Experimental and Numerical Characterization of High Temperature Deformation Behavior of 347H Stainless Steel

Conference · Tue Oct 15 00:00:00 EDT 2024

DOI:https://doi.org/10.31399/asm.cp.am-epri-2024p0099· OSTI ID:2477352

Joy, Jobin K. ^[1]; Rovinelli, A ^[1]; Kumar, M Arul ^[1]; Lebensohn, Ricardo ^[1]; Capolungo, Laurent ^[1]; Ren, Qing-Qiang ^[2]; Yamamoto, Yukinori ^[2]; Poplawsky, Jonathan D. ^[2]; Detrois, Martin ^[3]; Jablonski, Paul ^[3]

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1. Los Alamos National Laboratory (LANL)
2. Oak Ridge National Laboratory (ORNL)
3. NETL

This study investigates how temperature affects the plasticity and thermal creep behavior of 347H stainless steel under uniaxial tension. The research combined experimental testing with advanced computational modeling. Two types of experiments were conducted: uniaxial tensile tests at temperatures from 100°C to 750°C using strain rates of ~10⁻⁴ s⁻¹, and creep tests at temperatures between 600°C and 750°C under various stress levels. These experimental results were used to develop and validate a new integrated mechanistic model that can predict material behavior under any loading condition while accounting for both stress and temperature effects. The model was implemented using a polycrystalline microstructure simulation framework based on elasto-viscoplastic Fast Fourier Transform (EVPFFT). It incorporates three key deformation mechanisms: thermally activated dislocation glide, dislocation climb, and vacancy diffusional creep. The model accounts for internal stress distribution within single crystals and considers how precipitates and solute atoms (both interstitial and substitutional) affect dislocation movement. After validation against experimental data, the model was used to generate Ashby-Weertman deformation mechanism maps for 347H steel, providing new insights into how microstructure influences the activation of different creep mechanisms.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: USDOE Office of Fossil Energy and Carbon Management (FECM)
• OSTI ID: 2477352
• Resource Relation: Conference: Conference Name: 10th International Conference on Advances in Materials, Manufacturing & Repair for Power Plants Location: Bonita Springs, FL, United States Start Date: 10/15/2024 12:00:00 AM End Date: 10/18/2024 12:00:00 AM
• Country of Publication: United States
• Language: English