Effects of grain size gradients on the fretting wear of a specially-processed low carbon steel against AISI E52100 bearing steel
Effects of grain size gradients on the fretting wear of a specially-processed low carbon steel against AISI E52100 bearing steel
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DOI：
10.1016/j.wear.2018.07.014
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发表时间：
2018-10-15
期刊：
影响因子：
5
通讯作者：
Mondal, K.
中科院分区：
文献类型：
--
作者：
Rai, Prabhat K.;Shekhar, S.;Mondal, K.
研究了不同晶粒度分布对低碳钢扁平试件与轴承钢球微动磨损行为的影响。低碳钢的组织结构发生了变化，形成了表面细小、内部粗大的梯度组织。这种新的表面处理方法包括一种多步骤的技术，即在表面压缩一系列硬化的钢棒，然后重新结晶这些表面。通过改变变形后的热处理周期，在不同深度观察到的四种相似的显微组织在钢的表面再现。用扫描电子显微镜(SEM)、能谱仪(EDS)、电子背散射衍射仪(EBSD)和光学轮廓术对磨损样品进行了表征。与粗晶钢相比，细晶粒钢在所有载荷下的耐磨性最高。双峰组织的耐磨性较高，这是由于存在细小的和应变的晶粒。细晶组织的高耐磨性归因于与晶界区域较高的相互作用程度。不同显微组织表面的磨损行为可以很好地与不同深度形成的相似类型的组织相关联。
The purpose of this work was to study effects of different grain size distributions on fretting wear behavior of a low carbon steel flat specimen against a bearing steel ball. The grain structure of the low carbon steel was varied to produce a gradient microstructure consisting of fine grains at the surface and coarse grains in the interior. The novel method of surface treatment involved a multi-step technique of compressing a series of hardened steel rods on the surface and then recrystallizing those surfaces. Four similar kinds of microstructures as observed at different depths were reproduced on the surface of the steel samples by changing the heat treatment cycles after deformation. Worn specimens were characterized using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), Electron back scattered diffraction (EBSD) and optical profilometry. Wear resistance at all the loads was found to be highest for the fine-grained steel specimen compared to that of the coarser-grained specimens. The wear resistance of a bimodal microstructure was considerably higher due to the presence of fine as well as strained grains. Higher wear resistance for the finer grain microstructures was attributed to higher degree of interaction with the grain boundary regions. The wear behavior at the surfaces with different microstructures could well be correlated with similar types of microstructures developed at different depths.