Méthodologie d'analyse des contraintes résiduelles par diffraction des rayons X sur des pièces d'alliage de titane de nuance Ti-10V-2Fe-3Al

Abstract : The durability of components in titanium alloy Ti-10V-2Fe-3Al, used in components of helicopters such as rotor hubs, relies on the external loading as well as on the residual stress field. These residual stresses can be determined by X-ray diffraction (XRD). However, XRD is only able to evaluate the stresses in one crystallographic phase. Thus, for complex multiphased materials, the macroscopic stress state taken into account in the durability calculations corresponds to a mixture law between the stresses in phases, weighted by their volume fraction. Moreover, in the case of two-phase alloy Ti-10V-2Fe-3Al, results obtained by XRD in the near surface are a priori not satisfactory, because of the diffraction peaks overlapping and fluorescence phenomena. The position of the peaks and their shapes are poorly defined, which creates significant errors in the determination of the stresses. Several instrumental configurations were considered in this study for optimizing the acquisition. Then, interactions between radiations and matter depend on the microstructure. This is why the impact of forging, milling and shot-peening on the microstructure and the full width of the peaks has been studied. The preferred orientations (textures) generated by theses processes were observed. The neutron diffraction analysis complemented the XRD analysis in order to observe a larger volume of material. Finally, the elasticity constants of α and β phases of the alloy were reevaluated, based on these measurements and using self-consistent modelling. In the end, we defined a methodology for analysing the residual stresses by XRD on forged, milled or shot-peened titanium alloy Ti-10V-2Fe-3Al, within an industrial environment, while providing results consistent with models mechanical (fatigue as an example).
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Mechanics of materials. Arts et Métiers ParisTech, 2010. French. <NNT : 2010ENAM0031>


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Submitted on : Friday, November 19, 2010 - 3:31:23 PM
Last modification on : Tuesday, July 19, 2011 - 2:47:58 PM

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Camille Deleuze. Méthodologie d'analyse des contraintes résiduelles par diffraction des rayons X sur des pièces d'alliage de titane de nuance Ti-10V-2Fe-3Al. Mechanics of materials. Arts et Métiers ParisTech, 2010. French. <NNT : 2010ENAM0031>. <pastel-00537861>

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