Microstructure evolution of rail steels under different dry sliding conditions: A comparison between pearlitic and bainitic microstructures

Chen, Yuda; Ren, Ruiming; Pan, Jinzhi; Pan, Rui; Zhao, Xiujuan

doi:10.1016/j.wear.2019.203011

Cited by 13 publications

(6 citation statements)

References 27 publications

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“…[11][12][13] Contrary to these studies, many others asserted that the bainitic microstructure showed excellent wear resistance. [14][15][16][17] As far as fatigue resistance and ratcheting are concerned, most of the papers agree. Bainitic steels were found to have higher yield strength, fatigue strength and hardness compared to pearlitic steels; [18][19][20][21][22] furthermore, the fracture toughness of bainitic steels is almost double than in pearlitic steels.…”

Section: Introductionmentioning

confidence: 85%

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Numerical study about the effect of bainitic traces on plasticity in ferritic-pearlitic railway wheels

Zani

Chaise

Ghidini

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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Wheel microstructure significantly affects railway wheel performances. Although wheel microstructure traditionally consists of pearlite-ferrite, it is possible to detect some intermediate structures traces, for instance bainite, generated during the thermal treatment process. The difference in mechanical properties between pearlite and bainite causes stress and strain incompatibilities at their interface, and this gives rises to early crack initiation and propagation. This paper aims at investigating the presence of bainitic traces in a ferritic-pearlitic microstructure of a railway wheel through semi-analytical and numerical finite element simulations. The effect of bainitic spot shape, dimension and distribution is studied as well as stress and plastic strain in the proximity of the heterogeneities is analysed. The radius-interaxis ratio parameter, defined as the ratio between the bainitic spots radiuses and the distance between two neighbouring spots centres, is introduced to study the effect of circular-sectioned bainitic spots on the steel plasticity. It is observed that the bainitic traces form regions subjected to overstress and overstrain in the ferritic-pearlitic matrix and that the area of the bainitic spots influences the size of these regions. The bainitic spot distribution is found out to increase further the overstrain in case the radius/interaxis ratio is higher than 0.2, corresponding to about 11% of bainite in the ferritic-pearlitic matrix. Beyond this threshold value, bainite traces can compromise both RCF and wear response.

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Section: Introductionmentioning

confidence: 85%

“…11–13 Contrary to these studies, many others asserted that the bainitic microstructure showed excellent wear resistance. 14–17…”

Section: Introductionmentioning

confidence: 99%

Numerical study about the effect of bainitic traces on plasticity in ferritic-pearlitic railway wheels

Zani

Chaise

Ghidini

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Similarly, even though extensive sliding and rolling wear investigations on bainitic and pearlitic rails have been carried out during past decades, there is no common conclusion on whose wear performance is better. The results of previous studies [27,[29][30][31][32][33][34][35][36][37] are provided in Appendix A. It indicates that the good wear resistance of bainitic rail steels partially depends on the rail grades (hardness) of the pearlitic rail steel considered in the comparison.…”

Section: Introductionmentioning

confidence: 98%

Comparison of wear and rolling contact fatigue behaviours of bainitic and pearlitic rails under various rolling-sliding conditions

Guo

Maiorino

et al. 2020

Wear

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Rolling-sliding wear experiments were performed to investigate the wear and rolling contact fatigue (RCF) behaviours of a premium pearlitic rail (PH), a carbon-free bainitic rail (BH) and two standard pearlitic rails (U71Mn and U75V). The wear regime and RCF damage evolution of the PH and BH materials in terms of Tγ/A (i.e. creepages and contact pressures) were compared and analyzed. The high-hardness BH steel presented a wear resistance similar to U71Mn and U75V rail materials, whereas lower wear rate was shown by the PH steel. Concerning the RCF performance, the damage of BH steel (comparable to U75V) was more severe than that of PH steel (comparable to U71Mn). Finally, with the increase in creepages and pressures, the wear and RCF damage of both PH and BH steels increased. These information could provide a guide in choosing rail materials and in development of bainitic rails.

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“…As for the bainitic steel, several studies mainly focused on the comparison of the wear resistance [ 14 , 15 , 16 , 17 , 18 , 19 ] and RCF [ 3 , 15 , 16 , 20 ] between bainitic steels and pearlitic steels under the same working condition. However, the results were very contradictory.…”

Section: Introductionmentioning

confidence: 99%

“…However, the results were very contradictory. Some researchers believed that the improving wear resistance of bainitic steels was due to the surface microstructural transformation during wear process [ 19 ]. The transformation induced plasticity (TRIP) effect and the larger tolerance of degree of plastic strain [ 17 , 21 ] contributed to the increase in wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios

Liu

Zhang

et al. 2020

Materials

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This study aims to deeply understand the effect of contact stress and slip ratio on wear performances of bainitic rail steels. The results showed that the wear loss increased as the contact stress and slip ratio increased. Based on the surface damage morphology and microstructural analyses, it revealed that the rolling contact fatigue wear mechanism played a significant role under the low slip ratio, but the dominant wear mechanism transferred to the abrasive wear at the high slip ratio. Meanwhile, the bainitic steel specifically presented worse wear resistance under the abrasive wear mode. Compared with the influence of a slip ratio, the increase in contact stress led to severer plastic flows and contributed to the propagation of cracks. In addition, the contact stress and slip ratio had the opposite effect on the friction coefficient, that is, the friction coefficient of bainitic steels behaved the inverse proportion with the contact stress, but positive proportion with the slip ratio. At last, the increase in slip ratio had more significant effect on the reduction of retained austenite (RA) than the enlargement of contact stress due to the fact that the RA would probably be removed before the martensitic transformation occurred under the abrasive wear mechanism.

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Microstructure evolution of rail steels under different dry sliding conditions: A comparison between pearlitic and bainitic microstructures

Cited by 13 publications

References 27 publications

Numerical study about the effect of bainitic traces on plasticity in ferritic-pearlitic railway wheels

Numerical study about the effect of bainitic traces on plasticity in ferritic-pearlitic railway wheels

Comparison of wear and rolling contact fatigue behaviours of bainitic and pearlitic rails under various rolling-sliding conditions

Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios

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