On the Accuracy of Elastic Strain Field Measurements by Laue Microdiffraction and High-Resolution EBSD: a Cross-Validation Experiment

Emeric Plancher (1) , Johann Petit (2) , Claire Maurice (3) , Véronique Favier (1) , Lucie Saintoyant (4) , Dominique Loisnard (5) , N. Rupin (6) , Jean Baptiste Marijon (1) , Olivier Ulrich (7) , Michel Bornert (8) , Jean Sébastien Micha (9, 10) , Odile Robach (9, 7) , Olivier Castelnau (1)

1 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
2 LEME - Laboratoire Energétique Mécanique Electromagnétisme
3 LHC - Laboratoire Hubert Curien
4 EDF - EDF
5 EDF R&D MMC - Matériaux et Mécanique des Composants
6 EDF R&D - EDF R&D
7 NRS - Nanostructures et Rayonnement Synchrotron
8 navier umr 8205 - Laboratoire Navier
9 ESRF - European Synchrotron Radiation Facility
10 STEP - Synthèse, Structure et Propriétés de Matériaux Fonctionnels

Determining the accuracy of elastic strain measurements in plastically deformed alloys is an experimental challenge. To develop a novel cross-validation procedure, a controlled elasto-plastic strain gradient was created in a stainless steel single crystal by four point bending deformation. The corresponding elastic strain field was probed, with an intragranular spatial resolution, in-situ by Laue microdiffraction and ex-situ by High Resolution EBSD. Good agreement is found for the two independent measurements and the predictions of a mechanical model, at plastic strains below 0.5 %. The accuracy of the measurements is estimated at 3.2 × 10 − 4 .

Mots clés: HR-EBSD; Laue-DIC; Austenitic steel; Stainless steel; Synchrotron radiation; Laue microdiffraction

Domaines: Sciences de l'ingénieur [physics]

Emeric Plancher, Johann Petit, Claire Maurice, Véronique Favier, Lucie Saintoyant, et al.. On the Accuracy of Elastic Strain Field Measurements by Laue Microdiffraction and High-Resolution EBSD: a Cross-Validation Experiment. Experimental Mechanics, 2016, 56 (3), pp.483-492. ⟨10.1007/s11340-015-0114-1⟩. ⟨hal-02141119⟩