EFFECT OF PLASTIC DEFORMATION ON THE HYDROGEN-INDUCED INTERNAL FRICTION PEAK IN AUSTENITIC STAINLESS STEEL.

Abstract

Internal friction was measured at about 550 Hz in the temperature range between 160 K and 350 K for austenitic stainless steel subjected to hydrogen charging and plastic deformation. A hydrogen-induced characteristic peak was found at 300 K for both annealed and deformed specimens of SUS 310S, SUS 316 and SUS 304. Plastic deformation did not alter its height and shape but brought about two sub-peaks at 330 K and 230 K. These observations are explained by the role of dislocations and other defects in the relaxation mechanism.