Response of hydrogen trapping capability to microstructural change in tempered Fe-0.2C martensite

Thermal desorption spectrometry study of the hydrogen trapping capability of a tempered Fe-0.2C martensite indicated that dislocations in the martensitic substructure are the primary traps and new grain boundaries resulting from recovery and recrystallization of the ferrite matrix are the secondary traps for hydrogen. Cementite has a negligible effect on hydrogen trapping.