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Artículo

EBSD spatial resolution for detecting sigma phase in steels

Fernandez Bordin, Santiago PabloIcon ; Limandri, Silvina PaolaIcon ; Ranalli, J. M.; Castellano, Gustavo EugenioIcon
Fecha de publicación: 12/2016
Editorial: Elsevier Science
Revista: Ultramicroscopy
ISSN: 0304-3991
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

The spatial resolution of the electron backscatter diffraction signal is explored by Monte Carlo simulation for the sigma phase in steel at a typical instrumental set-up. In order to estimate the active volume corresponding to the diffracted electrons, the fraction of the backscattered electrons contributing to the diffraction signal was inferred by extrapolating the Kikuchi pattern contrast measured by other authors, as a function of the diffracted electron energy. In the resulting estimation, the contribution of the intrinsic incident beam size and the software capability to deconvolve patterns were included. A strong influence of the beam size on the lateral resolution was observed, resulting in 20 nm for the aperture considered. For longitudinal and depth directions the resolutions obtained were 75 nm and 16 nm, respectively. The reliability of this last result is discussed in terms of the survey of the last large-angle deflection undergone by the backscattered electrons involved in the diffraction process. Bearing in mind the mean transversal resolution found, it was possible to detect small area grains of sigma phase by EBSD measurements, for a stabilized austenitic AISI 347 stainless steel under heat treatments, simulating post welding (40 h at 600 °C) and aging (284 h at 484 °C) effects—as usually occurring in nuclear reactor pressure vessels.
Palabras clave: Electron Backscatter Diffraction , Monte Carlo Simulation , Sigma Phase , Spatial Resolution , Stainless Steel
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)
Identificadores
URI: http://hdl.handle.net/11336/72501
URL: http://www.sciencedirect.com/science/article/pii/S0304399116301991
DOI: http://dx.doi.org/10.1016/j.ultramic.2016.09.010
Colecciones
Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Fernandez Bordin, Santiago Pablo; Limandri, Silvina Paola; Ranalli, J. M.; Castellano, Gustavo Eugenio; EBSD spatial resolution for detecting sigma phase in steels; Elsevier Science; Ultramicroscopy; 171; 12-2016; 177-185
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