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作 者:陶贤超 高永建 赵鹏 胡靖东 宫建国[1] 轩福贞[1] TAO Xianchao;GAO Yongjian;ZHAO Peng;HU Jingdong;GONG Jianguo;XUAN Fuzhen(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd.,Shanghai 200233,China)
机构地区:[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
出 处:《压力容器》2022年第7期1-6,14,共7页Pressure Vessel Technology
基 金:国家科技重大专项资助项目(2018ZX06002004)。
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.
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
分 类 号:TH49[机械工程—机械制造及自动化] TG111.8[金属学及工艺—物理冶金]
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