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
|
Presentation Title |
Fatigue Crack Initiation in Additively Manufactured Alloys: Synergistic Effect of Microstructure and Volumetric Defects |
Author(s) |
Shuai Shao, Nima Shamsaei |
On-Site Speaker (Planned) |
Shuai Shao |
Abstract Scope |
The fatigue behavior of additively manufactured alloys has different sensitivity to the presence of volumetric defects. For instance, fatigue crack initiation in IN718 is often from persistent slip bands while that in Ti-6Al-4V and 17-4 PH stainless steels is almost always from volumetric defects. This presentation focuses on synergistic effects of volumetric defects and microstructure on fatigue behavior of laser beam powder bed fusion fabricated alloys. This synergy is central to address the compromised and/or hard-to-predict structural integrity (such as fatigue properties) of these alloys due to the presence and variability of volumetric defects and the surrounding microstructure. To provide understanding on this synergy, a simulation guided, experimentally validated research effort has been undertaken. The simulations include both linear elastic finite element analysis of cracks surrounding volumetric defects and crystal plasticity modeling of the fatigue crack initiation to assess the influence from microstructure. |
Proceedings Inclusion? |
Planned: |