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储油球罐底部脱水管断裂失效分析

Journal of Liaoning University of Technology(Natural Science Edition)(2013)

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Abstract
储油球罐在服役过程中其底部脱水管突然沿焊道发生了断裂。采用宏观、金相及硬度检验等方法对断裂原因进行了分析,结果是由于焊接工艺不当,在焊缝热影响区形成了粗大而硬脆的马氏体条带,焊后亦未及时退火处理。在焊接应力及工作应力作用下,致使焊缝淬硬区产生应力集中断裂。过多的夹杂物和寒冷的服役环境促进了断裂的进程。
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stress concentration fracture,weld,HAZ,martensite,dehydration tube of spherical tank
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