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Etude micromécanique et caractérisation expérimentale du comportement et de l'endommagement de l'acier de cuve 16MND5 à basses températures

Abstract : As part of an important experimental and numerical research program launched by Electricité De France on the 16MND5 pressure vessel steel, sequenced and in-situ tensile tests are realized at low temperatures [-196°C;-60°C]. They enable to associate the observation of specimens, the complete cartography of which has been made with a scanning electron microscope (damaging processes, initiation and propagation of microcracks), with the stress states determined by X-ray diffraction, in order to establish relevant criteria. All these measurements enable to supply a two-scale polycrystalline modeling of behavior and damage (Mori-Tanaka/self-consistent) which is developed concurrently with the experimental characterization. This model proves to be a very efficient one, since it correctly reproduces the influence of temperature experimentally defined: the stress state in ferrite remains less important than in bainite (the difference never exceeds 150MPa), whereas it is much higher in cementite. The heterogeneity of strains and stresses for each crystallographic orientation is well rendered; so is cleavage fracture normal to the {100} planes in ferrite (planes identified by electron back scattered diffraction during an in-situ tensile test at -150°C), which occurs sooner when temperature decreases, for a constant stress of about 700MPa in this phase.
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https://pastel.archives-ouvertes.fr/pastel-00000980
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Thursday, September 9, 2010 - 2:20:06 PM
Last modification on : Monday, April 16, 2018 - 10:40:20 AM
Long-term archiving on: : Friday, December 10, 2010 - 2:23:20 AM

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  • HAL Id : pastel-00000980, version 1

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Raphaël Pesci. Etude micromécanique et caractérisation expérimentale du comportement et de l'endommagement de l'acier de cuve 16MND5 à basses températures. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2004. Français. ⟨NNT : 2004ENAM0013⟩. ⟨pastel-00000980⟩

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