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- Title
Survey of Microstructures and Dimensional Accuracy of Various Microlattice Designs Using Additively Manufactured 718 Superalloy.
- Authors
Li, Huan; Stegman, Benjamin; Shen, Chao; Zhou, Shiyu; Shang, Anyu; Chen, Yang; Flores, Emiliano Joseph; García, R. Edwin; Zhang, Xinghang; Wang, Haiyan
- Abstract
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.
- Subjects
ALLOYS; SPECIFIC gravity; HEAT treatment; TRANSMISSION electron microscopy; HEAT resistant alloys
- Publication
Materials (1996-1944), 2024, Vol 17, Issue 17, p4334
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma17174334