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Environmentally Assisted Cracking: Theory and Practice: On-Demand Poster Session
Sponsored by: TMS Structural Materials Division, TMS: Corrosion and Environmental Effects Committee
Program Organizers: Bai Cui, University of Nebraska Lincoln; Raul Rebak, GE Global Research; Srujan Rokkam, Advanced Cooling Technologies, Inc.; Jenifer Locke, Ohio State University

Monday 8:00 AM
March 14, 2022
Room: Corrosion
Location: On-Demand Poster Hall

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Design and Experimental Validation of Hydrogen Trapping Features in Nickel Alloys: Aman Prasad¹; Alixe Dreano²; Laurent Couturier¹; Frédéric Christien²; Franck Tancret¹; ¹Université de Nantes, Institut des Matériaux de Nantes – Jean Rouxel (IMN), CNRS UMR 6502; ²Mines Saint-Etienne, Univ Lyon, CNRS, UMR 5307 LGF, Centre SMS, F - 42023
    Hydrogen can embrittle metals leading to catastrophic failure. One way to avoid this is by designing alloys with features that trap hydrogen. Most of the phases formed in nickel alloys lead to an increase in hydrogen embrittlement. However, MC carbides and γ’ precipitates with high γ/ γ’ lattice misfit have been evidenced to trap hydrogen in austenitic steels. To experimentally study this in nickel alloys, materials containing only TiC carbides or γ’ precipitates with tailored γ/ γ’ lattice misfit were designed using a combination of computational thermodynamics, genetic algorithm multi-objective optimization, and physical models. These alloys were designed such that the phases can be dissolved at high temperatures and precipitated by heat treatment to quantify the role of these features in hydrogen trapping. The latter was studied with and without the presence of precipitates using permeation and thermal desorption spectroscopy. Further, trapping parameters were extracted using the local equilibrium model.

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