Microstructure and mechanical properties of austenitic ODS steel processed using Ni–20Cr

Austenitic oxide dispersion strengthened (AODS) steel of composition Fe–22Ni–18Cr–1.5W–0.22Ti–0.35Y 2 O 3 (wt%) was fabricated using Ni–20Cr (instead of commonly used Ni) in second–stage ball milling. Mechanical alloying process for producing AODS powder was studied by measuring the yield and average size of milled powder. After 5 h of second–stage milling, the yield/s of milled powder was found to be 75% with Ni–20Cr and 42% with Ni. AODS powder was subsequently consolidated using hot extrusion and solution annealed. The consolidated samples exhibited austenitic grain size of 0.43 ± 0.19 µm along with Y 2 Ti 2 O 7 dispersoids of size