Microstructural evolution during long time aging of 15–5PH stainless steel

When subjected to long-term aging at intermediate temperatures, the 15–5PH precipitation hardening martensitic stainless steel is subject to a complex evolution of its microstructure that impacts its service mechanical properties. This evolution includes possible evolution of minor austenite phase,...

Full description

Saved in:
Bibliographic Details
Published inMaterialia Vol. 9; p. 100634
Main Authors Couturier, Laurent, De Geuser, Frédéric, Deschamps, Alexis
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2020
Elsevier
Subjects
Aging
Atom probe tomography
Condensed Matter
Kinetics
Materials Science
Physics
Small angle scattering
Stainless steel
Aging
Small angle scattering
Kinetics
Stainless steel
Atom probe tomography
Online AccessGet full text

Cover

More Information
Summary:When subjected to long-term aging at intermediate temperatures, the 15–5PH precipitation hardening martensitic stainless steel is subject to a complex evolution of its microstructure that impacts its service mechanical properties. This evolution includes possible evolution of minor austenite phase, of the copper-rich precipitates, as well as unmixing of the chromium solid solution and formation of silicon-rich precipitates. In this work, a systematic quantification of all these evolutions as a function of aging temperature and time is obtained by combining advanced characterization tools, notably phase and orientation mapping in the transmission electron microscope, atom probe tomography, and small angle X-ray and neutron scattering. Results show a remarkable stability of austenite and Cu precipitation, and evidence the kinetics of Cr unmixing and Si-rich phase formation. We propose a phenomenological model for the Cr composition fluctuations’ amplitude and characteristic length increase with aging and put it in relation to hardness’ evolution. [Display omitted]
ISSN:2589-1529
2589-1529
DOI:10.1016/j.mtla.2020.100634