| 杨波,俞少行,井建鑫,张再经,张生金,陈吉伟.滨海发射场低温管路法兰连接螺栓环境腐蚀断裂失效机理[J].装备环境工程,2021,18(9):86-92. YANG Bo,YU Shao-xing,JING Jian-xin,ZHANG Zai-jing,ZHANG Sheng-jin,CHEN Ji-wei.Failure Mechanism of Environmental Corrosion and Fracture of Flange Connection Bolts of Low-temperature Pipelines in Coastal Launch Site[J].Equipment Environmental Engineering,2021,18(9):86-92. |
| 滨海发射场低温管路法兰连接螺栓环境腐蚀断裂失效机理 |
| Failure Mechanism of Environmental Corrosion and Fracture of Flange Connection Bolts of Low-temperature Pipelines in Coastal Launch Site |
| 投稿时间：2021-05-03 修订日期：2021-06-03 |
| DOI：10.7643/issn.1672-9242.2021.09.013 |
| 中文关键词: 低温管路 盐雾腐蚀 连接螺栓 应力腐蚀 |
| 英文关键词:low temperature pipeline salt spray corrosion connecting bolt stress corrosion |
| 基金项目: |
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| Author | Institution |
| YANG Bo | China Wenchang Space Launch Site, Wenchang 571300, China;Key Laboratory of Reliability Technology for Space Launch Site, Haikou 570100, China |
| YU Shao-xing | China Wenchang Space Launch Site, Wenchang 571300, China;Key Laboratory of Reliability Technology for Space Launch Site, Haikou 570100, China |
| JING Jian-xin | China Wenchang Space Launch Site, Wenchang 571300, China |
| ZHANG Zai-jing | China Wenchang Space Launch Site, Wenchang 571300, China |
| ZHANG Sheng-jin | China Wenchang Space Launch Site, Wenchang 571300, China |
| CHEN Ji-wei | China Wenchang Space Launch Site, Wenchang 571300, China |
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| 中文摘要: |
| 针对滨海发射场用于低温管路法兰连接的高强度螺栓的环境腐蚀断裂问题进行失效机理分析。结合螺栓所处“高温、高湿、高盐雾”环境及低温高压工况，讨论分析了盐雾腐蚀、应力作用、微观形貌、化学成分及硬度等影响因素。结果表明，螺栓显微硬度均值(108HRB)超标，材质中C、S、Cr含量异常，螺栓实际受力达到许用应力的60%以上，微观组织裂纹均为典型的应力腐蚀裂纹。在海南“三高”海洋腐蚀环境影响下，耐腐蚀性能较差的螺栓在热应力作用下萌生裂纹，产生应力腐蚀，在热应力和拉应力的作用下进行扩展，发生应力腐蚀开裂，螺栓延迟脆性断裂导致失效。最后，针对螺栓应力腐蚀机理，提出了相应的改进措施。 |
| 英文摘要: |
| This paper analyzes the failure mechanism of the environmental corrosion and fracture problem of the high- strength bolts used for the flange connection of the low-temperature pipeline at the coastal launch site, and discusses the influence factors of salt spray corrosion, stress effect, microscopic morphology, chemical composition and hardness combining the “high temperature, high humidity, high salt spray” environment and the low temperature and high pressure working conditions of the bolt. The results of the study found that:the average value of bolt microhardness (108HRB) exceeded the standard; the content of C, S, and Cr in the material was abnormal; the actual force of the bolt reached more than 60% of the allowable stress; the microstructure cracks were all typical stress corrosion cracks. The failure mechanism of bolts was:under the influence of Hainan’s “three highs” marine corrosion environment, the bolts with poor corrosion resistance initiated cracks under the action of thermal stress, resulting in stress corrosion, and expanded under the action of thermal and tensile stress, invalid due to stress corrosion cracking and bolts delay brittle fracture. Finally, corresponding improvement measures are proposed for the bolt stress corrosion mechanism. |
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