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Advanced microstructural characterisation of cast ATI 718 Plus-effect of homogenisation heat treatments on secondary phases and repair welding behaviour
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden. (PTW)ORCID iD: 0000-0002-1607-9177
University of Manitoba, Department of Mechanical Engineering, Winnipeg, Canada; Manitoba Institute for Materials, University of Manitoba, Winnipeg, Canada .
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-9065-0741
University of Manitoba, Department of Mechanical Engineering, Winnipeg, Canada.
2020 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 64, no 3, p. 523-533Article in journal (Refereed) Epub ahead of print
Abstract [en]

The influence of base metal conditions on the weld cracking behaviour of cast ATI 718Plus® is investigated by comparing 4 h and 24 h dwell time pseudo-hip homogenisation heat treatments at 1120, 1160 and 1190 °C with the as-cast microstructure. Scanning electron microscopy (SEM), X-ray diffraction (XRD) on electrolytically extracted powder and transmission electron microscopy (TEM) were used to identify Nb-rich secondary phases in interdendritic areas as the C14 Laves phase and Nb(Ti) MC-type carbides. All homogenisation heat treatments but the 1120 °C 4-h condition dissolve the Laves phase. A repair welding operation was simulated by linear groove multi-pass manual gas tungsten arc welding (GTAW). The Laves phase containing microstructures resulted in lower total crack length for heat affected zone cracking. Constitutional liquation of Nb(Ti) MC-type carbides is observed as a liquation mechanism in Laves-free microstructure, while thick liquid film formation due to the Laves eutectic melting could reduce the formation of weld cracks in microstructures containing the Laves phase.

Place, publisher, year, edition, pages
2020. Vol. 64, no 3, p. 523-533
Keywords [en]
Carbides; Cladding (coating); Crack initiation; Gas metal arc welding; Gas welding; Heat affected zone; Heat treatment; High resolution transmission electron microscopy; Liquid films; Microstructure; Nickel alloys; Repair; Scanning electron microscopy; Weldability, As cast microstructure; Constitutional liquation; Formation of weld; Gas tungsten arc welding; GTA welding; Heat affected zone crackings; Interdendritic areas; Microstructural characterisation, Thallium alloys
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14997DOI: 10.1007/s40194-020-00851-0ISI: 000519395500010Scopus ID: 2-s2.0-85078321984OAI: oai:DiVA.org:hv-14997DiVA, id: diva2:1395628
Funder
Swedish Energy AgencyAvailable from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-04-02Bibliographically approved

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Hanning, FabianAndersson, Joel

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