3518 高耐候性鋼および水素チャージ材のぜい性-延性遷移挙動と破壊限界値(S20-4 水素環境での静的強度と破壊じん性,S20 材料強度特性に及ぼす水素の影響)

抄録

Storage tanks and pipelines for transporting gaseous fuel are considered to be use in low temperature environment. In the materials used for those infrastructures, cryogenic brittlement and hydrogen brittlement are possible to occur one upon another. In this study, fracture experiments for hydrogen charged materials of COR-TEN O steel and its welded material were carried out over the temperature range from -196℃ to room temperature. Through the experimental results, brittle-ductile transition behavior was observed with the increase of temperature in addition to the fracture mode change from mode I (opening) type to mode II (in-plane shearing) type. It was shown that, for the hydrogen charged materials, a dramatic increase of fracture resistance occurs by brittle-ductile transition.