基于滑移氧化机制预测 dK/da 对辐照不锈钢应力腐蚀裂纹生长率的影响

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-27 DOI:10.1016/j.nucengdes.2024.113610

Masato Koshiishi

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引用次数: 0

摘要

本研究开发了一种预测辐照不锈钢（SS）在不同应力强度因子（K）条件下应力腐蚀开裂（SCC）裂纹生长率（CGR）的方法。首先，利用裂纹尖端应变率的 Rice、Dugan 和 Sham（RDS）方程，优化了用于计算不同 dK/da 条件下 CGR 的 HashimotoKoshiishi 模型方程。其次，设置模型输入系数，将 dK/da 对 SCC CGR 的影响纳入其中，以拟合实验数据。最后，考虑到焊接残余应力分布，评估了 dK/da 对 3 dpa 辐照核心护罩 SS 的 CGR 的影响。模型预测结果表明，在沸水反应堆（BWR）正常水化学条件下，堆芯护罩板厚方向上 K 值增大和减小的区域对 CGR 的影响很小，但在沸水反应堆氢水化学条件下，K 值减小的区域对 CGR 的影响不容忽视。

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Prediction of dK/da effects on stress corrosion crack growth rate of irradiated stainless steels based on slip oxidation mechanism

This study developed a predicting method for the crack growth rate (CGR) of stress corrosion cracking (SCC) under varying stress intensity factor (K) conditions for irradiated stainless steel (SS). First, optimization of the Hashimoto-Koshiishi model equation for calculating CGR under varying dK/da conditions was carried out using the Rice, Dugan, and Sham (RDS) equation for the crack tip strain rate. Second, the model input coefficients were set to incorporate the effect of dK/da on SCC CGR to fit the experimental data. Finally, the effect of dK/da on the CGR for 3 dpa irradiated SS of a core shroud was evaluated taking into account the weld residual stress distribution. The model prediction showed that there was little effect on the CGR for the increasing and decreasing K regions in the plate thickness direction of the core shroud under boiling water reactor (BWR) normal water chemistry, but the effect was not negligible for the decreasing K region under BWR hydrogen water chemistry.

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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.