Tailored ductility and strength for enhanced impact toughness of laser powder fusion built Alloy 718

Tailored ductility and strength for enhanced impact toughness of laser powder fusion built Alloy 718

Impact toughness of Alloy 718 built via laser powder bed fusion (LPBF) in as-built and thermally post-treated conditions were investigated. The effect of various stages in the thermal post-treatment, including stress relief, hot isostatic pressing, solution treatment, and aging on the microstructure...

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Bibliographic Details
Published in:Journal of alloys and compounds Vol. 884; p. 161374
Main Authors: Neikter, M., Raja, D.C., Balachandramurthi, A.R., Harlin, P.
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 05-12-2021
Elsevier BV
Subjects:
Alloy 718
Anisotropy
Crystal structure
Ductility
Grain size
Hardness
Heat treating
Heat treatment
Hot isostatic pressing
Hot isostatic pressing (HIP)
Impact strength
Impact toughness
Laser powder bed fusion (LPBF)
Microstructure
Nickel base alloys
Powder beds
Production Technology
Produktionsteknik
Recrystallization
Solution heat treatment
Superalloys
Texture
Toughness
Hot isostatic pressing (HIP)
Heat treatment
Impact toughness
Alloy 718
Laser powder bed fusion (LPBF)
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Summary:Impact toughness of Alloy 718 built via laser powder bed fusion (LPBF) in as-built and thermally post-treated conditions were investigated. The effect of various stages in the thermal post-treatment, including stress relief, hot isostatic pressing, solution treatment, and aging on the microstructure, texture, ductility, hardness, and impact toughness were studied. The greatest impact toughness was found in the as-built Alloy 718 material, associated with the high ductility of the material. The ductility results were also inversely related to the hardness of the investigated materials. Where the material with the highest ductility had the lowest hardness etc. Anisotropy in the impact toughness behavior was present in the as-built and post-heat treated specimens, which was explained by the presence of texture in all of the investigated material. With the applied heat treatments, recrystallization occurred and the preferential crystal orientations were randomized, decreasing the texture. The thermal post-treating conditions rendered different types of microstructures, with various grain sizes. The carbide content remained the same for the three investigated thermal post-treating conditions. •As-built material had higher impact toughness strength compared to the post-treated materials.•The Impact toughness result correlated well with the area reduction of the samples.•Anisotropic impact toughness was observed, which was attributed to the presence of texture.
ISSN:0925-8388
1873-4669
1873-4669
DOI:10.1016/j.jallcom.2021.161374