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| Fracture Failure of 51CrV4 Ring Band |
| Received:October 05, 2017 Revised:March 15, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.03.018 |
| KeyWord:51CrV4 ring band fracture SCC |
| Author | Institution |
| ZHANG Kai |
1.Southwest Technology and Engineering Research Institute, Chongqing , China; 2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
| WANG Chang-peng |
1.Southwest Technology and Engineering Research Institute, Chongqing , China; 2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
| SHE Zu-xin |
1.Southwest Technology and Engineering Research Institute, Chongqing , China; 2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
| WEN Bang-wei |
1.Southwest Technology and Engineering Research Institute, Chongqing , China; 2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
| TAN Yong |
1.Southwest Technology and Engineering Research Institute, Chongqing , China; 2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
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| Abstract: |
| Objective To investigate the fracture reasons of 51CrV4 ring band. Methods The fracture modes and the failure reasons of 51CrV4 ring band were analyzed by means of chemical composition analysis, mechanical performance analysis, SEM analysis, microstructure and energy dispersive spectrum analysis. Results In the tension stress state for a long time, the initiation cracks were formed at inner surface edge of the 51CrV4 ring band. At the same time, under the synergy of corrosive medium and stress, the corrosion process was accelerated by S, corrosion product was accumulated, and the expansion of corrosion microcracks was accelerated, the SCC failure was caused finally. Conclusion The occurrence probability of SCC cracking could be greatly reduced by selecting material reasonably, improving the process design and protection technology, controlling raw material composition and reducing stress level and environmental severity. |
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