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Microstructure evolution and mechanical response-based shortening of thermal post-treatment for electron beam melting (EBM) produced Alloy 718
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-5676-7903
Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, Modena (ITA).
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)
Quintus Technologies AB, Västerås (SWE).
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2021 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 820, article id 141515Article in journal (Refereed) Published
Abstract [en]

Electron beam melting (EBM) produced Alloy 718 was subjected to thermal post-treatment involving hot isostatic pressing (HIPing) and heat treatment (HT). Subjecting the material to HIPing at 1120 degrees C led to significant densification. Study of microstructure evolution during HT (comprising of solution treatment and aging) showed possibility of significantly shortening the HT duration, particularly the time for two-step aging from the standard (8 h + 8 h) long cycle to possibly a shortened (4 h + 1 h) cycle. Another approach for shortening the post-treatment cycle by integrating the HIPing with HT inside the HIP vessel was also successfully implemented. The above observations were further substantiated by tensile response of the material subjected to the varied post-treatment cycles; out of all the post-treatments steps, tensile behaviour was observed to be mainly affected by the aging treatment. Further prospects for shortening the post-treatment protocol are also described, such as shortening of HIPing duration for the typical 4 h to 1 h cycle as well as possible elimination of solution treatment step from the entire post-treatment protocol specifically when prior HIPing is performed. Heat treatment with prior HIPing was found to be crucial for improving fatigue life, because subjecting EBM Alloy 718 to only HT, irrespective of the short or standard long protocol, rendered inferior fatigue response.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 820, article id 141515
Keywords [en]
Additive manufacturing; Electron beam melting; Alloy 718; Post-treatment; Microstructure evolution; Mechanical properties
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-17272DOI: 10.1016/j.msea.2021.141515ISI: 000668740700001Scopus ID: 2-s2.0-85107286492OAI: oai:DiVA.org:hv-17272DiVA, id: diva2:1609722
Funder
Knowledge Foundation, 20160281Available from: 2021-11-09 Created: 2021-11-09 Last updated: 2022-04-04Bibliographically approved

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Goel, SnehaJoshi, Shrikant V.

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