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Atomic-scale investigation of H-trapping by fine NbC precipitates in a low C ferritic steel.
- Source :
-
Scripta Materialia . Sep2023, Vol. 234, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- The origin of hydrogen trapping by the Nb-carbide precipitates in a ferritic steel was studied at the atomic scale with the help of HRTEM (high resolution transmission electron microscopy) and 3D-APT (atom probe tomography). A Nb-added ferritic steel was prepared in the laboratory and subjected to aging after solutionizing treatment to have fine Nb-carbide precipitates in ferrite matrix. The precipitation kinetics were simulated beforehand using TC-Prisma in Thermocalc software. A large number of nanometer-sized Nb-carbide precipitates were observed in the ferrite matrix using TEM. 3D-APT studies on the steel sample electrolytically charged with D (deuterium) showed that the D atoms are trapped more within the precipitates than at the precipitate-matrix interfaces. It has been argued that H atoms occupy the vacant lattice sites on carbon sub-lattice sites in non-stoichiometric NbC 0.83. [Display omitted] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13596462
- Volume :
- 234
- Database :
- Academic Search Index
- Journal :
- Scripta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 164245728
- Full Text :
- https://doi.org/10.1016/j.scriptamat.2023.115537