1.College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China 2.Special Steel Institute, Central Iron and Steel Research Institute, Beijing 100081, China 3.School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
Cite this article:
YU Feng,CHEN Xingpin,XU Haifeng,DONG Han,WENG Yuqing,CAO Wenquan. Current Status of Metallurgical Quality and Fatigue Performance of Rolling Bearing Steel and Development Direction of High-End Bearing Steel. Acta Metall Sin, 2020, 56(4): 513-522.
This paper reviewed the development history of the first generation bearing steel GCr15, the second generation bearing steels M50 and M50NiL, and the third generation bearing steels Cronidur30 and CSS-42L. The fourth generation bearing alloy characterized by light weight is put forward. Based on the analysis of metallurgical quality and fatigue properties of traditional bearing steel, the direction of metallurgical quality control of bearing steel with fine quality and homogenization of large particle inclusions and carbide was proposed, and the contact fatigue control mechanism of bearing steel and two different anti-fatigue mechanisms of carbide control were revealed. According to the latest development of quality control technology and quantitative characterization technology for traditional bearing steel GCr15, the development direction of quality control for high-end bearing steel is proposed. Through the research on the overall heat treatment technology and surface carburizing technology of superfine matrix and carbide of bearing steel GCr15 and CSS-42L steel, the double heat treatment and surface superhardening heat treatment are innovatively developed, which can increase the contact fatigue life of bearing steel GCr15 at room temperature to 5 times and more than 10 times, respectively. Finally, it is pointed out that the application of quantitative inspection and testing technology is an important guarantee for high-performance bearing steel with good metallurgical quality and high performance.
Fig.1 Carbide microstructure of the carburizing layer (a) and gradient distribution of hardness (b) of G13Cr14Co12Mo5Ni2 steel
Fig.2 SEM images of G30Cr15MoN (a) and 440C (b) stainless bearing steels
Process
L10
L50
b
107 cyc
107 cyc
BOF+LF+RH
1.07
3.34
1.66
Argon shield atmosphere ESR
3.56
11.92
1.56
VIM+VAR
5.47
16.37
1.72
Table 2 Contact fatigue properties of GCr15 by different processes
Fig.3 Cast microstructures of 8Cr4Mo4V steel produced by electroslag remelting continuous directional solidification (ESR-CDS) (a) and VIM+VAR (b) processes
Fig.4 Carbides of 9Cr18Mo steel produced by ESR-CDS (a) and ESR (b) processes
Fig.5 Effect of new heat treatment on microstructure refinement of M50 bearing steel(a) coarse microstructure before new heat treatment(b) homogenized and refined microstructure after new heat treatment
Fig.6 Single quenched (SQ) microstructure (a) and refined microstructure processed by double quenching (DQ) (b) of GCr15 steel
Fig.7 Influence of heat treatments on contact fatigue life of bearing steel GCr15 by DQ (a) and special heat (SH) (b) treatments
Fig.8 Non-metallic inclusion detection technology
Fig.9 Distribution of inclusions detected by ASPEX automatic inclusion analyzer
Fig.10 Schematics of flat-washer (a) and ball-on-rod (b) RCF rigs (RCF—rolling contact fatigue)
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