Effect of electrical discharge machining process on crack susceptibility of nickel based heat resistant alloy

S. H. Kang, D. E. Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The objective of this study was to investigate the effects of electrical discharge machining (EDM) process conditions on the crack susceptibility of a nickel-based superalloy. Because sequential processes are inevitable in the manufacturing industry, the effects of EDM and post-EDM processes on the crack propagation behaviour of the components need to be clearly understood. The altered material zone (AMZ) of EDM processed Hastelloy X revealed different morphology before and after solution heat treatment. Depending on the EDM dielectric fluid and the post-EDM process such as solution heat treatment, it was found that cracks existing in the recast layer could propagate into substrate when a 20% strain tensile force was applied at room temperature. In the case of the kerosene electrical discharge (ED) machined specimens, it was observed that carburisation and sharp crack propagation along the grain boundary occurred after the heat treatment. However, the deionised water ED machined specimens after heat treatment underwent oxidation and showed no crack propagation behaviour. A metallurgical evaluation of the microstructure of the AMZ was also conducted.

Original languageEnglish
Pages (from-to)817-823
Number of pages7
JournalMaterials Science and Technology
Volume21
Issue number7
DOIs
Publication statusPublished - 2005 Jul 1

Fingerprint

Electric discharge machining
heat resistant alloys
Nickel
Superalloys
machining
cracks
nickel
Cracks
magnetic permeability
Heat treatment
Crack propagation
crack propagation
heat treatment
Deionized water
Tensile strain
Kerosene
Hastelloy (trademark)
kerosene
Grain boundaries
Oxidation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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Effect of electrical discharge machining process on crack susceptibility of nickel based heat resistant alloy. / Kang, S. H.; Kim, D. E.

In: Materials Science and Technology, Vol. 21, No. 7, 01.07.2005, p. 817-823.

Research output: Contribution to journalArticle

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