Hydrogen solubility and diffusion in austenitic stainless steels studied with thermal desorption spectroscopy

摘要

Hydrogen solubility and diffusion in austenitic stainless steels, namely, AISI 310, AISI 301LN, AISI 201 and duplex stainless steel LDX 2101 are studied with thermal desorption spectroscopy (TDS) after electrochemical potentiostatic hydrogen pre-charging. Temperature dependencies of hydrogen desorption for all studied steels manifest a complex main peak caused by hydrogen releasing from the steel lattice by diffusion. Depending on the steel and heating rate the peak is situated from 350 to 500 K and its shape reflects a specific of hydrogen diffusion in stainless steels which are multicomponent and multiphase alloys. Analysis of the TDS curves is based on the hydrogen diffusion model taking into account trapping of hydrogen atoms in the energetically deep interstitial positions in the steel lattice and difference in the hydrogen diffusion mobility in different phases of the steels. Diffusion coefficient of hydrogen and its total content after the same charging procedure are obtained from the TDS curves and compared for all the studied steels.