|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Design and Experimental Validation of Hydrogen Trapping Features in Nickel Alloys
||Aman Prasad, Alixe Dreano, Laurent Couturier, Frédéric Christien, Franck Tancret
|On-Site Speaker (Planned)
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.