New insight into fatigue life of modified 9Cr-1Mo steel in liquid lead–bismuth environment and life prediction considering environmental factors

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-10-30 DOI:10.1016/j.nucengdes.2024.113648

Shouwen Shi , Wei Huang , Gaoyuan Xie , Weibin Li , Longyi Yang , Qiang Lin , Gang Chen , Xu Chen

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Abstract

The fatigue life of modified 9Cr-1Mo steel in liquid lead bismuth eutectic (LBE) at different strain amplitudes, temperatures and oxygen concentrations are analyzed. A liquid metal embrittlement (LME) factor of plastic strain is proposed to account for the reduced fatigue life induced by LME effect, which is also found to correlate well with tensile elongation in LBE. In low oxygen content LBE, the LME effect is influenced by temperature instead of plastic strain amplitude. While in high oxygen content LBE, the plastic LME factor is found to decrease exponentially with increasing plastic strain amplitude. Based on these findings, a fatigue life prediction model is proposed taking into account of different environmental influencing factors. In total, 86 data points are used with 70 % data points for independent validation only. Regardless of the discrepancy in fatigue life from different sources, good prediction results are still achieved with 98 % data points fall within ± 3 error band and 75 % data points fall within ± 2 error band.

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对液态铅铋环境中改性 9Cr-1Mo 钢疲劳寿命的新认识以及考虑环境因素的寿命预测

分析了液态铅铋共晶（LBE）中改性 9Cr-1Mo 钢在不同应变振幅、温度和氧浓度下的疲劳寿命。提出了塑性应变的液态金属脆化（LME）因子，以解释 LME 效应引起的疲劳寿命降低，该因子还与 LBE 中的拉伸延伸率密切相关。在低氧含量的鳞片状结晶器中，LME效应受温度而不是塑性应变振幅的影响。而在高含氧量的鳞片板材中，塑性 LME 因子会随着塑性应变振幅的增大而呈指数下降。基于这些发现，我们提出了一个考虑到不同环境影响因素的疲劳寿命预测模型。总共使用了 86 个数据点，其中 70% 的数据点仅用于独立验证。尽管不同来源的疲劳寿命存在差异，但仍取得了良好的预测结果，98% 的数据点在±3 的误差范围内，75% 的数据点在±2 的误差范围内。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.