Effect of recast layer on the low cycle fatigue life of electric discharge machined inconel 718

M. Anthony Xavior, N. Ranganathan, Ashwath Pazhani

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


The effect of the recast layer formed during electric discharge machining of Inconel 718 on the fatigue life at room temperature was investigated. Data were generated in the uniaxial tension low cycle fatigue (LCF) mode at ambient temperature using flat 5 mm thick tensile specimen prepared as per ASTM E08. Taguchi's L9 orthogonal array is used to derive the experimentation outcomes for 4 different parameters with three levels. The parameters varied are peak discharge current (Ip), current pulse duration (Ton), gap voltage (V) and pulse off time (Toff). Thus machined samples were subjected to fatigue at a selected stress, and the resulting fatigue lives were compared with that of the parent end milled material. The surfaces of the fatigued specimens were examined under optical and scanning electron microscopes, and the roughness of the surfaces was measured using a standard profilometer. Analysis of the results obtained was correlated with the machining parameters and the surface quality obtained from the spark EDM process and the thickness of the recast layer formed during the process. The results obtained from micro hardness measurements, profilometry, optical and scanning microscopy were illustrated.

Original languageEnglish
Pages (from-to)12666-12672
Number of pages7
JournalMaterials Today: Proceedings
Issue number5
Publication statusPublished - 12 Jun 2018
Externally publishedYes
Event2018 International Conference on Materials Manufacturing and Modelling, ICMMM 2017 - Vellore, India
Duration: 9 Mar 201711 Mar 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd. All rights reserved.


  • Aluminium alloys
  • Ceramic reinforcements
  • Heat treatment
  • Tensile strength

ASJC Scopus subject areas

  • Materials Science(all)


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