About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
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Presentation Title |
In-situ Microscopy of Crack Initiation and Growth in Laser Powder Bed Additively-manufactured Ti-6Al-4V |
Author(s) |
Matthew Krug, JoAnn Ballor, Lewis Forman, Michael Velez, Molly Walters, Sushant Jha, Carl Boehlert |
On-Site Speaker (Planned) |
Sushant Jha |
Abstract Scope |
Laser powder-bed fusion (LPBF) of Ti-6Al-4V has become widely adopted in the aerospace and medical equipment industries, which both trade in high-value near-net shaped parts that are cyclically-loaded and have low tolerance for failures. Fabrication defects inherited from the LPBF process can act as fatigue crack initiation sites. In this study, fatigue specimens of LPBF Ti-6Al-4V were tested in-situ using SEM imaging and EBSD orientation measurements. Crack initiation at surface defects and subsequent crack growth were observed as they occurred during cyclic loading. Defect size and shape, and the local phase and orientation distributions were characterized to understand their role in site selection for crack nucleation and growth. The effects of load orientation relative to build direction, and of a hot isostatic pressing heat treatment will be presented and discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Other |