Nano- and Microhardness Distribution in the Carburized Case of Nb-Microalloyed Gear Steel

Chen, W.; He, Xiaofei; Yu, Wantai; Shi, Jie; Wang, M. Q.; Yao, Kefu

doi:10.1007/s11665-020-04992-7

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…Using transmission observation, FIB was used to cut small specimens for the transmission electron microscopy (TEMFEI Company, Hillsboro, OR, USA) test. The TEM and electron back scatter diffraction (EBSD) methods were also used to observe the cross-section of the GBF area of the fracture surface, after the fractured specimen was cut and prepared according to References [25,26].…”

Section: Methodsmentioning

confidence: 99%

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Very High Cycle Fatigue Properties of 18CrNiMo7-6 Carburized Steel with Gradient Hardness Distribution

Yang

Cheng

et al. 2021

Coatings

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As research of the high cycle fatigue of carburized gear steel could not meet the status quo of longer and longer service lives, research of very high cycle fatigue (VHCF) performance has become the focus of current research. The VHCF properties of case-hardening steel 18CrNiMo7-6 after being carburized with gradient hardness distribution were investigated by means of ultrasonic fatigue tests. The results showed that the carburized specimens with a case hardness of 705 HV and core hardness of 530 HV showed VHCF phenomenon, and the fatigue lives continuously increased to even 109 cycles as the stress amplitude decreased to about 500 MPa. Observations of the fracture surfaces of the fatigue specimens showed that the fatigue crack initiation sites were located in the transition area with the hardness at about 580 HV. It was found that the transition area had low VHCF properties, since the core did not show VHCF phenomenon, and the case had a higher hardness. A fine microstructure was observed in the granular bright facet (GBF) area, and the stress intensity factor ΔKGBF was measured to be 3.04 MPam−1/2. The 109 cycles fatigue life was predicted based on the inclusion size, and the 1010 cycles fatigue life was 490 MPa based on the prediction model.

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Section: Methodsmentioning

confidence: 99%

“…to observe the cross-section of the GBF area of the fracture surface, after the fractured specimen was cut and prepared according to References [25,26].…”

Section: Microstructure and Hardnessmentioning

confidence: 99%

Very High Cycle Fatigue Properties of 18CrNiMo7-6 Carburized Steel with Gradient Hardness Distribution

Yang

Cheng

et al. 2021

Coatings

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“…Relative carbide frequencies of samples at each process calculated by image-pro software: (a) 17-QT, (b) 17-QTCT, (c) 17-QCT, (d) 20-QT, (e) 20-QTCT, (f) 20-QCT.20Cr2Ni4A and 17Cr2Ni2MoVNb steels undergo a change in chemical composition and microstructure from the surface to the matrix due to the change in C content after carburization. Equation (2) allows to calculate the Ms point of the core and the carburized surfaces[23]. The results show that the Ms points of the carburized surfaces of 17Cr2Ni2MoVNb and 20Cr2Ni4A steels are (58 ± 10) • C and (42 ± 10) • C, respectively.…”

mentioning

confidence: 99%

Effect of Cryogenic Treatment on Microstructure, Mechanical Properties and Distortion of Carburized Gear Steels

Yan

Liu²,

Luo

et al. 2021

Metals

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The effects of cryogenic treatment and low temperature tempering on the microstructure, mechanical properties and distortion of the 20Cr2Ni4A and 17Cr2Ni2MoVNb carburized gear steels were investigated. The results showed that the case hardness of the experimental steels was increased after the cryogenic treatment, due to the decrease of the retained austenite content and the precipitation of the tiny carbides. The wear resistance of the two steels after cryogenic treatment was improved, although the wear mechanisms were different for 17Cr2Ni2MoVNb and 20Cr2Ni4A steels. The distortion of the Navy C-ring specimens underwent shrinkage before expansion during the cryogenic process, and the distortion of 17Cr2Ni2MoVNb steel was smaller than that of 20Cr2Ni4A steel.

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Corrosion and abrasion behavior of high-temperature carburized 20MnCr5 gear steel with Nb and B microalloying

Feng

Jiang

et al. 2023

Journal of Materials Research and Technology

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Nano- and Microhardness Distribution in the Carburized Case of Nb-Microalloyed Gear Steel

Cited by 4 publications

References 19 publications

Very High Cycle Fatigue Properties of 18CrNiMo7-6 Carburized Steel with Gradient Hardness Distribution

Very High Cycle Fatigue Properties of 18CrNiMo7-6 Carburized Steel with Gradient Hardness Distribution

Effect of Cryogenic Treatment on Microstructure, Mechanical Properties and Distortion of Carburized Gear Steels

Corrosion and abrasion behavior of high-temperature carburized 20MnCr5 gear steel with Nb and B microalloying

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