Sensitivity of additively manufactured AA7075 to variation in feedstock composition and print parameters

Here we developed a combined finite element and CALPHAD based model of the Laser Powder Bed Fusion (LPBF) process for AA7075 alloy that considers the effect of feedstock composition and print parameters. A single-pass of a laser on a layer of AA7075 alloy powder has been considered. Sensitivity of t...

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Bibliographic Details
Published inJournal of manufacturing processes Vol. 73; no. C
Main Author Momeni, Kasra
Format Journal Article
LanguageEnglish
Published United States Society of Manufacturing Engineers; Elsevier 23.11.2021
Subjects
AA7075 alloy
additive manufacturing
CALPHAD
ENGINEERING
finite element analysis
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Summary:Here we developed a combined finite element and CALPHAD based model of the Laser Powder Bed Fusion (LPBF) process for AA7075 alloy that considers the effect of feedstock composition and print parameters. A single-pass of a laser on a layer of AA7075 alloy powder has been considered. Sensitivity of temperature evolution and melt pool geometry to variation in the stoichiometry of the feedstock powder and laser source characteristics have been studied. Our results indicate that deviation (up to 10%) of the feedstock composition from the AA7075 raises the maximum temperature and increases melt pool size. Excess Cu content shows the largest melt pool width and depth among all the cases. The peak temperature is higher than the standard feedstock composition in all cases, except when the Cu concentration is reduced. Increasing the scan power also results in a higher peak temperature and a larger melt pool size. Furthermore, the temperature's rise time increases by lowering the scan speed.
Bibliography:National Aeronautics and Space Administration (NASA)
National Science Foundation (NSF)
University of Alabama
AR0001066; CBET-2042683
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
ISSN:1526-6125
2212-4616