Hydrogen Transport in 34CrMo4 Martensitic Steel: Influence of Microstructural Defects on H Diffusion

Abstract:

The electrochemical permeation technique was used to evaluate the effect of the microstructure on hydrogen diffusivity and hydrogen trapping at room temperature in martensitic steels. A detailed study of the electrochemical permeation technique was first performed in order to identify the boundary conditions of a permeation test in the selected experimental set-up. The validity of the apparent diffusion coefficient derived from this test is also discussed. A 34CrMo4 quenched steel has been selected and designed at three tempering temperatures (200°C, 540°C and 680°C) in order to obtain three different microstructures. According to permeation measurements, H diffusion strongly depends on the microstructure. The material tempered at 540°C exhibits the smallest diffusion coefficient and the largest fraction of reversible traps at room temperature.

• Periodical: Defect and Diffusion Forum (Volumes 323-325)
• Pages: 485-490
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.323-325.485
• Online since: April 2012
• Authors: L. Moli-Sanchez, F. Martin, E. Leunis, J. Chêne, M. Wery
• Keywords: Diffusion Coefficient, Hydrogen, Martensitic Steel, Microstructure, Permeation

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