Microstructure and Properties of Fe-12Cr-2.5W-xSi-0.4Ti-0.3Y2O3 Alloys

Fe-12Cr-2.5W-xSi-0.4Ti-0.3Y(2)O(3) alloys were fabricated by mechanical alloying and vacuum sintering. The effect of sintering temperature and Si content on the microstructure and properties of the alloy was investigated systematically. The experimental results show that the relative density and tensile strength of the alloy were increased with the elevating of sintering temperature and Si content within a certain range. The alloy with 1wt% Si sintered at 1 350 & DEG;C exhibited superior properties, and the relative density and tensile strength were 96.8% and 692.7 MPa, respectively. HAADF and EDAX analysis of nano-precipitation in the matrix indicated that Si could combine with Y, Ti, and O in the sintering process, which was uniformly distributed with the size of 10 nm. Portion of Y2O3 had not completely dissolved in the milling process, which was retained in the matrix of the alloy.