Tailoring mechanical properties of nano-structured Eurofer 97 steel for fusion applications

Pawel M. Kozikowski ,  Agnieszka T. Krawczyńska ,  Malgorzata Lewandowska ,  Krzysztof J. Kurzydlowski 

Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland

Abstract

EUROFER 97 steel is a candidate structural material for the future fusion reactors and Test Blanket Modules (TBMs). In the present work microstructure of Eurofer 97 was modified by hydrostatic extrusion in multi-step process with total true strain exceeding 3.
TEM observations showed that HE causes significant grain refinement from about 400 to 80 nm. This is accompanied by improvement of the tensile mechanical properties and microhardness. On the other hand, there is a clear decrease in the resistance to brittle fracture as measured in the Charpy impact tests.
In order to improve strength/ductility/fracture toughness balance, the extruded samples were annealed for 1 hour at temperature range of 473-1073K. The results obtained for samples after post-extrusion annealing are discussed in terms of the microstructure (grain size, precipitation, dislocations) relationship to the properties of Eurofer steel.

 

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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium H, by Pawel M. Kozikowski
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-09 20:34
Revised:   2009-06-07 00:44