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Study of Nano-cluster Formation in Fe-18Cr ODS Ferritic Steel by Atom Probe Tomography

Published online by Cambridge University Press:  01 February 2011

Olena Kalokhtina ,
Bertrand Radiguet ,
Yann de Carlan  and
Philippe Pareige
Olena Kalokhtina
Affiliation:
[email protected], GPM-UMR CNRS6634- Université et Insa de Rouen, Saint Etienne du Rouvray, France
Bertrand Radiguet
Affiliation:
[email protected], GPM-UMR CNRS6634- Université et Insa de Rouen, Saint Etienne du Rouvray, France
Yann de Carlan
Affiliation:
[email protected], CEA,DEN,DMN,SRMA, Saclay, France
Philippe Pareige
Affiliation:
[email protected], GPM-UMR CNRS6634- Université et Insa de Rouen, Saint Etienne du Rouvray, France
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Abstract

A high chromium ferritic Oxide Dispersion Strengthened steel was produced by mechanical alloying of Fe-18Cr-1W-0.3Ti-0.3Ni-0.15Si and 0.5% Y2O3 (wt.%) powders in industrial attritor, followed by hot extrusion at 1100°C. The material was characterized by Atom Probe Tomography on each step of manufacturing process: as-milled powder and in final hot extruded state. In addition, to get information on clustering kinetics the powder was also characterized after annealing at 850°C during 1 hour. Atom Probe Tomography revealed that the oxide dispersion strengthened steel Fe-18Cr contains nanometer scale yttrium- and oxygen-enriched nanoclusters in as-milled state. Their evolution is shown after subsequent annealing and hot extrusion. More well defined nanophases also enriched in Ti are observed. A mechanism of their formation is proposed. Mechanical alloying results in supersaturated solid solution with presence of small Y- and O-enriched clusters. Subsequent annealing stimulates incorporation of Ti to the nucleii that were previously formed during mechanical alloying.

Keywords

mechanical alloyingpowder metallurgynanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1264: Symposia Z/BB – Basic Actinide Science and Materials for Nuclear Applications , 2010 , 1264-BB03-04
Copyright
Copyright © Materials Research Society 2010

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