明卫平,张怡悦,王传志,许元,刘欣芳,熊金平.不锈钢截止阀波纹管组件腐蚀开裂失效分析[J].表面技术,2016,45(2):28-33.
MING Wei-ping,ZHANG Yi-yue,WANG Chuan-zhi,XU Yuan,LIU Xin-fang,XIONG Jin-ping.Failure Analysis of Corrosion Cracking of Bellows Subassembly in Stainless Steel Sealed Valves[J].Surface Technology,2016,45(2):28-33 |
| 不锈钢截止阀波纹管组件腐蚀开裂失效分析 |
| Failure Analysis of Corrosion Cracking of Bellows Subassembly in Stainless Steel Sealed Valves |
| 投稿时间：2015-10-31 修订日期：2016-02-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.02.005 |
| 中文关键词: 不锈钢 失效分析 波纹管组件 导热油 应力腐蚀开裂 平面失稳 韧性断裂 |
| 英文关键词:stainless steel failure analysis bellows subassembly HTF stress corrosion cracking plane instability ductile fracture |
| 基金项目: |
| 作者 | 单位 |
| 明卫平 | 1. 北京化工大学 碳纤维与功能高分子教育部重点实验室, 北京 100029;2. 北京化工大学 材料电化学过程与技术实验室, 北京 100029 |
| 张怡悦 | 北京科技大学 土木与环境工程学院, 北京 100083 |
| 王传志 | 1. 北京化工大学 碳纤维与功能高分子教育部重点实验室, 北京 100029;2. 北京化工大学 材料电化学过程与技术实验室, 北京 100029 |
| 许元 | 1. 北京化工大学 碳纤维与功能高分子教育部重点实验室, 北京 100029;2. 北京化工大学 材料电化学过程与技术实验室, 北京 100029 |
| 刘欣芳 | 1. 北京化工大学 碳纤维与功能高分子教育部重点实验室, 北京 100029;2. 北京化工大学 材料电化学过程与技术实验室, 北京 100029 |
| 熊金平 | 1. 北京化工大学 碳纤维与功能高分子教育部重点实验室, 北京 100029;2. 北京化工大学 材料电化学过程与技术实验室, 北京 100029 |
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| Author | Institution |
| MING Wei-ping | 1. Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China; 2. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China; |
| ZHANG Yi-yue | School of Civil and Environmental Engineering,University of Science & Technology Beijing, Beijing 100083, China |
| WANG Chuan-zhi | 1. Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China; 2. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China; |
| XU Yuan | 1. Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China; 2. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China; |
| LIU Xin-fang | 1. Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China; 2. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China; |
| XIONG Jin-ping | 1. Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China; 2. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China; |
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| 中文摘要: |
| 目的 针对某炼油厂波纹管截止阀中双层不锈钢 304 波纹管组件发生开裂,造成截止阀失效的现况,通过失效分析,寻找腐蚀开裂的原因。 方法 对失效开裂的不锈钢截止阀双层波纹管组件进行外观检查,采用金相显微镜和直读光谱仪分别对失效组件的金相组织和化学成分进行分析,用电子显微镜观察组件断口形貌与特征。 结果 波纹管组件外层管壁断口上可以观察到解理面和解理台阶,并且能看到腐蚀产物的存在,这是奥氏体不锈钢发生应力腐蚀断裂的典型特征;内层管壁断口上有韧窝存在,属于机械断裂。 金相组织和化学成分分析表明,波纹管组件使用的不锈钢材质合乎设计与使用要求。 导热油介质检测结果显示,导热油中含氯 55 mg/ kg, 总硫含量 350 mg/ kg,有害离子含量较高。 结论 双层波纹管组件的内层管壁和外层管壁的失效机制不同:外层管壁是由 Cl-导致的应力腐蚀开裂;内层管壁是由于外层管壁失效引起波纹管组件失稳,造成抗压强度和寿命急剧降低,在应力的作用下出现韧性断裂。 建议降低导热油中有害离子含量,使用耐蚀性更好的材质。 |
| 英文摘要: |
| Objective To find out the causes for corrosion cracks by failure analysis in the condition that the bellows subassembly made of 06Cr19Ni10 stainless steel in the sealed valves cracked which resulted in the failure of sealed valves. Methods The appearance of the failed bellows subassembly was examined by naked eyes, the metallographic structure and the chemical components were analyzed respectively by the metallographic microscope and direct reading spectrometer; the morphology and fracture of the failed subassembly were observed by SEM. Results Cleavage plane, cleavage steps and corrosion products were seen on the fracture of the outer wall, which was the typical feature for stress corrosion cracking of austenitic stainless steel. Some dimples were observed on the inner wall fracture, which indicated that the inner wall had ductile fracture. The analysis showed that the quality of microstructure and chemical composition of the bellows subassembly met the requirements on design and usage. The medium test results showed that the content of harmful ions was relatively high in the heat transfer fluid (HTF) which contained 55 mg / kg chloride ion and over 350 mg / kg sulfur. Conclusion The main fracture causes of outer and inner wall of the double-layer bellows subassembly were different; the failure of outer wall was due to the stress corrosion related to the high content of chloride ion, while the fracture of inner wall was ductile fracture,which was due to the significant decrease in compressive strength in the result of the plane instability cause by the failure of outer wall. It is proposed that the content of harmful ions should be reduced in HTF and the stainless steel with better corrosion resistance should be used. |
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