Performance and Surface Integrity of Ti6Al4V After Sinking EDM with Special Graphite Electrodes

Performance and Surface Integrity of Ti6Al4V After Sinking EDM with Special Graphite Electrodes

Titanium and its alloys have high chemical reactivity with most of the cutting tools. This makes it difficult to work with these alloys using conventional machining processes. Electrical discharge machining (EDM) emerges as an alternative technique to machining these materials. In this work, it is i...

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Bibliographic Details
Published in:Journal of materials engineering and performance Vol. 23; no. 4; pp. 1480 - 1488
Main Authors: Amorim, Fred L., Stedile, Leandro J., Torres, Ricardo D., Soares, Paulo C., Henning Laurindo, Carlos A.
Format: Journal Article
Language:English
Published: Boston Springer US 01-04-2014
Springer
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Cutting
Engineering Design
Exact sciences and technology
Materials Science
Metals. Metallurgy
Production techniques
Quality Control
Reliability
Safety and Risk
Tribology
TiAl4V alloy
EDM performance
graphite electrodes
surface integrity
Titanium alloy
Particle size
Roughness
X ray diffraction
Microhardness
Electrical discharge machining
Wear
Performance
Chemical reactivity
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Summary:Titanium and its alloys have high chemical reactivity with most of the cutting tools. This makes it difficult to work with these alloys using conventional machining processes. Electrical discharge machining (EDM) emerges as an alternative technique to machining these materials. In this work, it is investigated the performance of three special grades of graphite as electrodes when ED-Machining Ti6Al4V samples under three different regimes. The main influences of electrical parameters are discussed for the samples material removal rate, volumetric relative wear and surface roughness. The samples surfaces were evaluated using SEM images, microhardness measurements, and x-ray diffraction. It was found that the best results for samples material removal rate, surface roughness, and volumetric relative wear were obtained for the graphite electrode with 10-μm particle size and negative polarity. For all samples machined by EDM and characterized by x-ray (XRD), it was identified the presence of titanium carbides. For the finish EDM regimes, the recast layer presents an increased amount of titanium carbides compared to semi-finish and rough regimes.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-013-0852-0