通过模拟核电高温高压循环水腐蚀疲劳实验, 研究了国产核级不锈钢的环境疲劳损伤行为与失效机制; 评价了影响不锈钢高温高压水疲劳寿命的环境和载荷等因素, 建立了一个植入环境损伤效应的疲劳设计模型, 给出了便于工程应用的核级不锈钢的环境疲劳设计曲线.
The high safety of light water reactor nuclear power plants (NPPs) requires very strict design standard and service property of pressure boundary components materials. The service degradation and life assessment of the components materials primarily depend on the understanding of environmentally assisted failure mechanism, accumulation of service property data and construction of evaluation models. Currently domestic NPPs are relying on foreign design, operation and life assessment standards. However, recent experimental data indicate that even the ASME design fatigue code may be deficient in safety margin under certain conditions of loading and environment. In the present work, based on the corrosion fatigue tests in simulated NPPs' high temperature pressurized water, the corrosion fatigue behavior and environmentally assisted failure mechanism of domestic nuclear-grade stainless steel have been investigated. The factors affecting fatigue life of nuclear grade stainless steel in high temperature water were evaluated. A design fatigue model was constructed by taking environmental degradation effects into account and the corresponding design curves were given for the convenience of engineering applications.
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