Magnetic Indicator for Evaluating Cu Clustering and Hardening Effect in RPV Model Alloy

IF 2.6 3区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Metals Pub Date : 2024-08-28 DOI:10.3390/met14090973
Wenqing Jia, Qiwei Quan, Wangjie Qian, Chuang Bian, Chaoliang Xu, Jian Yin, Bin Li, Yuanfei Li, Minyu Fan, Xiangbing Liu, Haitao Wang
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引用次数: 0

Abstract

The reactor pressure vessel (RPV) is a critical barrier in nuclear power plants, but its embrittlement during service poses a significant safety challenge. This study investigated the effects of Cu-enriched clusters on the mechanical and magnetic properties of Fe-0.9 wt.%Cu model alloys through thermal aging. Using Vickers hardness tests, Magnetic Barkhausen Noise (MBN) detection, and Atom Probe Tomography (APT), the study aimed to establish a quantitative correlation between MBN signals, Vickers hardness, and Cu-enriched clusters, facilitating the non-destructive testing of RPV embrittlement. Experimental results showed that the hardness and MBN parameters (RMS and Vpp values) changed significantly with aging time. The hardness increased rapidly in the early stage (under-aged), followed by a plateau and then a decreasing trend (over-aged). In contrast, MBN parameters decreased initially and then increased. APT analysis revealed that Cu-enriched clusters increase in size to 4.60 nm and coalesced during aging, with their number density peaking to 3.76 × 1023 m−3 before declining. An inverse linear correlation was found between MBN signals and the combined factor Nd2Rg (product of the number density squared and the mean radius of Cu-enriched clusters). This correlation was consistent across both under-aged and over-aged states, suggesting that MBN signals can serve as applicable indicators for the non-destructive evaluation of RPV steel embrittlement.
用于评估 RPV 模型合金中铜簇和硬化效应的磁性指示器
反应堆压力容器(RPV)是核电站的关键屏障,但其在使用过程中的脆化问题对安全构成了巨大挑战。本研究调查了富铜簇通过热老化对 Fe-0.9 wt.%Cu 模型合金的机械和磁性能的影响。该研究使用维氏硬度测试、磁性巴克豪森噪声(MBN)检测和原子探针层析成像(APT),旨在建立 MBN 信号、维氏硬度和富集铜簇之间的定量相关性,从而促进对 RPV 脆性的无损检测。实验结果表明,硬度和 MBN 参数(均方根值和 Vpp 值)随着老化时间的延长而发生显著变化。硬度在早期阶段(时效不足)迅速增加,随后出现平稳,然后呈下降趋势(时效过长)。相比之下,MBN 参数最初下降,然后上升。APT 分析表明,富含铜的簇在老化过程中尺寸增大到 4.60 纳米并凝聚在一起,其数量密度达到 3.76 × 1023 m-3 的峰值,然后开始下降。在 MBN 信号和综合因子 Nd2Rg(数量密度平方和富铜簇平均半径的乘积)之间发现了反向线性相关。这种相关性在欠时效和超时效状态下都是一致的,这表明 MBN 信号可作为 RPV 钢脆化非破坏性评估的适用指标。
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
Metals
Metals MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING
CiteScore
4.90
自引率
13.80%
发文量
1832
审稿时长
1.5 months
期刊介绍: Metals (ISSN 2075-4701) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Metals provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of metals.
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