Surface modification of SKD 61 during EDM with metal powder in the dielectric

Biing Hwa Yan, Yan Cherng Lin, Fuang Yuan Huang, Chen Hung Wang

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


This study investigates the influence of process parameters of electrical discharge machining (EDM) on machining performances with the addition of Al and Cr powder into kerosene. In addition, the effects of powder addition on surface fine-finish and modification are also discussed. The machining process parameters of this empirical investigation included peak current, pulse duration, as well as the type of powder added, its grain size, and mixing ratio. The machining performance, characterized by material removal rate (MRR), electrode wear rate (EWR) and surface roughness, was monitored as a function of process variables. Moreover, surface modifications were also explored thoroughly. The experimental results demonstrate that addition of Al and Cr powders into the dielectric enlarges the gap distance and divides discharge current, which promotes better EDM performance. Restated, adding a mixture of Al and Cr powders into dielectric yields the best results. Moreover, during EDM, the added powder migrates and penetrates the machined surface. Test results reveal that the corrosion resistance and surface hardness was improved by adding the proper powder into dielectric.

Original languageEnglish
Pages (from-to)2597-2604
Number of pages8
JournalMaterials Transactions
Issue number12
StatePublished - Dec 2001


  • Dielectric
  • Electric discharge machining (EDM)
  • Material removal rate (MRR)
  • Powder-suspended working fluid
  • Surface modification
  • Surface roughness


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