| 王莞,王长朋,梅华生,贺明强.发动机缸体开裂失效分析[J].装备环境工程,2017,14(8):55-59. WANG Wan,WANG Chang-peng,MEI Hua-sheng,HE Ming-qiang.Failure Analysis of Fracture of Engine Cylinder Block[J].Equipment Environmental Engineering,2017,14(8):55-59. |
| 发动机缸体开裂失效分析 |
| Failure Analysis of Fracture of Engine Cylinder Block |
| 投稿时间：2017-03-05 修订日期：2017-08-15 |
| DOI：10.7643/issn.1672-9242.2017.08.011 |
| 中文关键词: 发动机缸体 开裂 热裂纹 |
| 英文关键词:engine cylinder block fracture hot cracking |
| 基金项目: |
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| Author | Institution |
| WANG Wan | 1.Southwest Technology and Engineering Research Institute, Chongqing 400039, China;2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing 400039, China |
| WANG Chang-peng | 1.Southwest Technology and Engineering Research Institute, Chongqing 400039, China;2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing 400039, China |
| MEI Hua-sheng | 1.Southwest Technology and Engineering Research Institute, Chongqing 400039, China;2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing 400039, China |
| HE Ming-qiang | 1.Southwest Technology and Engineering Research Institute, Chongqing 400039, China;2.Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing 400039, China |
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| 中文摘要: |
| 目的 研究发动机缸体出现开裂失效原因。方法 通过化学成分分析、力学性能分析、断口扫描分析、显微组织分析、能谱分析及低倍缺陷分析测试手段，对发动机缸体的开裂模式及失效原因进行分析。结果 发动机缸体原材料中Si元素超标，导致晶界析出较多的AlSiCu及Al2Cu脆性相，在开裂区域组织存在过热过烧现象，两个原因导致组织晶间结合力大大降低。同时，在开裂区域存在热节效应，低倍疏松和缩孔较集中的现象，为热裂纹形成及继续扩展提供了有利条件。结论 通过不断改进设计工艺，控制原材料成分及调节浇注参数，大大减小了热裂纹出现概率，在后序批量生产中，未发现类似失效样件。 |
| 英文摘要: |
| 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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