Effects of Consolidation Process on the Microstructure and Mechanical Properties of ODS Ferritic Alloy
The oxide-dispersion-strengthened (ODS) ferritic alloy powders (Fe-14Cr-3Al-2W-0.1Ti-0.35Y2O3) were prepared by mechanical alloying (MA) at a rotation speed of 720 rpm for 24 h. All the elements were mixed homogenously in the powder, and Cr and Al dissolved in α-Fe after MA. The bulk samples were produced by spark plasma sintering (SPS) at 950 and 50 MPa and by hot isostatic pressing (HIP) at 1150 and 130 MPa, respectively. The SPS sample showed a tensile strength of 730 MPa and a poor ductility due to the existence of pores in microsize. The HIP sample had a high tensile strength of 980 MPa, yield strength of 710 MPa and elongation of 10.3 %. The excellent mechanical properties of the HIP sample was due to the small grain size of the matrix of about 400 nm and the fine oxide particles of 5-40 nm.
Yafang Han, Junpin Lin, Chengbo Xiao and Xiaoqin Zeng
T. Liu et al., "Effects of Consolidation Process on the Microstructure and Mechanical Properties of ODS Ferritic Alloy", Materials Science Forum, Vols. 747-748, pp. 507-512, 2013