Soft novel form of white-etching matter and ductile failure of carbide-free bainitic steels under rolling contact stresses
Soft novel form of white-etching matter and ductile failure of carbide-free bainitic steels under rolling contact stresses
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DOI：
10.1016/j.actamat.2016.09.012
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发表时间：
2016-12
期刊：
影响因子：
9.4
通讯作者：
W. Solano-Alvarez;E. Pickering;M. Peet;K. Moore;J. Jaiswal;A. Bevan;H. Bhadeshia
中科院分区：
文献类型：
--
作者：
W. Solano-Alvarez;E. Pickering;M. Peet;K. Moore;J. Jaiswal;A. Bevan;H. Bhadeshia
对于1C-1.5Crwt%等常规轴承钢在反复承受滚动接触应力时，硬白蚀刻区的形成已做了大量的工作。这些区域是横跨微裂纹表面的局部机械磨损和混合的结果，这些磨损细化了局部结构并迫使渗碳体溶解。这种白色蚀刻物质通常与脆性现象有关，因为其硬度可以超过1100 HV。相反，贝氏体铁素体和残余奥氏体的无碳化物混合物在相同的载荷下，出人意料地发现，没有形成硬质材料的特征斑块，反而在磨损区显示出延性迹象。这里介绍的工作表明，在无碳化物贝氏体中形成的白色蚀刻区比它们周围的环境更好，无论它们是用于轴承应用的硬质纳米结构贝氏体，还是用于制造钢轨的钢。首次使用了先进的表征工具来了解碳在形成过程中的再分布。人们对软白蚀材料的浓厚兴趣源于这样一种想法，即它可以减少风力涡轮机变速箱轴承的早期失效和钢轨的白蚀刻层磨削。
There has been a great deal of work on the formation of hard white-etching regions in conventional bearing steels such as 1C-1.5Cr wt% when subjected repeatedly to rolling contact stresses. The regions are a consequence of localised mechanical attrition across microcrack faces and mixing, which refine the local structure and force cementite to dissolve. This white-etching matter is often associated with brittle phenomena because the hardness can exceed 1100 HV. In contrast, carbide-free mixtures of bainitic ferrite and retained austenite when subjected to the same loading have been unexpectedly found not to develop the characteristic patches of hard material and to show instead signs of ductility in the attrited regions. The work presented here shows that the white-etching areas that develop in carbide-free bainite aresofterthan their surroundings, whether they are in hard nanostructured bainite destined for bearing applications or when the steel is designed for the manufacture of rails. Advanced characterisation tools were used for the first time to understand carbon redistribution during its formation. The deep interest about soft white-etching matter originates from the idea that it could lead to the reduction in premature failure of wind turbine gearbox bearings and white-etching layer grinding of rails.