| Titre : |
Crack Initiation Mechanisms in Very High Cycle Fatigue at High Temperatures of Nibased Single Crystal Superalloys: Transition from Internal Sites to the Surface |
| Titre original : |
Mécanismes d’amorçage de fissures en fatigue gigacyclique à haute températures des superalliages base-Ni monogranulaires : transition cœur/surface |
| Type de document : |
thèse |
| Auteurs : |
Luciana Maria BORTOLUCI ORMASTRONI, Auteur ; Patrick VILLECHAISE, Directeur de thèse ; Jonathan CORMIER, Directeur de thèse ; Institut PPRIME UPR CNRS 3346 - PMM, Commanditaire ; Marion BARTSCH, Rapporteur ; Vincent MAUREL, Rapporteur ; Fernando PEDRAZA-DIAZ, Examinateur ; Véronique FAVIER, Examinateur |
| Année de publication : |
2022 |
| Importance : |
360 p. |
| Note générale : |
NNT 2022ESMA0005
Acknowledgements
Table of Contents
Acronyms and Abbreviations
General Introduction
Appendices
References
Abstrect
Keywords
|
| Catégories : |
Alliages réfractaires:Fissuration
Alliages:Fatigue
Durée de vie (ingénierie)
Endommagement, Mécanique de l' (milieux continus)
Nickel:Alliages:Effets des hautes températures
Revêtements
Solidification
|
| Résumé : |
LITTERATURE REVIEW
Nickel based SX Superalloys: Sollidification Methods, Chemical Composition and, Metallurgical Defects
Solution and Aging Heat Treatments
High Temperature Mechanical Properties of Ni-based Superalloys and the Impact of Bond Coat
Fatigue of Nickel-based Single-Crystal Supperalloys at High Temperatures
Summary and Objectives
MATERIALS AND EXPERIMENTAL PROCEDURES
Introduction
Superalloys and Bond Coat Details
Mechanical Testing Procedures
Characterization Methods
Mechanical Test Summary
VERY HIGH CYCLE FATIGUE DURABILITY OF UNCOATED SUBSTRATES
Introduction
Casting Pore Size and the Solidification Process Impact
HIP Treatment and Compacted Casting Pores
PBF-E Processed Ni-based SX Superalloy: Toward Defct-Free Single Crystals?
Processiong Defects: Stray Grains
Crack Initiation from the Surface
Conclusions
FATIGUE LIFE OF COATED NI-BASED SINGLE CRYSTAL SUPPERALLOYS
Introduction
Impact of the Bond Coat on the LCF Durability
Impact of the Bond Coat in Very High Cycle Fatigue
Conclusions
ANALYSIS OF CRACK INITIATION MECHANISM TRANSITION FROM INTERNAL SITES TO THE SURFACES IN THE VERY HIGH CYCLE FATIGUE REGIME
GENERAL CONCLUSIONS AND FUTURE PROSPECTS |
| En ligne : |
https://tel.archives-ouvertes.fr/tel-04042436 |
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