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), post-treatments 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 as-built 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.

post-treatment

electron beam melting

microstructure

hardness

hot isostatic pressing

additive manufacturing

defects

alloy 718

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 3 536

Styrkeområden

Produktion

Materialvetenskap

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

Annan materialteknik

Metallurgi och metalliska material

DOI

10.3390/ma13030536

PubMed

31979203

Mer information

Senast uppdaterat

2020-05-26