Influence of the Combination of Microstructure and Mechanical Fields on Stress Corrosion Cracking Initiation of Cold-Worked Austenitic Stainless Steels

Qi Huang (1, 2) , Y. Charles (1) , Cecilie Duhamel (2) , Monique Gaspérini (1) , Jérôme Crépin (2)

1 LSPM - Laboratoire des Sciences des Procédés et des Matériaux
2 CDM - Centre des Matériaux

This work aims to understand the influence of both microstructure and mechanical fields on stress corrosion cracking (SCC) initiation in cold-worked austenitic stainless steels. To this aim, a SCC test is performed on a 316L stainless steel previously tensile pre-strained at room temperature. The experimental local displacement fields are measured after each loading step, using digital image correlation (DIC) based on microgrids, and from which the strain fields are also derived. In the meantime, a numerical finite element (FE) model is developed with Abaqus, aiming to reproduce the polycrystal features in the microgrid area (grain geometries and orientations). This model is submitted to the DIC-obtained displacement, allowing to simulate the strain and stress fields from polycristalline elastoplasticity constitutive equations. The experimental microstructure, as well as the numerical and experimental mechanical fields obtained at the end of the SCC test is then analyzed, compared and correlated to the cracking network.

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Qi Huang, Y. Charles, Cecilie Duhamel, Monique Gaspérini, Jérôme Crépin. Influence of the Combination of Microstructure and Mechanical Fields on Stress Corrosion Cracking Initiation of Cold-Worked Austenitic Stainless Steels. 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor, Aug 2019, Boston, United States. pp.967-978. ⟨hal-03198941⟩