摘要
高温持久强度试验和微观结构分析显示,某热电厂材质为F12(X20CrMoV12.1)主蒸汽管道经1.65×105h运行后,材料的力学性能和组织结构产生明显的退化或损伤.尽管没有发现蠕变空洞或裂纹等动态缺陷,但微观结构表现出明显的脆化倾向和蠕变损伤特征,弯管部分尤为显著.服役材料的持久强度试验结果和主蒸汽管线运行状态下的有限元方法应力计算分析表明,该主蒸汽管道的再设计许用应力值已不能满足继续安全运行1×105h的基本条件.最后对其剩余使用寿命做出评价.
The health assessment of an exposed main steam pipe of X20CrMoV12. 1（F12） in a thermal power plant was made by accelerated stress rupture and tensile tests and microstructure examinations. exhibits the characteristics of granule boundary weakening and creep damage, but no evidence of localized damage in the form of cavitation or surface crack was found, the results of accelerated stress rupture tests and stress analysis by finite element method show that this steam pipe, from re-design viewpoint, is not safe in operation for next 100 000 hours under normal service condition, and its residual life is assessed from the results as well.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第1期86-91,共6页
Journal of Tongji University:Natural Science
关键词
主蒸汽管道
有限元分析
剩余寿命
热损失
微观结构
main steam pipe
finite element method
residual life
heat damage
microstructure
