摘要
采用宏观形貌、金相组织和断口观察以及成分分析和力学性能测定等方法,分析了某20钢高温输水管爆裂的原因.结果表明,断裂失效发生在焊缝部位,焊缝组织存在明显蠕变现象,断口起裂处具有典型脆性断裂特征,裂纹内有腐蚀产物,属于典型应力腐蚀裂纹.裂纹扩展后期近外表面处具有蠕变疲劳裂纹特征.应力腐蚀裂纹是该热水管爆裂失效的主要原因.
The failure analysis for hot water pipes of 20 steel was performed by means of examinations of macro-morphology, metallograph and fractured surface, as well as chemical analysis and mechanical property measurement for the relevant materials. Results showed that the fracture occurred in the weld joints with obvious deterioration in weld area due to creep. The fracture initiated and propagated with typical brittle characteristics. The occurrence of corrosion products on cracking wall and in the cracking tip revealed that stress corrosion cracking （SCC） was the dominant factor of the pipe burst. Creep crack and fatigue characteristics were also found on the fracture, which accelerated the SCC and pipe burst.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2013年第1期30-34,共5页
Corrosion Science and Protection Technology
基金
国家自然科学基金(50901041和51131001)
中国博士后基金(20100480196)资助
关键词
20钢
焊缝
热水管
应力腐蚀
爆裂
20 steel, weld joint, hot-water pipe, SCC, burst
