Effect of refined cementite on the microstructure and properties of nanostructured bainitic bearing steel

Qin, Yuman; Li, Xuemei; Lv, Bo; Long, Xiaoyan; Yang, Zhinan; Zhang, Fucheng; Li, Yanguo; You, Leilei

doi:10.1016/j.msea.2020.140220

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…Moreover, the smaller the θ particle, the higher the pinning effect 29,30) . Since SUJ2-MnCr contains less C than the other two steels, as mentioned in section 3.2, SUJ2-MnCr was found to contain large fraction of fine θ particles, which effectively pinned the γ grain boundaries during the GBA treatment.…”

Section: Morphology Of γ Grain Size and Area Fraction Of Retained γ P...mentioning

confidence: 99%

Effect of Rolling and Alloying Elements on the Impact Properties of Hypereutectoid Steels

Tokunaga,

Minamino,

Yamamoto

et al. 2024

ISIJ Int.

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In this study, to develop steel with high strength and ductility, steels are designed based on JIS-SUJ2 hypereutectoid steel by controlling the contents of the alloying elements Cr and Mn. The steels are subjected to two types of specially designed heat treatment, i.e., "grain boundary amelioration (GBA)" treatment, with and without rolling. The effects of the alloy type and rolling on the microstructure and impact properties are investigated. High impact values over 50 J/cm 2 were achieved compared to those of conventional steels by the significant refinement of γ grains with GBA treatment. All the steels exhibit transgranular fracture, and no intergranular fracture was observed. This indicates that the proposed heat treatment achieved the suppression of intergranular fracture by inhibiting the formation of θ particles on the grain boundaries and by refining the prior γ grains. Moreover, it has been suggested that the impact values were strongly affected by the C content in the matrix which is controlled by the alloying element and by the heat treatment. As the C content increases, hardness and fraction of the retained γ phase increase, which leads to the decrease in impact value. In samples where prior γ grains were extremely fine and θ particles were fine, area fraction and circularity of the θ particles did not have a significant effect on the impact values.

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Section: Morphology Of γ Grain Size and Area Fraction Of Retained γ P...mentioning

confidence: 99%

Effect of Rolling and Alloying Elements on the Impact Properties of Hypereutectoid Steels

Tokunaga,

Minamino,

Yamamoto

et al. 2024

ISIJ Int.

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show abstract

“…Excess undissolved carbides in the steel will increase the brittleness and damage the mechanical properties. However, the undissolved carbides can provide many hard points for the steel to enhance hardness and improve wear resistance [16][17][18]. Furthermore, the undissolved carbides can also pin the grain boundaries and inhibit the growth of grains.…”

Section: Microstructure Analysismentioning

confidence: 99%

Effect of Austempering on Mechanical Properties of Nb/V Microalloyed Bainitic Bearing Steel

et al. 2022

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In this study, a multi-element microalloyed GCr15Si1MoNbV bainitic bearing steel was designed by adding trace amounts of Nb and V. The bainite/martensite/retained austenite/undissolved carbide multiphase bearing steel with a short heat-treated cycle and remarkable comprehensive mechanical properties was prepared via low-temperature austempering, which was compared with a traditional quenched and tempered martensitic microstructure. The results showed that the comprehensive mechanical properties of the low-temperature bainitic microstructure of the Nb/V microalloyed bearing steel were better than those of a traditional tempered martensitic microstructure. In addition, as the isothermal temperature increased, the impact toughness of experimental steel was significantly improved, and the hardness decreased slightly. The tensile strength was improved with the increase in isothermal time. As the isothermal temperature increased, the bainite content of the experimental steel rose, and the stability of the retained austenite enhanced due to more carbon atoms being partitioned into it. The research work in this paper made a preliminary exploration for the application of Nb/V microalloyed bainitic bearing steel in the bearing field and provided some basic data for reference.

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The effect mechanism of Si on the cementite growth behavior in Fe–Cr–C steel: first-principles calculations and experiments

Liang

Han

et al. 2022

J Mater Sci

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Effect of refined cementite on the microstructure and properties of nanostructured bainitic bearing steel

Cited by 10 publications

References 27 publications

Effect of Rolling and Alloying Elements on the Impact Properties of Hypereutectoid Steels

Effect of Rolling and Alloying Elements on the Impact Properties of Hypereutectoid Steels

Effect of Austempering on Mechanical Properties of Nb/V Microalloyed Bainitic Bearing Steel

The effect mechanism of Si on the cementite growth behavior in Fe–Cr–C steel: first-principles calculations and experiments

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