308L和347L奥氏体不锈钢焊缝金属能发生氢致滞后断裂,而且比304L母材更敏感.用单边缺口试样动态充氢测出的氢致滞后断裂门槛应力强度因子KIн随可扩散氢浓度c0的对数而线性下降,即KIн=85.2-10.7lnc0(308L),KIH=76.1 9.3lnc0(347L),KIн=91.7-10.1 lnc0(304L).三种材料氢致滞后断口形貌与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
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