Characterization and modeling of void nucleation by interface decohesion in dual phase steels

Received 9 June 2010; received in revised form 6 July 2010; accepted 19 July 2010. published online 26 July 2010.

In situ tensile tests have been carried out during X-ray microtomography imaging of dual phase steels. Void nucleation has been quantified as a function of strain and triaxiality using the obtained three-dimensional images. The Argon criterion of decohesion has been used in a model for nucleation in the case where martensite plays the role of inclusions. This criterion has been modified to include the local stress field and the effect of kinematic hardening present in such a heterogeneous material.

Keywords: Steel, Dual phase, Damage, X-ray tomography

a Université de Lyon, INSA-Lyon, MATEIS CNRS UMR5510, 7 Avenue Jean Capelle, 69621 Villeurbanne, France

b ArcelorMittal Research, Voie Romaine-BP30320, 57283 Maizieres-les-Metz Cedex, France

c Centre des Matériaux, Ecole des Mines de Paris, CNRS UMR 7633, BP 87, 91003 Evry Cedex, France

Corresponding author. Tel.: +33 472437140; fax: +33 472438539.

PII: S1359-6462(10)00494-X

doi:10.1016/j.scriptamat.2010.07.021

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