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Evolution of microstructure and impact-strength energy in thermally and thermomechanically aged 15-5 PH

Herny, Emilie and Lours, Philippe and Andrieu, Eric and Cloué, Jean-Marc and Lagain, Philippe Evolution of microstructure and impact-strength energy in thermally and thermomechanically aged 15-5 PH. (2008) Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, vol. 222 (n° 4). pp. 299-304. ISSN 1464-4207

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Official URL: http://pil.sagepub.com/content/222/4/299

Abstract

Due to its outstanding mechanical resistance and resistance to corrosion, alloy 15-5 PH can be beneficially used for manufacturing aerospace structural parts. Following exposure to intermediate temperature, from300◦–400 ◦C, the alloy embrittles through the decomposition of the martensite into iron-rich and chromium-rich domains.Depending on the ageing time, these domains are either interconnected or unconnected with each other. The embrittlement results in a drastic drop of the impact strength-energy and an increase of the ductile-to-brittle transition temperature. The initial microstructure and mechanical properties can be recovered through a re-homogenization of the distribution of chromium and iron atoms in the material in the case where the decomposition of the matrix is not too pronounced. The application of a stress higher than 60 per cent of the yield strength further enhances the ageing kinetics in the case where the combined effect of temperature and time results in the spinodal decomposition of the martensite.

Item Type:Article
Additional Information:Thanks to SAGE Publications editor. The definitive version is available at http://www.uk.sagepub.com/home.nav The original PDF of the article can be found at Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications website : http://pil.sagepub.com/ DOI is wrong
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > AREVA (FRANCE)
Other partners > Airbus (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Ecole des Mines d'Albi-Carmaux - EMAC
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By: Leila Abdelouhab

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