Fournier, Benjamin (2007) Fatigue-fluage des aciers martensitiques à 9-12%Cr : comportement et endommagement. PhD thesis Sciences et génie des matériaux, Centre des Matériaux P.M. Fourt, ENSMP p.525.
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Abstract
9-12%Cr martensitic steels are studied in the framework of the generation IV nuclear reactors. Most of the structural components for which these still may be used will be subjected to high temperature (550°C) creep-fatigue loadings. The PhD was focused on the understanding and modeling of the cyclic stress-strain behaviour and of the damage mechanisms. The models finally proposed are based on detailed observations carried out on SEM, TEM and EBSD. The cyclic softening effect of these steels is attributed to the coarsening of their microstructure. A micromechanical model based on physical parameters is proposed and leads to encouraging results. The observed damage results from the interactions between creep, fatigue and oxidation. Two main types of damage are observed and explained. A lifetime prediction model is proposed and gives very good results. Possible extrapolations of the present results and models are discussed.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Pineau, André and Sauzay, Maxime |
| Date: | 19 September 2007 |
| Board of examiners: | Rauch, Edgar and Degallaix, Suzanne and Polak, Jaroslav and Escaravage, Claude and Gabrel, Jean and Pineau, André and Sauzay, Maxime |
| Ecole Doctorale: | ED 432 ECOLE DOCTORALE SCIENCES DES METIERS DE L'INGENIEUR |
| Discipline: | Sciences et génie des matériaux |
| Collection (Fonds): | ENSMP |
| Institution: | ENSMP |
| Department: | Centre des Matériaux P.M. Fourt |
| Subjects: | 4. Materials Science, Mechanics and Mechanical Engineering |
| Uncontrolled Keywords: | Martensitic steel, Creep, Mechanical test, Finite element method, Mathematical model, Fatigue, Fluage, Acier martensitique |
Table of content
INTRODUCTION
Bibliographie générale
Comportement et évolutions microstructurales
Endommagement et durée de vie
Conclusions et perspectives
A. Analysis of the hysteresis loops of a martensitic steel. Part I : Study of the influence of strain amplitude and temperature under pure fatigue loadings using an enhanced stress partitionning method
B. Analysis of the hysteresis loops of a martensitic steel. Part II : Study of the influence of creep and stress relaxation holding times on cyclic behaviour
C. Compositions de différents aciers à 9-12%Cr
D. Bibliographie succincte dédiée aux phénomènes d’oxydation
E. Moyens expérimentaux
| ID Code: | 3271 |
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| Deposited By: | Odile ADAM |
| Deposited On: | 15 February 2008 |
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