Testing temperatures and deflection rates dependencies of hydrogen embrittlements on RAFs

It is well known that diffusible hydrogen in steels causes the reduction of fracture strength of steels. The hydrogen is usually trapped by vacancies, dislocations, grain boundaries, precipitates, voids, etc. The trapped hydrogen is thermally released from the trap sites. Thermal desorption spectroscopic (TDS) method is able to investigate the hydrogen trapping states in a material. In this study, the hydrogen embrittlement of a reduced activation ferritic steels (RAFs), JLF-1, is studied using a hydrogen cathodic electrolytic charging method. The amount of charged hydrogen into material was between 0 and 3.63 mppm. The small punch (SP) test and 1.5 mm charpy V-notch (1.5 mm CVN) test focusing on the test temperature and deflection rate dependencies studied at the between 20 and −196 °C, and deflection rates at 1 m/s and 0.2 mm/min.