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Contenuto archiviato il 2022-12-23

Diffusion and phase transformations in nanocrystals of multicomponent systems of stainless steel type

Obiettivo



The influence of grain size reduction from the usual um sized to the nm-size range of austenitic-ferritic stainless steels is of great interest. It is especially the physical-mechanical and the corrosive properties that are improved by such a reduction of grain sizes.

The aim of this project is the targeted development of a method to produce this kind of nanocrystalline (nc) materials by a powder metallurgical route based on the pressure sintering of ultrafine powders.

Stainless steel (ss) powders in the grain size range of 10 - 100 nm are prepared by the impulse plasma channel method. The primary particles of such powders are either ferritic (a phase or austenitic g phase). The relative concentration of these phases determines the corrosive properties of the consolidated P/M product.

It is the purpose of this study to investigate the role of atomic diffusion on the phase transformation process in these nanocrystals in order to be able to tailor the phase ratio a/g after consolidation. For this purpose nc-ss powders will be coated. The diffusion profiles after heat treatment will be correlated with the resulting microstructure, especially the a/g phase ratio.

Invito a presentare proposte

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Meccanismo di finanziamento

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Coordinatore

Fraunhofer Institute for Applied Materials Research
Contributo UE
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Indirizzo
Lesumer Heerstraße 36
28717 Bremen
Germania

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Partecipanti (4)