| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
|
Additive Manufacturing: Microstructural and Mechanical Long-term Stability of AM Materials
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| Presentation Title |
Phase Evolution and Mechanical Performance of Additively Manufactured HT9 Ferritic-Martensitic Steel |
| Author(s) |
Madhavan Radhakrishnan, Selvamurugan Palaniappan, Shashank Sharma, Narendra Dahotre |
| On-Site Speaker (Planned) |
Madhavan Radhakrishnan |
| Abstract Scope |
Ferritic-martensitic (F/M) steels, with chromium content between 9 – 12 wt.%, are considered as promising materials for high temperature applications in power plants and nuclear reactors. In this work, laser powder bed fusion and laser directed energy deposition based additive manufacturing techniques were optimized to fabricate bulk, dense HT9 F/M steel. The as-deposited alloys were austenitized and tempered to study the retention of delta ferrite and martensite phases. Electron back scattered diffraction and transmission electron microscopy were employed to characterize the microstructures and identify the phases in as-fabricated and heat-treated alloys. Multiscale multiphysics finite element based thermal model was adopted to understand the thermo-kinetics of the deposition processes and correlate the microstructural evolution. In-situ miniature tensile testing was performed to determine the mechanical performance and strain partitioning in the microstructure. The talk would present the phase evolution and length scale-dependent mechanical behavior in as-deposited and heat treated alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Mechanical Properties |