Abstract:Advanced oxide dispersion strengthened (ODS) technology prepared oxide dispersion strengthened steel has excellent mechanical properties and corrosion resistance. The powder mixing technology, preparation process, microstructure, mechanical properties and strengthening mechanism of ODS steel are described. High quality second phase particles and metal powder are the basis of ODS steel raw materials preparation. Nano-structured oxide particles are added to the metal matrix, and metal powder raw materials are usually prepared by ball milling alloying method. Among them, Y2O3, Al2O3 and other nano-oxides are commonly used as dispersion strengthened particles of ODS steel. Microstructure and mechanical properties of ODS steel material depends on its preparation technology, the traditional smelting and casting method for ODS steel preparation is relatively difficult, while powder metallurgy method is commonly used, including hot extrusion, hot isostatic pressure, the spark plasma sintering process and so on. Additive manufacturing technology is a new way for preparation of ODS steel, especially selective laser melting method has been used to develop the ODS stainless steel. In Y2O3-containing ODS steel, the metal elements (Ti, Al, Zr, etc.) that are easy to combine with oxygen react with Y and O in the matrix, and then precipitate in the form of complex oxides in the microstructure. A large number of dispersive distributed second phase particles can nail grain boundaries and dislocation and hinder dislocation movement, thus playing a dispersion strengthening effect, improving the mechanical properties and corrosion resistance of advanced ODS steel and expanding its application range.
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