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Microstructure, solidification texture, and thermal stability of 316 L stainless steel manufactured by laser powder bed fusion
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).ORCID-id: 0000-0002-9441-2502
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).ORCID-id: 0000-0003-1711-5595
Bloemfontein Cent Univ Technol South Africa.
Vise andre og tillknytning
2018 (engelsk)Inngår i: Metals, ISSN 2075-4701, Vol. 8, nr 8, s. 1-18, artikkel-id 643Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
MDPI AG , 2018. Vol. 8, nr 8, s. 1-18, artikkel-id 643
Emneord [en]
316 L stainless steel, Cellular solidification, Electron microscopy, Laser powder bed fusion, Solidification texture, Thermal stability of microstructure
HSV kategori
Forskningsprogram
Materialteknik
Identifikatorer
URN: urn:nbn:se:kau:diva-69224DOI: 10.3390/met8080643ISI: 000443616400079Scopus ID: 2-s2.0-85052594962OAI: oai:DiVA.org:kau-69224DiVA, id: diva2:1248354
Tilgjengelig fra: 2018-09-14 Laget: 2018-09-14 Sist oppdatert: 2020-01-10bibliografisk kontrollert

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