【摘要】 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 ＫＩＨ随可扩散氢浓度 ｃ０的对数而线性下降，即 ＫＩＨ＝８５．２－１０．７ｌｎｃ０（３０８Ｌ）， ＫＩＨ＝７６．１－９．３ｌｎｃ０（３４７Ｌ）， ＫＩＨ＝９１．７－１０．１ｌｎｃ０（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．更多还原

【Abstract】 It was found that the hydrogen-induced delayed failure could occur in 308L and 347L weld metals, and the threshold stress intensities for 308L and 347L are lower than 304L austenitic stainless steel. When dynamically charged to single-edge notched specimen under load, the threshold stress intensities for 308L, 347L and 304L decrease with the increase in the diffusible hydrogen content c0 and the experimental results are as follows: KIH =85.2-10.7lnc0(308L), KIH =76.1-9.3lnc0 (347L), KIH =91.7-10.1 lnc0(304L). The modes of hydrogen-induced delayed fracture in the three materials are correlated with the KI and c0 values.更多还原