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. Programma(i) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Argomento(i) 15 - Condensed Matter Physics Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore Fraunhofer Institute for Applied Materials Research Contributo UE Nessun dato Indirizzo Lesumer Heerstraße 36 28717 Bremen Germania Mostra sulla mappa Costo totale Nessun dato Partecipanti (4) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Centre National de la Recherche Scientifique Francia Contributo UE Nessun dato Indirizzo 13397 Marseille Mostra sulla mappa Costo totale Nessun dato Kharkov State University Ucraina Contributo UE Nessun dato Indirizzo 310077 Kharkov Mostra sulla mappa Costo totale Nessun dato Moscow Institute of Steel and Alloys Russia Contributo UE Nessun dato Indirizzo 117936 Moscow Mostra sulla mappa Costo totale Nessun dato Scientific Research Institute ULTRAM Russia Contributo UE Nessun dato Indirizzo 103030 Moscow Mostra sulla mappa Costo totale Nessun dato