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Meeting MS&T21: Materials Science & Technology
Symposium Nucleation of Solid-State Phase Transformations
Presentation Title Observing the Solid-state Processes under Additive Manufacturing Conditions Inside the TEM
Author(s) Sriram Vijayan, Meiyue Shao, Avantika Gupta, Rohan Casukhela, Joerg Jinschek
On-Site Speaker (Planned) Sriram Vijayan
Abstract Scope Rapid thermal cycling and steep thermal gradients are the dominant process conditions during metal based additive manufacturing (AM) techniques such as powder bed fusion. These process conditions cause reduced partitioning of solute and thereby lead to the formation of metastable microstructures with an anisotropic, columnar morphology. To fabricate AM components with equiaxed microstructures, a careful understanding of AM process conditions is still needed. In this study, we describe the use of a MEMS-based heating stage to simulate ‘AM like’ processes inside a transmission electron microscope (TEM). This modified MEMS device enables us to study the microstructural response of the material under the combined influence of large thermal gradients (106 K/m) and rapid thermal cycling. We expose TEM lamellae, obtained from AM builds, to ‘AM like’ conditions in-situ to understand fundamental processes that contribute to the microstructural evolution of AM Ti-6Al-4V and Inconel 738 during the AM build process.
Proceedings Inclusion? Undecided


3-dimensional Observation of Bainite from Austenite Grain Boundary in 0.6wt% Carbon Steel.
Critical Nuclei at Hetero-phase Interfaces
Effect of Cooling Rate and Austenitic Grain Size on the Austenite Decomposition Kinetics in a Low- carbon Steel
Formation of the γ’’’-Ni2(Cr, Mo, W) Phase during Two-step Heat Treatment in Haynes® 244® Alloy
Identification of Critical Nucleation Events by the Gromov-Wasserstein Distance
Investigation of Nucleation Mechanisms Associated with the Formation of Coprecipitates in Ni-based Superalloys
Modeling Microstructure Evolution Using the Steepest-entropy-ascent Quantum Thermodynamic Framework
Observing the Solid-state Processes under Additive Manufacturing Conditions Inside the TEM
P1-28: Structure Influenced Rapid Hydrogenation Using Metal-acid Contacts on Crystallographically Oriented VO2 Thin Films

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