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Solute trapping and non-equilibrium Jun Li 2023.pdf (6.41 MB)

Solute trapping and non-equilibrium microstructure during rapid solidification of additive manufacturing

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posted on 2024-02-20, 16:14 authored by N Ren, J Li, R Zhang, C Panwisawas, M Xia, H Dong, Jianguo Li

Solute transport during rapid and repeated thermal cycle in additive manufacturing (AM) leading to non-equilibrium, non-uniform microstructure remains to be studied. Here, a fully-coupled fluid dynamics and microstructure modelling is developed to rationalise the dynamic solute transport process and elemental segregation in AM, and to gain better understanding of non-equilibrium nature of intercellular solute segregation and cellular structures at sub-grain scale during the melting-solidification of the laser powder bed fusion process. It reveals the solute transport induced by melt convection dilutes the partitioned solute at the solidification front and promotes solute trapping, and elucidates the mechanisms of the subsequent microstructural morphology transitions to ultra-fine cells and then to coarse cells. These suggest solute trapping effect could be made used for reducing crack susceptibility by accelerating the solidification process. The rapid solidification characteristics exhibit promising potential of additive manufacturing for hard-to-print superalloys and aid in alloy design for better printability.

Funding

National Natural Science Foundation of China No. 52074182 (J.L.), Natural Science Foundation of Shanghai No. 22ZR1430700 (J.L.), and Startup Fund for Young Faculty at SJTU (N.R.)

From Industry 3.0 to Industry 4.0: Additive Manufacturability

Engineering and Physical Sciences Research Council

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History

Author affiliation

School of Engineering, University of Leicester

Version

  • VoR (Version of Record)

Published in

Nature Communications

Volume

14

Issue

1

Pagination

7990

Publisher

Springer Science and Business Media LLC

issn

2041-1723

eissn

2041-1723

Copyright date

2023

Available date

2024-02-20

Spatial coverage

England

Language

eng

Deposited by

Professor Hong Dong

Deposit date

2024-02-02

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