Authors
Title
Duplex steel at small and large deformation until damage: neutron diffraction and self-consistent model,
In
Journal of Applied Crystallography
Volume
44
Issue
5
Pages
966–982
Publisher
International Union of Cristallography
Year
2011
Indexed by

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.
Affiliations
Offprint