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| Failure Analysis of Fracture of Engine Cylinder Block |
| Received:March 05, 2017 Revised:August 15, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2017.08.011 |
| KeyWord:engine cylinder block fracture hot cracking |
| Author | Institution |
| WANG Wan |
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 |
| MEI Hua-sheng |
1.Southwest Technology and Engineering Research Institute, Chongqing , China;2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
| HE Ming-qiang |
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 reasons for fracture of engine cylinder block. Methods Fracture modes and the failure reasons were analyzed by chemical composition analysis, mechanical performance analysis, SEM analysis, microstructure, energy dispersive spectrum analysis and low magnification defect analysis. Results There were two reasons that greatly reduced the inter-granular binding force, one was caused by lots of brittle phases of Al2Cu and AlSiCu distributing along with the grain-interface which induced by excessive Si, and the other was superheating and over-firing microstructure in the cracking area. At the same time, there was hot section effect in the cracked area, and the low porosity and shrinkage cavity were concentrated, which provided favorable conditions for the formation and the continued expansion of hot crack. Conclusions The probability of hot cracking is greatly reduced by improving the process design, controlling raw material composition and adjusting casting parameters. There is no similar failure specimen in the post production. |
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