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Revealing Relationships between Microstructure and Hardening Nature of Additively Manufactured 316L Stainless Steel
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Inst of Metal Research, Chinese Academy of Sciences, Shenyang, China and School of Materials Science and Eng, University of Science and Technology of China, Hefei, China.ORCID iD: 0000-0002-0123-1164
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
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2021 (English)In: Materials & Design, ISSN 0261-3069, Vol. 198, article id 109385Article in journal (Refereed) Published
Abstract [en]

Relationships between microstructures and hardening nature of laser powder bed fused (L-PBF) 316 L stainless steel have been studied. Using integrated experimental efforts and calculations, the evolution of microstructure entities such as dislocation density, organization, cellular structure and recrystallization behaviors were characterized as a function of heat treatments. Furthermore, the evolution of dislocation-type, namely the geometrically necessary dislocations (GNDs) and statistically stored dislocations (SSDs), and their impacts on the hardness variation during annealing treatments for L-PBF alloy were experimentally investigated. The GND and SSD densities were statistically measured utilizing the Hough-based EBSD method and Taylor's hardening model. With the progress of recovery, the GNDs migrate from cellular walls to more energetically-favourable regions, resulting in the higher concentration of GNDs along subgrain boundaries. The SSD density decreases faster than the GND density during heat treatments, because the SSD density is more sensitive to the release of thermal distortions formed in printing. In all annealing conditions, the dislocations contribute to more than 50% of the hardness, and over 85.8% of the total dislocations are GNDs, while changes of other strengthening mechanism contributions are negligible, which draws a conclusion that the hardness of the present L-PBF alloy is governed predominantly by GNDs.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 198, article id 109385
Keywords [en]
Laser powder bed fusion; 316L stainless steel; Dislocation-type; Hardening nature; Microstructural evolution
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-171912DOI: 10.1016/j.matdes.2020.109385ISI: 000699974700012Scopus ID: 2-s2.0-85097346061OAI: oai:DiVA.org:liu-171912DiVA, id: diva2:1509832
Note

Funding: Swedish Governmental Agency for Innovation Systems (Vinnova)Vinnova [2016-05175]; Science Foundation Ireland (SFI)Science Foundation Ireland [16/RC/3872]; Center for Additive Manufacturing-metal (CAM2); European Regional Development FundEuropean Commission

Available from: 2020-12-14 Created: 2020-12-14 Last updated: 2023-12-28Bibliographically approved

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Cui, LuqingXu, JinghaoPeng, Ru LinMoverare, Johan

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