Evolution of White Etching Bands in 100Cr6 Bearing Steel under Rolling Contact-Fatigue
Evolution of White Etching Bands in 100Cr6 Bearing Steel under Rolling Contact-Fatigue
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DOI：
10.3390/met9050491
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发表时间：
2019-04
期刊：
影响因子：
2.9
通讯作者：
Hanwei Fu;P. Rivera-Díaz-del-Castillo
中科院分区：
文献类型：
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作者：
Hanwei Fu;P. Rivera-Díaz-del-Castillo
在滚动接触疲劳轴承内圈的亚表面形成白色蚀刻带(网)，表现出不利于轴承寿命的组织腐蚀。尽管在轴承钢中观察到网状物已有近70年的历史，但对网状物形成的了解仍然有限，而且大多是定性的。因此，本研究进行了一项系统的研究，以揭示网络相对于接触循环次数的演变。通过预定循环次数的全尺寸轴承RCF试验再现在不同阶段形成的腹板。采用光学显微镜、微压痕、扫描和透射电子显微镜、原子力显微镜等多尺度表征技术，对织构的发展和微观结构进行了研究。在没有黑色蚀刻区的情况下发现了网状结构，这是由于热处理造成的。随着循环次数的增加，网络的数量密度和所有三个维度都在增长，并且它们的形成受到最大剪应力分量的控制。含有位错晶胞的网状物中的铁素体带在材料中表现出累积的塑性应变。根据表征结果，对RCF下塑性应变的演化进行了量化。
The formation of white etching bands (WEBs) occurs at the subsurface of rolling contact-fatigued bearing inner rings, exhibiting microstructural decay detrimental to bearing life. Despite the fact that WEBs have been observed in bearing steels for nearly 70 years, the understanding of WEB formation is still limited and mostly qualitative. Therefore, a systematic investigation is carried out in this research to reveal the evolution of WEBs with respect to the number of contact cycles. WEBs formed at different stages are reproduced by full-scale bearing RCF tests with predetermined numbers of cycles. Multi-scale characterisation techniques such as optical microscopy, micro-indentation, scanning and transmission electron microscopy and atomic force microscopy are conducted on the microstructural alterations to study the development and microstructure of WEBs. WEBs are found in the absence of dark etching regions which is attributed to the heat treatment. With an increasing number of cycles, WEBs grow in number density and in all three dimensions, and their formation is found to be controlled by the maximum shear stress component. Ferrite bands within WEBs that contain dislocation cells manifest accumulated plastic strain in the material. Based on the characterisation results, the evolution of plastic strain under RCF is quantified.