鋼鐵氫致裂縫成長之新看法

Some New Aspects of Hydrogen-Assisted Crack Growth in Steels

論文描述氫脆在肥粒鐵鋼材中造成破裂機構的相關現象。裂縫前進的特徵是以在準劈裂區域上的條紋沿裂縫方向垂直傳遞。試片開口的效應可證實拉伸應力對裂縫生長的促進。本文亦對含3%矽之鐵合金中，寬尺度（0.3nm間距）及窄尺度（30nm間距）兩種條紋作出觀察。

The paper describes features associated with the ''brittle'' cracking mechanism of hydrogen embrittlement in ferritic steel. Such crack advance is characterised by the presence of striations on ''quasi-cleavage'' facets running roughly orthogonal to the crack propagation direction. A notch effect is observed, from which is deduced that the cracking is promoted by tensile stress. In iron-3% silicon, observations have been made of both coarse-scale (0.3µm spacing) and fine-scale (30nm spacing) striations.