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Surface integrity and fatigue of non-conventional machined Alloy 718
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-2991-2911
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(English)Manuscript (preprint) (Other academic)
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-12190OAI: oai:DiVA.org:hv-12190DiVA, id: diva2:1187098
Available from: 2018-03-02 Created: 2018-03-02 Last updated: 2018-03-02Bibliographically approved
In thesis
1. Surface integrity on post processed alloy 718 after nonconventional machining
Open this publication in new window or tab >>Surface integrity on post processed alloy 718 after nonconventional machining
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

There is a strong industrial driving force to find alternative production technologies in order to make the production of aero engine components of superalloys even more efficient than it is today. Introducing new and nonconventional machining technologies allows taking a giant leap to increase the material removal rate and thereby drastically increase the productivity. However, the end result is to meet the requirements set for today's machined surfaces.The present work has been dedicated to improving the knowledge of how the non-conventional machining methods Abrasive Water Jet Machining, AWJM, Laser Beam Machining, LBM, and Electrical Discharge Machining, EDM, affect the surface integrity. The aim has been to understand how the surface integrity could be altered to an acceptable level. The results of this work have shown that both EDM and AWJM are two possible candidates but EDM is the better alternative; mainly due to the method's ability to machine complex geometries. It has further been shown that both methods require post processing in order to clean the surface and to improve the topography and for the case of EDM ageneration of compressive residual stresses are also needed.Three cold working post processes have been evaluated in order to attain this: shot peening, grit blasting and high pressure water jet cleaning, HPWJC. There sults showed that a combination of two post processes is required in order to reach the specified level of surface integrity in terms of cleaning and generating compressive residual stresses and low surface roughness. The method of high pressure water jet cleaning was the most effective method for removing the EDM wire residuals, and shot peening generated the highest compressive residual stresses as well as improved the surface topography.To summarise: the most promising production flow alternative using nonconventional machining would be EDM followed by post processing using HPWJC and shot peening.

Place, publisher, year, edition, pages
Trollhättan: University West, 2018. p. 92
Series
Licentiate Thesis: University West ; 20
Keywords
Alloy 718, Non-conventional machining, post processing, surface integrity, Microstructure, Residual stress, Electron back scattering diffraction, Material removal rate
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-12191 (URN)978-91-87531-72-9 (ISBN)978-91-87531-71-2 (ISBN)
Presentation
2018-03-07, C120, Högskolan Väst, Trollhättan, 10:15 (English)
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Supervisors
Available from: 2018-03-07 Created: 2018-03-02

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Holmberg, Jonas

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