Effects of double quenching on fatigue properties of high carbon bearing steel with extra-high purity

Cao, Zhaoxi; Shi, Zhi‐Guo; Yu, Feng; Sugimoto, Koh‐ichi; Cao, Wenquan; Weng, Yuqing

doi:10.1016/j.ijfatigue.2019.06.036

Cited by 28 publications

(23 citation statements)

References 17 publications

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“…The grain size was significantly reduced by 75% after the RQT process comparing with previous research [34,35] in which the result was 49% and 48%, respectively. The same phenomenon was also found in the literature [21,22]. There are a large number of defects in the microstructure after CQT process, which is beneficial to the nucleation of austenite grains during reheating-quenching process.…”

Section: Variation In Grain Sizesupporting

confidence: 85%

“…Early studies confirmed the positive effect of double quenching and tempering heat treatment on the fatigue resistance of steel [19,20]. Over nearly a decade, scholars further studied the microstructures and mechanical properties of steels with different carbon content after double quenching and tempering [21,22]. The findings of these studies suggested that the substantial refinement of austenite grains was the reason for the remarkable improvement of impact toughness, and the yield strength and tensile strength were also improved.…”

Section: Introductionmentioning

confidence: 91%

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Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi2MoA Bearing Steel

Zhou

Wei

Liu

2021

Metals

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Hot rolling can improve the mechanical properties after heat treatment by improving the microstructure. The effect of hot rolling (HR) deformation on the microstructural transformation of G20CrNi2MoA bearing steel in the subsequent CQT (carburizing-quenching and tempering) and RQT (reheating-quenching and tempering) processes was studied. The results indicate that the austenite grain size decreased by 20% after 45% hot rolling reduction, and the number of large-angle grain boundaries increased due to the recovery and recrystallization induced by hot deformation. The refinement effect of hot deformation on austenite grains was retained after dual austenitizing, and the large-angle grain boundaries and massive dislocation in the grains caused by hot deformation promoted the diffusion of carbon atoms during carburization, resulting in a higher surface carbon concentration. The refined grains and higher carbon concentration affected the volume fraction and size of undissolved carbides in RQT specimens. When the initial hot rolling reduction reached 45%, the average particle size of carbides decreased by 40%, and the area volume fraction increased by 37%. The Vickers hardness increased, but the friction coefficient and wear rate were significantly reduced with the increase in the initial hot rolling reduction. The main reasons for the improved wear resistance were fine grains, superior carbide distribution and high hardness.

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Section: Variation In Grain Sizesupporting

confidence: 85%

Section: Introductionmentioning

confidence: 91%

Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi2MoA Bearing Steel

Zhou

Wei

Liu

2021

Metals

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“…It was also demonstrated that the RCF life (L10) could be significantly increased by 5 folds by the refinement of both prior austenite grain size and the carbide size [8,11].…”

Section: Introductionmentioning

confidence: 97%

Carburization induced extra-long rolling contact fatigue life of high carbon bearing steel

Cao

Liu

et al. 2020

International Journal of Fatigue

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“…For instance, the bearing steel has strict restrictions on the total oxygen less than 10 ppm and the inclusion size smaller than 15 μm, to guarantee its impact toughness and fatigue property. [1][2][3][4] As the last refractory container of molten steel, tundish is an appropriate place for the removal of inclusions, due to its stable dynamic conditions for inclusion flotation. During the past decades, many studies were carried out to deeply clean the liquid steel in tundish, through optimizing the flow field using dams, weirs, and turbulence inhibitors.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Flow Behaviors in a Swirling Flow Tundish for the Deep Cleaning of Molten Steel

Huang

Chang

Zou

et al. 2021

steel research int.

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A swirling flow tundish is developed to deeply clean the liquid steel through enhancing the coalescence of inclusions. The swirling flow is generated using the gravitational energy of liquid steel, without any external energy. Inclusions will gather to the center of the swirling flow by centripetal force, due to the density difference between inclusions and liquid steel. Thus, small inclusions can coalesce into larger ones, and then float to the top surface by their self‐buoyance. Physical experiments are carried out in a 1/2.5 scale five‐strand tundish, to investigate flow characteristics in the swirling flow tundish, compared with that in the tundish with a conventional turbulent inhibitor. Numerical modeling is developed to evaluate the swirling strength of liquid flow in swirling chambers in different sizes, which is related to the effect of inclusion coalescence. The results reveal that swirling chamber in diameter of 700 mm produces the highest swirling flow strength. The swirling system can not only improve the flow field, with a 21.75% reduction of dead volume, but also uniform flow characteristics at each strand. In addition, the swirling chamber inhibits the normal impact of the reversed flow on tundish surface, which is beneficial for remaining a stable slag layer.

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Effects of double quenching on fatigue properties of high carbon bearing steel with extra-high purity

Cited by 28 publications

References 17 publications

Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi2MoA Bearing Steel

Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi2MoA Bearing Steel

Carburization induced extra-long rolling contact fatigue life of high carbon bearing steel

Modeling of Flow Behaviors in a Swirling Flow Tundish for the Deep Cleaning of Molten Steel

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