| 刘润,刘俊建,王万里,吴跃,王严,汤文明.服役态Super304H耐热钢管显微组织演变及高温力学性能研究[J].装备环境工程,2022,19(12):120-126. LIU Run,LIU Jun-jian,WANG Wan-li,WU Yue,WANG Yan,TANG Wen-ming.Microstructural Evolution and High-temperature Mechanical Properties of In-service Super304H Heat-resistant Steel Tube[J].Equipment Environmental Engineering,2022,19(12):120-126. |
| 服役态Super304H耐热钢管显微组织演变及高温力学性能研究 |
| Microstructural Evolution and High-temperature Mechanical Properties of In-service Super304H Heat-resistant Steel Tube |
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| DOI：10.7643/issn.1672-9242.2022.12.017 |
| 中文关键词: 超超临界机组 Super304H钢管 晶粒尺寸 第二相 显微组织演变 高温力学性能中图分类号:TG142.1 文献标识码:A 文章编号:1672-9242(2022)12-0120-07 |
| 英文关键词:ultra-supercritical unit Super304h steel tube grain size secondary phase microstructural evolution high-temperature mechanical property |
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| Author | Institution |
| LIU Run | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
| LIU Jun-jian | Datang Boiler and Pressure Vessel Testing Center Co., Ltd., Hefei 230088, China;Datang East China Electric Power Test and Research Institute, Hefei 230088, China |
| WANG Wan-li | Datang Boiler and Pressure Vessel Testing Center Co., Ltd., Hefei 230088, China |
| WU Yue | Datang Boiler and Pressure Vessel Testing Center Co., Ltd., Hefei 230088, China;Datang East China Electric Power Test and Research Institute, Hefei 230088, China |
| WANG Yan | Datang Boiler and Pressure Vessel Testing Center Co., Ltd., Hefei 230088, China |
| TANG Wen-ming | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
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| 中文摘要: |
| 目的 探究服役Super304H钢管外壁粗晶组织演变及其对高温力学性能的影响，为超超临界机组运行管理与安全评估提供技术支持。方法 针对不同服役时间的Super304H耐热钢管，开展显微组织演变及650 ℃高温拉伸力学性能研究，着重探讨钢管外壁奥氏体晶粒异常长大、第二相析出长大及其对钢管高温力学性能的影响规律。结果 服役态Super304H钢管中的第二相以富铜相、MX相及M23C6相为主，其外壁奥氏体晶粒异常长大，形成粗晶区，而靠近内壁钢管中的奥氏体晶粒长大不明显，为细晶区。相对于细晶区，粗晶区奥氏体晶界及晶内析出更多的第二相，尺寸更大，弥散度降低，导致粗晶区高温拉伸性能显著降低。结论 长期高温运行的Super304H耐热钢管应加强监督，消除因外壁奥氏体晶粒异常长大而带来的胀管等安全隐患。 |
| 英文摘要: |
| The work aims to explore the effects of microstructural evolution of outer-wall coarse grain zone of the in-service Super304H steel tube and the effects on its high-temperature mechanical properties, to provide technical support for operation management and safety assessment of the ultra-supercritical units. The microstructure and the tensile mechanical properties of the in-service Super304H heat resisting steel tube of different service duration were studied to discuss the austenite grain abnormal growth and secondary phase precipitation of the outer wall and its effects on the high-temperature mechanical properties of the steel tube. The results showed that the secondary phases in the in-service Super304H steel tube were mainly composed of the copper-rich phase, MX and M23C6. The austenite grains of the outer wall grew abnormally to form the coarse grain zone, while the grains near the inner wall of the steel tube grew slowly to form the fine grain zone. Compared with the fine grain zone, more secondary phases of a higher size and a lower dispersion degree were precipitated in the austenite grains and along the austenite grain boundaries in the coarse grain zone, leading to a significant decrease in the high-temperature tensile properties. Therefore, a strict metal supervision is required for Super304H heat resisting steel tube in long term operation at high temperature to eliminate the potential safety risk due to abnormal growth of the austenite grains in the outer wall. |
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