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Influence of laser powder bed fusion process parameters on the microstructure of solution heat-treated nickel-based superalloy Alloy 247LC
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
Linköpings universitet, Linköping.ORCID iD: 0000-0001-7117-9480
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0001-9065-0741
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2022 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 183, article id 111612Article in journal (Refereed) Published
Abstract [en]

In this study, Alloy 247LC samples were built with different laser powder bed fusion (L-PBF) process parameters. The samples were then subjected to solution heat treatment at 1260 °C for 2 h. The grain size of all the samples increased significantly after the heat treatment. The relationship between the process parameters and grain size of the samples was investigated by performing a design of experiment analysis. The results indicated that the laser power was the most significant process parameter that influenced the grain height and aspect ratio. The laser power also significantly influenced the grain width. The as-built and as-built + heat-treated samples with high, medium, and low energy densities were characterized using a field emission gun scanning electron microscope equipped with an electron backscatter diffraction detector. The micrographs revealed that the cells present in the as-built samples disappeared after the heat treatment. Isolated cases of twinning were observed in the grains of the as-built + heat-treated samples. The disappearance of cells, increase in the grain size, and appearance of twins suggested that recrystallization occurred in the alloy after the heat treatment. The occurrence of recrystallization was confirmed by analyzing the grain orientation spread of the alloy, which was lower and more predominantly <1° in the as-built + heat-treated conditions than in the as-built conditions. The microhardness of the as-built + heat-treated samples were high which was plausible because γ’ precipitates were observed in the samples. However, the L-PBF process parameters had a very low correlation with the microhardness of the as-built + heat-treated samples.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 183, article id 111612
Keywords [en]
Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-17873DOI: 10.1016/j.matchar.2021.111612ISI: 000729283300002Scopus ID: 2-s2.0-85120334650OAI: oai:DiVA.org:hv-17873DiVA, id: diva2:1615517
Available from: 2021-11-30 Created: 2021-11-30 Last updated: 2022-04-04Bibliographically approved
In thesis
1. Processability of Laser Powder Bed Fusion of Alloy 247LC-Influence of process parameters on microstructure and defects
Open this publication in new window or tab >>Processability of Laser Powder Bed Fusion of Alloy 247LC-Influence of process parameters on microstructure and defects
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is about laser powder bed fusion (L-PBF) of the nickel-basedsuperalloy Alloy 247LC. Alloy 247LC is mainly used in gas turbine blades and processing the blades with L-PBF may confer performance advantage over the blades manufactured with conventional methods. This is mainly because L-PBFis more suitable, than conventional methods, for manufacturing the complex cooling holes in the blades. The research was motivated by the need for academia and industry to gain knowledge about the processability of the alloy using L-PBF. The knowledge is essential to eventually solve the problem of cracking encountered when processing the alloy. In addition, dense parts with low void content should be processed and the microstructure and properties should meett he required performance. Heat-treatment is usually performed to acquire final properties, so it is also of interest to study this aspect. Thus, the thesis answered some of the important questions related to process parameter-microstructure- property relationships.

Abstract [sv]

Populärvetenskaplig sammanfattning

Denna avhandling handlar om laserpulverbäddsmältning (L-PBF) av legeringen247LC. Legering 247LC används i gasturbinblad och tillverkningen av bladen medL-PBF ger fördelar i förhållande till bladen tillverkade med konventionella metoder. Detta beror huvudsakligen på att L-PBF är mer lämpad än konventionella metoder för att tillverka de komplexa geometrier som krävs förbladen. Forskningen var motiverad utifrån behovet hos akademi och industri att få kunskap om legeringens processbarhet gällande L-PBF. Kunskapen är nödvändig för att kunna lösa problemet med sprickbildning, vilket är ett stort problem vid tillverkningen av legeringen. Avhandlingen besvarade några av de viktiga frågorna relaterade till förhållandet mellan processparametrar och mikrostruktur.

Place, publisher, year, edition, pages
Trollhättan: University West, 2021. p. 134
Series
PhD Thesis: University West ; 45
Keywords
Laser powder bed fusion, Alloy 247LC, additive manufacturing, nickel-based superalloys, processability, cracks, voids, Laserpulverbäddssmältning, legering 247LC, additiv tillverkning, superlegeringar, processbarhet, sprickor, porositet.
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
urn:nbn:se:hv:diva-17799 (URN)978-91-89325-05-0 (ISBN)978-91-89325-06-7 (ISBN)
Public defence
2021-12-16, F131 + zoom, Gustava Melins gata 2, Trollhättan, 13:00 (English)
Opponent
Supervisors
Funder
VinnovaKnowledge Foundation
Note

Till avhandlingen hör en inskickad artikel (paper D) , som inte visas  nu.

Available from: 2021-11-22 Created: 2021-11-18 Last updated: 2022-01-19Bibliographically approved

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Adegoke, OlutayoAndersson, JoelPederson, RobertHarlin, Peter

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