An analysis of premature cracking associated with microstructural alterations in an AISI 52100 failed wind turbine bearing using X-ray tomography
An analysis of premature cracking associated with microstructural alterations in an AISI 52100 failed wind turbine bearing using X-ray tomography
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DOI：
10.1016/j.matdes.2016.12.089
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发表时间：
2017-03-05
影响因子：
8.4
通讯作者：
Xiao, Xianghui
中科院分区：
文献类型：
--
作者：
Gould, Benjamin;Greco, Aaron;Xiao, Xianghui
被局部微结构改变区域包围的裂纹被称为“白色腐蚀裂纹”（WECs），在包括风力涡轮机齿轮箱轴承在内的众多应用中导致不可预测的和过早的失效。虽然这些故障的确切原因仍然未知，但存在大量关于这些裂缝如何以及为什么形成的假设。当前工作的目的是通过使用高能x射线断层扫描在失效的风力涡轮机轴承中绘制WEC网络来阐明这些假设，试图确定WEC起始的位置，以及钢中缺陷（如夹杂物或碳化物簇）的作用。在整个分析过程中发现了4个完全的地下白蚀坑，从而证实了地下起生是白蚀坑形成的方法。此外，在钢中的夹杂物周围发现了许多小的蝴蝶状裂纹，但需要进一步分析以验证这些夹杂物是否是白锈病的起始点。(C) 2017 Elsevier Ltd.版权所有。
Crack surrounded by local areas of microstructural alteration deemed "White etching cracks" (WECs) lead to unpredictable and premature failures within a multitude of applications including wind turbine gearbox bearings. While the exact cause of these failures remains unknown, a large number of hypotheses exist as to how and why these cracks form. The aim of the current work is to elucidate some of these hypotheses by mapping WEC networks within failed wind turbine bearings using high energy X-ray tomography, in an attempt to determine the location of WEC initiation, and the role of defects within the steel, such as inclusions or carbide clusters. Four completely subsurface WECs were found throughout the presented analysis, thereby confirming subsurface initiation as method of WEC formation. Additionally, a multitude of small butterfly like cracks were found around inclusions in the steel, however further analysis is needed to verify if these inclusions are initiation sites for WECs. (C) 2017 Elsevier Ltd. All rights reserved.