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搅拌摩擦焊 AA2024-T4 接头疲劳裂纹扩展过程中微观结构响应的准原位观察

Quasi-In Situ Observation of the Microstructural Response during Fatigue Crack Growth of Friction Stir Welded AA2024-T4 Joint.

作者信息

Yang Jun, Chen Xianmin, Zhao Huaxia, Dong Jihong, Jin Feng

机构信息

National Key Laboratory of Strength and Structural Integrity, AVIC Aircraft Strength Research Institute, 86 2nd Dianzi Road, Xi'an 710065, China.

The 3rd Department, AVIC Aircraft Strength Research Institute, 86 2nd Dianzi Road, Xi'an 710065, China.

出版信息

Materials (Basel). 2024 Apr 29;17(9):2106. doi: 10.3390/ma17092106.

DOI:10.3390/ma17092106
PMID:38730913
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11084646/
Abstract

The reliability of friction stir welded joints is a critical concern, particularly given their potential applications in the aerospace manufacturing industry. This study offers a quasi-in situ observation of the microstructural response during fatigue crack growth (FCG) of a friction stir welded AA2024-T4 joint, aiming to correlate fatigue crack growth behavior with mechanical properties investigated using electron backscatter diffraction (EBSD). Notched compact tension (CT) specimens corresponding to the morphology of the stir zone (SZ), advancing side (AS), and retreating side (RS) were meticulously designed. The findings indicate that the welding process enhances the joint's resistance to fatigue crack growth, with the base metal exhibiting a shorter fatigue life (i.e., ~10 cycles) compared to the welding zones (SZ ~ 3.5 × 10 cycles, AS ~ 2.5 × 10 cycles, and RS ~ 3.0 × 10 cycles). Crack propagation occurs within the stir zone, traversing refined grains, which primarily contribute to the highest fatigue life and lowest FCG rate. Additionally, cracks initiate in AS and RS, subsequently expanding into the base metal. Moreover, the study reveals a significant release of residual strain at the joint, particularly notable in the Structural-CT-RS (Str-CT-RS) sample compared to the Str-CT-AS sample during the FCG process. Consequently, the FCG rate of Str-CT-AS is higher than that of Str-CT-RS. These findings have significant implications for improving the reliability and performance of aerospace components.

摘要

搅拌摩擦焊接接头的可靠性是一个关键问题，特别是考虑到它们在航空航天制造业中的潜在应用。本研究对搅拌摩擦焊接的AA2024-T4接头疲劳裂纹扩展（FCG）过程中的微观结构响应进行了准原位观察，旨在将疲劳裂纹扩展行为与使用电子背散射衍射（EBSD）研究的力学性能相关联。精心设计了与搅拌区（SZ）、前进侧（AS）和后退侧（RS）形态相对应的缺口紧凑拉伸（CT）试样。研究结果表明，焊接过程增强了接头对疲劳裂纹扩展的抵抗力，与焊接区（SZ约3.5×10次循环，AS约2.5×10次循环，RS约3.0×10次循环）相比，母材的疲劳寿命较短（即约10次循环）。裂纹在搅拌区内扩展，穿过细化晶粒，这些晶粒主要贡献了最高的疲劳寿命和最低的FCG速率。此外，裂纹在AS和RS中萌生，随后扩展到母材中。此外，研究还揭示了接头处残余应变的显著释放，在FCG过程中，与Str-CT-AS试样相比，在Structural-CT-RS（Str-CT-RS）试样中尤为明显。因此，Str-CT-AS的FCG速率高于Str-CT-RS。这些发现对提高航空航天部件的可靠性和性能具有重要意义。

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本文引用的文献

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Friction Stir Welding of Aluminum in the Aerospace Industry: The Current Progress and State-of-the-Art Review.航空航天工业中铝的搅拌摩擦焊：当前进展与技术现状综述
Materials (Basel). 2023 Apr 8;16(8):2971. doi: 10.3390/ma16082971.
2
Experimental Investigation of Fatigue Crack Growth Behavior of the 2.25Cr1Mo0.25V Steel Welded Joint Used in Hydrogenation Reactors.加氢反应器用2.25Cr1Mo0.25V钢焊接接头疲劳裂纹扩展行为的试验研究
Materials (Basel). 2021 Mar 1;14(5):1159. doi: 10.3390/ma14051159.