The formation of martensite during the propagation of fatigue cracks in pearlitic rail steel

Liu, J.P.; Zhou, Quan; Zhang, Y.H.; Liu, F.S.; Tian, Chang Hai; Li, C.; Zhi, Xiaohu; Li, C.G.; Shi, Tiantian

doi:10.1016/j.msea.2019.01.049

Cited by 28 publications

(7 citation statements)

References 32 publications

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“…Fatigue behavior is an important mechanical property for many kinds of materials, especially in the automotive industry, and most of the fatigue fractures originate from internal or surface inclusions. Previous studies have proved that clusters of Al 2 O 3 particles cause poor fatigue properties in structural steel 26,27 , and oxide inclusions were most likely to cause fatigue fracture 28,29 . As fatigue life is an important mechanical performance index, the fatigue property of the five steel samples were investigated at 400 MPa stress amplitude.…”

Section: Discussionmentioning

confidence: 99%

Effect of Al2O3 in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

2022

Mat. Res.

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The influence of Al 2 O 3 content in refining slag on the cleanliness and fatigue property of ultra-lowcarbon (ULC) automotive steel were investigated based on the industrial experiments. The inclusionadsorption capacity of the refining slag was calculated and the total [O] (T.O) content of ULC automotive steel was measured. The number density, size distribution and morphology of inclusions were analyzed and their effects on the cleanliness and fatigue property of ultra-low-carbon (ULC) automotive steel were investigated. The results showed that as the Al 2 O 3 content in refining slag increased from 19.92% to 39.73%, the inclusion-adsorption capacity of ULC automotive steel decreased from 210.30 down to 57.12, and the fatigue life from 1.4x10 4 down to 0.9x10 4 cycles, while the T.O content of steel increased from 12 up to18 ppm and the inclusion number density from 4 up to 9 per mm 2 .

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Section: Discussionmentioning

confidence: 99%

Effect of Al2O3 in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

2022

Mat. Res.

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“…In the process of crack propagation, the blocky retained austenite can be easily transformed to brittle fresh martensite that could provide the crack propagation path. 5,32,33 In contrast, it has been considered that the filmy retained austenite (Figures 5 and 11A) has higher mechanical stability than the blocky ones. The stable filmy retained austenite can effectively relieve the local stress concentration of crack tip by TRIP effect as well as changes the FCP direction by BCP effect.…”

Section: Effect Of Microstructural Characteristics On the Fcp Ratementioning

confidence: 99%

Fatigue crack propagation behavior of multiphase microstructure in a quenched and partitioned medium‐carbon bainitic steel

Zhang

Luo

2022

Fatigue Fract Eng Mat Struct

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A medium‐carbon steel was treated by the bainitic isothermal transformation plus quenching and partitioning (B‐QP) process to obtain bainite/martensite/retained austenite multiphase microstructure, and its fatigue crack propagation (FCP) behavior was evaluated in contrast with BAT (bainite austempering) sample with fully bainite microstructure. Results show that B‐QP sample exhibits a lower FCP rate and higher fatigue threshold ΔKth (12.6 MPa·m1/2). Moreover, the FCP path of B‐QP sample displays a strongly tortuosity and more crack branching due to more filmy retained austenite (7.2%) and higher percentage of high angle misoriented boundaries (68%). The larger crack tortuosity and the secondary cracks as result of crack branching are primarily responsible for the lower FCP rate of B‐QP sample. In addition, the FCP rate curve of B‐QP sample shows a pronounced small plateauing at the near‐threshold zone, which can be ascribed to the mechanical twinning that occurred in the filmy retained austenite.

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“…The deterioration of rail track has already attracted attention, including wear, contact-impact, fatigue (often cited as RCF, i.e. rolling contact fatigue), corrosion, cracking and fracture (Hernandez et al 2007;Hernandez-Valle et al 2013;Liu et al 2019;Ren et al 2013;Safa et al 2015;Shariff et al 2013;Shurpali et al 2012;Yazici and Yilmaz 2018;Yu and Feng 2013;Zhao et al 2015). Among these research topics, wear, contact-impact, fatigue and corrosion are regarded as main factors initiating degradation of rail materials from the very beginning, while cracking and fracture can be regarded as the noticeable results of failure.…”

Section: Deterioration Of Rail Trackmentioning

confidence: 99%

Corrosion of rail tracks and their protection

Zhang

Deng

et al. 2020

Corrosion Reviews

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Rapid development of railway industry makes safety increasingly important. Wear, contact-impact, fatigue and corrosion are important factors initiating rail track degradation from the beginning, while corrosion attracts far less attention than other issues. Direct corrosion cost due to railway corrosion in China was 18.88 billion RMB, so corrosion definitely deserves more attention. This work has reviewed studies focussing exclusively on rail corrosion, including corrosion forms, protection and detection technologies. General corrosion on large rail surface is not limiting, while crevice corrosion between rail and liner, resulting in thinning of rail foot, is regarded significant but overlooked. Moreover, reciprocating micro-motion between rail foot and liner mechanically assists the ongoing of crevice corrosion. However, it was mentioned in very few reports and not investigated extensively. Coating and surface modification may be applied for mitigation of rail track corrosion. The weakness of coating is poor mechanical properties, while surface modification, including thermal spraying and laser cladding, may be a better way. Development of novel steel is another effective method, but loss of mechanical properties becomes obstacles for practical applications. Ultrasonic and infrared have been applied for detection, while more advanced technologies are promising. Suggestions are made on specific research topics in this field.

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The formation of martensite during the propagation of fatigue cracks in pearlitic rail steel

Cited by 28 publications

References 32 publications

Effect of Al2O3 in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

Effect of Al2O3 in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

Fatigue crack propagation behavior of multiphase microstructure in a quenched and partitioned medium‐carbon bainitic steel

Corrosion of rail tracks and their protection

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