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 |
Enhancing the Fatigue Performance of AM Metals via Conformal Coatings that Activate Uniform Surface Remelting and Smoothening
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Author(s) |
Kendall J. Yetter, Michael Sangid, William LePage |
On-Site Speaker (Planned) |
Kendall J. Yetter |
Abstract Scope |
Mitigating surface roughness is a key to enhanced fatigue performance of AM metals. However, current surface treatment options are not sufficient for complex AM parts, such as internal channels or microlattices. Surface treatments for AM must be able to address beyond line-of-sight surfaces, as well as uniformly treat all component surfaces for predictable fatigue performance. This work introduces a new surface treatment strategy through a transient surface remelting process. Surface remelting is triggered during heat treatment with a uniform, highly conformal coating, such as films fabricated with atomic layer deposition or electroplating. During heat treatment, the coating triggers local melting by activating a eutectic reaction, resulting in smoother surfaces and better fatigue performance. This talk will describe this new class of surface treatments with the specific case of AM Ti-6Al-4V. By using conformal coatings of Cu, we have demonstrated pronounced surface smoothening that increases the fatigue strength by approximately 30%. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Other, Thin Films and Interfaces |