A method for preparing in-situ nanoparticle-strengthened q195 steel

Abstract

The invention belongs to the field of steel materials and relates to a method for manufacturing in-situ nano-particle strengthening Q195 steel. The method is characterized by comprising the steps that in the smelting and casting processes, Fe-Ti alloy wires with phi ranges from 0.1mm to 1mm are added, pressure is exerted on the inner portion of a vessel, so that a pressure field is formed, centrifugal force or electromagnetic mixing is exerted on a molten body, so that a flow field is formed, molten metal flows, growth of a precipitated phase is restrained, the thick precipitated phase is prevented from being generated, and therefore nanometer strengthening steel alloy is formed; in the casting process, the molten body flows, and the linear flow speed of the molten body is not lower than 1.7m / s; alloying elements Ti and O, of precipitated-phase titanium oxide, higher than a matrix alloy melting point are contained in the molten body, the solubility of Ti and O is reduced along with the reduction of temperature, so that casting alloy of a nanometer titanium oxide in-situ precipitated phase is formed, the strength of the steel is improved, the ductility and the toughness of the steel are not reduced to a large extent, and the performance of the steel is further improved through the following rolling and cooling control processes.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and relates to a method for preparing Q195 steel strengthened by in-situ nanoparticles. Background technique [0002] Steel materials have been used for thousands of years, but for a long time, people have mainly used ferrite plus pearlite steel, which has low strength, high carbon content in steel, and relatively simple structure type. A large number of studies at home and abroad have shown that even if a certain amount of alloying elements are added to this type of steel, or the ferrite grain ultrafine technology such as strain-induced phase transformation is used, if the strength, plasticity, toughness, and For comprehensive properties such as machinability, the highest yield strength that can actually be used can only be around 500MPa. When higher-strength steel is required, the traditional method can only be to use tempered martensitic quenched and tempered steel. This type of steel ...

AI Technical Summary

Problems solved by technology

When higher-strength steel is required, the traditional method can only be to use tempered martensitic quenched and tempered steel. This type of steel needs to add a higher amount of alloy to ensure hardenability, resulting in a large cost of steel increase, a large amount of precious alloy resources are consumed, while the production process is long, the investment in process equipment increases, and the energy consumption increases significantly

Although the strength of steel can reach 500-1000MPa after quenching and tempering, the comprehensive mechanical properties can also be adjusted appropriately, but the welding performance of steel is poor

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