2. 8 Hydrogen and Neutron Irradiation Induced Hardening in Vanadium Alloys

It is a very dangerous fracture mode because component failed in this mode would have no omen. Fig. 2 SEM fractographes of the tensile specimen of NIFS-V4Cr4Ti alloy with 310 mg·kg-1 H 3 Conclusion NIFS-V4Cr4Ti alloy showed different properties against hydrogen embrittlement in static tension and impact load. The critical hydrogen concentration required to embrittle the alloy was about 215~310 mg·kg-1 on static tension load, but less than 130 mg·kg-1 on impact loading. The different behavior should be taken into consideration in the engineering design of the alloy for fusion application