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Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0002-4598-4790
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0002-0234-3168
University of Manitoba, Department of Mechanical Engineering, Winnipeg, MB R3T 5V6, Canada.
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0001-9065-0741
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2019 (English)In: Metals, Vol. 9, no 8, article id 881Article in journal (Refereed) Published
Abstract [en]

The weldability of additive manufactured Alloy 718 was investigated in various heat-treated conditions. The microstructure of the base metal was examined in detail in order to understand the effect of different pre-weld heat treatments; i.e., solution, solution and aging, and hot isostatic pressing. After welding, the variation in total crack lengths, maximum crack length and the total number of cracks in the heat affected zone (HAZ) were used as criteria for the cracking susceptibility of each material condition where wrought Alloy 718 was used as the reference material. Selective laser melting (SLM) manufactured Alloy 718 was susceptible to HAZ cracking in all material conditions. Total crack lengths in HAZ were highest in the SLM as-built condition and lowest in the SLM hot isostatic pressed condition. The cracks that were found in the HAZ of the welded materials consisted of liquation cracks, with eutectic product surrounding the cracks, as well as cracks from which liquation products were absent.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 8, article id 881
Keywords [en]
selective laser melting; Alloy 718; heat treatments; gas tungsten arc welding; heat affected zone cracking
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14595DOI: 10.3390/met9080881ISI: 000484510000071Scopus ID: 2-s2.0-85073280907OAI: oai:DiVA.org:hv-14595DiVA, id: diva2:1361525
Available from: 2019-10-16 Created: 2019-10-16 Last updated: 2019-11-13

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Raza, TahiraHurtig, KjellAndersson, JoelSvensson, Lars-Erik

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