About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Presentation Title |
Effect of Heat Treatment on the Micro-/Defect-structure and Mechanical Behavior of Additively Manufactured Alf357 Aluminum Alloy |
Author(s) |
Md Faysal Khan, Paul R. Gradl, Donald Godfrey, Jacky Diemann, Shuai Shao, Nima Shamsaei |
On-Site Speaker (Planned) |
Md Faysal Khan |
Abstract Scope |
This study investigated the effect of heat treatment (HT) on the micro-/defect-structure and room temperature tensile and fatigue behaviors of AlF357 fabricated using laser powder bed fusion. Two different HT sequences, consisting of stress relieving (SR), hot isostatic pressing (HIP), and T6 (i.e., SR+HIP+T6 and SR+T6+HIP), were examined. For SR+T6+HIP, all defects still present after T6 were eliminated after the final HIP. For SR+HIP+T6 a few defects closed after HIP had reopened. The grain structure remained comparable for both HTs. SR+HIP+T6 exhibited approximately 45% and 32% higher yield and ultimate tensile strength, respectively, due to increased Mg2Si precipitate population and size compared to SR+T6+HIP. However, the presence of large and populous η-Fe (Al8Mg3FeSi6) precipitates lowered ductility by around 6% for SR+HIP+T6 compared to SR+T6+HIP. Specimens in SR+HIP+T6 showed higher fatigue resistance for the alloy than those in SR+T6+HIP. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |