Abstract
Ferritic oxide dispersion-strengthened alloys (ODS) are manufactured using a mechanical alloying process. The development of a coarse-grained microstructure during recrystallization has been detected and discussed by several authors, but the mechanism of grain growth remains uncertain. Recent work has emphasized the large influence of non-uniformities on the development of the recrystallized microstructure. The purpose of the present work is to study the effect of both slight heterogeneous plastic strains and strong directional deformation on recrystallization of a ferritic Fe-base ODS alloy.
Highlights
The first ferritic oxide dispersion-strengthened (ODS) alloys were developed by the Belgian
As the ferritic state makes the alloy resistant to radiation-induced swelling, and the aluminum content boosts the formation of a protective alumina layer against liquid metal embrittlement, some of the alloys of this family were intended for use in the manufacture of tubes for new-generation nuclear reactors cooled by liquid sodium at about 700 ◦ C [3]
For the shake of understanding the new concepts reported in this paper, we summarize the most relevant conclusions achieved on the recrystallization process in ODS FeCrAl alloys
Summary
The first ferritic oxide dispersion-strengthened (ODS) alloys were developed by the BelgianNuclear Research Center (SCK CEN) in the 1960s in the frame of sodium-cooled fast breeders [1]because of their higher thermal conductivity, lower thermal expansion, and lower tendency toHe-embrittlement in comparison to austenitic alloys. The first ferritic oxide dispersion-strengthened (ODS) alloys were developed by the Belgian. A new generation of Fe-Cr-Al ferritic steels is being considered as structural material for new GEN-IV fission reactors [2]. As the ferritic state makes the alloy resistant to radiation-induced swelling, and the aluminum content boosts the formation of a protective alumina layer against liquid metal embrittlement, some of the alloys of this family were intended for use in the manufacture of tubes for new-generation nuclear reactors cooled by liquid sodium at about 700 ◦ C [3]. Fe-Cr-Al ferritic steels tend to undergo a marked loss in creep strength at temperatures in excess of 600 ◦ C; the ODS Fe-Cr-Al alloys discussed here can, in principle, be used at much higher temperatures, perhaps as high as 1100 ◦ C [4]. The most common means of introducing unmixable components such as ceramic oxide particles in a metallic matrix is by the mechanical alloying processing route, using high-energy
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