Correlation between vanadium carbide size and hydrogen trapping in ferritic steel. (15th July 2018)

• Record Type: Journal Article
• Authors: Turk, Andrej; San Martín, David; Rivera-Díaz-del-Castillo, Pedro E.J.; Galindo-Nava, Enrique I.
• Is Part Of: Scripta materialia. Number 152(2018)
• Page Start: 112
• Page End: 116
• Publication Date: 2018-07-15
• Subjects: 4. Hydrogen diffusion -- 3. Ferritic steels -- 4. Microstructure -- 3. Carbides -- Thermal desorption analysis; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.04.013
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Hydrogen trapping on vanadium carbides (VC) was studied in a low-carbon ferritic steel. Thermal desorption analysis was performed on two conditions with different carbide sizes but identical volume fractions. Smaller carbides with a higher effective surface area trapped significantly more hydrogen. A correlation between carbide size and hydrogen trap density was established, suggesting that trapping is surface-dominant and a scaling law for trap density was derived. The amount of trapped hydrogen was overall much lower than previously reported for VC-containing martensitic steels. It is therefore suggested that in the absence of a dislocated matrix VC traps relatively little hydrogen. Graphical Abstract: