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Tailored ductility and strength for enhanced impact toughness of laser powder fusion built Alloy 718
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-3772-4371
Division of mechanical engineering, Vellore Institute of Technology, Vellore (IND).
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-8664-4573
Sandvik Additive Manufacturing, Sandviken (SWE).
2021 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 884, article id 161374Article in journal (Refereed) Published
Abstract [en]

Impact toughness of Alloy 718 built via laser powder bed fusion (LPBF) in as-built and thermally post treated conditions were investigated. The effect of various stages in the thermal post-treatment, including stress relief, hot isostatic pressing, solution treatment, and aging on the microstructure, texture, ductility, hardness, and impact toughness were studied. The greatest impact toughness was found in the as-built Alloy 718 material, associated with the high ductility of the material. The ductility results were also inversely related to the hardness of the investigated materials. Where the material with the highest ductility had the lowest hardness etc. Anisotropy in the impact toughness behavior was present in the as-built and post-heat treated specimens, which was explained by the presence of texture in all of the investigated material. With the applied heat treatments, recrystallization occurred and the preferential crystal orientations were randomized, decreasing the texture. The thermal post-treating conditions rendered different types of microstructures, with various grain sizes. The carbide content remained the same for the three investigated thermal post-treating conditions. 

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2021. Vol. 884, article id 161374
Keywords [en]
Impact toughness; Alloy 718; Laser powder bed fusion (LPBF); Heat treatment; Hot isostatic pressing (HIP)
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-17454DOI: 10.1016/j.jallcom.2021.161374ISI: 000687470700002Scopus ID: 2-s2.0-85111650906OAI: oai:DiVA.org:hv-17454DiVA, id: diva2:1604073
Funder
Knowledge Foundation, 20160281
Note

This project is a part of a larger project within the SUMAN-NEXT project (project number 20160281), which is finaced by the KK-foundation (Sweden), where several collaborators, such as Sandvik, GKN Aerospace Sweden AB, Quintus Technologies AB, Arcam-EBM, and Element are involved. The authors would therefore like to thank these project partners. The authors would also like to specifically thank Element (Karlskoga, Sweden) for performing the Charpy impact testing, Siemens Industrial Turbomachinery AB for specimen manufacturing, GKN Aerospace Sweden AB for performing the heat treatments, and Quintus for performing the HIP treatments. For his assistance, the authors would like to thank Dr. Esmaeil Sadeghi.

Available from: 2021-10-18 Created: 2021-10-18 Last updated: 2022-04-04

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Neikter, MagnusBalachandramurthi, Arun Ramanathan

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