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Stress distribution correlated with damage in duplex stainless steel studied by synchrotron diffraction during plastic necking

Article dans une revue avec comité de lecture
Author
ZHAO, Yuchen
93484 Université de Technologie de Troyes [UTT]
LE JONCOUR, L
93484 Université de Technologie de Troyes [UTT]
BACZMANSKI, Andrzej
GADALIŃSKA, E
232948 Institute of Aviation [Warsaw]
WRONSKI, Sebastian
PANICAUD, B
116261 Institut Charles Delaunay [ICD]
FRANÇOIS, M
116261 Institut Charles Delaunay [ICD]
BUSLAPS, T
2568 European Synchrotron Radiation Facility [ESRF]
ccBRAHAM, Chedly
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/11660
DOI
10.1016/j.matdes.2016.10.014
Date
2017
Journal
Materials and Design

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, X-ray 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.

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