Adaptation of the X-Ray Diffraction Technique to the Analysis of Residual Stress in Carbo-Nitrided Steel Layers

Jean Michel Sprauel; H. Michaud

doi:10.4028/www.scientific.net/MSF.490-491.125

Paper Titles

Effect of Stress Wave in the Course of Metal Machining
p.107

Simulation of the Residual Stress of Cold-Formed Thin-Wall Steel Members and Calculation of Load under Its Influence
p.112

Measurement of Stress Distribution Near Fatigue Crack in Ultra-Fine Grained Steel by Synchrotron Radiation
p.118

Approximate Analytical Formulae to Evaluate the Uncertainty in X-Ray Stress Analysis
p.124

Adaptation of the X-Ray Diffraction Technique to the Analysis of Residual Stress in Carbo-Nitrided Steel Layers
p.125

The Sensitivity of Focusing, Parallel Beam and Mixed Optics to Alignment Errors in XRD Residual Stress Measurements
p.131

X-Ray Stress Measurement Using Whole Back Diffraction Ring
p.137

Non-Destructive Analysis of Surface Stresses Using Grazing Incident X-Ray Diffraction
p.143

Stresses Evaluation by Transmission Energy Dispersive X-Ray Diffraction Using Industrial Radiography Equipment
p.149

HomeMaterials Science ForumMaterials Science Forum Vols. 490-491Adaptation of the X-Ray Diffraction Technique to...

Adaptation of the X-Ray Diffraction Technique to the Analysis of Residual Stress in Carbo-Nitrided Steel Layers

Abstract:

X-ray diffraction is used to analyse the fatigue behaviour of carbo-nitrided steel layers. Measurements are therefore carried out on the two major phases of the material, i.e. the martensite (a') and the retained austenite (g). On such gear material, X-ray residual stress evaluations are particularly difficult for three reasons. First, the studied material is multiphase. For that reason, in each phase, the stress component in the direction normal to the surface is non negligible. Second, the diffraction peaks obtained on the martensite are broadened, due to the overlap of different reflections of the tetragonal structure. Third, the material contains also carbide and nitride clusters, which lead to incoherent and diffuse scattering of X-rays thus making quantitative phase determination difficult. In our paper the methods used to solve these problems are presented. The development of a new quantitative phase analysis method which accounts for the variation of diffuse scattering of X-rays is shown first. The second part deals with an iterative micromechanical model implemented for the evaluation of the carbon content and the residual stress components of each phase. These methods are used for analysing the evolution with cycling fatigue of all the parameters derived from our enhanced analysis (phase volume fraction, carbon content, stress components, peak width).

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Materials Science Forum (Volumes 490-491)

Pages:

125-130

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https://doi.org/10.4028/www.scientific.net/MSF.490-491.125

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Online since:

July 2005

Authors:

Jean Michel Sprauel, H. Michaud

Keywords:

Carbo-Nitriding, Residual Stress, Steel, X-Ray Diffraction (XRD)

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References

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