文献类型：期刊文献

中文题名：反应堆压力容器材料压缩蠕变性能及变形机制研究

英文题名：Compressive creep behavior and deformation mechanism of the material in reactor pressure vessel

作者：陶贤超[1];高永建[2];赵鹏[1];胡靖东[2];宫建国[1];轩福贞[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237;[2]上海核工程研究设计院有限公司,上海200233

年份：2022

卷号：39

期号：7

起止页码：1

中文期刊名：压力容器

外文期刊名：Pressure Vessel Technology

收录：CSTPCD;;北大核心:【北大核心2020】；

基金：国家科技重大专项资助项目(2018ZX06002004)。

语种：中文

中文关键词：反应堆压力容器;压缩蠕变;变形机制;位错攀移;空位扩散

外文关键词：reactor pressure vessel;compressive creep;deformation mechanism;dislocation climbing;vacancy diffusion

摘要：严重事故工况下,反应堆压力容器底封头内侧区域承载高温、压缩应力的共同作用,其压缩蠕变行为及微观变形机制是需要考虑的重要内容。基于此,开展了不同温度(600,700℃)、应力条件下SA-508材料的压缩蠕变试验,结合微观表征手段,分析了材料的压缩蠕变变形机制。结果表明,压缩蠕变曲线表现为两阶段特征,未出现蠕变加速阶段;600℃时,随着应力水平的不断降低,压缩蠕变变形机制由位错攀移转变为晶界滑动/空位扩散;700℃时,在所分析应力范围内,蠕变变形机制为位错攀移。
Under severe accident, the inner area of the bottom head of the reactor pressure vessel is subjected to the combined action of high temperature and compressive stress, and the compressive creep behavior and microscopic deformation mechanism are important issues to be considered.Based on this, compressive creep tests of SA-508 steel under different temperature(600 and 700 ℃) and stress conditions were carried out, and the deformation mechanism of the material was analyzed by microscopic observations.The results show that the compressive creep curve exhibits two-stage characteristics, and the creep acceleration stage is not observed.At 600 ℃,the compressive creep deformation mechanism changes from dislocation climbing to grain boundary sliding/vacancy diffusion with the continuous decrease of stress level.At 700 ℃,the creep deformation mechanism is dislocation climbing for the range of stress levels considered.