Survey of Microstructures and Dimensional Accuracy of Various Microlattice Designs Using Additively Manufactured 718 Superalloy

Microlattices hold significant potential for developing lightweight structures for the aeronautics and astronautics industries. Laser Powder Bed Fusion (LPBF) is an attractive method for producing these structures due to its capacity for achieving high-resolution, intricately designed architectures....

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Bibliographic Details
Published in:Materials 2024-09, Vol.17 (17), p.4334
Main Authors: Li, Huan, Stegman, Benjamin, Shen, Chao, Zhou, Shiyu, Shang, Anyu, Chen, Yang, Flores, Emiliano Joseph, García, R Edwin, Zhang, Xinghang, Wang, Haiyan
Format: Article
Language:English
Subjects:
Accuracy
Additive manufacturing
Aeronautics
Astronautics
Cracks
Defects
Density
Design
Lasers
Lightweight
Mechanical properties
Microstructure
Morphology
Nickel base alloys
Powder beds
Precipitates
Precipitation heat treatment
Production methods
Scanning electron microscopy
Specific gravity
Superalloys
Temperature
Tensile strength
Weight reduction
Yield stress
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Summary:Microlattices hold significant potential for developing lightweight structures for the aeronautics and astronautics industries. Laser Powder Bed Fusion (LPBF) is an attractive method for producing these structures due to its capacity for achieving high-resolution, intricately designed architectures. However, defects, such as cracks, in the as-printed alloys degrade mechanical properties, particularly tensile strength, and thereby limit their applications. This study examines the effects of microlattice architecture and relative density on crack formation in the as-printed 718 superalloy. Complex microlattice design and higher relative density are more prone to large-scale crack formation. The mechanisms behind these phenomena are discussed. This study reveals that microlattice type and relative density are crucial factors in defect formation in LPBF metallic alloys. The transmission electron microscopy observations show roughly round γ″ precipitates with an average size of 10 nm in the as-printed 718 without heat treatment. This work demonstrates the feasibility of the additive manufacturing of complex microlattices using 718 superalloys towards architectured lightweight structures.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17174334