WC增强镍基激光熔覆层的显微组织和高周疲劳断裂特性

IF 4.8 3区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Annals of the New York Academy of Sciences Pub Date : 2025-08-27 DOI:10.1111/nyas.70039

Sha Wu, Wenjun Zhang, Zenghua Liu, Xuze Wu, Ziyin Xiang, Wen Liu

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引用次数: 0

摘要

航空发动机和动力总成部件在高温和循环载荷下工作，容易出现疲劳失效。激光熔覆（LC）由于其强大的冶金结合和灵活的加工工艺而成为一种可持续的修复技术。然而，在LC过程中，快速的热循环会引入气孔、裂纹和夹杂物等缺陷，从而损害疲劳性能。Ni60A合金因其优异的可加工性被广泛应用于LC中，碳化钨（WC）通过界面结合、位错阻挡和硬相的形成提高了耐磨性和抗疲劳性。尽管取得了进展，但LC修复部件的高周疲劳（HCF）行为和断裂机制仍未得到充分研究，特别是WC粒度、分布和与位错的相互作用。研究了Ni60A/25%WC激光熔覆层在室温下的拉伸性能和HCF性能。生成S-N曲线，分析断口形貌，了解疲劳裂纹的萌生和扩展过程。利用能量色散光谱研究了WC/W2C对材料微观结构和力学性能的影响。我们的研究结果强调了WC颗粒的形态和分布如何影响疲劳抗力，为了解疲劳失效机制提供了见解，并为改进高性能系统中关键部件的LC修复策略奠定了基础。

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Microstructure and high‐cycle fatigue fracture characteristics of WC‐enhanced nickel‐based laser cladding coating

Aeroengine and powertrain components operate under elevated temperatures and cyclic loading, making them prone to fatigue failure. Laser cladding (LC) has emerged as a sustainable repair technology due to its strong metallurgical bonding and flexible processing. However, rapid thermal cycles during LC can introduce defects such as pores, cracks, and inclusions that impair fatigue performance. Ni60A alloy is widely used in LC for its excellent processability, and reinforcement with tungsten carbide (WC) enhances wear and fatigue resistance through interfacial bonding, dislocation hindrance, and the formation of hard phases. Despite advances, high‐cycle fatigue (HCF) behavior and fracture mechanisms in LC‐repaired components remain underexplored—particularly the role of WC particle size, distribution, and interaction with dislocations. This study examines tensile and HCF properties of Ni60A/25%WC laser‐clad coatings at room temperature. S–N curves were generated and fracture surfaces analyzed to understand fatigue crack initiation and propagation. Energy‐dispersive spectroscopy was used to investigate the influence of WC/W2C on microstructure and mechanical performance. Our findings highlight how WC particle morphology and distribution affect fatigue resistance, providing insight into fatigue failure mechanisms and establishing a foundation for improved LC repair strategies of critical components in high‐performance systems.

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来源期刊

Annals of the New York Academy of Sciences 综合性期刊-综合性期刊

CiteScore

11.00

自引率

1.90%

发文量

193

审稿时长

2-4 weeks

期刊介绍： Published on behalf of the New York Academy of Sciences, Annals of the New York Academy of Sciences provides multidisciplinary perspectives on research of current scientific interest with far-reaching implications for the wider scientific community and society at large. Each special issue assembles the best thinking of key contributors to a field of investigation at a time when emerging developments offer the promise of new insight. Individually themed, Annals special issues stimulate new ways to think about science by providing a neutral forum for discourse—within and across many institutions and fields.