About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
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Presentation Title |
Effect of Heat Treatments on Fabricated Wire and Arc Additive Manufacturing Parts of Stainless Steel 316: Microstructure and Synchrotron X-ray Diffraction Analysis |
Author(s) |
Joao Pedro Oliveira |
On-Site Speaker (Planned) |
Joao Pedro Oliveira |
Abstract Scope |
Large metallic parts can now be fabricated by wire and arc additive manufacturing (WAAM). Undesired phases may appear during the multiple thermal cycles of WAAM.
In this work, 316L stainless steel walls were fabricated by WAAM and submitted to several heat treatments to understand the precipitation kinetics of secondary phases and observe the δ-ferrite dissolution with synchrotron X-ray diffraction measurements. The as-built samples presented δ–ferrite dendrites in an austenite matrix. In-situ observations showed σ precipitation during the first minutes of isothermal holding at 950 °C, from direct precipitation on the δ-ferrite islands.
Solubilization heat treatments at 1050 and 1200 °C resulted in an undissolved amount of ferrite of approximately 6.5 and 0.4 %, respectively. The amount of δ–ferrite showed a direct relationship with the hardness values. We combine advanced materials characterization and thermodynamic calculations to rationalize the microstructure evolution during heat treatment of WAAM-fabricated 316L stainless steel parts. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, Characterization |