Neutron time-of-flight diffraction used to study aged duplex stainless steel at small and large deformation until sample fracture

A. Baczmanski 1 Léa Le Joncour 2 Benoît Panicaud 2 Manuel François 2 C. Braham 3 A. Paradowska 4 S. Wronski 1, 5 Slimane Amara 2 R. Chiron 5
1 AGH UST - AGH University of Science and Technology [Krakow, PL]
2 LASMIS - Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée
ICD - Institut Charles Delaunay
3 LIM - Laboratoire d'Ingénierie des Matériaux
4 RAL - STFC Rutherford Appleton Laboratory
5 LPMTM - Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux
Abstract : Owing to its selectivity, diffraction is a powerful tool for analysing the mechanical behaviour of polycrystalline materials at the mesoscale (phase and/or grain scale). In situ neutron diffraction during tensile tests and elastoplastic self-consistent modelling were used to study slip phenomena occurring on crystallographic planes at small and large deformation. The critical resolved shear stresses in both phases of duplex stainless steel were found for samples subjected to different thermal treatments. The evolution of grain loading was also determined by showing the large differences between stress concentration for grains in ferritic and austenitic phases. It was found that, for small loads applied to the sample, linear elastic deformation occurs in both phases. When the load increases, austenite starts to deform plastically, while ferrite remains in the elastic range. Finally, both phases undergo plastic deformation until sample fracture. By using an original calibration of diffraction data, the range of the study was extended to large sample deformation. As a result, mechanical effects that can be attributed to damage processes initiated in ferrite were observed.
Keywords : polycrystalline materials neutron diffraction self-consistent models elastic–plastic deformation duplex stainless steel.
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Journal articles
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Submitted on : Thursday, September 5, 2019 - 2:20:11 PM
Last modification on : Monday, September 16, 2019 - 4:35:58 PM

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A. Baczmanski, Léa Le Joncour, Benoît Panicaud, Manuel François, C. Braham, et al.. Neutron time-of-flight diffraction used to study aged duplex stainless steel at small and large deformation until sample fracture. Journal of Applied Crystallography, International Union of Crystallography, 2011, 44 (5), pp.966-982. ⟨10.1107/S0021889811025957⟩. ⟨hal-02279618⟩

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