Very high cycle fatigue crack initiation mechanisms in nickel-based superalloy at elevated temperatures: Competitive and transition roles of twins vs. Inclusions

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-03-26 DOI:10.1016/j.ijfatigue.2025.108959

Junhuan Wang, Hongchang Ma, Wei Hua, Qi Hu, Rui Chen, Hongqian Xue

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Abstract

Through high-temperature ultrasonic fatigue testing and microstructural characterization techniques, the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) behaviors of GH4169 superalloy under high-temperature conditions were investigated, along with the microstructural configurations related to fatigue crack initiation. The results were compared with the previous VHCF test data conducted at room temperature. It was found that the HCF and VHCF lives of GH4169 superalloy decrease significantly with increasing temperature, which is related to a transition in the crack initiation sites at high temperatures. Additionally, a competitive failure mode between internal and external crack initiation sites appears within the HCF range. Detailed investigation of the characteristics of preferred strain localization and microcrack initiation regions revealed that the crack initiation life fraction at high temperatures is shortened. Furthermore, at high temperatures, the activation of a new cubic slip system, along with thermal activation effects and the thermal expansion mismatch between non-metallic inclusions (NMIs) and the matrix, leads to a transition of VHCF crack initiation sites from twin boundaries (TBs) at room temperature to NMIs at high temperatures.

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高温下镍基高温合金的高周疲劳裂纹萌生机制：孪晶与夹杂物的竞争和转变作用

通过高温超声疲劳试验和显微组织表征技术，研究了高温条件下GH4169高温合金的高周疲劳（HCF）和甚高周疲劳（VHCF）行为，以及与疲劳裂纹萌生有关的显微组织形态。结果与之前在室温下进行的VHCF试验数据进行了比较。结果表明，GH4169高温合金的HCF和VHCF寿命随温度升高而显著降低，这与高温下裂纹萌生部位发生转变有关。此外，在HCF范围内，内部和外部裂纹起裂点之间出现竞争破坏模式。对优选应变局部化和微裂纹起裂区域特征的详细研究表明，高温下裂纹起裂寿命分数缩短。此外，在高温下，新的立方滑移系统的激活，以及热激活效应和非金属夹杂物（nmi）与基体之间的热膨胀失配，导致VHCF裂纹起裂点从室温下的孪晶界（TBs）转变为高温下的nmi。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.