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Hot cracking in cast alloy 718
Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden.
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-9065-0741
2018 (English)In: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, p. 1-7Article in journal (Refereed) Epub ahead of print
Abstract [en]

Hot cracking susceptibility of the Fe–Ni-based precipitation hardening cast superalloy Alloy 718 was studied by Varestraint weldability testing. The effect of two hot isostatic pressing (HIP) treatments commonly employed in the aerospace industry was investigated in reference to the as cast condition. It was found that the heat affected zone (HAZ) liquation cracking susceptibility increased for samples with pre-weld HIP treatments. The as cast condition disclosed the best response for liquation cracking followed by HIP-1120 (1120°C/4h (HIP) + 1050°C/1h and furnace cooling to 650°C/1h in vacuum + 950°C/1h) and HIP-1190 (1190°C/4h (HIP) + 870°C/10h and furnace cooling to 650°C/1h in vacuum + 950°C/1h). The amount of the secondary precipitates and base metal grain size was found to be important parameters influencing the cracking susceptibility. Regarding solidification cracking susceptibility, the three conditions appear to behave similarly. © 2018 Institute of Materials, Minerals and Mining. Published by Taylor & Francis on behalf of the Institute.

Place, publisher, year, edition, pages
Taylor and Francis Ltd. , 2018. p. 1-7
Keyword [en]
Aerospace industry; Age hardening; Cracks; Electric arc welding; Heat affected zone; Precipitation (chemical); Sintering; Solidification; Vacuum furnaces, Alloy 718; Cracking susceptibility; Furnace cooling; Hot cracking; Liquation cracking; Secondary precipitates; Solidification cracking; Solidification cracking susceptibility, Hot isostatic pressing
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-12133DOI: 10.1080/13621718.2018.1429238Scopus ID: 2-s2.0-85041239440OAI: oai:DiVA.org:hv-12133DiVA, id: diva2:1184213
Note

Published online: 30 Jan 2018

Available from: 2018-02-20 Created: 2018-02-20 Last updated: 2018-02-21Bibliographically approved

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Andersson, Joel

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