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Laser beam powder bed fusion and post processing of alloy 247LC
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-9065-0741
University of Manitoba, Winnipeg, Canada.
Siemens Industrial Turbomachinery AB, Finspang, Sweden .
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2019 (English)In: MS and T 2019 - Materials Science and Technology, Materials Science and Technology , 2019, p. 27-34Conference paper, Published paper (Refereed)
Abstract [en]

Alloy 247LC is sensitive to cracking during laser beam powder bed fusion (PBF-LB) manufacturing. Post processing is thus required to close cracks and achieve desired properties. In this study, samples of Alloy 247LC were manufactured by PBF-LB and subsequently post processed by hot isostatic pressing (HIP), HIP + solution and ageing heat treatments. The microstructure was characterized. Results showed cracks in the as-built condition. Cracks were not detected after HIP. Bright microconstituents were observed in the region between the cells, mainly, because of the partitioning of Hf and Ta into the intercellular region, where they presumably form carbides. What is assumed to be oxides were prominent in the microstructure. Thermodynamic calculations showed rapid formation of ?’ precipitates in the alloy, due to the high total concentration of Al and Ta and this was linked to the high hardness values in the as-built condition. © 2019 MS&T19®

Place, publisher, year, edition, pages
Materials Science and Technology , 2019. p. 27-34
Keywords [en]
Carbides; Cracks; Hot isostatic pressing; Microstructure; Tantalum, High hardness; Intercellular regions; Micro-constituents; Phases; Post processing; Powder bed; Thermodynamic calculations, Laser beams
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14914DOI: 10.7449/2019/MST_2019_27_34Scopus ID: s2.0-85075366814ISBN: 9780873397704 (electronic)OAI: oai:DiVA.org:hv-14914DiVA, id: diva2:1389164
Conference
Materials Science and Technology 2019, MS and T 2019; Oregon Convention CenterPortland; United States; 29 September 2019 through 3 October 2019
Available from: 2020-01-29 Created: 2020-01-29 Last updated: 2020-01-29Bibliographically approved

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Adegoke, OlutayoAndersson, Joel

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