期刊
APPLIED SURFACE SCIENCE
卷 257, 期 14, 页码 5989-5997出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2011.01.083
关键词
Electrical discharge machining (EDM); Recast layer; Water-in-oil; Emulsion
类别
资金
- Chinese National Natural Science Foundation [50675225]
- Department of Science & Technology of Shandong Province [2006GG2204001]
Electrical discharge machining (EDM) caused a recast layer to form at the machined surface of the work-piece. The characteristics of the recast layer have a great relationship with the type of dielectric. The research work in this paper aims to acquire a profound knowledge of the recast layers of a surface machined by sinking EDM using water-in-oil (W/O) emulsion as dielectric. Scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrograph (EDS) and micro hardness analysis were performed. The characteristics of the recast layer formed in W/O emulsion were investigated by comparing them with those of the recast layer formed in kerosene and de-ionized water dielectric. It was found that the recast layer formed in W/O emulsion exhibited larger surface roughness, thickness and micro hardness compared with that formed in kerosene and de-ionized water. Both carbide and oxide were detected in the recast layer formed in W/O emulsion whereas only carbide was detected in the recast layer formed in kerosene. Due to the higher supersaturation of gases in the melted material, the recast layer formed in W/O emulsion was found to possess more micro-voids than that formed in kerosene and de-ionized water. (C) 2011 Elsevier B.V. All rights reserved.
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