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Surface integrity after post processing of EDM processed Inconel 718 shaft
RISE - Research Institutes of Sweden, Swerea, Swerea IVF. University West, Sweden.ORCID iD: 0000-0003-2991-2911
GKN Aerospace Sweden AB, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea IVF.ORCID iD: 0000-0003-3656-1806
University West, Sweden.
2018 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 95, no 5-8, p. 2325-2337Article in journal (Refereed) Published
Abstract [en]

Electrical discharge machining (EDM) is considered as an efficient alternative to conventional material removal concepts that allows for much higher material removal rates. However, EDM generates unwanted features such as re-cast layer (RCL), tensile residual stresses and a rough surface. In order to recover the surface integrity, different post processes has been compared: high-pressure water jet (HPWJ), grit blasting (GB) and shot peening (SP). Surface integrity has been evaluated regarding microstructure, residual stresses, chemical content and surface roughness. The results showed that a combination of two post processes is required in order to restore an EDM processed surface of discontinuous islands of RCL. HPWJ was superior for removing RCL closely followed by grit blasting. However, grit blasting showed embedded grit blasting abrasive into the surface. Regarding surface roughness, it was shown that both grit blasting and HPWJ caused a roughening of the surface topography while shot peening generates a comparably smoother surface. All three post processes showed compressive residual stresses in the surface where shot peening generated the highest amplitude and penetration depths. However, the microstructure close to the surface revealed that shot peening had generated cracks parallel to the surface. The results strongly state how important it is to evaluate the surface at each of the different subsequent process steps in order to avoid initiation of cracks. © 2017 The Author(s)

Place, publisher, year, edition, pages
2018. Vol. 95, no 5-8, p. 2325-2337
Keywords [en]
Abrasive water jet, EDM, Grit blasting, Inconel 718, Shot peening, Surface integrity, Abrasives, Blasting, Cracks, Electric discharge machining, Electric discharges, Jets, Microstructure, Residual stresses, Surface roughness, Surface topography, Compressive residual stress, Electrical discharge machining, High-pressure water jets, Inconel-718, Tensile residual stress, Fighter aircraft
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33155DOI: 10.1007/s00170-017-1342-6Scopus ID: 2-s2.0-85034646822OAI: oai:DiVA.org:ri-33155DiVA, id: diva2:1178028
Available from: 2018-01-26 Created: 2018-01-26 Last updated: 2018-08-16Bibliographically approved

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