Improvement in creep properties of Grain Boundary Engineered T91

Gary Was

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gsw@umich.edu

1921 Cooley

T: (734) 763-4675

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Under the Generation IV Reactor initiative, revolutionary improvements in nuclear energy system design in the areas of sustainability, economics, and safety and reliability are being pursued. To meet these goals, advanced nuclear energy systems demand materials that minimize resource use, minimize waste impact, improve proliferation resistance, extend component lifetime, and reduce uncertainty in component performance, all while potentially operating in higher temperature environments, to greater radiation dose, and in unique corrosion environments compared to previous generations of nuclear energy systems. The irradiation performance of structural materials will likely be the limiting factor in successful nuclear energy system development. Based on experience, materials not tailored for irradiation performance generally experience profound changes in virtually all important engineering and physical properties because of fundamental changes in structure caused by radiation damage.This project will develop and characterize the radiation performance of materials with improved radiation resistance. Material classes will be chosen that are expected to be critical in multiple Generation IV technologies. The material design strategies to be tested fall into three main categories: (1) alloying, by adding oversized elements to the matrix; (2) engineering grain boundaries; and (3) microstructural/nanostructural design, such as adding matrix precipitates.The materials to be examined include both austenitic and ferritic-martensitic steels, both classes of which are expected to be key structural materials in many Generation IV concepts. The irradiation program will consist of scoping studies using proton and heavy-ion irradiations of key alloys and tailored alloy condition and examination of materials irradiated in BOR-60 to confirm charged particle results. Examinations will include microstructural characterization, mechanical properties evaluation using hardness and shear punch, and stress corrosion cracking.