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

•Double quenching heat treatment is applied for the microstructure control of the bearing steel of 100Cr6.•The rotated bending fatigue test and the rolling contact fatigue test are measured to reveal the double quenching effects on the fatigue properties of the bearing steel of 100Cr6.•Both prior au...

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Bibliographic Details
Published in:International journal of fatigue 2019-11, Vol.128, p.105176, Article 105176
Main Authors: Cao, Zhaoxi, Shi, Zhiyue, Yu, Feng, Sugimoto, Koh-ichi, Cao, Wenquan, Weng, Yuqing
Format: Article
Language:English
Subjects:
Bearing steel
Double quenching
Extra-high purity steel
Fatigue property
Inclusion characters
Weibull distribution
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Summary:•Double quenching heat treatment is applied for the microstructure control of the bearing steel of 100Cr6.•The rotated bending fatigue test and the rolling contact fatigue test are measured to reveal the double quenching effects on the fatigue properties of the bearing steel of 100Cr6.•Both prior austenite grain size and the carbide size are significantly refined, both of which are related to the enhanced rolling contact fatigue life of the double quenched 100Cr6. In this study, high carbon bearing steel of GCr15 (100Cr6) is applied to explore the double quenching effects on both rotated bending fatigue strength (RBF-strength) and rolling contact fatigue life (RCF-life). The RBF-strength and RCF-life is about 1000 MPa and 1.1 × 107 cycles under a maximum Hertzian stress of 4.5 GPa for the single quenched and tempered specimens but about 1030 MPa and 5.6 × 107 cycles for the double quenched and tempered specimens. The enhancement of RBF-strength and RCF-life are attributed to the increased impact toughness due to the refinements of both carbides and prior austenite grain size.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2019.06.036