【摘要】 奥氏体不锈钢 30 8L和 347L的焊缝金属能发生氢致滞后断裂 ,而且比 30 4L母材更敏感。用单边缺口试样动态充氢法测出的氢致滞后断裂门槛应力强度因子 KIH随可扩散氢浓度 C0 的对数而线性下降。 3种材料氢致滞后断口的形貌与 KI 以及 C0 有关 ,当 KI 较高或 C0 较小时是韧窝断口 ;当 KI 较低或 C0 较高时是脆性断口更多还原

【Abstract】 It has been found that hydrogen induced delayed fracture could occur in 308L and 347L weld metal, and the threshold stress intensity for 308L and 347L is lower than 304L austenitic stainless steel. For single edge notched specimen which is dynamically charged hydrogen under load, the threshold stress intensity K IH for 308L, 347L and 304L decreases with the increase of the diffusible hydrogen content C 0. The mode of hydrogen induced delayed fracture in the three materials is correlated with the K I and C 0 value.更多还原