Creep-to-rupture of T91 steel in static liquid lead-bismuth eutectic: Effects of cyclic temperature and oxygen environment

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2024-10-16 DOI:10.1016/j.engfracmech.2024.110539

Zhikun Zhou , Chenwen Tian , Qun Zhang , Juan Du , Chuang Zhang , Hengjie Liu , Xing Gong , Magd Abdel Wahab , Ziguang Chen

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Abstract

The creep-to-rupture behavior of T91 steel in static liquid lead–bismuth eutectic (LBE) is investigated, focusing on the impacts of cyclic temperature and oxygen condition. The results indicate that thermal cycling, oxygen deficiency, and high applied stress levels significantly accelerate creep deformation and reduce the creep-to-rupture lifetime of T91 steel in LBE. Surface oxide scales on T91 steel and their self-healing mechanisms play a crucial role in enhancing the creep resistance by isolating the LBE contact and delaying crack initiation and propagation. However, the integrity of this oxide scale is compromised under cyclic thermal conditions and low oxygen levels, leading to premature failure. Microstructural examinations reveal the evolution of oxide scale damage and self-healing mechanisms. The findings suggest that oxide scale failure mechanisms should be considered when designing the long-term operational performance of advanced LBE-based reactors.

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静态液态铅铋共晶中 T91 钢的蠕变到破裂：循环温度和氧气环境的影响

研究了 T91 钢在静态液态铅铋共晶（LBE）中的蠕变到脆化行为，重点是循环温度和氧气条件的影响。结果表明，热循环、缺氧和高外加应力显著加速了 T91 钢在 LBE 中的蠕变变形，并缩短了其蠕变脆化寿命。T91 钢表面的氧化鳞片及其自修复机制通过隔离 LBE 接触、延迟裂纹的产生和扩展，在增强抗蠕变性方面发挥了重要作用。然而，在循环热条件和低氧水平下，这种氧化鳞片的完整性会受到破坏，从而导致过早失效。微观结构检查揭示了氧化鳞片损坏的演变过程和自修复机制。研究结果表明，在设计基于 LBE 的先进反应堆的长期运行性能时，应考虑氧化鳞片的失效机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.