The effect of microstructure evolution on the ratchetting-fatigue interaction of carbide-free bainite rail steels under different heat-treatment conditions

Xu, Xiangyu; Wang, Ziyi; Gao, Guhui; Zhang, Xu; Kan, Qianhua

doi:10.1016/j.ijfatigue.2022.106872

Cited by 15 publications

(2 citation statements)

References 44 publications

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“…Through the precipitation hardening process, the second phase particles dispersed within the aluminum matrix, and Al-Si samples showed cyclic softening, promoting the ratcheting progress. The concurrent effects of heat treatment post-processing on ratcheting and fatigue in carbide-free bainite rail steel samples have been investigated by Xu et al [34]. Because of the different heat treatment conditions, the 1380G rail steel microstructure possessed a finer lath and a more stable retained austenite than the 1280G rail steel.…”

Section: Introductionmentioning

confidence: 99%

Ratcheting Response of Heat-Treated Notched 1045 Steel Samples Undergoing Asymmetric Uniaxial Loading Cycles

Hatami,

Varvani-Farahani

2024

Applied Mechanics

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The present study evaluates the ratcheting response of notched cylindrical samples made of 1045 steel alloy subjected to asymmetric loading cycles using the kinematic hardening framework, coupled with Neuber’s rule. Test samples with V-shaped and semi-circular edge notches were first heat-treated under different conditions, resulting in various material hardness values at the notch root region. Local ratcheting at the notch root of samples was found to be highly dependent on the notch shape and the heat treatment conditions. HT1 samples with a lower hardness of 12 RC at the notch region possessed higher values of ratcheting, while ratcheting at the notched region for HT2 samples with 40 RC dropped to half of that in HT1 samples. The higher hardness of 50 RC at the notch edge of HT3 samples promoted the initial yield strength and the yield surface through the kinematic hardening rule with a larger translation into the deviatoric stress space as compared with samples HT1 and HT2 with 12 and 40 RC, respectively. The local ratcheting strain in sample HT1, with semi-circular notches (Kt=1.65) at a stress ratio (Smax/Sult) of 0.965, remained below 1.80% during the first hundred loading cycles. The local ratcheting decreased to 1.2% for sample HT2 and further dropped to 0.9% for sample HT3. The yield surfaces were translated consistent with the magnitude and direction of the backstress increments, as the applied loading excursion exceeded the elastic limit. Through the use of the Ahmadzadeh–Varvani (A–V) hardening rule, the predicted ratcheting values at notch roots were found to be larger in magnitudes as compared with those of experimental data, while the predicted local ratcheting through the Chaboche (CH) hardening rule fell below the experimental data. Results consistently showed that as sample hardness increased, the local ratcheting at notch roots decreased.

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Section: Introductionmentioning

confidence: 99%

Ratcheting Response of Heat-Treated Notched 1045 Steel Samples Undergoing Asymmetric Uniaxial Loading Cycles

Hatami,

Varvani-Farahani

2024

Applied Mechanics

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“…Over the past decades, significant progress has been made on the base material of CFB rails, such as industrial production [11], wear and contact fatigue damage [12][13][14][15], ratchetting-fatigue interaction [16] and hydrogen embrittlement behavior [17,18]. Nevertheless, given that rail welding is the principal method to realize seamless railway which can greatly improves the running speed, stability and riding comfort of trains [19], the service performance of welded joints of bainitic rails as the weak area of the whole track structure remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolutions and impact toughness in simulated welding heat affected zones for a high-strength carbide-free bainitic rail steel

Bai

Liu

et al. 2023

Materials Science and Engineering: A

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Effects of Loading Frequency, Mean Stress and Stress Amplitude on Ratchetting-Fatigue Behavior in 42CrMo Steel Under Near-Yield Stress-Controlled Condition

Sui,

Wang,

Jiang

et al. 2023

Metall Mater Trans A

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The effect of microstructure evolution on the ratchetting-fatigue interaction of carbide-free bainite rail steels under different heat-treatment conditions

Cited by 15 publications

References 44 publications

Ratcheting Response of Heat-Treated Notched 1045 Steel Samples Undergoing Asymmetric Uniaxial Loading Cycles

Ratcheting Response of Heat-Treated Notched 1045 Steel Samples Undergoing Asymmetric Uniaxial Loading Cycles

Microstructural evolutions and impact toughness in simulated welding heat affected zones for a high-strength carbide-free bainitic rail steel

Effects of Loading Frequency, Mean Stress and Stress Amplitude on Ratchetting-Fatigue Behavior in 42CrMo Steel Under Near-Yield Stress-Controlled Condition

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