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Open AccessArticle

Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718

1
Department of Engineering Science, University West, 461 32 Trollhättan, Sweden
2
Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 881; https://doi.org/10.3390/met9080881
Received: 28 June 2019 / Revised: 2 August 2019 / Accepted: 3 August 2019 / Published: 10 August 2019
(This article belongs to the Special Issue Welding Metallurgy and Weldability of Superalloys)
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. View Full-Text
Keywords: selective laser melting; Alloy 718; heat treatments; gas tungsten arc welding; heat affected zone cracking selective laser melting; Alloy 718; heat treatments; gas tungsten arc welding; heat affected zone cracking
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MDPI and ACS Style

Raza, T.; Hurtig, K.; Asala, G.; Andersson, J.; Svensson, L.-E.; Ojo, O.A. Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718. Metals 2019, 9, 881.

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