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标 题： A STUDY OF MICROSTRUCTURE ALTERATION IN AISI 52100 BEARINGS DUE TO CLASSIC ROLLING CONTACT FATIGUE AND WHITE ETHING CRACK
关于AISI 52100轴承因经典滚动接触疲劳和白化裂纹导致的微观结构变化研究
作 者： Viktorija Smelova
A. Schwedt
L. Wang
W. Holweger
T. J. Harvey
J. Mayer
关键词： Materials: Ferrous Alloys  [材料：铁合金]
Steel  [ 钢]
Rolling Bearings: Rolling Element Bearings  [ 滚动轴承：滚子轴承]
General  [ 将军]
Wear: Fatigue  [ 穿着：疲劳]
White Etching Cracks  [ 白色蚀刻裂纹]
White Etching Area  [ 白色蚀刻区域]
Rolling Contact Fatigue  [ 滚动接触疲劳]
出版年： 2016
会议名： 2016 Society of Tribologists & Lubrication Engineers Annual Meeting & Exhibition
2016年摩擦学与润滑工程师学会年度会议暨展览会
届 次： 71st
摘 要： Using a combination of SEM, ECCI, EBSD and EDX techniques, this study has provided qualitative analysis of the microstructure alterations that is important for the clarification of complex steel microstructure changes such as DER, HABs/LABs and WECs. ECCI reveals complex microstructure of elongated grains that had previously been mis-regarded as defect/grooves/micro-cracks under SEM of Nital etched samples. The main conclusions from this study are: 1. the formation of altered microstructures in the classic RCF and in WEC accompanies similar primary spherical carbides dissolving processes; 2. carbon and chromium elements dissolved from the disintegrated primary spherical carbides are scattered inhomogeneous and homogeneous respectively in the altered microstructures of LABs, HABs and WEC, thus the formation of such altered microstructure may be controlled by the diffusion of these chemical elements; 3. the formation of globular ferrite, elongated grains and carbon-enriched areas are observed in both classic RCF and WEC specimens. However the elongated grains in WEC do not grow in defined directions and are locally varying but often occurring from the cracks; 4. the distinct directional characteristics observed in the altered microstructures due to RCF is suggested to be related to the external loading conditions. However WECs appear geometrically irregular thus suggests that the external rolling conditions are not dominating their formation. Future work is planned to further investigate these findings using Transmission Electron Microscopy (TEM), Atom Probe Tomography (APT) and nano-indentation techniques.

本研究结合了扫描电子显微镜（SEM）、电子能谱分析（ECCI）、电子背散射衍射（EBSD）和能量色散X射线光谱（EDX）技术，对钢中复杂的微观结构变化（如DER、HABs/LABs和WECs）进行了定性分析。结果表明，ECCI揭示了在氮化物蚀刻样品的SEM下曾被误认为缺陷/沟槽/微裂纹的细长晶粒具有复杂的微观结构。本研究的主要结论如下：1. 在经典的RCF和WEC中，形成改变后的微观结构伴随着相似的原始球状碳化物溶解过程； 2. 从分解的初级球状碳化物中溶解出的碳和铬元素，分别以不均匀和均匀的方式分散在LABs、HABs和WEC的改质微结构中，因此这些化学元素的扩散可控制此类改质微结构的形成。3. 在经典的RCF和WEC试样中均观察到球状铁素体、细长晶粒以及碳富集区域。然而，WEC中的细长晶粒并非沿特定方向生长，而是局部变化，且通常由裂纹处产生。4. 由于RCF引起的微结构变化表现出明显的方向性特征，这可能与外部载荷条件有关。然而，WECs的几何形状不规则，表明外部轧制条件并未主导其形成过程。未来计划通过透射电子显微镜（TEM）、原子探针断层扫描（APT）和纳米压痕技术进一步研究这些发现。
中文内容为网络AI翻译，专业术语未必准确，仅供参考。

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