The interaction of hydrogen with retained austenite in automotive steel grades

This work investigates the effect of a constant load on hydrogen diffusion through transformation induced plasticity (TRIP)-assisted and quenching partitioning (Q&P) steel containing metastable retained austenite by combining electrochemical permeation thermal desorption spectroscopy. Furthermore, comparison is made with ferrite/martensite dual phase (DP) steel, which serves as reference material not any austenite. Material samples are placed at different external loading conditions, ranging from 50% to 125% yield stress. The transients indicate response between TRIP Q&P steel. In latter, delayed for all stressed even stresses in elastic regime, whereas steels follows same behaviour DP increased diffusivity regime decreased plastic regime. From subsequent spectroscopy performed specimens after test, spectra show high temperature peak present spectrum unloaded sample. Thus indicating that capable trapping loaded condition. Due difference matrix surrounding phase, it reasoned discrepancy due internal higher hardness compared