文献类型：期刊文献

中文题名：气冷堆过热器管板在热冲击循环载荷下的蠕变疲劳损伤

英文题名：Creep-Fatigue Damage of Gas-Cooled Reactor Superheater Tube Plate under Thermal Shock Cyclic Loading

作者：魏乾永[1];王骁晓[1];陈浩峰[1];彭恒[2]

机构：[1]华东理工大学机械与动力工程学院,上海200237;[2]清华大学核能与新能源技术研究院,北京100084

年份：2025

卷号：49

期号：10

起止页码：111

中文期刊名：机械工程材料

外文期刊名：Materials For Mechanical Engineering

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划项目(2023YFF0614903);国家自然科学基金资助项目(52375145);中国博士后科学基金资助项目(2023TQ0119,GZC20240467,22024M760909);上海市白玉兰人才计划浦江项目(24PJD026)。

语种：中文

中文关键词：R5规程;热冲击;过热器管板;蠕变疲劳;寿命预测

外文关键词：R5 procedure;thermal shock;superheater tube plate;creep-fatigue;life prediction

摘要：以800H奥氏体合金制成的气冷堆蒸汽过热器管板为研究对象,基于R5规程2/3分卷的弹性应力分析简化方法,结合有限元模拟,估算管板在经历冷热流体冲击后的稳态循环应力与应变,开展了蠕变-疲劳损伤分析,研究了循环载荷对管板关键位置失效行为的影响,预测了蠕变-疲劳寿命。结果表明:经历稳态保载→冷流体冲击→稳态保载→热流体冲击的单次循环过程后,管板危险点出现于管板与管箱壳壁连接处,蠕变损伤是导致管板失效的主导因素,其累积速率远高于疲劳损伤。流体冲击通过热应力的剧烈波动显著影响关键部位的应力应变响应,从而决定了蠕变-疲劳损伤的演变路径与累积效率,影响管板结构的服役寿命;在小范围温度波动工况中,冷流体冲击在直接加剧疲劳损伤的同时协同加剧蠕变损伤,强化了蠕变-疲劳交互作用,加速了结构失效;热流体冲击有利于降低塑性变形,同时抑制蠕变损伤累积,对结构的寿命影响更小。冷流体冲击的危险性显著高于热流体冲击,在需调节温度的小幅温变环境中,应优先采用热流体冲击工况。
The gas-cooled reactor steam superheater tube plate made of 800H austenitic alloy was taken as the research object.By the simplified elastic stress analysis method of volume 2/3 of the R5 procedure,combining with finite element simulation,the steady-state cyclic stress and strain of the tube plate experienced combined impact of hot and cold fluids were estimated.Creep-fatigue damage analysis was carried out,and the influence of cyclic loads on the failure behavior of key positions of the tube plate was studied.The creep-fatigue life was predicted.The results show that after one single cycle consisting of steady-state load retention→cold fluid impact→steady-state load retention→hot fluid impact processes,the critical point of the tube sheet appeared at the junction between the tube sheet and the tube box shell.Creep damage was the dominant factor leading to the failure of the tube sheet,and its cumulative rate was much higher than that of fatigue damage.The fluid impact significantly affected the stress-strain response at key positions through the intense fluctuation of thermal stress,thereby determining the evolution path and cumulative efficiency of creep-fatigue damage,and affecting the service life of the tube plate structure.Under the small temperature fluctuation condition,the cold fluid impact directly aggravated fatigue damage while simultaneously intensifying creep damage,strengthening the interaction between creep and fatigue,and accelerating structural failure.The hot fluid impact could reduce the plastic deformation and inhibited the cumulative of creep damage,having a relative small effect on the structure service life.Cold fluid impact was danger than hot fluid impact.In the small temperature variation environment that required temperature adjustment,the hot fluid impact condition should be given priority.