Effects of plastic deformations on microstructure and mechanical properties of ODS-310 austenitic steel

ODS-310 austenitic steel (Fe-25Cr-20Ni-0.35Y(2)O(3)-0.5Ti) was fabricated by the process of mechanical alloying and hot isostatic pressing. Plastic deformations, including forging and hot rolling, were applied to the as-hipped samples to improve the ductility. Microstructural evolutions in samples under different fabrication conditions were characterized by TEM. Tensile properties were tested at 23 degrees C and 700 degrees C. Dispersed oxide particles with sizes between 10 nm and 50 nm were characterized to be rich in Y-Ti-O. UTS and elongation of the as-hipped sample were 904 MPa and 11% respectively at 23 degrees C. Elongation increased two times after plastic deformations while there was only slight decrease in strength properties. (C) 2012 Elsevier B.V. All rights reserved.