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| Study on Behaviors of Hydrogen-induced Fracture of Precipitation Strengthened Austenitic Alloy |
| Zhongwen，ZhAO Mingjiu，RONG Lijian |
| Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
Zhongwen ZhAO Mingjiu RONG Lijian. Study on Behaviors of Hydrogen-induced Fracture of Precipitation Strengthened Austenitic Alloy. Chin J Mater Res, 2012, 26(2): 113-118.
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Abstract Correlation of hydrogen embritt/ement sensitivity and fracture behavior was investigated by means of tensile tests and fractographic examination in a precipitation strengthened austenitic alloy with and without hydrogen. Additionally, slip bands during tensile deformation were observed in order to determine the effect of hydrogen on localized plasticity and microcrack nucleation. The results show that the fracture mode of the precipitation strengthened austenitic alloy exhibits dramatic transition from dimple fracture in uncharged specimens to the mixed mode with dimple, intergranular and slip band fracture in charged specimens. As for the reason, it can be related to not only the slip planarity and localization induced by hydrogen but also the dislocation pile-up and hydrogen accumulation formed at the sites of grain boundaries, twin boundaries and intersecting slip bands.
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Received: 13 January 2012
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| Fund: Supported by National Nature Science Foundation of China No.51171178. |
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