On the role of chemical banding and austenite grain size in microstructure evolutions and phase transformation kinetics of gear steels

Zhao, Yue; Chen, Yinli; Zuo, Xiaojian; Yu, Wei; Qiu, Lei; Luo, Zhuzheng; Sun, Jiquan

doi:10.1016/j.conbuildmat.2022.129305

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…The samples were selected from the raw materials provided by the manufacturer, and their chemical compositions were analyzed by using a direct-reading spectrometer (Table 1). In addition, the continuous cooling curve of 22CrMoH steel revealed the Ac1 temperature of 760 • C, Ac3 temperature of 840 • C, and austenitizing temperature of 870 • C [21]. It implied that the chemical compositions of the experimental specimens and the heat treatment process were in compliance with the requirements of the actual production process.…”

Section: Experimental Materials and Methodsmentioning

confidence: 82%

“…t = 0.5 s. When the heat source was loaded onto the surface of the test block, its temperature increased rapidly to 1950 K, which is higher than the Ac3 temperature of the 22CrMoH steel[21]. Figure3b,c depicts that the peak temperature of the surface of the test block remains stable at approximately 1880 K at t = 3-9 s, and this could be approximated to be the quasi-steady-state stage.…”

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confidence: 94%

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Effect of Scanning Electron Beam Pretreatment on Gas Carburization of 22CrMoH Gear Steel

Jiang,

Qu,

Liu

et al. 2024

Coatings

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22CrMoH was selected for the gear steel material in this work, and the temperature field change in the scanning electron beam was analyzed to determine the optimal scanning parameters and explored the effect of scanning electron beam pretreatment (Abbreviated as: SEBP) on gas-carburizing (GC) efficiency and organizational properties of gear steel. The results showed that the scanning electron beam caused the material to form a thermally deformed layer 110 μm thick, and it promoted the adsorption of carbon atoms on the surface and their inward diffusion. Under the same gas-carburizing conditions, the carburizing efficiency was improved, and the thickness of the carburized layer increased from 0.78 to 1.09 mm. Furthermore, the hardness of the GC specimens with the SEBP increased from 615 to 638 HV0.05 at 0.1 mm of the sample surface, whereas the hardness of the cross-sectional region decreased gradually, indicating that the scanning electron beam enhanced the adhesion between the carburized layer and matrix zone. A comparative analysis of the microstructures of the GC specimens with and without the SEBP showed that the carbide particles in the surface layer of the samples become smaller and that of volume fraction of residual austenite reduced in size. In terms of the mechanical properties, the surface friction coefficient decreased from 0.87 to 0.46 μ and the GC specimen with the SEBP had a higher cross-sectional hardness gradient. Its friction coefficient was reduced from approximately 0.8 to almost 0.45 μ, and the wear amount of the specimens with SEBP was 47.7% of that of the matrix specimens.

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Section: Experimental Materials and Methodsmentioning

confidence: 82%

mentioning

confidence: 94%

Effect of Scanning Electron Beam Pretreatment on Gas Carburization of 22CrMoH Gear Steel

Jiang,

Qu,

Liu

et al. 2024

Coatings

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Tribological and mechanical properties improvement of G20CrNiMo alloy via fabricating gradient composite layer through ultrasonic strengthening grinding process

Xiao,

Zhang,

Lin

et al. 2024

Materials Today Communications

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Effect of double quenching process on Microstructure and Properties of 20CrMoH Alloy Steel

Gao,

Ren,

et al. 2024

J. Phys.: Conf. Ser.

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This article investigates the influence of dual quenching process quenching temperature on the microstructure, hardness, and mechanical properties of 20CrMoH alloy steel through optical metallographic microscopy, Rockwell hardness tester, and universal mechanical testing machine. The results indicate that during the second quenching in the temperature range of 780-880 °C, with the increase of quenching temperature, the tensile strength of 20CrMoH steel shows a rapid increase trend, from 1250MPa to 1550MPa. At this time, the matrix structure gradually evolves from ferrite + bainite structure to bainite + martensite, which is also the main factor for its rapid increase in tensile strength; When the quenching temperature rises to above 850 °C, the influence of quenching temperature on the tensile strength decreases, and the tensile strength remains around 1550MPa. The secondary quenching temperature has little effect on the plasticity of the material. The overall reduction and elongation of the section under different quenching temperature conditions are at a similar level, with a reduction rate of 9% -12% and a stable reduction rate of 50% -60%, indicating good mechanical properties.

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On the role of chemical banding and austenite grain size in microstructure evolutions and phase transformation kinetics of gear steels

Cited by 3 publications

References 33 publications

Effect of Scanning Electron Beam Pretreatment on Gas Carburization of 22CrMoH Gear Steel

Effect of Scanning Electron Beam Pretreatment on Gas Carburization of 22CrMoH Gear Steel

Tribological and mechanical properties improvement of G20CrNiMo alloy via fabricating gradient composite layer through ultrasonic strengthening grinding process

Effect of double quenching process on Microstructure and Properties of 20CrMoH Alloy Steel

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