The effect of Nb on the hydrogen embrittlement susceptibility of Q&P steel under static and dynamic loading

In the present study, effect of Niobium (Nb) on hydrogen embrittlement resistance Quenched and Partitioning (Q&P) steel is investigated. For this purpose, uptake level its impact mechanical properties a Nb-free 0.024 wt% Nb Q&P are thoroughly analysed. The trapping capacity evaluated via thermal desorption spectroscopy (TDS). In-depth analysis kinetics at different heating rates allows identification quantification available sites. sensitivity both steels characterized using static dynamic tensile tests. addition results in an increase concentration by more than 25%. larger content steel, as result higher fraction grain boundaries/interphases, gives rise to severe compared one. retained austenite low stability detrimental due high carbon martensite formed when straining. This susceptibility microalloyed brittle character that forms easily during Under loading conditions, minimal, which attributed reduced diffusion suppression transformation induced plasticity (TRIP) adiabatic heating.