Microstructure and fatigue properties of 17Cr2Ni2MoVNb gear steel after gas carburizing and low-pressure carburizing

Xue, Yanjun; Yan, Yue; Yu, Wantai; Dong, Mingzhen; Shi, Jie; Wang, Maoqiu

doi:10.1016/j.ijfatigue.2022.107314

Cited by 11 publications

(5 citation statements)

References 32 publications

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“…However, it seems that the presence of retained austenite is beneficial because, as a result of cyclic stresses, it is transformed into martensite, which was confirmed by the results of transmission electron microscopy examinations. These results are consistent with the results presented in [27], where carburized steel with a composition very similar to 1.6587 steel was tested. As a consequence of the mechanically induced phase transformation from austenite to martensite, it is evident that the austenite will eventually exhaust, and the mechanical energy will no longer be dissipated in this transformation.…”

Section: Discussionsupporting

confidence: 92%

Influence of Chemical Composition on Structure and Mechanical Properties of Vacuum-Carburized Low-Alloy Steels

Kochmański,

Chylińska,

Figiel

et al. 2024

Materials

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This study presents research results concerning the vacuum carburizing of four steel grades, specifically conforming to European standards 1.7243, 1.6587, 1.5920, and 1.3532. The experimental specimens exhibited variations primarily in nickel content, ranging from 0 to approximately 3.8 wt. %. As a comparative reference, gas carburizing was also conducted on the 1.3532 grade, which had the highest nickel content. Comprehensive structural analysis was carried out on the resultant carburized layers using a variety of techniques, such as optical and electron scanning, transmission microscopy, and X-ray diffraction. Additionally, mechanical properties such as hardness and fatigue strength were assessed. Fatigue strength evaluation was performed on un-notched samples having a circular cross-section with a diameter of 12 mm. Testing was executed via a three-point bending setup subjected to sinusoidally varying stresses ranging from 0 to maximum stress levels. The carburized layers produced had effective thicknesses from approximately 0.8 to 1.4 mm, surface hardness levels in the range of 600 to 700 HV, and estimated retained austenite contents from 10 to 20 vol%. The observed fatigue strength values for the layers varied within the range from 1000 to 1350 MPa. It was found that changing the processing method from gas carburizing, which induced internal oxidation phenomena, to vacuum carburizing improved the fatigue properties to a greater extent than increasing the nickel content of the steel.

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Section: Discussionsupporting

confidence: 92%

Influence of Chemical Composition on Structure and Mechanical Properties of Vacuum-Carburized Low-Alloy Steels

Kochmański,

Chylińska,

Figiel

et al. 2024

Materials

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“…After carburization, the surface of gear steel obtains a higher hardness, wear resistance, and fatigue strength, and the core part has a good toughness. But the conventional carburizing treatment always needs a long time to be carried out [3][4][5][6][7]. According to the Harris equation [8], when obtaining the same largeness of the carburized layer, increasing the carburizing temperature can significantly shorten the time required for carburization.…”

Section: Introductionmentioning

confidence: 99%

Effect of Precipitated Particles on Austenite Grain Growth of Al- and Nb-Microalloyed 20MnCr Gear Steel

Zhu,

Fan,

Lian

et al. 2024

Metals

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The paper deals with the effect of the morphology characteristics, grain size, and the volume fraction of AlN- and NbC-precipitated particles on the prior austenite grain growth behavior in the Al- and Nb-microalloying 20MnCr gear steel during pseudo-carburizing heat treatments. The results indicate that the Nb addition in 20MnCr gear steel have a better effect on preventing austenite grain growth. The coarsening time after pseudo-carburizing in the Nb-microalloyed 20MnCr steel are improved by about 4 h compared with the Al-microalloyed steel. The precipitated particles coarsen and the number decreases with the pseudo-carburization temperature increasing, resulting in a reduction in the pinning pressure of the precipitated particles on the austenite grain boundaries. When the pseudo-carburization temperature reaches 1150 °C, the precipitated particles no longer have the ability to pin the austenite grain boundaries. In addition, the kinetics model for austenite grain growth under the process of the pinning and coarsening of the precipitated particles was established.

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“…) composition characteristics of Cr8 steel molds make the heat treatment process more demanding. Traditional methods such as induction hardening, flame hardening [10,11], and carburizing quenching are more prone to cracking defects in this mold [3,12]. Therefore, it is a challenge of significant practical engineering significance to develop new heat treatment process methods, which enhances the wear resistance and mechanical properties of high strength steel (cold-worked mold) represented by Cr8 steels to further extend the service life of the molds [13].…”

Section: Introductionmentioning

confidence: 99%

Control of the metallographic and mechanical properties of Cr8 cold-work die steel by laser continuous/dispersed quenching

Kuang,

Zheng,

Chen

et al. 2023

Pacific-Rim Laser Damage 2023: Optical Materials for High-Power Lasers

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Microstructure and fatigue properties of 17Cr2Ni2MoVNb gear steel after gas carburizing and low-pressure carburizing

Cited by 11 publications

References 32 publications

Influence of Chemical Composition on Structure and Mechanical Properties of Vacuum-Carburized Low-Alloy Steels

Influence of Chemical Composition on Structure and Mechanical Properties of Vacuum-Carburized Low-Alloy Steels

Effect of Precipitated Particles on Austenite Grain Growth of Al- and Nb-Microalloyed 20MnCr Gear Steel

Control of the metallographic and mechanical properties of Cr8 cold-work die steel by laser continuous/dispersed quenching

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