Evaluation of hydrogen trapping in high strength steels by thermal desorption spectroscopy

► Diffusible hydrogen desorbs quite fast from the material. ► After 4 h at low pressure only trapped hydrogen remains. ► Diffusible hydrogen clearly caused ductility loss after hydrogen charging. ► TDS indicated similar activation energies for the traps in the different materials. ► Only TRIP steel had a high temperature desorption peak.