On the melt pool flow and interface shape of dissimilar alloys via selective laser melting
A simulation model is established to describe the micron-scale flow of dissimilar alloys between IN625 and 316 L. The accuracy of the model has been verified through experiments. It is found that the Marangoni force and the recoil pressure are 6.28 and 58.51 times the surface tension, respectively....
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sg-ntu-dr.10356-1693402023-07-15T16:48:10Z On the melt pool flow and interface shape of dissimilar alloys via selective laser melting Yao, Liming Xiao, Zhongmin Ramesh, Aditya Zhang, Yanmei School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Additive Manufacturing Melt Pool A simulation model is established to describe the micron-scale flow of dissimilar alloys between IN625 and 316 L. The accuracy of the model has been verified through experiments. It is found that the Marangoni force and the recoil pressure are 6.28 and 58.51 times the surface tension, respectively. Marangoni force, recoil pressure, and surface tension are the key factors influencing the melt-pool convection and shape. When the laser power is increased, the recoil pressure forms a deep keyhole which leads to a rapid increase in the melt-pool depth. The interlayer interface is changed from a weakly staggered shape to a regularly and remarkably staggered and overlapping shape. The specific surface area growth rate (SAR) is increased by as much as 10 times. The Marangoni force, inertial force and surface tension dominate the single-track surface hump formation. When the depth and width of the melt pool are small and the length is large, the inertial force of the melt is significant, and irregular humps are formed on the single-track surface. The formed humps and the SAR substantially increase the bonding strength between the two dissimilar alloys. Agency for Science, Technology and Research (A*STAR) Submitted/Accepted version Funding for this work was provided by A *STAR SERC AME Programmatic Fund for the “Structural Metal Alloys Programme” (A18B1b0061) and Singapore Centre for 3D Printing under the project “Acquisition and reconstruction of 3D CAD models for repair and reengineering” (001163-00010), and State Key Laboratory of Robotics and Systems (HIT) [SKLRS-2023-KF-24]. 2023-07-13T06:13:22Z 2023-07-13T06:13:22Z 2023 Journal Article Yao, L., Xiao, Z., Ramesh, A. & Zhang, Y. (2023). On the melt pool flow and interface shape of dissimilar alloys via selective laser melting. International Communications in Heat and Mass Transfer, 145(Part A), 106833-. https://dx.doi.org/10.1016/j.icheatmasstransfer.2023.106833 0735-1933 https://hdl.handle.net/10356/169340 10.1016/j.icheatmasstransfer.2023.106833 2-s2.0-85156091311 Part A 145 106833 en A18B1b0061 001163-00010 International Communications in Heat and Mass Transfer © 2023 Elsevier Ltd. All rights reserved.This paper was published in International Communications in Heat and Mass Transfer and is made available with permission of Elsevier Ltd. application/pdf |
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Engineering::Mechanical engineering Additive Manufacturing Melt Pool Yao, Liming Xiao, Zhongmin Ramesh, Aditya Zhang, Yanmei On the melt pool flow and interface shape of dissimilar alloys via selective laser melting |
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A simulation model is established to describe the micron-scale flow of dissimilar alloys between IN625 and 316 L. The accuracy of the model has been verified through experiments. It is found that the Marangoni force and the recoil pressure are 6.28 and 58.51 times the surface tension, respectively. Marangoni force, recoil pressure, and surface tension are the key factors influencing the melt-pool convection and shape. When the laser power is increased, the recoil pressure forms a deep keyhole which leads to a rapid increase in the melt-pool depth. The interlayer interface is changed from a weakly staggered shape to a regularly and remarkably staggered and overlapping shape. The specific surface area growth rate (SAR) is increased by as much as 10 times. The Marangoni force, inertial force and surface tension dominate the single-track surface hump formation. When the depth and width of the melt pool are small and the length is large, the inertial force of the melt is significant, and irregular humps are formed on the single-track surface. The formed humps and the SAR substantially increase the bonding strength between the two dissimilar alloys. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Yao, Liming Xiao, Zhongmin Ramesh, Aditya Zhang, Yanmei |
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Article |
author |
Yao, Liming Xiao, Zhongmin Ramesh, Aditya Zhang, Yanmei |
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Yao, Liming |
title |
On the melt pool flow and interface shape of dissimilar alloys via selective laser melting |
title_short |
On the melt pool flow and interface shape of dissimilar alloys via selective laser melting |
title_full |
On the melt pool flow and interface shape of dissimilar alloys via selective laser melting |
title_fullStr |
On the melt pool flow and interface shape of dissimilar alloys via selective laser melting |
title_full_unstemmed |
On the melt pool flow and interface shape of dissimilar alloys via selective laser melting |
title_sort |
on the melt pool flow and interface shape of dissimilar alloys via selective laser melting |
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2023 |
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https://hdl.handle.net/10356/169340 |
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