ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The conventional Bragg diffraction geometry, normally used to characterize the residualsurface stress state, it is not suitable to evaluate surface treated materials and thin films. The X-raypath lengths through a surface layer or thin film are too short to produce adequate diffractionintensities in relation to the bulk or the substrate. Another limitation of the conventional techniqueappears when a residual stress gradient is present in the irradiated surface. The technique onlyenables the evaluation of the mean value of this gradient. In these cases, a recently proposedPseudo-Grazing Incident X-ray Diffraction method would be better applicable.In this study, the Pseudo-Grazing Incidence X-ray Diffraction is applied to characterize the residualstress depth profiles of several AISI 4140 samples, which were prepared, by mechanical polishingand grinding, in order to present different surface roughness parameters, Ra. The experimentalresults lead to the conclusion that the surface roughness limits the application of thePseudo-Grazing Incidence methodology to a minimum X-ray incident angle. This angle is the onethat enables a mean X-ray penetration depth with the same order of magnitude of the sample surfaceroughness parameter, Ra
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.514-516.1618.pdf
Permalink
