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Surface integrity after post processing of EDM processed Inconel 718 shaft
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Manufacturing Swerea IVF AB Mölndal Sweden.ORCID iD: 0000-0003-2991-2911
GKN Aerospace Sweden AB Trollhättan Sweden.
Manufacturing Swerea IVF AB Mölndal Sweden.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
2017 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, 1-13 p.Article in journal (Refereed) Epub ahead of print
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.

Place, publisher, year, edition, pages
2017. 1-13 p.
Keyword [en]
Surface integrity Inconel 718 Shot peening Abrasive water jet Grit blasting EDM
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-11894DOI: 10.1007/s00170-017-1342-6Scopus ID: 2-s2.0-85034646822OAI: oai:DiVA.org:hv-11894DiVA: diva2:1163586
Note

First Online: 22 November 2017

Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2017-12-19Bibliographically approved

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Holmberg, JonasBeno, Tomas

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