) of nickel wire and copper powder as a combined feedstock. This work investigates whether dual powder feeds can be used in that process to afford greater geometric flexibility and compares attributes of the 'nickel wire and copper powder' and 'nickel powder and copper powder' processes for deposition on a H13 tool steel substrate.rnIn wire-powder deposition, a higher temperature developed in the melt pool causing a clad with a smooth gradient structure. The nickel powder in powder-powder deposition did not impart much heat into the melt pool so the melt pool solidified with sharp composition boundaries due to single metal melting in some parts. In wire-powder experiments, a graded structure was obtained by varying the flow rates of wire and powder. However, a graded structure was not realised in powder-powder experiments by varying either the feed or the directions. Reasons for the differences and flow patterns in the melt pools and their effect on final part properties of parts produced are discussed.
机译：铁铜（Fe-Cu）合金的产生在提高钢模具中例如共形冷却通道的表面导热性和耐腐蚀性方面具有实际应用，但由于元素互溶性低而难以实现并且容易发生固化裂纹。这些作者的先前工作已报告了一种方法，该方法通过直接二极管激光沉积（DLD）镍线和铜粉作为组合原料，一步一步生产梯度铁镍铜涂层。这项工作研究了在该过程中是否可以使用双粉末进料以提供更大的几何灵活性，并比较了在H13工具钢基底上沉积的``镍丝和铜粉''和``镍粉和铜粉''工艺的属性。 -粉末沉积，在熔池中产生较高的温度，从而形成具有平滑梯度结构的包层。粉末粉末沉积中的镍粉不会向熔池中散发大量热量，因此由于某些部分中的单金属熔化，熔池以尖锐的成分边界凝固。在金属丝粉末实验中，通过改变金属丝和粉末的流速获得渐变结构。然而，通过改变进料或方向，在粉末粉末实验中未实现分级结构。讨论了熔池中差异和流动方式的原因及其对所生产零件最终零件性能的影响。

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