A Transition Size of Dividing Crack Initiation and Propagation Phases and the Fatigue Total Life Prediction Approach

Li, Chong; Xie, Liyang; Zhao, Haifeng; Song, Jiaxin; Zhao, Zhiqiang

doi:10.1007/s11668-019-00726-7

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…Previous studies have established that the smaller the size of the precipitates, the better the effect of the dispersion material. Moreover, the greater the crack and dissolution resistance of the material precipitates, the stronger the fatigue resistance of the material [ 29 , 30 ]. Nonetheless, the ZG2 precipitated phase is fine, regular, and uniform, perhaps stronger than that of ZG1, which is consistent with its softening resistance.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Thermal Fatigue Life and Crack Morphology in Brake Discs of Low-Alloy Steel for High-Speed Trains

Wang

Chen²,

Zuo³

et al. 2022

Materials

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Effective braking in high-speed trains is one of the major bottlenecks in expediting the technology and possibilities to improve speed. Although substantial progress has been made to increase operating speed, perhaps, thermal fatigue cracking in brake discs is a primary constraint so far. Thermal fatigue cracking is the major cause of brake disc failure in high-speed trains, especially trains with a speed of 350 km/h or above. In this study, new material composition is proposed for brake discs of high-speed trains. A comprehensive investigation is presented based on fatigue crack initiation and propagation, along with wear and micro-hardness characterization. Thermal fatigue tests at various thermal cycles between 20 ℃ and 700 ℃ were performed and the experimental results are compared with fatigue properties of a commercial brake disc material. An experimental trial revealed that thermal cracks normally initiate and propagate along the oxidized grain boundaries; nevertheless, crack propagation is restricted by the fine precipitates and lath structure of martensitic. Moreover, crack length at the initiation and propagation stage is predicted through crack growth rate and favorable grain size in the crack vicinity. Thermal fatigue life can be improved by dictating the microstructure and precipitate morphology of cast steel by tailoring the alloying composition.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Thermal Fatigue Life and Crack Morphology in Brake Discs of Low-Alloy Steel for High-Speed Trains

Wang

Chen²,

Zuo³

et al. 2022

Materials

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show abstract

“…23, the predictions of Eq (3.2) are found to perform well when applied stress is below the yielding strength of Haynes 282 as compared to the experimental data.…”

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confidence: 70%

Microstructure-Based Computational Fatigue Life Prediction of Structural Materials

Li¹

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Investigation of fatigue crack growth behavior and crack tip plastic zone characteristics in welded structures based on local displacement fields

Zhang,

Huang,

Yang

et al. 2024

Engineering Fracture Mechanics

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A Transition Size of Dividing Crack Initiation and Propagation Phases and the Fatigue Total Life Prediction Approach

Cited by 6 publications

References 18 publications

Evaluation of Thermal Fatigue Life and Crack Morphology in Brake Discs of Low-Alloy Steel for High-Speed Trains

Evaluation of Thermal Fatigue Life and Crack Morphology in Brake Discs of Low-Alloy Steel for High-Speed Trains

Microstructure-Based Computational Fatigue Life Prediction of Structural Materials

Investigation of fatigue crack growth behavior and crack tip plastic zone characteristics in welded structures based on local displacement fields

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