Effect of hydrogen on crack growth behavior in F82H steel using small-size specimen

微小試験片を用いたF82H鋼のき裂成長に及ぼす水素の影響

伊藤 譲; 齋藤 正博*; 阿部 勝憲*; 若井 栄一  

Ito, Yuzuru; Saito, Masahiro*; Abe, Katsunori*; Wakai, Eiichi

Crack growth is a one of the key mechanical properties of the design evaluation in fusion materials to be tested at the High Flux Test Module (HFTM) in IFMIF. In the IFMIF/EVEDA project under the BA agreement, effect of hydrogen on the crack growth in F82H steel was investigated by using the relatively small size specimen. The shape of an Wedge Opening Load (WOL) specimen is adapted as a miniaturized specimen because the loading mechanism of WOL specimen is relatively simple compared to that of the other notched specimen. The hydrogen charging process was conducted for about 600 hours in the electrolytic solution with the current density of -2 mA/cm at 35C. And then, the testing load, = 30 MPa, was applied to the specimen for about 337 hours at room temperature in air as the crack growth rate test. From these results, the small size specimen used in this study is thought to be adequate to evaluate the effect of hydrogen on the crack behavior in F82H steel.