Low cycle fatigue behavior of Cr–Mo–V low alloy steel used for railway brake discs

Li, Zhiqiang; Han, Jingtao; Li, Weijing; Pan, Like

doi:10.1016/j.matdes.2013.10.093

Cited by 55 publications

(18 citation statements)

References 27 publications

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“…[22][23][24] If that is above the threshold value, cracks were observed. [25][26][27] The temperature investigation will help predict the speed threshold value for crack initiation of the disc.…”

Section: Introductionmentioning

confidence: 99%

Temperature evolution of the train brake disc during high-speed braking

Wang

Han

Liu

et al. 2019

Advances in Mechanical Engineering

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Temperature evolution of the train brake disc during high-speed braking was investigated using in situ experiments, theoretical analysis, and finite element modeling. The experimental results show that the temperature distribution on the friction surface experienced the formation of a hot ring first, then expansion and duration of the hot ring. Alternative hot spot and cold zone were observed on the friction surface, which is attributed to the local contact in the friction couple and heterogeneous heat dissipation condition in the disc. The corresponding maximum temperature in the disc increased rapidly first, kept stable then, and decrease slowly in the end. The one-dimensional heat conduction equation was applied to predict the maximum temperature variation and was found to be in agreement with the experimental results. Furthermore, the maximum temperature evolution and the temperature distribution of the disc at the braking time of 45 s were simulated by the finite element method, which is satisfactory. In additional, the temperature variation caused the corresponding fluctuation of instantaneous frictional coefficient and thermal stress distribution in the disc, which results in the thermal damages.

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Section: Introductionmentioning

confidence: 99%

Temperature evolution of the train brake disc during high-speed braking

Wang

Han

Liu

et al. 2019

Advances in Mechanical Engineering

Self Cite

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“…The brake disc is the final guarantee of train safety. Cr–Mo–V steel, which has good strength, toughness, and heat shock resistance is used in brake discs . During the braking process, the brake disc absorbs most friction heat resulting from the kinetic energy of railways.…”

Section: Introductionmentioning

confidence: 99%

“…The research showed that the brake disc steel was in a state of excessive tempering, that is, the carbides precipitated and the hardness decayed due to the frequently exposure at high temperatures, which lead to the generation of cracks. Li et al reported that the carbides aggregated and the oxide film generated after the low cycle fatigue test of Cr–Mo–V steel for brake discs, which promoted the generation and growth of cracks. The research showed the original microstructure of gray cast iron for brake discs degenerated and the hardness dropped obviously after repeated thermal cycles.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Wang

Cheng

et al. 2018

steel research int.

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To improve the performance of the steel for brake discs, like mechanical properties and thermal fatigue resistance, Nb is added to the steel. In this paper, the effects of Nb and tempering time on the microstructure and mechanical properties of the steel have been studied. The investigation of precipitation behaviors is based on Thermo‐Calc software and transmission electron microscopy. The results show there is a negative linear relationship between the yield strength and the logarithm of time, and tempering time should not exceed 2 h. V‐rich M8C7 and NbC occur during austenitizing, while (Mo,V)C, M23C6, and M7C3 precipitate during tempering. (Mo,V)C has a strong strengthening effect at the early stage of tempering, but it grows faster than M8C7. With 0.025% Nb addition, the yield strength and impact energy increase simultaneously due to the refinement of martensite; the addition of 0.045% Nb promotes the tempering stability due to the suppression of precipitation and coarsening of Cr carbides and the precipitation strengthening of M8C7 and NbC, therefore, the addition of 0.025–0.045% Nb is conducive to improving the performance of the steel. Moreover, the suppression of Cr carbides with 0.045% Nb addition makes up for the damage of large NbC to toughness.

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“…Modified cast irons and cast steels, which are used in the manufacture of brake disks, are another group of materials that can be exploited at elevated temperatures. In the works of Samec et al [6], Peve et al [7], and Li et al [8], the authors analyzed the fatigue life of the following materials: EN-GJS-500-7, EN-GJL-250, and Cr-Mo-V. Material cracking mechanisms were studied within the LCF range at temperature up to 700 • C, and the influence of temperature on the material's physical properties was defined.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Damage Accumulation Modeling of Metals Alloys under High Amplitude Loading at Elevated Temperatures

Szusta

Seweryn

2018

Metals

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This article presents an approach related to the modeling of the fatigue life of constructional metal alloys working under elevated temperature conditions and in the high-amplitude load range. The article reviews the fatigue damage accumulation criteria that makes it possible to determine the number of loading cycles until damage occurs. Results of experimental tests conducted on various technical metal alloys made it possible to develop a fatigue damage accumulation model for the LCF (Low Cycle Fatigue) range. In modeling, the material’s damage state variable was defined, and the damage accumulation law was formulated incrementally so as to enable the analysis of the influence of loading history on the material’s fatigue life. In the proposed model, the increment of the damage state variable was made dependent on the increment of plastic strain, on the tensile stress value in the sample, and also on the actual value of the damage state variable. The model was verified on the basis of data obtained from experiments in the field of uniaxial and multiaxial loads. Samples made of EN AW 2024T3 aluminum alloy were used for this purpose.

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Low cycle fatigue behavior of Cr–Mo–V low alloy steel used for railway brake discs

Cited by 55 publications

References 27 publications

Temperature evolution of the train brake disc during high-speed braking

Temperature evolution of the train brake disc during high-speed braking

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Fatigue Damage Accumulation Modeling of Metals Alloys under High Amplitude Loading at Elevated Temperatures

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