Uncovering the white etching area and crack formation mechanism in bearing steel

被引：7

作者：

Nikolic, Ksenija ^{[1
,2
,6
]}

Ferreira, Vitoria Mattos ^{[3
]}

Malet, Loic ^{[4
]}

Depover, Tom ^{[5
]}

Verbeken, Kim ^{[5
]}

Petrov, Roumen H. ^{[1
,3
]}

机构：

[1] Univ Ghent, Dept Electromech Syst & Met Engn, Technol Pk 46, B-9052 Ghent, Belgium

[2] SIM Vzw, Technol Pk 48, B-9052 Ghent, Belgium

[3] Delft Univ Technol, Dept Mat Sci & Engn, Mekelweg 2, NL-2600 Delft, Netherlands

[4] Ecole Polytech Bruxelles, Campus Solbosch,Ave FD Roosevelt 50, B-1050 Brussels, Belgium

[5] Univ Ghent, Dept Mat Text & Chem Engn, Technol Pk 46, B-9052 Ghent, Belgium

[6] Technol Pk 46, B-9052 Ghent, Belgium

来源：

MATERIALS CHARACTERIZATION | 2023年 / 197卷

关键词：

Rolling contact fatigue; White etching cracks; White etching area; Bearing steel; EBSD; FIB; TEM; ROLLING-CONTACT FATIGUE; MICROSTRUCTURAL ALTERATIONS; 100CR6; BEARING; NONMETALLIC INCLUSIONS; THRUST BEARING; REDISTRIBUTION; WEC;

D O I：

10.1016/j.matchar.2023.112659

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure of a damaged bearing from the field was characterized in this work with the intention to better understand microstructural features behind formation of White Etching Cracks (WEC) in bearings. Microstructural characterization of the altered white etching area (WEA) involved conventional electron backscattered diffraction (EBSD), followed by transmission electron microscopy (TEM), and transmission Kikuchi diffraction (TKD). In addition, automated crystallographic orientation mapping in TEM was performed on lamellae from selected regions of the WEA extracted via focus ion beam milling. The results revealed that the orientation of detectable grains within WEA is similar to that of the vicinal bulk material. WEA consists of small spherical grains (average 30 nm) and the orientation of the grains varied significantly in the deformed zone, suggesting that recrystallization had occurred. The interface between bulk material and the deformed zone is very sharp. Furthermore, needle-like grains, most likely originating from the zone undergoing only modest levels of severe plastic deformation, occurred in WEA. The occurrence of different grain sizes in WEA and incomplete plastic deformation strongly support the hypothesis of WEC formation via severe plastic deformation followed by recrystallization.

引用

页数：9