轧制对FeCrAl合金超长寿命裂纹行为的影响

IF 3.5 Q1 ENGINEERING, MULTIDISCIPLINARY International Journal of Structural Integrity Pub Date : 2023-09-12 DOI:10.1108/ijsi-05-2023-0037
Min Zhan, Yajun Dai, Chang Liu, Xiangyu Wang, Lang Li, Yongjie Liu, Chao He, Qingyuan Wang
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引用次数: 0

摘要

目的研究FeCrAl合金的显微组织与疲劳裂纹行为的关系,以及轧制对裂纹萌生和扩展过程的影响。采用扫描电子显微镜和非接触式光学测量系统(IFMG5)对骨折进行定性和定量研究。结果表明:裂纹起裂区、早期裂纹扩展区晶面、粗糙晶面和平行条纹的形成与裂纹行为对材料微观组织的敏感性密切相关。此外,轧制过程对小裂纹的萌生和扩展行为有显著影响。定量分析表明,粗区应力强度因子和塑性区尺寸的大小与轧制工艺有关。本研究的发现有可能增强对FeCrAl合金微观组织裂纹形成机制的理解,并阐明轧制对这些合金长期和超长疲劳行为的影响。这一新知识对于改进制造工艺和确保核工业应用中使用的FeCrAl合金的安全性和可靠性至关重要。
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Effect of rolling on crack behavior of FeCrAl alloys in ultra-long life
Purpose The purpose of this paper is to determine (1) the relationship between microstructure and fatigue cracking behavior and (2) effect of rolling on the process of crack initiation and propagation in FeCrAl alloys. Design/methodology/approach The qualitative and quantitative fracture studies were performed using scanning electron microscopy and the non-contact optical measurement system (IFMG5). Findings The results show that the formation of facets, rough facets and parallel stripes in the crack initiation and early crack propagation zones are closely related to the sensitivity of crack behavior to the microstructure of the material. Besides, the rolling process has a significant influence on the small crack initiation and propagation behavior. Quantitative analysis demonstrates that the size of the stress intensity factor and plastic zone size in the rough zone is associated with the rolling process. Originality/value The findings of this study have the potential to enhance the understanding of the microstructural crack formation mechanisms in FeCrAl alloys and shed light on the impact of rolling on the long-term and ultra-long fatigue behavior of these alloys. This new knowledge is vital for improving manufacturing processes and ensuring the safety and reliability of FeCrAl alloys used in nuclear industry applications.
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来源期刊
International Journal of Structural Integrity
International Journal of Structural Integrity ENGINEERING, MULTIDISCIPLINARY-
CiteScore
5.40
自引率
14.80%
发文量
42
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