Can Appropriate Thermal Post-Treatment Make Defect Content in as-Built Electron Beam Additively Manufactured Alloy 718 Irrelevant?
Artikel i vetenskaplig tidskrift, 2020

Electron beam melting (EBM) is gaining rapid popularity for production of complex
customized parts. For strategic applications involving materials like superalloys (e.g., Alloy 718), posttreatments
including hot isostatic pressing (HIPing) to eliminate defects, and solutionizing and aging
to achieve the desired phase constitution are often practiced. The present study specifically explores
the ability of the combination of the above post-treatments to render the as-built defect content in EBM
Alloy 718 irrelevant. Results show that HIPing can reduce defect content from as high as 17% in asbuilt
samples (intentionally generated employing increased processing speeds in this illustrative
proof-of-concept study) to <0.3%, with the small amount of remnant defects being mainly associated
with oxide inclusions. The subsequent solution and aging treatments are also found to yield virtually
identical phase distribution and hardness values in samples with vastly varying as-built defect
contents. This can have considerable implications in contributing to minimizing elaborate process
optimization efforts as well as slightly enhancing production speeds to promote industrialization of
EBM for applications that demand the above post-treatments.

electron beam melting

microstructure

defects

additive manufacturing

post-treatment

hardness

alloy 718

hot isostatic pressing

Författare

Sneha Goel

Högskolan Väst

Kévin Bourreau

University of Limoges

Jonas Olsson

Uta Klement

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Shrikant Joshi

Högskolan Väst

Materials

1996-1944 (ISSN)

Vol. 13 536-

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Bearbetnings-, yt- och fogningsteknik

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Metallurgi och metalliska material

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2020-02-12