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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
Austenitic stainless steels 30 8L and 347L weld metal can cause hydrogen induced hysteresis cracking and are more sensitive than 30 4L base metal. The stress intensity factor KIH of hydrogen induced hysteresis fracture threshold decreases linearly with the logarithm of diffusible hydrogen concentration C0, which is measured by dynamic hydrogen charging method with unilateral notched specimens. Hydrogen-induced hysteresis fracture morphology of the three materials is related to KI and C0. When KI is higher or C0 is smaller, it is dimple fracture; when KI is low or C0 is high, it is brittle fracture