About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Microstructure Design in Steels for Power Plant Applications Using Wire Arc Directed Energy Deposition |
Author(s) |
Saket Thapliyal, Wei Tang, Andres Marquez-Rossy, Andrzej Nycz, Yukinori Yamamoto |
On-Site Speaker (Planned) |
Saket Thapliyal |
Abstract Scope |
Wire-arc directed energy deposition (WADED) additive manufacturing (AM)
enables manufacturing scale-up and repair of reduced activation ferritic-martensitic (RAFM) steel components for power plant applications. However, the varying thermokinetic parameters-induced microstructural heterogeneities – that are prevalent in AM processes – can lead to deformation localization and a subsequent deterioration of mechanical properties during service. Therefore, a process parameters based control of thermokinetic parameters is important for mitigating microstructural heterogeneities. In this talk, we report the multi-scale microstructural heterogeneities, including varying attributes of the second phase particles, martensitic laths, and grains in a WADED processed P91 steel. The implications of discussed heterogeneities for mechanical behavior are demonstrated. WA-DED processing parameters that enable mitigation of these microstructural heterogeneities are also revealed. Results from mechanical testing demonstrate that the control of process thermokinetics enable mitigation of deformation localization. Findings pave the way for microstructure design and fabrication of creep resistant RAFM steels with WADED. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |