Authors
Yuchen Zhao, Léa Le Joncour, Andrzej Baczmanski, Elzbieta Gadalińska, Sebastian Wroński, Benoît Panicaud, Manuel François, Chedly Braham, Thomas Buslaps,
Title
Stress distribution correlated with damage in duplex stainless steel studied by synchrotron diffraction during plastic necking
In
Materials and Design
Volume
113
Pages
157–168
Publisher
Elsevier
Year
2017
Publisher's URL
https://doi-org.insis.bib.cnrs.fr/10.1016/j.matdes.2016.10.014
Indexed by
Abstract
The goal of this work was the determination of lattice strains distribution in two phases of duplex steel during plastic necking. Subsequently, the stress heterogeneity in the neck was studied in order to determine the reason for the damage initiation and to verify the hypothesis that the damage begins in the ferritic phase. To do this, Xray synchrotron radiation was used to scan the 'in situ' variation of the interplanar spacings along the necking zone for samples subjected to tensile loading. A self-consistent model and FEM simulation were applied for the experimental data interpretation. It was found that for advanced necking the phase lattice strains, especially those measured at some distance from the neck centre, show a large inversion of the loads localised in both phases compared to the undamaged state (the lattice strains in the ferrite become smaller than in the austenite). This effect indicates stress relaxation in the ferrite which is connected with the damage phenomenon. Correlation of the experimental results with the modelling shows that the value of von Mises stress is responsible for the initiation of the ferritic phase softening
Affiliations
Offprint