Effect of yttrium addition on the microstructure and mechanical properties of ODS RAF steels Articles uri icon

publication date

  • December 2014

start page

  • 600

end page

  • 604

issue

  • 1-3

volume

  • 455

international standard serial number (ISSN)

  • 0022-3115

electronic international standard serial number (EISSN)

  • 1873-4820

abstract

  • An oxide dispersion strengthened (ODS) alloy with nominal composition Fe-14Cr-2W-0.3Ti-0.24Y (wt.%) was produced by mechanical alloying using elemental powders, and subsequent hot isostatic pressing. The microstructure of the material and characteristics of the oxide particle dispersion were investigated by electron microscopy. The effect of heat treatments on the microhardness and tensile properties at room temperature was also studied. The results show that a fine dispersion of Y-O-rich nanoparticles is achieved, together with larger (Cr, Ti)-rich precipitates. The absence of Ti is apparent in the majority of these nanoparticles, in contrast with reported results for ODS Ti-modified steels processed with Y2O3 addition. (C) 2014 Elsevier B.V. All rights reserved.

keywords

  • stability; titanium; alloys