摘要
电站在进行汽轮机试验时一根凝汽器钛管发生断裂。通过采取表面宏观检查、断口分析、材质检查等方法,对钛管断裂原因进行分析,并提出改进方案。结果表明:钛管的断裂性质为高周疲劳断裂,疲劳源位于钛管的焊缝位置;钛管断裂与蒸汽冲刷导致钛管振幅过大有关,从而在疲劳性能相对较差的焊缝处萌生裂纹源。通过增加防冲板的方式,可以有效避免类似故障。
A titanium tube of condenser in power station fractured during steam turbine test.In order to find out the fracture mode and cause,macro examination,SEM analysis and material examination were carried out.The test results show that the fracture mode was high-cycle fatigue fracture,and the crack initiated from the weld of the titanium tube.The fracture of the titanium tube was related to the excessive amplitude caused by steam impact.Similar failures can be effectively avoided by installing the protection plate.
作者
巩秀芳
王天剑
刘昌奎
王芬玲
裴玉冰
GONG Xiu-fang;WANG Tian-jian;LIU Chang-kui;WANG Fen-ling;PEI Yu-bing(Dongfang Turbine Co.,Ltd.,Material Research Center,Sichuan Deyang 618000,China;State Key Laboratory of Long-Life High Temperature Materials,Sichuan Deyang 618000,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《失效分析与预防》
2019年第4期284-287,共4页
Failure Analysis and Prevention
关键词
凝汽器钛管
疲劳断裂
蒸汽冲刷
振幅过大
防冲板
condenser titanium tube
fatigue fracture
steam impact
excessive amplitude
protection plate