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Investigation of micro-hardness of H11 die steel using composite material electrodes in EDM

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Title Investigation of micro-hardness of H11 die steel using composite material electrodes in EDM
 
Creator Goyal, Parveen
Kumar, Rajesh
Kumar, Sanjeev
Singh, Bharat
 
Subject Electrical Discharge Machining (EDM)
Microhardness
Stir casting
Powder metallurgy
Composite material electrode
H11 die-steel
 
Description 312-322
Electrical Discharge Machining (EDM), a non-traditional material removal process has been well recognized for its
ability for precision machining of electrically conducting hard materials. Repetitive heating and cooling of the workpiece
surface during the machining make the surface hard. During this process, the transfer of material into workpiece surface due
to diffusion of material from the tool electrodes results in the desire surface modifications. This paper investigates the effect
of electric discharge machining on H11 die-steel materials with composite material electrodes fabricated by stir casting as
well as powder metallurgy process. Copper (85% by weight) has been used as matrix material with tungsten and carbon
nanotubes (10%-5% by weight). The performance of fabricated composite electrodes has also been compared with
conventional copper electrode. Microhardness achieved has been found to be best when H11 die-steel surface is
machined with composite electrodes fabricated by powder metallurgy process. Also, the microhardness has been enhanced
by 19.57% with optimal input parameters. Results show that optimum microhardness has been observed at high peak current
value when surface is machined with copper conventional electrode while pulse on time has been found to the major
contributor when surface is machined by composite material electrode. XRD analysis indicates the formation of tungstencarbide,
iron-carbide, chromium- nickel and copper on the machined surface of the workpiece.
 
Date 2022-07-06T09:33:24Z
2022-07-06T09:33:24Z
2022-06
 
Type Article
 
Identifier 0975-1017 (Online); 0971-4588 (Print)
http://nopr.niscpr.res.in/handle/123456789/60070
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJEMS Vol.29(3) [June 2022]