| 大型锻造法兰脆性开裂原因分析 |
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| 引用本文： | 付饶,杜风贞,武志勇.大型锻造法兰脆性开裂原因分析[J].失效分析与预防,2012(4):257-261. |
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| 作者姓名： | 付饶 杜风贞 武志勇 |
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| 作者单位： | [1]中国船级社,北京100006 [2]国家有色金属质量监督检验中心,北京100088 [3]中石油管道建设项目经理部,北京100101 |
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| 摘 要： | 通过断口观察、化学成分分析、金相组织检查、硬度检测、拉伸及冲击试验等方法,对某大型锻造法兰脆性断裂原因进行了分析。结果表明:粗大的魏氏体组织是造成法兰发生脆性断裂的直接原因,阐述了粗大组织对法兰脆性断裂的影响机制;证明了这种组织缺陷与热处理时工件过热有关,可通过正确的正火工艺来消除,并且采用了正确的热处理工艺,材料的冲击功提高了2个数量级,解决了锻造法兰的脆性问题。
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| 关 键 词： | 法兰 失效分析 过热 低温脆断 魏氏组织 |
Failure Analysis of Large Forged Flange |
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| FU Rao,DU Feng-zhen,WU Zhi-yong.Failure Analysis of Large Forged Flange[J].Failure Analysis and Prevention,2012(4):257-261. |
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| Authors: | FU Rao DU Feng-zhen WU Zhi-yong |
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| Affiliation: | 1. China Classification Society, Beijing 100006, China; 2. Nationa! Quality Supervision and Inspection center For Non-ferrous Metals, Beijing 100088, China; 3. Pipeline Construction Administration Department CNPC , Beijing 100101, China) |
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| Abstract: | Failure analysis of a large forged flange was carried out by fracture observation, chemical composition analysis, metallurgical examination, hardness test, tensile test and impact test. The results show that coarse Widmanstatten structure is the direct cause of the flange brittle fracture. The effect mechanism of the coarse structure on brittle fracture was explained. This metallurgical defect was proved to be related to overheating in the final heat treatment process of flange and can be eliminated by appropriate normalizing process. Correct heat treatment process was adopted. And the impact energy of the material was improved by two orders of magnitude. Finally, the brittleness of the forged flange was solved. |
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| Keywords: | flange failure analysis overheating low temperature brittle fracture widmanstaten structure |
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