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首页> 外文期刊>Materials Science and Engineering >Study on high temperature creep behavior of the accident-resistant cladding Fe-13Cr-4Al-1.85Mo-0.85Nb alloy
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Study on high temperature creep behavior of the accident-resistant cladding Fe-13Cr-4Al-1.85Mo-0.85Nb alloy

机译：耐用耐用熔覆Fe-13Cr-4Al-1.85Mo-0.85nB合金的高温蠕变行为研究

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摘要

The Fe-13Cr-4Al-l.85Mo-0.85Nb alloy, as accident-resistant fuel cladding material in light water reactor (LWR), was prepared by a vacuum induction melting, forging and hot rolling process. In this study, the creep behaviors of the alloy at the temperature range of 400-450 °C were studied. The effects of rolling direction (RD), transverse direction (TD), creep temperatures and stresses on the creep properties were systematically investigated. The results show that the steady-state creep rates of the FeCrAl alloy increase with the increase of the loaded stress, which vary in the range of 8.81 × 10~10 s~(-1) to 8.40 × 10~(-8) s~(-1) in the RD and 8.30 × 10~(-9) s~(-1) to 5.17 × 10~(-7) s~(-1) in the TD. Based on the analysis of the real stress exponent n equaling to 5.0, the creep processes in the both RD and TD are controlled by dislocation climbing mechanism, as evidenced by the microstructure of dislocations tangled with precipitations after creep test. At 540 MPa and the temperatures of 400-450 °C, the creep activation energies in the RD and TD are 421.06 kJ mol~(-1) and 424.7 kJ mol~(-1) respectively. Before creep test, the dispersion of fine Mo-, Nb-, and Si-rich Laves phases is observed. After creep test, 'spheroidization' of these secondary Laves phases obviously occurs. EBSD analysis shows that the grains in the TD are smaller and equiaxed, while the grains in the RD are large and deformed. This is one of the reasons on the big differences of the creep rate of the alloy in the TD comparing with the RD. The average geometrically necessary dislocations (GNDs) of the cross-sectional structure of the alloy decrease after creep test in both the RD and TD. Moreover, the creep rate in the RD is about 1/10 of that in the TD, mainly due to the large elongated grains with less grain boundaries and higher GNDs in the RD. The obtained conclusions provide researchers and engineers with useful references for the engineering application of the FeCrAl alloy as accident-resistant fuel cladding material.
机译：通过真空感应熔化，锻造和热轧工艺制备Fe-13CR-4AL-L.85MO-0.85NB合金作为在轻水反应器（LWR）中的耐用耐燃料包覆材料（LWR）。在该研究中，研究了400-450℃温度范围内合金的蠕变行为。系统地研究了滚动方向（RD），横向（Td），蠕变温度和应力对蠕变性质的影响。结果表明，群体合金的稳态蠕变率随加载应力的增加而增加，在8.81×10〜10 s〜（-1）至8.40×10〜（-8）的范围内变化〜（-1）在RD和8.30×10〜（-9）S〜（-1）到5.17×10〜（-7）S〜（-1）在TD中。基于对等于5.0的实际应力指数N的分析，RD和TD中的蠕变过程由位错爬爬机构控制，如蠕变试验后缠绕沉淀的位移的微观结构所证明的。在540MPa和400-450°C的温度下，RD和TD中的蠕变激活能量分别为421.06 kJ mol〜（-1）和424.7 kJ mol〜（-1）。在蠕变试验之前，观察到细0，NB-和富含Si的疏浚阶段的分散。在蠕变试验后，这些二次救生圈阶段的“球化”明显发生。 EBSD分析表明，TD中的谷物较小且等于均匀，而RD中的颗粒大而变形。这是与RD比较TD中合金蠕变率大差异的原因之一。在RD和TD中蠕变试验后，合金的横截面结构的平均几何必要脱位（GNDS）降低。此外，RD中的蠕变率在TD中约为1/10，主要是由于具有较少晶界和RD中的更高GND的大的细长晶粒。所获得的结论为研究人员和工程师提供了对群合金的工程应用作为事故耐燃料包层材料的有用参考。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140688.1-140688.10|共10页
  • 作者

    Hongying Sun; Hui Wang; Xiujie He; Fu Wang; Xuguang An; Zhigang Wang;

  • 作者单位

    School of Mechanical Engineering Anyang Institute of Technology Anyang 455002 China;

    Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu 610041 China;

    Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Zhuhai 519082 China;

    School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 China;

    School of Mechanical Engineering Chengdu University Chengdu 610106 China;

    School of Mechanical Engineering Anyang Institute of Technology Anyang 455002 China Key Laboratory of Advanced Aeronautical Materials and Processing Technology Anyang Institute of Technology Anyang 455002 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    FeCrAl alloy; Creep properties; Nb; Microstructure;

    机译：Fecral合金;蠕变性质;NB;微观结构;

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