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Electron beam-powder bed fusion of Alloy 718: Effect of hot isostatic pressing and thermal spraying on microstructural characteristics and oxidation performance
University West, Department of Engineering Science.
Tarbiat Modares University, Department of Material Science and Engineering, Tehran, 141 15, Iran (IRN).
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-6610-1486
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
2020 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 404, article id 126626Article in journal (Refereed) Published
Abstract [en]

Alloy 718 manufactured via electron beam-powder bed fusion (EB-PBF) was coated with a thermally- sprayed NiCoCrAlY coating for enhanced oxidation protection. A high-velocity air fuel technique was used to deposit the coating. The specimens were then subjected to hot isostatic pressing (HIP). Oxidation of the specimens was undertaken in an ambient air environment at 650 and 800 °C for 168 h. The oxidation performance of EB-PBF-built Alloy 718 was improved after the deposition of the coating, particularly at 800 °C. In this temperature, a thick Cr-rich oxide scale was found on the uncoated Alloy 718 specimen, whereas a thin and stable Al-rich oxide scale was formed on the surface of the coated specimen. HIPing enhanced the oxidation resistance of uncoated Alloy 718; however, the oxidation behavior of coated Alloy 718 was negatively affected by HIPing. © 2020 The Authors

Place, publisher, year, edition, pages
2020. Vol. 404, article id 126626
Keywords [en]
Air; Aluminum alloys; Aluminum coatings; Aluminum oxide; Chromium alloys; Chromium compounds; Cobalt alloys; Electron beams; Oxidation; Oxidation resistance; Scale (deposits); Sintering; Thermal spraying, Ambient air; High velocity air fuels; Micro-structural characteristics; NiCoCrAlY coatings; Oxidation behaviors; Oxidation protection; Oxide scale; Powder bed, Hot isostatic pressing
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-16101DOI: 10.1016/j.surfcoat.2020.126626ISI: :000597889400063Scopus ID: 2-s2.0-85096582818OAI: oai:DiVA.org:hv-16101DiVA, id: diva2:1507947
Funder
Knowledge Foundation, 2018-0203
Note

Funders:Åforsk [18-296]

Available from: 2020-12-09 Created: 2020-12-09 Last updated: 2022-01-19Bibliographically approved

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Karimi Neghlani, PariaSadeghi, Esmaeil

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Alehojat, MobinKarimi Neghlani, PariaSadeghi, Esmaeil
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Department of Engineering ScienceDivision of Subtractive and Additive Manufacturing
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