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Influence of homogenisation treatments on the hot ductility of cast ATI® 718Plus®: Effect of niobium and minor elements on liquation characteristics
Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, SE-41296, Sweden.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-1607-9177
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-9065-0741
2021 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 799, article id 140151Article in journal (Refereed) Published
Abstract [en]

homogenisation heat treatments. The hot ductility deteriorated significantly after long-dwell homogenisation heat treatments for 24 h at temperatures of 1120 and 1190 °C as compared with those treated at a short dwell time of 4 h at the same temperatures. The observed ductility deterioration was related to more extensive liquation along the grain boundaries caused by different mechanisms, e.g., liquation by solute segregation mechanism, Laves melting, constitutional liquation of MC carbides and supersolidus grain boundary melting, with the effect and extent depending on the solute changes after the homogenisation heat treatments. Furthermore, the role of Nb as the solute element and as the precipitate former, as well as the effect of minor alloying elements segregating along the grain boundaries, is discussed in connection to grain boundary liquation, which contributes to a better understanding of heat-affected zone liquation cracking susceptibility of cast ATI® 718Plus®. © 2020 The Authors

Place, publisher, year, edition, pages
2021. Vol. 799, article id 140151
Keywords [en]
Alloying elements; Carbides; Deterioration; Grain boundaries; Heat affected zone; Heat treatment; Melting; Niobium, Boundary liquation; Constitutional liquation; Different mechanisms; Effect of niobium; Grain-boundary melting; Liquation cracking; Solute segregation; Thermomechanical simulator, Ductility
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-15809DOI: 10.1016/j.msea.2020.140151ISI: 000587907300001Scopus ID: 2-s2.0-85090044280OAI: oai:DiVA.org:hv-15809DiVA, id: diva2:1466896
Funder
European Regional Development Fund (ERDF)Available from: 2020-09-14 Created: 2020-09-14 Last updated: 2022-03-30Bibliographically approved

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Hanning, FabianAndersson, Joel

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