Comportement en fatigue-relaxation de l'alliage 800 (Z 5 NCT A 33-21) à 550° C : influence du vieillissement et prévision à long terme

Abstract : Greep and low cycle fatigue tests and without hold time have been carried out at 500° C on a bar of alloy 800 grade 2. The influence of a previous ageing during 3000 h at 550 °C has been studied. Metallurgical investigations allowed to analyse the deformation and breaking modes and to characterize the damage for the different types of tests. Modelization of relaxation curves has been performed with two distinct models allowing both extrapolation to very long hold times. Long term life predictions for creep fatigue test with long dwell time and small deformations have been obtained by application of two methods of creep fatigue interaction : mechanical approach with a non-linear cumilations of fatigue and creep damage both of being related to external mechanical variables ; metallurgical approach with a damage concept based on quantitative metallographic measurements
Complete list of metadatas

https://hal.univ-lorraine.fr/tel-01775550
Contributor : Administrateur Du Ccsd <>
Submitted on : Tuesday, April 24, 2018 - 3:35:49 PM
Last modification on : Tuesday, July 3, 2018 - 1:22:03 AM
Long-term archiving on : Wednesday, September 19, 2018 - 11:35:35 AM

File

El.Gharad.A.SMZ8620.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01775550, version 1

Collections

Citation

Abdellah El- Gharad. Comportement en fatigue-relaxation de l'alliage 800 (Z 5 NCT A 33-21) à 550° C : influence du vieillissement et prévision à long terme. Mécanique des matériaux [physics.class-ph]. Université Paul Verlaine - Metz, 1986. Français. ⟨NNT : 1986METZ020S⟩. ⟨tel-01775550⟩

Share

Metrics

Record views

17

Files downloads

11