High-Temperature Hydrogen Attack on 2.25Cr-1Mo Steel: The Roles of Residual Carbon, Initial Microstructure and Carbide Stability
journal contributionposted on 2023-02-17, 12:13 authored by MAM Alshahrani, SW Ooi, M Hornqvist Colliander, GMAM El-Fallah, HKDH Bhadeshia
High temperature hydrogen attack is a damage mechanism that occurs in critical steel components in petrochemical plants and refineries when the hydrogen penetrates the steel and reacts with the carbides within to produce pores containing methane. With the motivation of understanding the role of carbide stability on the reaction with hydrogen, samples of a classic 214Cr-1Mo steel were subjected to a variety of heat treatments that generate a corresponding variety of precipitates, prior to exposure to high-pressure hydrogen in an autoclave. Using quantitative carbide, porosity and microstructural characterisation, it has been possible to demonstrate the roles of four variables: (a) the carbon residue present in the ferrite; (b) the non-equilibrium chemical composition of carbide; (c) the fraction of the carbide that is closest to the thermodynamic equilibrium state and (d) the initial microstructural state, i.e., whether it is martensitic or bainitic prior to heat treatment.
This work was funded by the Oil & Gas Network Integrity Division in the Research & Development Centre, Saudi Aramco. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities.
CitationAlshahrani, M.A.M., Ooi, S.W., Colliander, M.H. et al. High-Temperature Hydrogen Attack on 2.25Cr-1Mo Steel: The Roles of Residual Carbon, Initial Microstructure and Carbide Stability. Metall Mater Trans A 53, 4221–4232 (2022). https://doi.org/10.1007/s11661-022-06809-9
Author affiliationSchool of Engineering
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