Zr合金表面Cr涂层多重裂纹行为的中尺度数值研究

IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Wenjie Zhang, Hailin Zhai, Mingjie Wu, Ziyi Li, Baiming Yao, Weidong Zhai, Jishen Jiang, Xianfeng Ma
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引用次数: 0

摘要

铬(Cr)包覆锆(Zr)合金被认为是轻水反应堆耐事故燃料(ATF)包覆层的候选材料。然而,外载荷作用下Cr涂层的多重裂纹行为可能会对涂层的完整性造成潜在的威胁。对这种与温度和微观结构相关的微裂纹行为缺乏全面的机理研究。基于晶体塑性有限元模型(CPFEM)和扩展有限元方法(XFEM),建立了Cr包覆Zr合金Cr包覆层开裂行为的中尺度数值模型。结果表明:涂层裂纹的初始形核位置受晶粒取向分布的支配,局部错取向的大小影响裂纹的起裂速率;镀层裂纹的演化和饱和程度取决于镀层的晶粒特征和岛状长度。晶粒取向决定裂纹的定位,而岛状长度决定裂纹能否通过涂层厚度扩展。提出了一种基于应力场分布估计涂层饱和裂纹密度的方法,饱和裂纹预测结果与直接裂纹模拟结果一致。涂层饱和裂纹密度在400℃时的降低直接归因于基体塑性的增强,这导致应变局部化和显著的裂纹尖端钝化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mesoscale numerical investigation of the multi-cracking behavior of Cr coatings on Zr alloys
Chromium (Cr)-coated zirconium (Zr) alloys are considered candidate materials for accident-tolerant fuel (ATF) claddings in light-water reactors. However, the multi-cracking behavior of the Cr coating under external loading might be a potential threat to the integrity of the coated claddings during operation. Comprehensive mechanistic research on this temperature- and microstructure-dependent microcracking behavior is lacking. In this study, a mesoscale numerical model was built to study the cracking behavior of the Cr coating on Cr-coated Zr alloys based on a crystal plasticity finite element model (CPFEM) combined with the extended finite element method (XFEM). The results indicated that the nucleation site of the initial coating crack is governed by the grain orientation distribution, and the magnitude of the local misorientation influences the initiation rate. The evolution and saturation of the coating cracks are determined by the grain characteristics and island length. Grain orientation dictates crack positioning, whereas island length determines whether cracks can propagate through the coating thickness. A method for estimating the saturated crack density in coatings based on the stress field distribution is proposed, and the saturation crack predictions are consistent with direct crack simulation results. The observed reduction in coating saturation crack density at 400 °C is directly attributed to enhanced substrate plasticity, which results in strain localization and significant crack tip blunting.
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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