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Dynamic recrystallization during hot compression of Ni-based superalloy Haynes 282
Chalmers University of Technology, Göteborg (SWE).
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (KAMPT)ORCID iD: 0000-0002-1607-9177
University West, Department of Engineering Science, Division of Welding Technology. (KAMPT)ORCID iD: 0000-0001-9065-0741
Chalmers University of Technology, Göteborg (SWE).
2023 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 960, p. 170837-170837, article id 170837Article in journal (Refereed) Epub ahead of print
Abstract [en]

Understanding the microstructural behaviour of materials during thermomechanical processing is a vital step towards optimizing the mechanical properties. One important aspect during forming processes, such as forging, is dynamic recrystallization (DRX), which sets the starting microstructure for the subsequent manufacturing steps. Here we investigated the DRX behaviour of Ni-base superalloy Haynes 282 during hot compression with a strain rate of 0.05 s−1 at 1080 °C, with care taken to minimize the effects of meta-dynamic recrystallization (mDRX) and adiabatic heating. Small DRX grains could be observed already at ε = 0.1, i.e. before the peak strain εp = 0.15. The DRX process accelerated significantly above ε = 0.2, and the material was fully recrystallized at ε = 1.5. Up to ε = 0.8 DRX occurred through continuous nucleation of new grains, whereas above ε = 0.8 the number density of DRX grains decreased and the increase in recrystallized fraction was due to growth of existing grains. Contrary to common assumptions of DRX nuclei being essentially dislocation free, many of the DRX grains contained pronounced dislocation substructures, even at small strains where they are not expected to have undergone deformation.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 960, p. 170837-170837, article id 170837
Keywords [en]
Ni-base superalloys, Dynamic recrystallization, Hot deformation, EBSD
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-20148DOI: 10.1016/j.jallcom.2023.170837ISI: 001027734500001Scopus ID: s2.0-S0925838823021400OAI: oai:DiVA.org:hv-20148DiVA, id: diva2:1771815
Note

CC BY-NC-ND 4.0

The funding for the present work has been provided by the Swedish Agency for Innovation (VINNOVA), through the Swedish National Aeronautical Research Program (NFFP) grant no. 2017-04863, in collaboration with GKN Aerospace Engine Systems AB. 

Available from: 2023-06-21 Created: 2023-06-21 Last updated: 2024-01-05Bibliographically approved

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Hanning, FabianAndersson, Joel

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