鋼のおくれ破壊におよぼす鋼中の水素拡散の影響(第 1 報) : 水素拡散距離の変化とおくれ破壊との相関性

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Hydrogen embrittlement of steel has been treated as one of the phenomena of the delayed fracture. In this case, the applied stress and the behavior of hydrogen in steel have a great importance. In the previous studies, the behavior of hydrogen in steel has been examined by the experiments of hydrogen permeability through the steel membrane and hydrogen occuludability in steel at room temperature. On the other hand, authors have investigated the relation between the applied stress and the fracture time of hydrogenated steel. In the present paper, an effect of the behavior of hydrogen on the phenomena of the delayed fracture was examined by using Constant Load Rupture testing. The tensile specimens were hydrogenated by cathodic method under constant load. The relation among the applied stress, the diffusion distance and the fracture time was examined. The results obtained are as follows; The square of hydrogen diffusion distance and the fracture time of specimen are linearly a related. Therefore, diffusion of hydrogen in steel is thought to depend upon Fick's law, as aturhors described previously, and the diffusion coefficient of hydrogen in HT-80 steel is in the order of (10)^<-6>∿(10)^<-7>(cm)^2/sec in this experimental condition. Moreover, in the case of C. L. R. testing, if the specimens are applied with a stress, varying the diffusion distance of hydrogen, the concentration of hydrogen in the fracture part of specimens would be always constant and the difference of fracture time would depend upon the time when hydrogen is segregated to the same concentration through various distances of diffusion.
社団法人溶接学会の論文
1969-09-25

鋼のおくれ破壊におよぼす鋼中の水素拡散の影響(第 1 報) : 水素拡散距離の変化とおくれ破壊との相関性

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