Issue |
Matériaux & Techniques
Volume 83, 1995
Matériaux intelligents. Corrosion sous contrainte. Essai de dureté
|
|
---|---|---|
Page(s) | 53 - 55 | |
DOI | https://doi.org/10.1051/mattech/199583120053s | |
Published online | 21 June 2017 |
I - Fissuration d’un superalliage base Nickel à 650°C sous air : effet de l’oxydation
Cracking resistance of a Ni based superalloy at 650°C under air environment: oxidation effect
Abstract
Creep-fatigue cracking resistance of alloy N18 has been studied at high temperature under air or vacuum conditions. Two microstructures with different creep resistance were used. It is shown that under air environment, the microstructure can influence the fatigue cracking resistance of this alloy. However, this effect disappears under vacuum conditions. Consequently, the local interaction between the mechanical behavior of the material and oxidation processes at the crack tip has been investigated. Specific creep-fatigue tests with forced relaxation have been carried out under air.
Concurrently, the oxygen partial pressure were cycled during the hold time of a creep-fatigue mechanical test.
From these different tests, it is concluded that the detrimental interaction between the environment and the local mechanical behaviour at the crack tip occurs during the first stages of the relaxation process taking place at the crack tip surface.
© SIRPE 1995
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.