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Report No.
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Crack growth behavior of F82H steel in the 288$$^{circ}$$C water

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

Crack growth is a one of the key mechanical properties for the design evaluation in fusion materials to be tested at the High Flux Test Module (HFTM) in IFMIF. In this study, crack growth rate of the F82H steel in the 288$$^{circ}$$C water was investigated by using an almost standard size specimen in order to avoid the specimen size effect on the crack growth. It was found that the typical intergranular fracture surface could be obtained during the crack propagation even at room temperature. Chromium carbide, Cr$$_{23}$$C$$_{6}$$, precipitation along the grain boundaries in F82H steel may influence the intergranular fracture under the fatigue crack propagation at room temperature in air. The possible evidence of crack growth in the 288$$^{circ}$$C water was also observed. The crack growth rate at 30 MPa $$sqrt[]{m}$$ in the 288$$^{circ}$$C water was conservatively estimated to about 7$$times$$10$$^{-11}$$ m/s. Further systematic study of crack growth, and the improvement of surface finishing against crack propagation are necessary for the design evaluation in fusion materials.

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