Capability of mechanical alloying and SPS technique to develop nanostructured high Cr, Al alloyed ODS steels Articles uri icon

publication date

  • July 2014

start page

  • 1676

end page

  • 1684

issue

  • 13

volume

  • 30

International Standard Serial Number (ISSN)

  • 0267-0836

Electronic International Standard Serial Number (EISSN)

  • 1743-2847

abstract

  • Oxide dispersion strengthened (ODS) Fe alloys were produced by mechanical alloying (MA) with the aim of developing a nanostructured powder. The milled powders were consolidated by spark plasma sintering (SPS). Two prealloyed high chromium stainless steels (Fe-14Cr-5Al-3W) and (Fe-20Cr-5Alz3W) with additions of Y2O3 and Ti powders are densified to evaluate the influence of the powder composition on mechanical properties. The microstructure was characterised by scanning electron microscope (SEM) and electron backscattering diffraction (EBSD) was used to analyse grain orientation, grain boundary geometries and distribution grain size. Transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) equipped with energy dispersive X-ray spectrometer (EDX) were used to observe the nanostructure of ODS alloys and especially to observe and analyse the nanoprecipitates. Vickers microhardness and tensile tests (in situ and ex situ) have been performed on the ODS alloys developed in this work.

subjects

  • Chemistry
  • Materials science and engineering

keywords

  • material nanostructured; mechanical alloying; oxide dispersion strengthened; spark plasma sintering; spark plasma sintering; nano-structured; ods steels; oxide dispersion strengthened; mechanical alloying