超小型試験片を用いたマスターカーブ破壊靭性評価
スポンサーリンク
概要
- 論文の詳細を見る
The fracture toughness Master Curve gives a universal relationship between the median of fracture toughness and temperature in the ductile-brittle transition temperature region of ferritic steels such as reactor pressure vessel (RPV) steels. Considering the possible application of the Master Curve method coexistent with the present surveillance program for operating RPVs, the utilization of miniature specimens is quite important for efficient determination of the Master Curve from limited volume of the materials of concern. In this study, fracture toughness tests were conducted for typical Japanese RPV steels using the miniature C(T) specimens with the thickness of 4 mm following the procedure of the ASTM standard. The results showed that the differences in test temperature, evaluation method, and specimen size did not affect the Master Curves, and the fracture toughness indexed by the reference temperature, To, obtained from miniature C(T) specimens were consistent with those obtained from standard and larger C(T) specimens.