About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
|
Presentation Title |
NOW ON-DEMAND ONLY - Unveiling Phase Transformation Dynamics of Metals under Additive Manufacturing Conditions by In-situ High-speed X-ray Diffraction |
Author(s) |
Lianyi Chen |
On-Site Speaker (Planned) |
Lianyi Chen |
Abstract Scope |
The lack of understanding of the phase transformation dynamics of metals under additive manufacturing conditions is currently a bottleneck for establishing the relationships between processing condition and microstructure in fusion-based additive manufacturing of metals. Here, I will present our research on revealing phase transformation dynamics during laser melting by in-situ high-speed, high-energy synchrotron x-ray diffraction, with a focus on a precipitation hardening martensite stainless steel, 17-4 PH. We revealed the phase evolution (types of phases, relative fraction of phases) as a function of time in 17-4 PH during laser melting, which helped us to understand the complex microstructures observed in the as-printed 17-4 PH. I will also discuss the design of a 17-4 PH alloy, guided by the revealed phase transformation dynamics, to achieve desired fully martensitic structure across a wide range of cooling rates for additive manufacturing. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, Phase Transformations |