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Exploring grinding and burnishing as surface post-treatment options for electron beam additive manufactured Alloy 718
VIT, School of Mechanical Engineering,Vellore, India (IND).
Anna University, Department of Manufacturing Engineering, College of Engineering, Chennai, India (IND).
VIT, School of Mechanical Engineering,Vellore, India (IND).
VIT, School of Mechanical Engineering,Vellore, India (IND).
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2020 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 397, article id 126063Article in journal (Refereed) Published
Abstract [en]

Numerous additive manufacturing (AM) techniques have been developed over the past decade. Features like immense freedom of intricate part design and shorter lead time make AM routes promising for a wide range of applications spanning aerospace, marine and automobile sectors. Among the various metal AM processes, Electron Beam Additive Manufacturing (EBAM) is being widely explored to realise the potential of Ni-based superalloys and Ti alloys for varied high-performance applications. A novel attempt has been made in this paper to assess the surface integrity of as-built EBAM nickel-based superalloy 718 (AB) subjected to grinding (G), Low Plasticity Burnishing (LPB) and their sequential combination. Apart from their influence on sub-surface microstructures, the effect of process variables during the above post-treatments on the residual stress profiles was also investigated. Results revealed that G + LPB results in about 0.6 ÎŒm lower surface roughness, 17% improved microhardness compared to AB + LPB, and higher compressive surface residual stress as compared to LPB processed EBAM samples. The sequential grinding and LPB - improved microhardness, was also found to extend about 500 ÎŒm more when compared to the LPB process. The G + LPB, which is greatly influenced by the prior grinding, smoothens the surface and thus results in a better surface finish. Highest hardness, superior surface finish, reduced porosity and improved compressive residual stress were observed in samples that adopted the AB + G + LPB sequence over other samples, with the LPB step at 40 MPa yielding the best results. © 2020 Elsevier B.V.

Place, publisher, year, edition, pages
2020. Vol. 397, article id 126063
Keywords [en]
3D printers; Additives; Automobile manufacture; Automotive industry; Burnishing; Electron beams; Grinding (machining); Marine applications; Microhardness; Nickel alloys; Residual stresses; Superalloys; Surface roughness; Titanium alloys, Compressive residual stress; High performance applications; Low plasticity burnishing; Nickel- based superalloys; Residual stress profiles; Sequential combination; Surface post-treatment; Surface residual stress, Surface treatment
National Category
Manufacturing, Surface and Joining Technology Other Materials Engineering
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-15739DOI: 10.1016/j.surfcoat.2020.126063ISI: 000543496400068Scopus ID: 2-s2.0-85086600858OAI: oai:DiVA.org:hv-15739DiVA, id: diva2:1460879
Note

Funders: Aeronautics Research and Development Board[ARDB/01/2031894/M/I]

Available from: 2020-08-25 Created: 2020-08-25 Last updated: 2021-04-27Bibliographically approved

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Joshi, Shrikant V.

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