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Thesis
Home   /   Post Doctorat   /   Study of cleavage brittle crack initiation sites in low alloy bainitic steels with segregations

Study of cleavage brittle crack initiation sites in low alloy bainitic steels with segregations

Engineering sciences Materials and applications Mechanics, energetics, process engineering

Abstract

Macro-segregations of alloy elements and impurities in heavy forged 16-20 MND5 components or Pressurized Water nuclear Reactors induces significant fluctuations of these mechanical properties, and in particular, of dynamic and fracture toughness. Such a macro-segregation occurs during the solidification of the ingot and can still be observed in the final component, even after significant discarding performed on purpose during the fabrication process.
Recent results have confirmed the essential role played by specific carbides located close to grain boundaries, even for moderately segregated materials. The main objective of this Post-Doctoral internship is to precisely study some clivage initiation sites on these alloys to determine the types of carbides and the cristallographic conditions that promote crack initiation. A statistical analysis will then be performed to identify the population of these carbides within the microstructure of the material. The experimental results will be used as entries of a local approach to brittle fracture model.

Laboratory

Département de Recherche sur les Matériaux et la Physico-chimie pour les énergies bas carbone
Service de Recherche en Matériaux et procédés Avancés
Laboratoire d’étude du Comportement Mécanique des Matériaux
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