Effect of Overheating Events on Microstructure and Low-Cycle Fatigue Properties of a Nickel-Based Single-Crystal Superalloy

Zhao, Yongsheng; Guo, Yuanyuan; Liu, Yanfei; Zhang, Jian; Luo, Yang; Yao, Zhihao

doi:10.1007/s11661-022-06663-9

Cited by 9 publications

(1 citation statement)

References 25 publications

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“…Further, in the order of CWS, TWS, and SWS, the ratio of the whole areas of Zone I and Zone II exhibits a continuous increasing trend. In general, the crack initiation and propagation life account for the majority of the fatigue life [11], and larger areas of Zone I and Zone II imply a higher fatigue life of the specimens [16,17]. The areas of Zone I and Zone II exhibited a continuous increasing trend in the order of CWS, TWS, and SWS, indicating an increasing fatigue life, which was consistent with the fatigue life results presented in Figure 3.…”

Section: Fatigue Fracture Behaviorsupporting

confidence: 85%

Influence of Loading Waveform on the Fatigue Life of 34CrNi3MoVA Steel

Guan,

Tang,

Chen

2024

Metals

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Mechanical components often experience fatigue loading from various waveform conditions during their operational lifespan. However, the underlying mechanisms through which variations in loading waveform affect the fatigue life of components remain unclear. Thus, this study conducted tension–compression fatigue experiments on 34CrNi3MoVA steel specimens under the same stress amplitude with different waveforms (cosine, triangular, sawtooth, and reverse sawtooth) to investigate the effects of loading waveform variations on the cyclic strain hardening behaviors, the fatigue fracture failure, and the fatigue life. The results indicated that specimens under different waveforms all exhibited cyclic strain hardening. The fatigue cyclic hardening level progressively increased in the order of cosine, triangular, and sawtooth waveforms, resulting in a continuous increase in cyclic saturation strain amplitude. The analysis of fatigue fractures demonstrated a consistent increase in both the initiation and propagation zone areas in the order of cosine, triangular, and sawtooth waveforms, and the boundary between the propagation and final fracture zones gradually shifted from a straight to a curved shape. The influence mechanisms of cyclic loading waveforms on the fatigue life of specimens were analyzed based on the energy dissipation, leading to the development of a universal fatigue life prediction model applicable to different waveform conditions, the model was then verified with the reverse sawtooth wave specimens and resulted in a prediction error less than 15%. The study is expected to serve as a significant guide for predicting and evaluating the fatigue life of mechanical components under various fatigue loading conditions.

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Section: Fatigue Fracture Behaviorsupporting

confidence: 85%