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The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

机译:激光束加工前后ESD涂层的形态和力学性能

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摘要

Electro-spark deposition (ESD) and laser beam machining (LBM) are the technologies using the concentrated energy flux. This paper deals with the issue of the impact of laser modification on the morphology and mechanical properties of carbide/copper coatings produced by electro-spark treatment. The coatings were applied to C45 carbon steel samples using the EIL-8A device. The following three types of electrodes made using the powder metallurgy (PM) hot pressing technique, from copper and tungsten carbide powders of different percentage compositions, were used for the coatings: 25% WC and 75% Cu; 50% WC and 50% Cu; and 75% WC and 25% Cu. Laser modification of the surface layers was performed with an Nd:YAG laser. The research focused on the analysis of the morphology of coatings applied by electro-spark technology before and after laser processing. The analysis of the morphology of electro-spark coatings revealed that the coatings had microcracks and pores. The laser beam machining of ESD coatings led to the homogenization of chemical composition, fragmentation of the structure, and elimination of microcracks. In addition, measurements of porosity, microhardness, adhesion, and analysis of XRD phase composition of the electro-spark coatings were performed. Laser processing proved to have a positive effect on improving the adhesion of coatings and reducing their porosity. This paper also presents a simulation model of heat transfer processes for the case of laser radiation impact on a WC-Cu coating. The developed numerical model, describing the influence of laser treatment on the distribution of temperature fields in the heated material (at a given depth) is of significant importance in the development of treatment technologies. Laser-modified ESD coatings perform anti-wear and protective functions, which enable their potential application in means of transport such as rolling stock.
机译:电火花沉积(ESD)和激光束加工(LBM)是使用浓缩能量通量的技术。本文涉及激光改性对电火花处理产生的碳化物/铜涂层形态和力学性能的影响。使用EIL-8A器件将涂层施加到C45碳钢样品上。使用不同百分比组合物的铜和碳化钨粉末制成的以下三种类型的电极,来自不同百分比组合物的铜和碳化钨粉末,用于涂层:25%Wc和75%Cu; 50%wc和50%cu;和75%WC和25%Cu。用Nd:YAG激光进行表面层的激光改性。该研究侧重于激光加工前后电火花技术涂层形态的分析。对电火花涂层形态的分析显示涂层具有微裂纹和孔隙。 ESD涂层的激光束加工导致化学成分的均质化,结构的破碎化和消除微裂纹。另外,进行孔隙率,微硬度,粘附性和XRD相组成的XRD相组合物的测量。激光加工证明对改善涂层的粘附并降低孔隙率具有积极影响。本文还提出了对WC-Cu涂层激光辐射撞击的情况的传热过程的仿真模型。所开发的数值模型,描述激光处理对加热材料中温度场(在给定深度)的影响的影响,在治疗技术的发展方面具有重要意义。激光改性的ESD涂层执行抗磨损和保护功能,使其潜在应用于轧制库存等运输工具。

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