Microstructure and mechanical properties of spark plasma sintered austenitic ODS steel

In this work, austenitic oxide dispersion strengthened (AODS) steel of composition Fe–16Cr–16Ni–1.5 W–0.21Ti–0.3Y2O3 (wt. %) was fabricated using two–stage ball milling followed by consolidation through spark plasma sintering (SPS). the first–stage, mechanical alloying (MA) ferritic powder and nano sized Y2O3 carried out. This addition Ni in second–stage milling. SPS milled out at 900, 950, 1000 1050 °C to explore role temperature on density, microstructure as well properties consolidated samples. A relative density ∼ 99% obtained for samples sintered 950 °C. The as–sintered were subsequently solution annealed 1075 2 h water quenched. X–ray diffraction studies confirmed presence austenite Electron back scatter analysis all temperatures revealed a bimodal microstructure. average grain size 1.07 ± 0.72 µm Yield strength elongation same measured 851 MPa 18%, respectively room temperature. These values are best combination achieved AODS alloys processed MA SPS, which makes much promising high applications.