Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment
The study focused on analysing the changes in dislocation density and elemental segregation at cellular substructures, as well as the transformation of nano-oxide inclusions at different post-treatment temperatures, and their impacts on the strengthening mechanisms of 316L processed by laser powder...
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sg-ntu-dr.10356-1817702024-12-17T02:51:39Z Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment Li, Wenqi Meng, Lixin Niu, Xiaofeng Zhou, Wei School of Mechanical and Aerospace Engineering Engineering Laser powder bed fusion 316L stainless steel The study focused on analysing the changes in dislocation density and elemental segregation at cellular substructures, as well as the transformation of nano-oxide inclusions at different post-treatment temperatures, and their impacts on the strengthening mechanisms of 316L processed by laser powder bed fusion (LPBF). Additionally, through quasi in-situ tensile experiments, the plastic deformation and fracture behaviours of LPBF 316L after annealing at 900 °C were studied, revealing the reasons behind its high ductility. The results indicated that with increasing annealing temperatures, the nano-oxide inclusions coarsened and their density decreased due to the Ostwald ripening mechanism. The coarsened oxide particles act as barriers to moving dislocations and grain boundaries, thereby prolonging the recovery and recrystallization processes. This resulted in cellular substructures exhibiting high thermal stability. Consequently, the ultimate tensile strength of LPBF 316L after annealing at 900 °C is 651 MPa, with a total elongation of 62.3%, surpassing other studies. Published version This work was supported by the National Natural Science Foundation of China (No. 52474418), and the Central Guiding Local Science and Technology Development Foundation (No. YDZJSX2022A012). 2024-12-17T02:51:38Z 2024-12-17T02:51:38Z 2024 Journal Article Li, W., Meng, L., Niu, X. & Zhou, W. (2024). Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment. Virtual and Physical Prototyping, 19(1), 2405623-. https://dx.doi.org/10.1080/17452759.2024.2405623 1745-2759 https://hdl.handle.net/10356/181770 10.1080/17452759.2024.2405623 2-s2.0-85204917595 1 19 2405623 en Virtual and Physical Prototyping © 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent. application/pdf |
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Engineering Laser powder bed fusion 316L stainless steel Li, Wenqi Meng, Lixin Niu, Xiaofeng Zhou, Wei Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment |
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The study focused on analysing the changes in dislocation density and elemental segregation at cellular substructures, as well as the transformation of nano-oxide inclusions at different post-treatment temperatures, and their impacts on the strengthening mechanisms of 316L processed by laser powder bed fusion (LPBF). Additionally, through quasi in-situ tensile experiments, the plastic deformation and fracture behaviours of LPBF 316L after annealing at 900 °C were studied, revealing the reasons behind its high ductility. The results indicated that with increasing annealing temperatures, the nano-oxide inclusions coarsened and their density decreased due to the Ostwald ripening mechanism. The coarsened oxide particles act as barriers to moving dislocations and grain boundaries, thereby prolonging the recovery and recrystallization processes. This resulted in cellular substructures exhibiting high thermal stability. Consequently, the ultimate tensile strength of LPBF 316L after annealing at 900 °C is 651 MPa, with a total elongation of 62.3%, surpassing other studies. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Li, Wenqi Meng, Lixin Niu, Xiaofeng Zhou, Wei |
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Article |
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Li, Wenqi Meng, Lixin Niu, Xiaofeng Zhou, Wei |
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Li, Wenqi |
title |
Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment |
title_short |
Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment |
title_full |
Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment |
title_fullStr |
Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment |
title_full_unstemmed |
Microstructure, mechanical properties, and deformation behaviour of LPBF 316L via post-heat treatment |
title_sort |
microstructure, mechanical properties, and deformation behaviour of lpbf 316l via post-heat treatment |
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2024 |
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https://hdl.handle.net/10356/181770 |
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1819112991893749760 |