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首页> 外文期刊>Proceedings of the institution of mechanical engineers >The surface integrity of ultra-fine grain steel, Electrical discharge machined using Iso-pulse and resistance- capacitance-type generator
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The surface integrity of ultra-fine grain steel, Electrical discharge machined using Iso-pulse and resistance- capacitance-type generator

机译：超细晶粒钢的表面完整性，使用等脉冲和电阻电容型发生器进行的放电加工

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摘要

Ultra-fine grained materials with high strength and low weight are eventually considered to be used in industries. To produce ultra-fine grained materials, equal channel angular pressing is a functional method, imposing severe plastic deformation on the workpiece. Electrical discharge machining is an indispensable process in manufacturing industrial parts with high accuracy and precision. However, electrical discharge machining has thermo-physical consequences, damaging the surface layers of the workpiece. On the other hand, the ultra-fine grained materials are thermodynamically unstable and tend to microstructural evolution. Thus, electrical discharge machining process affects the ultra-fine grained materials more than coarse grain materials. In this study, the effects of electrical discharge machining on the ultra-fine grained steel were investigated and the undesirable influences of the electrical discharge machining were diminished by adjusting the electrical discharge machining parameters. The ultra-fine grained steel samples were electrical discharge machined in two methods including Iso-pulse (roughing mode and finishing mode) and with resistance-capacitance-type generator. The surface integrity parameters, including thickness and microstructure of the recast layer and heat-affected zone, the cracks density and hardness, which for all three types of samples, were investigated by scanning electron microscopy, optical microscopy, X-ray diffraction technique, and micro-hardness tester. The results show that electrical discharge machining with resistance-capacitance-type generator has the minimum effects on the surface integrity of the ultra-fine grained samples because of the different material removal mechanism of resistance-capacitance-type electrical discharge machining.
机译：具有高强度和低重量的超细颗粒材料最终被认为是用于工业中。为了生产超细颗粒材料，等通道角挤压是一种功能性方法，会对工件造成严重的塑性变形。放电加工是高精度和高精度制造工业零件中必不可少的过程。但是，放电加工会产生热物理后果，从而损坏工件的表面层。另一方面，超细颗粒材料在热力学上是不稳定的，并且倾向于微结构演变。因此，放电加工过程对超细颗粒材料的影响要大于粗颗粒材料。在这项研究中，研究了电火花加工对超细晶粒钢的影响，并通过调整电火花加工参数减少了电火花加工的不良影响。用等脉冲（粗加工模式和精加工模式）和电阻电容式发生器两种方法对超细晶粒钢样品进行放电加工。通过扫描电子显微镜，光学显微镜，X射线衍射技术和扫描电镜研究了所有三种类型样品的表面完整性参数，包括重铸层和热影响区的厚度和微观结构，裂纹密度和硬度。显微硬度计。结果表明，由于电阻电容型放电加工的材料去除机理不同，使用电阻电容型发生器进行放电加工对超细颗粒样品的表面完整性影响最小。

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