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A novel approach for nondestructive depth-resolved analysis of residual stress and grain interaction in the near-surface zone applied to an austenitic stainless steel sample subjected to mechanical polishing

Article dans une revue avec comité de lecture
Author
MARCISZKO-WIĄCKOWSKA, M.
445585 AGH University of Science and Technology [Krakow, PL] [AGH UST]
OPONOWICZ, A.
445585 AGH University of Science and Technology [Krakow, PL] [AGH UST]
BACZMAŃSKI, A.
445585 AGH University of Science and Technology [Krakow, PL] [AGH UST]
BRAHAM, Chedly
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
WĄTROBA, M.
230243 Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] [EMPA]
WRÓBEL, M.
445585 AGH University of Science and Technology [Krakow, PL] [AGH UST]
KLAUS, M.
220689 Helmholtz-Zentrum Berlin für Materialien und Energie GmbH [HZB]
GENZEL, Ch.
220689 Helmholtz-Zentrum Berlin für Materialien und Energie GmbH [HZB]

URI
http://hdl.handle.net/10985/22304
DOI
10.1016/j.measurement.2022.111016
Date
2022-05
Journal
Measurement

Abstract

The choice of the grain interaction model is a critical element of residual stress analysis using diffraction methods. For the near-surface region of a mechanically polished austenitic steel, it is shown that the application of the widely used Eshelby-Kr¨oner model does not lead to a satisfactory agreement with experimental observations. Therefore, a new grain interaction model called ’tunable free-surface’ is proposed, allowing for the determination of the in-depth evolution of the elastic interaction between grains. It has a strong physical justification and is adjusted to experimental data using three complementary verification methods. It is shown that a significant relaxation of the intergranular stresses perpendicular to the sample surface occurs in the subsurface layer having a thickness comparable with the average size of the grain. Using the new type of X-ray Stress Factors, the in-depth evolution (up to the depth of 45 μm) of residual stresses and of the strain-free lattice parameter is determined.

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