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Effect of solution heat treatments on superalloys: Part 1 – alloy 718
University West, Department of Engineering Science, Division of Manufacturing Processes. Department of Materials Technology at Volvo Aero Corporation, Trollhättan, and Chalmers University of Technology, Gothenburg, Sweden. (PTW)ORCID iD: 0000-0001-9065-0741
Department of Materials Technology at Volvo Aero Corporation, Trollhättan, and Chalmers University of Technology, Gothenburg, Sweden.
Department of Microscopy and Microanalysis at Chalmers University of Technology, 41296 Gothenburg, Sweden.
Department of Mechanical and Industrial Engineering, University of Manitoba, Winnipeg, Manitoba, R3T 5V6 Canada.
2012 (English)In: Materials Science and Technology, ISSN 0267-0836, Vol. 28, no 5, 609-619 p.Article in journal (Refereed) Published
Abstract [en]

The hot ductility as measured by Gleeble testing of Alloy 718 at four different solution heat treatments (954°C/15 h, 954°C/1 h, 982°C/1 h and 1050°C/3 h+954°C/1 h) has been investigated. It is concluded that constitutional liquation of NbC assisted by δ phase takes place and deteriorates the ductility. Parameters established by analysing the ductility dependence on temperature indicate a reduced weldability of the material in the coarse grain size state (ASTM 3) while indicating an increased weldability when containing a large amount of δ phase due to a grain boundary pinning effect. The accumulation of trace elements during grain growth at the highest temperature is believed to be the cause for the observed reduced on-cooling ductility.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2012. Vol. 28, no 5, 609-619 p.
Keyword [en]
Hot ductility, Gleeble test, Alloy 718
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-9007DOI: 10.1179/1743284711Y.0000000101OAI: oai:DiVA.org:hv-9007DiVA: diva2:900803
Available from: 2016-02-05 Created: 2016-02-05 Last updated: 2016-02-10Bibliographically approved

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