原子能科学技术2017，Vol.51Issue(10)：1846-1852,7.DOI:10.7538/yzk.2017.youxian.0059
国产316LN不锈钢在模拟AP1000一回路水环境中的疲劳行为
Fatigue Behavior of Domestic 316LN Stainless Steel under Simulated AP1000 Primary Coolant Environment
摘要
Abstract
Fatigue is the key parameter of nuclear power plant (NPP)primary coolant pipe design life assessment.In this paper,the fatigue of domestic 316LN stainless steel, which is used for AP1000 NPP main pipe,was test under simulated primary coolant environment,then the fatigue behavior and the fracture mechanism were analyzed.The results show that the peak stress increases with the strain amplitude;the large strain amplitude specimens exhibit cyclic hardening,cyclic softening and instability behavior, while the low strain amplitude specimens show neither hardening nor softening behavior before instability;the fatigue life of domestic 316LN decreases from 105 to 102 ,as the strain amplitude increases from 0.2% to 1.2%.The fatigue crack initiates at the speci- men surface,propagates on the direction perpendicular to the principal stress through transgranular manner,and leaves typical fatigue striations.A lot of rhombus corrosion products are found on the striation,and the environment assist crack mechanism is apt to hydrogen-induced cracking mechanism.关键词
一回路主管道/一回路水/低周疲劳/316LN/腐蚀疲劳Key words
primary coolant pipe/primary coolant/low cycle fatigue/316LN/corrosion fatigue分类
能源科技引用本文复制引用
钟巍华,佟振峰,王成龙,王正,李金许,杨文..国产316LN不锈钢在模拟AP1000一回路水环境中的疲劳行为[J].原子能科学技术,2017,51(10):1846-1852,7.基金项目
大型先进压水堆核电站国家科技重大专项资助(2012ZX06004-012) （2012ZX06004-012）
