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首页> 外文期刊>Journal of Materials Engineering and Performance >A Study on the Surface Composition and Migration of Materials and Their Effect on Surface Microhardness during Micro-EDM of Ti-6Al-4V
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A Study on the Surface Composition and Migration of Materials and Their Effect on Surface Microhardness during Micro-EDM of Ti-6Al-4V

机译：Ti-6Al-4V微埃姆二射流表面成分及材料迁移及其对表面显微硬度影响的研究

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摘要

This study aims to investigate the effect of machining parameters on the surface topography and composition of Ti-6Al-4V after micro-EDM as well as the effect of elemental composition on the surface microhardness. The surface topography has been studied in terms of quality of machined surface, crater sizes, and the presence of surface defects. Statistical analysis was carried out to study the influence of micro-EDM process parameters, i.e., voltage, capacitance, discharge energy, electrode rotational speed, and the electrode coating, on the elemental composition of the machined surface. It was found that the crater size, and hence the surface finish, was dependent on the electrical parameters only, with more pronounced effect of capacitance over voltage. The 60V and 30pF combination resulted in crater size as small as 1 mu m, whereas crater size of 12 mu m was obtained using a combination of 4700pF and 112V. Although smaller capacitance resulted in smaller crater sizes, it also increased the chances of defects or deposition of debris on the machined surface. There was migration of material from the tool electrode, dielectric oil, and atmosphere to the workpiece surface, which influenced the surface topography, crater sizes, and surface microhardness. The effects of non-electrical parameters on the relative percentage of various elements were found to be statistically insignificant. The surface microhardness was found to increase slightly due to the surface modification after EDM. The reason for increase in surface microhardness was identified as the migration of tungsten from the tool electrode and carbon from the dielectric. The maximum surface microhardness of 455HV was obtained at a surface composition after micro-EDM containing 7.96% C and 9.69% W, where non-machined Ti-6Al-4V surface does not have any carbon or tungsten on the surface.
机译：本研究旨在探讨加工参数对微EDM后Ti-6Al-4V的表面形貌和组成的影响，以及元素组合物对表面显微硬度的影响。已经在机械表面，火山口尺寸和表面缺陷的存在方面研究了表面形貌。进行统计分析，以研究机加工表面的元素组成上的微EDM工艺参数，即电压，电容，放电能量，电极转速和电极涂层的影响。发现火山口尺寸，因此表面光洁度仅取决于电气参数，具有更明显的电容对电压的影响。 60V和30PF组合导致火山口尺寸小至1μm，而使用4700pf和112V的组合获得12μm的火山口尺寸。虽然较小的电容导致火山口尺寸较小，但也增加了缺陷或碎屑在加工表面上的机会增加。从工具电极，介电油和大气中迁移材料到工件表面，这影响了表面形貌，火山口尺寸和表面微硬度。非电参数对各种元素相对百分比的影响是统计学上微不足道的。由于EDM后表面改性，发现表面显微硬度略微增加。将表面显微硬度增加的原因被鉴定为从刀具电极和碳的钨迁移到电介质。在含有7.96％C和9.69％W的微EDM之后，在表面组合物中获得455HV的最大表面显微硬度，其中非加工的Ti-6Al-4V表面在表面上没有任何碳或钨。

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