Effect of Zirconium on the Microstructure and Mechanical Properties of an Al-Alloyed ODS Steel Consolidated by FAHP Articles uri icon

publication date

  • January 2015

issue

  • 11

volume

  • 98

International Standard Serial Number (ISSN)

  • 0002-7820

abstract

  • The American Ceramic Society.An oxide dispersion strengthened (ODS) ferritic steel with nominal composition Fe-14Cr-5Al-3W-0.4Ti-0.25Y2O3-0.6ZrO2 was produced by mechanical alloying (MA), based on a prealloyed grade Fe-14Cr-5Al-3W steel with the addition of Ti element, Y2O3 and ZrO2, and subsequent consolidation by means of field assisted hot pressing (FAHP). The microstructure and the mechanical properties were analyzed and compared with a reference material with nominal composition Fe-14Cr-5Al-3W-0.4Ti-0.25Y2O3. The addition of zirconia increased the volume fraction of the smallest and equiaxed ferritic nano-grains and decreased the quantity of larger aluminum nano-oxides within the ferritic matrix, promoting the formation of fine zirconium nano-oxides and leading to the enhancement of the mechanical properties of the alloy.