Journal
MANUFACTURING LETTERS
Volume 27, Issue -, Pages 13-17Publisher
ELSEVIER
DOI: 10.1016/j.mfglet.2020.12.002
Keywords
Additive manufacturing; Selective laser melting; Density; Process parameters; Dimensionless number; Universal scaling law
Funding
- Discovery to Product through the grant Draper Technology Innovation Fund
- UW2020 WARF Discovery Institute funds
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New dimensionless numbers have been introduced in this study to estimate suitable selective laser melting process parameters without extensive modeling or experimentation. The universality of these numbers has been verified by applying them to data from different metals and alloy systems.
One of the main challenges facing selective laser melting processes is finding suitable process parameters to achieve maximum density (pore-free) parts. In this letter, two newly discovered dimensionless numbers are presented that correlate process parameters to a part's density allowing for an initial estimation of suitable process parameters without the need for extensive modeling or experimentation. The prediction is achieved by utilizing the Buckingham-P theorem and the implementation of Pawlowski's matrix transformation method. The universality of the new dimensionless numbers is verified by applying them to selective laser melting data for eight different metals and alloy systems, obtained both experimentally and gathered from the literature. The dimensionless numbers allow for identification of process parameters that will result in a maximum density regime in the as-built part. Finally, a universal scaling law is introduced that can aid in quantitative prediction of process parameters that result in the highest as-built density. (C) 2020 Society of Manufacturing Engineers (SME). Published by Elsevier Ltd. All rights reserved.
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