核级SA-508 Gr.3 Cl.1材料拉伸与压缩蠕变行为的比较研究

doi:10.3901/JME.2023.04.096

机械工程学报 ›› 2023, Vol. 59 ›› Issue (4): 96-104.doi: 10.3901/JME.2023.04.096

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核级SA-508 Gr.3 Cl.1材料拉伸与压缩蠕变行为的比较研究

牛田野¹, 高永建², 陶贤超¹, 赵鹏¹, 宫建国¹, 轩福贞¹

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

收稿日期:2022-02-24 修回日期:2022-06-16 出版日期:2023-02-20 发布日期:2023-04-24
通讯作者: 宫建国(通信作者),男,1988年出生,博士,副教授。主要研究方向为高温强度设计理论与方法。E-mail:jggong@ecust.edu.cn
作者简介:牛田野,男,1993年出生,博士研究生。主要研究方向为高温结构完整性。E-mail:niu_ty@163.com
基金资助:
国家科技重大专项资助项目(2018ZX06002004)。

Comparison of Tensile and Compressive Creep Behavior of SA-508 Gr.3 Cl.1 Steel for Nuclear Applications

NIU Tianye¹, GAO Yongjian², TAO Xianchao¹, ZHAO Peng¹, GONG Jianguo¹, XUAN Fuzhen¹

1. School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237;
2. Shanghai Nuclear Engineering Research and Design Institute Co., Ltd., Shanghai 200233

Received:2022-02-24 Revised:2022-06-16 Online:2023-02-20 Published:2023-04-24

摘要/Abstract

摘要： 堆芯熔融物堆内滞留(In-vessel retention, IVR)是压水堆的严重事故缓解措施。IVR过程中，反应堆压力容器底封头(Reactor pressure vessels, RPV)沿壁厚方向同时存在拉伸和压缩应力。为保证IVR过程中RPV的结构完整性，有必要研究SA-508 Gr.3 Cl.1材料的拉伸和压缩蠕变行为及其差异。基于此，开展了SA-508 Gr.3 Cl.1材料的拉伸蠕变和压缩蠕变试验测试，分析了材料的拉伸和压缩蠕变行为以及变形机制的不同。结果表明：拉伸和压缩蠕变的第一、二阶段基本吻合，但压缩蠕变没有出现明显的蠕变第三阶段；拉伸蠕变在试验应力范围内的变形机制为单一的位错攀移，而随着应力的降低，压缩蠕变变形机制由位错攀移转变为晶界滑移/空位扩散；拉伸蠕变对亚晶组织演化程度的影响大于压缩蠕变，这可能与蠕变变形机制的转变相关。

关键词: IVR, 拉伸蠕变, 压缩蠕变, 蠕变变形机制, 亚晶结构

Abstract: The In-vessel retention (IVR) is an important mitigation strategy in severe nuclear accidents. During IVR conditions, the tensile and compressive stress states both exist along the thickness direction of the reactor pressure vessels (RPV). Therefore, the tensile and compressive creep behavior of the SA-508 Gr.3 Cl.1 steel should be discussed to guarantee the structure integrity of the RPV in IVR conditions. Based on this, tensile and compressive creep tests of the SA-508 Gr.3 Cl.1 steel are conducted, and the differences of creep behavior and creep deformation mechanism between tensile and compressive creep are analyzed. Results indicate that the primary and secondary creep regimes of the compressive creep are consistent with that of the tensile creep, while the tertiary creep stage is not observed for compressive creep test. The dominant creep deformation mechanism for tensile creep is dislocation climb within the stress levels studied, while that for the compressive creep changes from dislocation climb to grain boundary sliding or vacancy diffusion with the decrease of the stress. The tensile creep plays a more important role on the evolution of the sub-grain than the compressive creep, which may be induced by the transformation of creep deformation mechanism.

Key words: IVR, tensile creep, compressive creep, creep deformation mechanism, sub-grain

中图分类号:

TG111

牛田野, 高永建, 陶贤超, 赵鹏, 宫建国, 轩福贞. 核级SA-508 Gr.3 Cl.1材料拉伸与压缩蠕变行为的比较研究[J]. 机械工程学报, 2023, 59(4): 96-104.

NIU Tianye, GAO Yongjian, TAO Xianchao, ZHAO Peng, GONG Jianguo, XUAN Fuzhen. Comparison of Tensile and Compressive Creep Behavior of SA-508 Gr.3 Cl.1 Steel for Nuclear Applications[J]. Journal of Mechanical Engineering, 2023, 59(4): 96-104.

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核级SA-508 Gr.3 Cl.1材料拉伸与压缩蠕变行为的比较研究

Comparison of Tensile and Compressive Creep Behavior of SA-508 Gr.3 Cl.1 Steel for Nuclear Applications

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