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Meeting Materials Science & Technology 2020
Symposium Phase Transformations in Additively Manufactured Materials
Presentation Title Understanding the Effect of Thermal Gradients on Additively Manufactured (AM) Builds Using In Situ TEM
Author(s) Sriram Vijayan, Meiyue Shao, Joerg Jinschek
On-Site Speaker (Planned) Sriram Vijayan
Abstract Scope Complex additive manufacturing (AM) process conditions typically result in parts with anisotropic microstructures and sub-optimal mechanical performance. The cyclic deposition of new layers using electron beam powder bed fusion (EB PBF) exposes ‘previously deposited’ layers to directional reheating, large thermal gradients and rapid cooling rates. Previous studies of solid-solid phase transformations in Ti-6Al-4V (Ti64) have aided in optimizing processing routes to yield Ti64 with desirable mechanical properties. However, such transformations in Ti64 under AM process conditions are not yet well understood. Here, we use a micro-heater device to simulate AM-like process conditions (106 K/m and 103K/s) across a Ti64 sample inside the transmission electron microscope (TEM). In this study, heating experiments were performed to identify whether V diffusion is the governing process in the α’ → β → α’ + β transformation under large thermal gradients and rapid thermal cycling in Ti64 inside the TEM at high spatial resolution


Design of Post-fabrication Heat Treatments for Ti Free Grade 300 Maraging Steel Manufactured Using Laser Powder Bed Fusion (LBPF) Process
Development of Non-equilibrium Thermodynamic Tools for Additive Manufacturing
Effects of Laser Powder Bed Fusion Parameters and Heat Treatment on Microstructure and Mechanical Behavior of Inconel 718 Alloy
In-situ Characterization of Rapid Phase Evolution of AM Metals with High Energy Synchrotron X-ray Diffraction
Laser Powder Bed Fusion of Grade 300 Maraging Steel for Tooling Applications
Laser Powder Bed Fusion of Stainless Steel 15-5PH: Microstructure Analysis and Process Optimization
Microstructure Engineering through Post-heat Treatment of Inconel 718 Superalloy Made by Laser Powder Bed Fusion
Phase Field Simulations of Cellular-to-Dendritic Transition under Additive Manufacturing Conditions
Process Optimization and Microstructure Analysis to Understand Laser Powder Bed Fusion of Stainless Steel 316L
Rapid Solidification of Aluminium 6061 Using Fast Scanning DSC
Real-time Observation of the Competition between Ferritic vs Austenitic Solidification in Micro-laser Welding of 316L Using Synchrotron X-ray Diffraction
Understanding the Effect of Thermal Gradients on Additively Manufactured (AM) Builds Using In Situ TEM

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