核电用316LN不锈钢的热机械疲劳性能研究  

Study on Thermal Mechanical Fatigue Performance of 316LN Stainless Steel

作　　者：何琨[1] 周军[1] 罗强[2] 陈勇[1] 任黎平 朱勇辉[2] 

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,成都610213 [2]中国核动力研究设计院核燃料元件及材料研究所,成都610213

出　　处：《核动力工程》2016年第4期48-52,共5页Nuclear Power Engineering

基　　金：国家科技重大专项项目(2011ZX06004-002)

摘　　要：采用热机械疲劳试验方法研究316LN不锈钢的同相热机械疲劳行为,获得材料的疲劳数据。试验结果表明：316LN不锈钢的热机械疲劳行为是一个先强化后软化的过程;滞回曲线呈梭形,形状“饱满”,具有良好的塑性变形能力,且随着温度范围增大,变形能力增强;在相同条件下,温度范围增大,材料的疲劳特征表现更为明显;在波动管运行条件下（温度≤320℃）,应变对材料的疲劳寿命影响占主要作用;材料在120～320℃和120～230℃条件下的热机械疲劳寿命均大于350℃恒温低周疲劳寿命,说明采用传统的高温低周疲劳试验结果来评价波动管材料的热机械疲劳寿命过于保守。Thermal mechanical fatigue behavior of 316LN stainless steel is studied by thermal mechanical fatigue test, the fatigue data and curve are obtained. The result shows that 316LN stainless steel has a hardening and then softening process during the whole life. The hysteresis loop is fusiform, which means a well plastic deformability. With the increasing of the temperature, the deformability is enhanced and the fatigue characteristic is more distinct. Under the operation condition of the surge line （temperature is less or equal to 320℃）, the strain has the primary effect on the fatigue life. The fatigue life under the 120-320℃ and 120-230℃ conditions is longer than the low cycle fatigue life under constant temperature 350℃, which means that the traditional test data of low cycle fatigue under high temperature is too conservative to assess the thermal mechanical fatigue life of the surge line.

关 键 词：热机械疲劳 316LN不锈钢 疲劳寿命 波动管 

分 类 号：TG142.25[一般工业技术—材料科学与工程]