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Influence of Hot Isostatic Pressing on the Hot Ductility of Cast Alloy 718: The Effect of Niobium and Minor Elements on the Liquation Mechanism
Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, 412 96, 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
2020 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 51, no 12, p. 6248-6257Article in journal (Refereed) Published
Abstract [en]

The influence of two hot isostatic pressing (HIP) treatments on liquation behavior was investigated and compared with regard to the extent of heat-affected zone liquation cracking in cast Alloy 718. The extent of liquation was seen to increase after HIP treatment at 1190 °C due to solute changes caused by the homogenization of Nb, which contributed to extensive grain boundary melting. The HIP treatment at 1120 °C exhibited lower liquation with contributions from particle liquation of the Laves phase and constitutional liquation of NbC carbides. This was also reflected in a lower ductility recovery temperature, with slower recovery for the former due to the extensive liquation. Interestingly, the nil ductility temperatures were both below the predicted equilibrium solidus of the alloy, which suggests that the ductility drop is related to liquation caused by solute segregation at the grain boundaries. © 2020, The Author(s).

Place, publisher, year, edition, pages
Springer , 2020. Vol. 51, no 12, p. 6248-6257
Keywords [en]
Carbides; Ductility; Grain boundaries; Heat affected zone; Niobium; Niobium compounds; Sintering, Constitutional liquation; Effect of niobium; Grain-boundary melting; Liquation cracking; Minor elements; Nbc carbides; Recovery temperature; Solute segregation, Hot isostatic pressing
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-15971DOI: 10.1007/s11661-020-06004-8ISI: 000572037500001Scopus ID: 2-s2.0-85091359903OAI: oai:DiVA.org:hv-15971DiVA, id: diva2:1474375
Funder
European Regional Development Fund (ERDF)Available from: 2020-10-08 Created: 2020-10-08 Last updated: 2021-02-10Bibliographically approved

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Hanning, FabianAndersson, Joel

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