Deformation-induced amorphization and austenitization in white etching area of a martensite bearing steel under rolling contact fatigue

Su, Yun-Shuai; Li, Shuxin; Lu, Siyuan; Shu, Xuedao

doi:10.1016/j.ijfatigue.2017.08.022

Cited by 25 publications

(14 citation statements)

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“…The WEA present an amorphous feature. The sizes of the matrix near the WEA were found from approximately 100 nm to 600 nm and the WEA filled with the size of 30 nm particles, as described in Ref [4]. Fig.…”

Section: Ebsd Inspectionmentioning

confidence: 53%

“…An amorphous-like region was also presented in WEA except the nanocrystallites [9,10]. We have provided the evidence for an amorphous phase exist in the WEA [3,4].…”

Section: Introductionmentioning

confidence: 57%

“…3(a). Besides, martensite α', austenite γ, and carbide θ were indexed in the WEA [4], which is also different with the SAD pattern in the matrix.…”

Section: Tem Microstructurementioning

confidence: 91%

“…Plastic deformation is highly localized into a narrow region at both contact surface and subsurface until the number of cycles reaches a certain level. When inspecting cross-sections of failed bearings or samples after RCF using optical microscope, white etching matters such as white etching bands [1,2], white etching areas (WEAs) [3][4][5][6][7] and white etching layers (WELs) [8] are observed in different depths below the contact surface. These white microstructural changes are different from base materials in terms of compositions and hardness.…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 1(a) displays a typical WEA at the depth of 810 μm below the contact surface [4]. It has inclined to 45 degrees with the contact surface.…”

Section: Introductionmentioning

confidence: 99%

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Phase transformation in white etching area in rolling contact fatigue

et al. 2018

MATEC Web Conf.

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Abstract. 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.

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Section: Ebsd Inspectionmentioning

confidence: 53%

“…An amorphous-like region was also presented in WEA except the nanocrystallites [9,10]. We have provided the evidence for an amorphous phase exist in the WEA [3,4].…”

Section: Introductionmentioning

confidence: 57%

“…3(a). Besides, martensite α', austenite γ, and carbide θ were indexed in the WEA [4], which is also different with the SAD pattern in the matrix.…”

Section: Tem Microstructurementioning

confidence: 91%