Comparison of the Microstructural Changes and X-ray Diffraction Peak Width Decrease during Rolling Contact Fatigue in Martensitic Microstructures

2012 ◽  
pp. 303-328 ◽  
Author(s):  
Jürgen Gegner ◽  
Wolfgang Nierlich
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Diffraction Peak ◽  
Rolling Contact ◽  
Peak Width ◽  
X Ray Diffraction ◽  
Microstructural Changes ◽  
X Ray ◽  
Diffraction Peak Width

Service Loading Analysis of Wind Turbine Gearbox Rolling Bearings Based on X-Ray Diffraction Residual Stress Measurements

2013 ◽  
Vol 768-769 ◽  
pp. 723-732 ◽  
Author(s):  
Jürgen Gegner ◽  
Wolfgang Nierlich
Keyword(s):  
Residual Stress ◽  
Wind Turbine ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
X Ray Diffraction ◽  
Rolling Bearings ◽  
Wind Turbine Gearbox ◽  
X Ray ◽  
Stress Measurements

Rolling bearings in wind turbine gearboxes occasionally fail prematurely by so-called white etching cracks. The appearance of the damage indicates brittle spontaneous tensile stress induced surface cracking followed by corrosion fatigue driven crack growth. An X-ray diffraction based residual stress analysis reveals vibrations in service as the root cause. The occurrence of high local friction coefficients in the rolling contact is described by a tribological model. Depth profiles of the equivalent shear and normal stresses are compared with residual stress patterns and a relevant fracture strength, respectively. White etching crack failures are reproduced on a rolling contact fatigue test rig under increased mixed friction. Causative vibration loading is evident from residual stress measurements. Cold working compressive residual stresses are an effective countermeasure.

scholarly journals The Change of X‐ray Diffraction Peak Width During in situ Conventional Sintering of Nanoscale Powders

2016 ◽  
Vol 99 (3) ◽  
pp. 765-768 ◽  
Author(s):  
Jean‐Marie Lebrun ◽  
Shikhar K. Jha ◽  
Kiran S. Naik ◽  
Kevin C. Seymour ◽  
Waltraud M. Kriven ◽  
...  
Keyword(s):  
Diffraction Peak ◽  
Peak Width ◽  
X Ray Diffraction ◽  
X Ray ◽  
Conventional Sintering ◽  
Diffraction Peak Width

Evaluation of Rolling Contact Fatigue Using X-Ray Diffraction Ring

2016 ◽  
pp. MPC20150027 ◽  
Author(s):  
Takumi Fujita ◽  
Naoya Kamura ◽  
Yoichi Maruyama ◽  
Toshihiko Sasaki
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
X Ray Diffraction ◽  
Diffraction Ring ◽  
X Ray

scholarly journals X-Ray Diffraction Residual Stress Measurements for Assessment of Rolling Contact Fatigue Behaviour of Railway Steels

2014 ◽  
Vol 996 ◽  
pp. 782-787 ◽  
Author(s):  
António Castanhola Batista ◽  
Joao P. Nobre ◽  
Daniel F.C. Peixoto ◽  
Luis A.A. Ferreira ◽  
Paulo M.S.T. de Castro ◽  
...  
Keyword(s):  
Residual Stress ◽  
Cyclic Loading ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fatigue Behaviour ◽  
Rolling Contact ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Stress Profiles

Rolling contact fatigue twin-disc tests were performed on rail/wheel steels from Spanish high velocity trains (AVE). Residual stress profiles were determined using X-ray diffraction before and after cyclic loading. The evolution of residual stress profiles, due to cyclic loading, was analysed in order to study how they affect the rolling contact fatigue behaviour of these materials. This study is included in a major project where other related phenomena and materials’ properties have been studied.

Thermo-mechanical behavior of Fe thin films

2003 ◽  
Vol 795 ◽  
Author(s):  
Nail R. Chamsoutdinov ◽  
Amarante J. Böttger ◽  
Rob Delhez ◽  
Frans D. Tichelaar
Keyword(s):  
Mechanical Behavior ◽  
Diffraction Peak ◽  
Peak Width ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wafer Curvature ◽  
State Of Stress ◽  
Diffraction Peak Width ◽  
Scanning Electron ◽  
Good Agreement

ABSTRACTThe thermo-mechanical behavior of magnetron sputtered Fe polycrystalline films of thickness between 50 nm and 400 nm has been investigated. The state of stress has been determined by means of wafer curvature and X-ray diffraction (sin2ψ-method). Both methods are in good agreement for layers of thickness above 200 nm. For specimens of smaller layer thickness, however, the average stresses as measured by X-ray diffraction are systematically higher than those observed by wafer curvature experiments. The results can be interpreted in terms of differences in micro-strain (estimated using X-ray diffraction peak width analysis) and grain size as obtained by transmission and scanning electron microscopy. Thermal cycling experiments were performed between RT and 873 K. The effect of microstructure on thermo-mechanical properties was shown to be crucial.

Residual Stress in Railway Rails by IP/cosα Method

2006 ◽  
Vol 524-525 ◽  
pp. 381-386 ◽  
Author(s):  
Toshihiko Sasaki ◽  
Shunichi Takahashi ◽  
Kengo Iwfuchi ◽  
Yukio Satoh ◽  
Yoshikazu Kanematsu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Fatigue Damage ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
X Ray Diffraction ◽  
Present Measurement ◽  
X Ray ◽  
Fundamental Experiment

In this study, a new portable X-ray stress analyzer was designed and manufactured. The purpose of its use is to evaluate the rolling contact fatigue damage in rails for establishing an effective rail maintenance method. An image plate was used in this analyzer for detecting diffracted X-ray beams. The cosα method was adopted for X-ray stress analysis from X-ray diffraction data. A fundamental experiment was made first for examning the present measurement system. Residual stresses in rails used in service for six years were also investigated in this study.

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