Electrical Discharge Machining Performance of Deep Cryogenically Treated Inconel 825 Superalloy: Emphasis on Surface Integrity

  • Rahul
  • Saurav DattaEmail author


Electrical discharge machining performance of deep cryogenically treated Inconel 825 superalloy was assessed and compared to that of normal workpiece. Machining performance was evaluated in purview of surface integrity which articulated studies on morphology and topography of the EDMed surface. Severity of surface cracking was found relatively less on the machined specimen of cryogenically treated workpiece (CTW) while comparing non-treated workpiece. Moreover, machined specimen of CTW exhibited formation of tiny white layer. Other topographical measures including material migration, surface residual stress, and micro-indentation hardness of the machined specimen were analyzed. Effects of cryogenic treatment of the workpiece followed by EDM operation were discussed emphasizing on metallurgical aspects of the machined surface. Moreover, effects of cooling rate set for the cryogenic treatment cycle were also investigated on influencing EDM performance of CTW.


Electrical discharge machining Deep cryogenically treated Inconel 825 Surface cracking White layer Material migration Surface residual stress Micro-indentation hardness 


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© ASM International 2019

Authors and Affiliations

  1. 1.School of Mechanical SciencesKalinga Institute of Industrial TechnologyBhubaneswarIndia
  2. 2.Department of Mechanical EngineeringNational Institute of TechnologyRourkelaIndia

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