Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 513-14, Issue -, Pages 208-215Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.01.061
Keywords
Wire-EDM; Recast layer; Nickel-base superalloy; Inconel 718
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Funding
- Sandia National Laboratory
- UT-Battelle, LLC [DEAC05-00OR22725]
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Inconel 718 is a high nickel content superalloy possessing high strength at elevated temperatures and resistance to oxidation and corrosion. The non-traditional manufacturing process of wire-electrical discharge machining (EDM) possesses many advantages over traditional machining during the manufacture of Inconel 718 parts. However, certain detrimental effects are also present and are due in large part to the formation of the recast layer. An experimental investigation was conducted to determine the main EDM parameters which contribute to recast layer formation in Inconel 718. It was found that average recast layer thickness increased primarily with energy per spark, peak discharge current, and current pulse duration. Over the range of parameters tested, the recast layer was observed to be between 5 and 9 mu m in average thickness, although highly variable in nature. The recast material was found to possess in-plane tensile residual stresses, as well as lower hardness and elastic modulus than the bulk material. (c) 2009 Elsevier B.V. All rights reserved.
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