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Hydrogen Diffusion and Trapping in Low-Alloy Tempered Martensitic Steels by L. Cupertino-Malheiros; A. Oudriss; F. Thébault; M. Piette; X. Feaugas is a Engineering article available to read on EtoBox.

What is Hydrogen Diffusion and Trapping in Low-Alloy Tempered Martensitic Steels about?

Abstract Structural characterization of ten low-alloy tempered martensitic steels of varied composition (C, Cr, Mo, Mn, and V contents) and tempering temperature was performed to question the impact of microstructural features on hydrogen state. Thermal desorption spectroscopy and electrochemical permeation data for each alloy were acquired and interpreted in view of hydrogen diffusion/trapping models. This large database provided precise information regarding solubility, diffusion coefficient, activation energies for diffusion and trapping, hydrogen distribution into lattice, and reversible and irreversible trap sites. The results reveal a tendency for the apparent diffusion coefficient to decrease with increasing yield strength, mainly related to the density of trap sites rather than lattice diffusion. Estimates of trapping at dislocation core could explain the irreversible trapping in the six steels with sub-surface hydrogen concentration smaller than 1.5 wppm. For the four steels with higher solubility, it was calculated the superabundant vacancies concentration necessary to justify the amount of trapping sites. The steel with the highest Mo and V contents presented superior so

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Author

L. Cupertino-Malheiros; A. Oudriss; F. Thébault; M. Piette; X. Feaugas

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Engineering (Physical Sciences)