Abstract：Oxide dispersion strengthened (ODS) steels was fabricated by gas atomized and ball milling powders via spark plasma sintering (SPS) at 900-1 100 ℃, hot rolling and annealing. Microstructure and mechanical properties of these alloys were investigated by means of X-ray diffraction (XRD), metallographic analysis (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and mechanical testing such as micro-hardness and tensile testing. The results show that sintering temperature, hot rolling and heat treatment can greatly affect the microstructure and properties of ODS iron-based alloys. With the increase of sintering temperature, the original particle interface is gradually eliminated, the porosity of the alloy decreased, the density is increased, the tensile strength and microhardness increase. The tensile strength of the alloys sintered at 900, 1 000 and 1 100 ℃ are 191, 392 and 814 MPa respectively. After rolling and annealing, the tensile strength and elongation of steel sintered at 900 ℃ increase. After rolling, the tensile strength of the alloy sintered at 1 100 ℃ increases to 1 003 MPa, and the elongation is 6.48%. After heat treatment, the tensile strength decreases to 915 MPa, and the total elongation increases to 9.77%.
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2020, Vol. 25 
