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Microstructure and mechanical behavior of as-built and heat-treated Hastelloy-X alloy produced by Laser Powder Bed Fusion process
Dalarna University, School of Information and Engineering, Materials Technology.ORCID iD: 0000-0001-7938-9909
2022 (English)In: Procedia CIRP, Elsevier B.V. , 2022, Vol. 111, p. 373-376Conference paper, Published paper (Refereed)
Abstract [en]

In this study,microstructure and mechanical characterization of as-built Hastelloy X (HX) samples produced by laser powder bed fusion (LPBF) process and post-heat-treated samples were investigated. Two sets of samples, horizontal and vertical to build direction, were considered in as-built condition to understand the effect of build direction and two solution heat-treatment temperatures, 1177°C and 1220°C, followed by fast cooling were considered to study the effect of solution heat-treatment temperature on microstructure and mechanical properties. Microstructure characterization of as-built sample horizontal to build direction revealed a typical multi-layer molten pool boundaries and the sample vertical to build direction revealed multi-layered and multi-tracked molten pool boundaries. Electron backscatter diffraction results reveal a disrupted epitaxial grain growth for the as-built samples vertical to build direction whereas equiaxed grain structure with varying twin grain boundary fractions was observed for heat-treated HX samples. As-built LPBF HX samples exhibit higher mean hardness and yield strength than post-heat-treated samples. Higher elongation and lower yield strength were observed for the sample solution treated at 1220°C as compared to the sample solution annealed at 1177°C. Microstructural evolution at 20% engineering strain for the exact positions before the tensile test was presented for solution treated at 1220°C samples, which reveals distinct slip lines within each grain as well as increased dislocation density at grain boundaries. © 2022 The Authors. Published by Elsevier B.V.

Place, publisher, year, edition, pages
Elsevier B.V. , 2022. Vol. 111, p. 373-376
Keywords [en]
Grain boundaries, Grain growth, Heat treatment, Metal testing, Tensile testing, Textures, Twinning, Build direction, Fusion process, Hastelloy X, In-situ micro tensile testing, Laser powder bed fusion, Laser powders, Micro tensile testing, Microstructure characterization, Powder bed, Solution heat treatment, Yield stress, Hastelloy-X, Laser powder bed fusion (L-PBF), Mechanical Properties
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:du-43353DOI: 10.1016/j.procir.2022.08.169Scopus ID: 2-s2.0-85141895493OAI: oai:DiVA.org:du-43353DiVA, id: diva2:1713827
Conference
12th CIRP Conference on Photonic Technologies [LANE 2022], 4-8 September 2022, Fürth, Germany
Available from: 2022-11-28 Created: 2022-11-28 Last updated: 2023-03-17Bibliographically approved

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Surreddi, Kumar Babu

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CiteExportLink to record
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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • asciidoc
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