About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
A-35: Measurements and Predictions of Residual Stresses in AM Ti-6Al-4V NIST Challenge Specimens |
Author(s) |
James Sobotka, Matthew Kirby, Sheng-yen Li |
On-Site Speaker (Planned) |
James Sobotka |
Abstract Scope |
In 2018, the National Institute of Standards and Technology (NIST) presented additive manufacturing (AM) benchmark tests as a challenge for the modeling and simulation community to develop predictive models of the AM build process. These tests included a residual stress/distortion challenge problem built from Inconel 625 and 15-5PH stainless steel using laser powder-bed fusion machines. For this challenge, NIST introduced a bridge structure geometry with twelve variably sized legs. In 2019, we followed NIST specifications to produce the same geometry using Ti-6Al-4V in a Renishaw AM250 machine. This presentation describes the build process, shows 3D micro-CT scans pre/post-sectioning, and presents distortion measurements following sectioning of the specimen from the build plate. Furthermore, this presentation describes a process-modeling framework to predict residual stresses using a sequential thermo-mechanical approach driven by laser scan strategy. This presentation closes with results from sensitivity studies and validation predictions that showcase predictive capabilities. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |