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首页> 外文期刊>Materials and Manufacturing Processes >A Comparative Research of Damaged Layers Formed in Surface Grinding and Wire-Electrodischarge Machining
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A Comparative Research of Damaged Layers Formed in Surface Grinding and Wire-Electrodischarge Machining

机译：表面磨削和电火花加工中形成的损伤层的比较研究

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摘要

Compared to surface grinding, wire-electrodischarge machining (WEDM) is competitive because WEDM allows the machining of any type of conductive material, regardless of its hardness. Nevertheless, WEDM is not preferred for final machining due to the existence of the process-induced damaged layers. In this study, the damaged layers formed in hardened AISI 52100 steel by surface grinding and WEDM are researched and compared. It is found that the damaged layers for both grinding and WEDM are composed of the white layer and dark layer, and the white layer possesses a highly refined grain structure compared to the bulk material. The retained austenite content of the ground white layer is lower than that of the unmachined material, while WEDM white layer has much high retained austenite volume fraction. The microhardness of the ground white layer is higher than that of the WEDM one. High residual tensile stresses are observed in the ground surface, and slight compressive stresses are observed just below the surface. WEDM generates residual tensile stresses in the surface. It is also found that mechanical deformation plays an important role in ground damaged layers compared to WEDM ones, where thermal effects are more dominant.
机译：与表面研磨相比，线放电加工（WEDM）具有竞争力，因为WEDM允许加工任何类型的导电材料，而不论其硬度如何。但是，由于存在加工引起的损坏层，因此WEDM在最终加工中不是优选的。在这项研究中，研究和比较了通过表面研磨和电火花线切割在硬化的AISI 52100钢中形成的损坏层。发现用于磨削和电火花加工的损坏层由白色层和深色层组成，并且与散装材料相比，白色层具有高度精细的晶粒结构。磨碎的白色层的残余奥氏体含量低于未加工材料的残余奥氏体含量，而WEDM白层的残余奥氏体体积分数高得多。磨白层的显微硬度高于WEDM的显微硬度。在地面上观察到了较高的残余拉伸应力，而在地面下方则观察到了轻微的压缩应力。 WEDM在表面产生残余拉伸应力。还发现，与WEDM相比，机械变形在地面受损层中起着重要作用，在WEDM层中，热效应更为明显。

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