摘要
我国将陆续开工建设一批CPR、AP1000和EPR等堆型的百万等级核电站,而核电汽轮机主要部件工作在湿蒸汽环境下,防止这些部件产生应力腐蚀裂纹甚至导致最终断裂是汽轮机的关键设计。本文介绍了应力腐蚀的机理,并说明了汽轮机部件应力腐蚀的3个重要影响因素:材料的屈服强度、工作应力水平和工作环境,从可能产生应力腐蚀部位的应力限制和对应力腐蚀裂纹增长的控制方面,提出如何从设计上防止这些部件因为应力腐蚀而失效的措施,这些措施有效性已经在国外的核电站运行中得到了验证,为叶轮、叶片、汽缸等关键部件长期安全运行提供可靠的技术保证。
An amount of CPR,AP1000 and EPR type／＇s nuclear power plants are to be built in China.As the principal components of nuclear steam turbine working in saturated steam conditions,it is essential for turbine design to avoid initiation and growth of stress corrosion cracking（SCC） which may finally lead to components／＇rupture.This article introduces the mechanism of stress corrosion,indicates three factors influencing the SCC behavior-yield strength of material,working stress and environment.Through limiting the working stress of SCC possible position and controlling the SCC growth,the design measures how to avoid components failure due to SCC are put forward.Having been validated in oversea nuclear power plants operation,these measures can supply technical guarantees for key components such as disc,blade and cylinder.
出处
《热力透平》
2010年第2期89-92,96,共5页
Thermal Turbine
关键词
核电汽轮机
湿蒸汽环境
应力腐蚀裂纹
裂纹扩展速度
屈服强度
应力强度因子
nuclear steam turbine
saturated steam conditions
stress corrosion cracking（SCC）
crack growth rate
yield strength
stress intensity factor
