About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
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Presentation Title |
Fatigue Crack Propagation in Additively Manufactured Titanium Alloy with Lamellar and Bi-lamellar Microstructures |
Author(s) |
Zhiying Liu, Yu Zou |
On-Site Speaker (Planned) |
Zhiying Liu |
Abstract Scope |
Enhancing fatigue crack growth resistance (FCGR) is crucial for engineering applications of additively manufactured titanium alloys. However, the local plastic deformations that govern the fatigue crack growth in additively manufactured titanium alloys with lamellar microstructure are still unclear. Here, we investigate the fatigue crack growth in additively manufactured Ti-6Al-2Zr-Mo-V alloy with lamellar and bi-lamellar α+β microstructures, respectively. The plastic deformation behaviours at the front of cracks include well-known slip banding (slip nucleation and transfer) and unwell-known local shearing in both samples. We reveal a dual role of local shearing in fatigue crack growth: the local shearing direction along and perpendicular to fatigue crack can promote and block its propagation, respectively. The formations of slip activities and local shearing and their influences on the fatigue crack growth in the lamellar and bi-lamellar microstructures are also discussed. This study enhances the understanding of fatigue crack growth in additively manufactured titanium alloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Mechanical Properties |