About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Microstructures, Mechanical Properties, and Fatigue Damage Mechanisms in Laser Powder Bed and Conventionally Cast Al-10Si-0.4Mg Alloys |
Author(s) |
Timothy D. Piette, Robert J. Warren, Anthony G. Spangenberger, Diana A. Lados |
On-Site Speaker (Planned) |
Timothy D. Piette |
Abstract Scope |
Laser powder bed (LPB) manufactured Al-10Si-0.4Mg was studied in as-fabricated, stress relieved, T6, and HIP+T6 conditions to understand processing, post-processing, and build orientation effects on mechanical properties. Associated microstructural changes, tensile properties, and fatigue crack growth (FCG) microstructure-scale mechanisms were investigated and compared with those of the conventionally cast counterparts. Anisotropic residual stresses in the as-fabricated condition affect the FCG thresholds, resulting in differences between build orientations. Heat treatments significantly alter the microstructure, affecting the orientation dependence of the properties and changing both FCG threshold values and crack growth mechanisms at different stages. Complementary fatigue testing up to the very-high-cycle fatigue regime was performed to relate the effects of build orientation, heat treatment, surface condition, and defect morphology and distribution (evaluated using x-ray computed tomography) to fatigue life. Recommendations for microstructure and post-processing optimization and integrated design for high-integrity fatigue-critical applications will be provided and discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, |