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Microstructure, solidification texture, and thermal stability of 316 L stainless steel manufactured by laser powder bed fusion
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0002-9441-2502
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0003-1711-5595
Bloemfontein Cent Univ Technol South Africa.
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2018 (English)In: Metals, ISSN 2075-4701, Vol. 8, no 8, p. 1-18, article id 643Article in journal (Refereed) Published
Abstract [en]

This article overviews the scientific results of the microstructural features observed in 316 L stainless steel manufactured by the laser powder bed fusion (LPBF) method obtained by the authors, and discusses the results with respect to the recently published literature. Microscopic features of the LPBF microstructure, i.e., epitaxial nucleation, cellular structure, microsegregation, porosity, competitive colony growth, and solidification texture, were experimentally studied by scanning and transmission electron microscopy, diffraction methods, and atom probe tomography. The influence of laser power and laser scanning speed on the microstructure was discussed in the perspective of governing the microstructure by controlling the process parameters. It was shown that the three-dimensional (3D) zig-zag solidification texture observed in the LPBF 316 L was related to the laser scanning strategy. The thermal stability of the microstructure was investigated under isothermal annealing conditions. It was shown that the cells formed at solidification started to disappear at about 800 °C, and that this process leads to a substantial decrease in hardness. Colony boundaries, nevertheless, were quite stable, and no significant grain growth was observed after heat treatment at 1050 °C. The observed experimental results are discussed with respect to the fundamental knowledge of the solidification processes, and compared with the existing literature data.

Place, publisher, year, edition, pages
MDPI AG , 2018. Vol. 8, no 8, p. 1-18, article id 643
Keywords [en]
316 L stainless steel, Cellular solidification, Electron microscopy, Laser powder bed fusion, Solidification texture, Thermal stability of microstructure
National Category
Materials Engineering
Research subject
Materials Engineering
Identifiers
URN: urn:nbn:se:kau:diva-69224DOI: 10.3390/met8080643ISI: 000443616400079Scopus ID: 2-s2.0-85052594962OAI: oai:DiVA.org:kau-69224DiVA, id: diva2:1248354
Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2020-01-10Bibliographically approved

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Krakhmalev, PavelFredriksson, GunnelSvensson, Krister

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