PD_3重轨钢氢压裂纹的形核机制

金属学报, 1996, 32(8): 845-851.

PD_3重轨钢氢压裂纹的形核机制

黄一中 , 黄长河 , 王燕斌 , 褚武扬 , 梅冬生 , 程兴德 , 苏世怀 , 俞梦文

北京科技大学

关键词：ＰＤ_３重轨钢 , hydrogen bubble , hydrogen pressure microcrack

INITIATION OF HYDROGEN PRESSURE BUBBLES IN STEEL PD_3

HUANG Yizhong , HUANG Changhe , WANG Yanbin , CHU Wuyang (University of Science and Technology Beijing , Beijing 100083) , MEI Dongsheng , CHENG Xingde , SU Shihuai

Keywords： : steel PD_3 , 氢气泡 , 氢压裂纹

在透射电镜中原位观察了ＰＤ_３重轨钢氢气泡及氢压裂纹的形核过程．结果表明，充氢时先形成氢气泡，随氢压增大，周围局部屈服，但在气泡壁附近存在无位错区，其中的应力可能很高．当气泡中的氢压升高到等于被富集氢降低了的原子键合力时，氢压裂纹就在气泡壁上形核．

The initiating process of the hydrogen bubbles and microcracks caused by the hydrogen pressure was observed by TEM. The results showed that hydrogen charging can generate bubbles and then cause a great reduce of the cohesive strength. As soon as the hydrogen pressure within the bubble reaches to the cohesive strength decreased by hydrogen,microcrack will initiate at the wall of the bubbles. Correspondent: HUANG Yizhong,( Department of Materials Physics, University of Scicnce and Technology Beijing, Beijing 100083)

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