摘要
某电厂超临界锅炉水冷壁管在运行过程中发生泄漏。通过宏观观察、化学成分分析、金相检验、力学性能试验、扫描电镜及能谱分析等方法对管子的泄漏原因进行了分析。结果表明:水冷壁管对接焊缝中存在结晶裂纹,该结晶裂纹在管内压应力和焊接残余应力的作用下不断扩展,形成穿透管壁的横向裂纹,最终导致水冷壁管泄漏。
The water wall tube of supercritical boiler in a power plant leaked during operation.The causes of tube leakage were analyzed by means of macroscopic observation,chemical composition analysis,metallographic examination,mechanical property test,scanning electron microscope and energy spectrum analysis.The results show that there were solidification cracks in the butt weld of water wall tube.Under the action of internal pressure stress and welding residual stress,the solidification cracks propagated continuously,formed transverse cracks through the tube wall,and finally led to the water wall tube leakage.
作者
王建国
王智春
韩哲文
杨鑫莹
宋子博
WANG Jianguo;WANG Zhichun;HAN Zhewen;YANG Xinying;SONG Zibo(North China Electric Power Research Institute Co.,Ltd.,Beijing 100045,China)
出处
《理化检验（物理分册）》
CAS
2020年第6期63-65,共3页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
关键词
水冷壁管
对接焊缝
泄漏
结晶裂纹
残余应力
water wall tube
butt weld
leakage
solidification crack
residual stress
作者简介
王建国(1987-),男,工程师,主要从事金属材料的理化检验及失效分析工作,wang_nut@163.com。
