Finite Element Simulation and Experimental Investigation of Powder Mixed-EDM of Incoloy 825

Varughese, Roshin Thomas (2016) Finite Element Simulation and Experimental Investigation of Powder Mixed-EDM of Incoloy 825. MTech thesis.

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Abstract

The current study investigates the effects of graphite powder suspended in dielectric and various machining parameter on EDM characteristics like material removal rate, surface roughness, ROC, microhardness depth profile, white layer thickness, possible phase changes and residual stress of Incoloy825 (a nickel-basedsuper alloy), which is now a days used in chemical processing, nuclear fuel reprocessing and handling of radioactive wastes. The machining parameters varied during the experiment were peak current, pulse on time, and duty cycle and the design of experiments were done using response surface methodology (RSM). Also, temperature distribution, material removal rate, and residual stress were predicted through numerical modelling of PMEDM process. Results obtained shows a considerable increase in material removal rate and a significant reduction in surface roughness, white layer thickness, and surface cracks with PMEDM when compared to conventional EDM. The addition of powder results inthe formation of carbides and other alloy compounds on the machined surface which enhances the microhardness of surface and subsurface region. The added graphite powder also reduce the residual stress of the machined surface compared to conventional EDM

Item Type:Thesis (MTech)
Uncontrolled Keywords:Incoloy 825; PMEDM; Graphite powder; Numerical modelling; surface integrity; MRR; ROC; Microhardness; Residual stress
Subjects:Engineering and Technology > Mechanical Engineering > Production Engineering
Divisions: Engineering and Technology > Department of Mechanical Engineering
ID Code:9195
Deposited By:Mr. Sanat Kumar Behera
Deposited On:06 May 2018 10:02
Last Modified:06 May 2018 10:02
Supervisor(s):Gangopadhyay, Soumya

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