white etching area
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2018 ◽  
Vol 84 (868) ◽  
pp. 18-00034-18-00034
Author(s):  
Susumu MIYAKAWA ◽  
Yoshiro NISHIMURA ◽  
Satoru NAKAZAWA ◽  
Nobuhiro SHIOYA

2018 ◽  
Vol 165 ◽  
pp. 11004
Author(s):  
Yun-Shuai Su ◽  
Shu-Xin Li ◽  
Si-Yuan Lu ◽  
Li-Biao Wan

Rolling contact fatigue (RCF) involves microstructural change in the subsurface of contact. The changed microstructure is generally termed as white etching area (WEA) as it appears white under optical microscope when etching in nital solution. WEA has been acknowledged as one of the primary failure modes in RCF since it causes severe local inhomogeneity of microstructure. It was reported that WEA consists of nano ferrites as martensite grains and carbides are significantly refined in the WEA. Some carbides are dissolved. In some cases, an amorphous-like structure was occasionally observed in the WEA, indicating that phase transformation may possibly occur. The WEAs were studied by using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Electron back scattered diffraction (EBSD). The result showed that WEA is dominated with an amorphous phase with martensite, austenite and carbides embedded interior. A distinct interface between the matrix and the WEA was present. In addition to grain refinement down to nanometers, phase transformation including amorphization and austenitization happened in WEAs. The content of austenite was increased from 2% in the matrix to 20% in the WEA. The analysis showed that phase transformation is controlled by plastic deformation mechanism.


2015 ◽  
Vol 2015 (0) ◽  
pp. _S1160104--_S1160104-
Author(s):  
Susumu MIYAKAWA ◽  
Yoshirou NISHIMURA ◽  
Satoru NAKAZAWA ◽  
Nobuhiro SHIOYA

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