Skip to Main content Skip to Navigation
Theses

Caractérisation des évolutions microstructurales de l'acier inoxydable martensitique à durcissement structural 15-5PH au cours du vieillissement thermique

Abstract : The precipitation hardened martensitic stainless steel grade 15-5PH is used in the airplane industryas constitutive material of parts joining reactors to wings. Due to its application it is subjected totemperatures around 300°C leading to its embrittlement. Stainless steels embrittlement in thistemperature range is due to iron-chromium unmixing by spinodal decomposition. In addition, the 15-5PH grade has a complex microstructure comprising copper precipitates responsible for the initialhardening of the alloy, reversed austenite, known in this kind of steels to improve the toughness,which appears during the precipitation thermal treatment and G phase that precipitates duringaging. The evolutions of these microstructure components could also lead to some modifications ofthe material mechanical properties. In order to study the microstructure evolutions we use acombination of characterization techniques aiming at their most complete description. We show thatthe mechanical properties evolution is controlled by the spinodal decomposition of the matrix whoseevolution we are able to depict by simple phenomenological laws. We propose an indirect methodfor the measurement of aging kinetics of the 15-5PH steel, which we have correlated to directmeasurements, and a phenomenological law allowing the prediction of the alloy hardness based onits thermal history.
Complete list of metadata

https://tel.archives-ouvertes.fr/tel-01127929
Contributor : Abes Star :  Contact
Submitted on : Monday, March 9, 2015 - 5:52:24 AM
Last modification on : Thursday, November 19, 2020 - 3:54:18 PM
Long-term archiving on: : Wednesday, June 10, 2015 - 11:25:52 AM

File

2014GRENI045.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01127929, version 1

Collections

Citation

Laurent Couturier. Caractérisation des évolutions microstructurales de l'acier inoxydable martensitique à durcissement structural 15-5PH au cours du vieillissement thermique. Matériaux. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENI045⟩. ⟨tel-01127929⟩

Share

Metrics

Record views

1212

Files downloads

5701