Three scale modeling of the behavior of a 16MND5-A508 bainitic steel: Stress distribution at low temperatures
Article dans une revue avec comité de lecture
Date
2009Journal
Materials Science and Engineering: ARésumé
An original approach is proposed to predict the behavior of the16MND5bainitic steel (similar to U.S. A508 cl.3) in the lower range of the ductile-to-brittle transition region and at lower temperatures [−196 ◦C; 20 ◦C], by developing a new polycrystalline modeling concurrently with X-ray diffraction (XRD) analysis. A two-level homogenization is used to take into account each kind of heterogeneity as well as the phase and grain interactions. A Mori–Tanaka formulation first enables to describe the elastoplastic behavior of a bainitic single crystal (modeled as a single crystal ferritic matrix reinforced by cementite inclusions), while the transition to polycrystal is achieved by a self-consistent approach. This model can simulate in particular the effects of temperature. It reproduces qualitatively the stress distribution in the material (stress states are lower in ferrite than in the bulk material due to cementite particles, the difference never exceeding 150 MPa), the intergranular strain heterogeneity (ripples observed on the ε = f(sin2 ) curve) and the pole figures determined by XRD on different scales. The proposed approach is validated here on the macroscopic, phase and intraphase scale.
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Conférence invitéeINAL, Karim; MASSON, Renaud;
PESCI, Raphaël (Jacques Besson, Dominique Moinereau, Dirk Steglich, 2006)
A series of in-situ tensile tests was performed at various low temperatures to characterize the mechanical properties and the fracture processes of the 16MND5 steel: the damage was observed with a SEM and the internal ... -
Article dans une revue avec comité de lectureLa nature biphasée de l’acier bainitique 16MND5 (ferrite/cémentite) fait de la Diffraction des Rayons X (DRX) l’outil privilégié pour déterminer les états de contrainte dans la phase ferritique (méthode des sin2 ψ). Couplés ...
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Article dans une revue avec comité de lectureMany tensile tests have been realized on the 16MnNiMo5 bainitic pressure vessel steel at low temperatures [-196°C, -60°C]. The damaging processes (ductile/fragile) are observed with a scanning electron microscope (SEM), ...
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Article dans une revue avec comité de lectureINAL, Karim; LEBRUN, Jean-Lou; DIARD, Olivier; MASSON, Renaud;
PESCI, Raphaël (Wiley-Blackwell, 2006)
Stress analyses by X-ray diffraction are performed on a cast duplex (32% ferrite) stainless steel elbow and a bainitic (95% ferrite) pressure vessel steel. During an in situ tensile test, micrographic observations are made ... -
Conférence invitéeA specific in-situ tensile device has been set up in an X-Ray diffractometer. Stress can be measured at low temperature during loading in the baintic steel and in the ferritic phase. A two-scale modeling has been proposed ...