Influence of lithium-lead eutectics and hydrogen on fatigue of certain austenitic steels

Low-and high-cycle fatigue of austenitic alloys 04X16N11M3T and 03X20N45M4BCh have been investigated under rigid pure bending loading in air,hydrogen and lithium-lead eutectics at 80, 250 and 350 degree C. Deformation amplitude did not exceed ± 3%. Decrease of durability was observed at 250 and 350 degree C at the presence of lithium-lead eutectics under low-cycle loading and under high-cycle loading, which increased with amplitude growth: at 250 degree C more intensive than at 350 degree C. In gaseous hydrogen the durability of 04X16N11M3T alloy increased as compared to that in air at low-cycle loading, while the durability of 03X2045M4BCh alloy decreased. Hydrogen does not influence on the limited endurance of both alloys at low-cycle loading. The deformation amplitude decreases at fatigue limit value on the basis of 107 cycles in both hydrogen and lithium eutectics