Hydrogen Interaction with Stainless Steel 12Cr18Ni10Ti Containing Radiogenic ³He

Mechanical properties, structural changes and hydrogen interactions with stainless steel 12Cr18Ni10Ti subjected to accelerated radiogenic ³He buildup by means of “tritium trick” technique were studied. After saturation with tritium up to equilibrium concentration at a pressure 50 MPa and T=773 K the samples were rapidly cooled to room temperature and aged at this temperature up to the buildup of a predetermined ³He concentration. Kinetics of helium thermal release, hydrogen transport, trapping and accumulation in steel containing various concentration of ³He, synergistic influence of ³He and hydrogen on mechanical properties of steel containing up to 500 appm ³He and structural changes at various ³He concentrations are discussed.