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A common cause for premature bearing failures in wind turbine gearboxes are the so-called White Etching Cracks (WEC). These undirected, three-dimensional cracks are bordered by regions of altered microstructure and ultimately lead to a cracking or spalling of the raceway. An accelerated WEC test was carried out on a FE8 test rig using cylindrical roller thrust bearings made of martensitic 100Cr6 steel...
The object of this paper is to investigate the influence of solid solution strengthening on the spalling behavior of railway wheel steel. White etching layer (WEL) was reproduced by twin-disc test and analyzed by phase transformation kinetic. Spalling of WEL was then evaluated by rolling contact fatigue (RCF) test and finite element analysis. The results show that solid solution strengthening improves...
Rolling contact fatigue (RCF) of rail is a significant factor affecting the maintenance and service safety of railway track. While the driving parameters are known, clearer relationships are needed with fatigue life. The objective of this study was to explore the role of slip ratio in the development of RCF cracks and fatigue life of rail materials under a water lubricated condition. The results indicate...
Rolling contact fatigue (RCF) and wear, two major deterioration processes, limit the lifetime of rails. These deterioration processes are even more severe on the curves of tracks used by heavy haul trains. Because wear is a material removing process, it can suppress the formation of RCF (also known as surface initiated cracks). In railways, cracks have a higher risk of instigating a catastrophic failure...
In this work, the dry and lubricated wear behavior of rail steels (R370CrHT) under Rolling Contact Fatigue (RCF) conditions was studied in laboratory. A twin-disc rolling-sliding machine was used to reproduce contact conditions under high contact pressure (1.1GPa) and high creepage (5%) with the aim of accelerating RCF failure. Two different types of tests were performed, namely dry and lubricated...
The influence of lubricant additives on rolling contact fatigue crack propagation and the mechanisms responsible for the resulting micro-scale damage, was studied via experiments conducted on complete transmissions in a test cell. Bench-scale tribological tests and the exposure of steel surfaces to two different formulated lubricants were also carried out. Scanning and Transmission Electronic Microscopy...
The rolling contact fatigue between railway wheel and rail is a critical theme. It is very important to evaluate and monitor RCF damage between a railway wheel and rail to prevent derailment and increased maintenance costs. The electro-magnetic array technique was applied in rolling contact fatigue tests using a twin-disc tester under constant speed to detect the damage processing. The applied sensor...
A common challenge in multiple fields of the mechanical driveline technology is the premature failure of rolling bearings due to white etching cracks (WEC). This failure mode is characterized by three-dimensional cracks, bordered by regions of altered material microstructure, which eventually lead to cracking or spalling of the raceway. Ultrasonic analysis of cylindrical roller thrust bearings have...
Rolling elements made of 52100 steel were subjected to high austenitizing temperatures to embrittle the steel. The embrittled rolling elements were intentionally given a rougher surface finish and were subjected to bearing tests under rolling-sliding conditions. Post-test material investigations revealed cracks in the raceways and rollers. Detailed electron microscopy investigations showed highly...
In this study, the effects of refurbishing on rolling contact fatigue (RCF) in case carburized AISI 8620 steel were experimentally and analytically investigated. A thrust bearing test apparatus (TBTA) was designed and developed to simulate RCF. Initial RCF tests were conducted on AISI 8620 steel specimens to determine the baseline for pristine. Then new specimens were exposed to fatigue cycles equal...
The goal of this work is to increase understanding of plastic deformation of the pearlitic microstructure in the wheel/rail contact. The tridimensional gradient of microstructure below the running band of a worn R260 rail is investigated using multi-scale approach based on microstructural observations by optical and Scanning Electron Microscopy (SEM-FEG), microindentation and Electron BackScatter...
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