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Effect of post-treatments under hot isostatic pressure on microstructural characteristics of EBM-built Alloy 718
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).ORCID-id: 0000-0001-5676-7903
University of Idaho, Department of Chemical and Materials Engineering, Moscow, ID 83844, United States.
University of Idaho, Department of Chemical and Materials Engineering, Moscow, ID 83844, United States.
Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Additive Manufacturing, ISSN 2214-8604, Vol. 28, s. 727-737Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Electron beam melting (EBM) has emerged as an important additive manufacturing technique. In this study, Alloy 718 produced by EBM was investigated in as-built and post-treated conditions for microstructural characteristics and hardness. The post-treatments investigated were hot isostatic pressing (HIP) and combined HIP + heat treatment (HIP + HT) carried out as a single cycle inside the HIP vessel. Both the post-treatments resulted in significant decrease in defects inevitably present in the as-built material. The columnar grain structure of the as-built material was found to be maintained after post-treatment, with some sporadic localized grain coarsening noted. Although HIP led to complete dissolution of δ and γ′′ phase, stable NbC and TiN (occasionally present) particles were observed in the post-treated specimens. Significant precipitation of γ′′ phase was observed after HIP + HT, which was attributed to the two-step aging heat treatment carried out during HIP + HT. The presence of γ′′ phase or otherwise was correlated to the hardness of the material. While the HIP treatment resulted in drop in hardness, HIP + HT led to 'recovery' of the hardness to values exceeding those exhibited by the as-built material. © 2019 Elsevier B.V.

sted, utgiver, år, opplag, sider
2019. Vol. 28, s. 727-737
Emneord [en]
3D printers; Additives; Coarsening; Electron beam melting; Electron beams; Hardness; Heat treatment; Hot isostatic pressing; Sintering; Titanium nitride, Alloy 718; Columnar grain structure; Complete dissolution; Grain coarsening; Hot isostatic pressure; Manufacturing techniques; Micro-structural characteristics; Post treatment, Niobium compounds
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-14457DOI: 10.1016/j.addma.2019.06.002Scopus ID: 2-s2.0-85067846675OAI: oai:DiVA.org:hv-14457DiVA, id: diva2:1356850
Forskningsfinansiär
Knowledge Foundation, 20160281Tilgjengelig fra: 2019-10-02 Laget: 2019-10-02 Sist oppdatert: 2019-11-01bibliografisk kontrollert

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