626 昇温脱離水素分析による高強度低合金鋼の動的環境ぜい化き裂進展特性評価

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The influences of dynamic loading conditions on the environmentally induced cracking under dynamic loading have been investigated in two kinds of 1500 MPa grade high-strength steels, a vanadium-added steel (V content : 0.3% : 15LA steel) and a vanadium-free steel (V-free steel). The corrosive environment used was a 3% NaCl+3g/L NH_4SCN solution at 25℃. The tests were conducted at the cathodically charged condition with a constant cathodic current density of 3 mA/(cm)^2. The threshold stress intensity of the static SCC, K_<ISCC>, obtained in the 15LA steel was lower than that in the V-free steel, with higher crack growth rate. In the case of the V-free steel. The threshold stress intensity factor of dynamic SCC under a small vibratory loads superimposed on a sustained load, K_<DSCC>, was almost equal to the K_<ISCC> value of the 15LA steel became lower than the K_<ISCC>. The crack growth rate of both steels under low-frequency varying load at a stress ratio R of 0.1 and a stress cycle frequency of 0.1 Hz was enhanced compared with that in dry air due to cyclic stress corrosion cracking, with lower threshold than K_<ISCC>. The hydrogen evolution rate obtained by thermally desorption analyses was increased by the cathodic charging, with a lower temperature peak. The noticeable difference in the hydrogen evolution behavior between the two steels was that the hydrogen evolution at 100℃ to 150℃ increased in the 15LA steel when a longer cathodic charging was applied to the sample.
社団法人日本機械学会の論文

626 昇温脱離水素分析による高強度低合金鋼の動的環境ぜい化き裂進展特性評価

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