About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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Presentation Title |
Dislocation Evolution and Residual Stresses in FCC and BCC Alloys Produced by Laser Powder Bed Fusion |
Author(s) |
Sravya Tekumalla, Matteo Seita, Stefan Zaefferer |
On-Site Speaker (Planned) |
Sravya Tekumalla |
Abstract Scope |
Owing to the high cooling rates and steep thermal gradients, laser-powder bed fusion (LPBF) of metals results in the formation of hierarchical microstructures such as melt pools, grains, cellular structures, and copious amounts of dislocations. In this work, we study this complex microstructure in two different alloys-austenitic stainless steel 316L (FCC) and an in-situ alloyed β-Ti alloy (BCC) produced by LPBF technique. Specifically, we probe the differences in the elemental segregation, arrangement of cellular structures, and dislocation evolution by means of electron channeling contrast imaging under controlled diffraction conditions (cECCI). Additionally, we also study the type-III residual stresses in the two alloys using cross-correlation EBSD. Our findings reveal a stark contrast in the dislocation arrangement, lattice strains and residual stresses in the two model FCC and BCC structured alloys. The results from this work provide insights to advance the current knowledge on the dislocation structures formation mechanisms in metal AM. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, Other |