|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Design of Nickel Alloys and Superalloys with a High Resistance to Hydrogen Embrittlement
||Franck Tancret, Miles Stopher, Edern Menou, Gérard Ramstein, Pedro Rivera-Díaz-del-Castillo
|On-Site Speaker (Planned)
In nuclear and in oil & gas applications, nickel alloys are used in conditions where hydrogen embrittlement (HE) can occur. Literature suggests, with limited evidence, that MC carbides and γ’ with a high γ/γ’ lattice misfit may act as hydrogen traps and increase the resistance to HE (RHE). Exploiting both computational thermodynamics (Thermo-Calc CALPHAD software) and a Gaussian process model for γ/γ’ lattice misfit, genetic algorithm multi-objective optimisation (GAMOO) was used to design model alloys to verify experimentally such features, by targeting alloys containing either only finely dispersed MC vanadium carbides, or only γ’ with a controlled γ/γ’ lattice mismatch. GAMOO is finally used to optimise simultaneously all the relevant structural, chemical and microstructural characteristics; new superalloys are designed, having combinations of good strength, corrosion resistance and resistance to hydrogen embrittlement, for nuclear and oil & gas applications.
||Planned: Supplemental Proceedings volume