国产1000MW超超临界机组水冷壁管典型横向裂纹分析  

Study on Typical Transverse Crack of Water Wall Tube of 1000MW Domestic Ultra-supercritical Units

作　　者：殷尊[1] 蔡晖[1] 侯召堂[1] 张红军[1] 刘鸿国 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]神华福建能源有限责任公司,福建福州350005

出　　处：《材料科学与工程学报》2015年第3期442-447,共6页Journal of Materials Science and Engineering

基　　金：华能国际660兆瓦高效超超临界燃煤机组应用技术研究资助项目(TN-14-HNK01)

摘　　要：对国产1000MW超超临界燃煤机组水冷壁管普遍存在的横向裂纹进行分析研究,通过割取典型管样进行磁粉检测、显微组织分析、硬度试验、扫描电镜能谱分析、拉伸性能试验和断口分析,结果表明该锅炉水冷壁管表面横向裂纹是轴向交变应力作用下产生的热疲劳裂纹,腐蚀介质的存在加速了热疲劳裂纹的扩展。为防止此类失效问题,建议相关电厂采取了有效的针对性防范措施,同时对其它超超临界机组水冷壁管的安全运行提供技术参考。Typical transverse crack of water wall tube of the 1000 MW domestic ultra-supercritical units was studied by means of magnetic particle testing,microstructure analysis,hardness testing,scanning electron microscopy（SEM）,EDS analysis,tensile tests and fracture analysis.The results show that the surface transverse cracks of water wall tube are thermal fatigue cracks under axial alternating stress and the presence of corrosive media accelerates the thermal fatigue cracks.To prevent such failures,it is suggested that relevant plants take effective,targeted and preventive measures,and provide technical reference for water wall tube safe operation of other ultra-supercritical units.

关 键 词：水冷壁管 横向裂纹 腐蚀介质 热疲劳 防范措施 

分 类 号：TG115[金属学及工艺—物理冶金]