Method for detecting evolution process of oxide inclusions in steel at high temperature

Abstract

The invention discloses a method for detecting the evolution process of oxide inclusions in steel at high temperature, and belongs to the technical field of steelmaking. The process comprises the steps that a core-shell heterostructure composed of an inner core and an outer shell wrapping the outer layer of the inner core is prepared through a fluidized vapor deposition method, the inner core is iron powder, the outer shell is an oxide inclusion layer of one of SiO2, TiO2, Al2O3 or MgO, then a steel block containing oxide inclusions is prepared through sintering, then the steel block is ground and polished, and the steel block is obtained; and fnally, the steel block is placed under a high-temperature confocal laser microscope, and the evolution process of the oxide inclusions in the steel block at the high temperature is observed through the high-temperature confocal laser microscope. The iron powder is coated with one of SiO2, TiO2, Al2O3 and MgO oxide inclusions through a fluidized vapor deposition method, so that the SiO2, TiO2, Al2O3 and MgO oxide inclusions in traditional steel are replaced, meanwhile, the oxide inclusions are introduced between the iron powder in a steel block through pressure sintering, and the evolution process of the oxide inclusions can be conveniently and rapidly observed at the high temperature.

Description

technical field [0001] The invention relates to the technical field of steelmaking, and more specifically relates to a detection method for the evolution process of oxidized inclusions in steel at high temperature. Background technique [0002] As we all know, the type, quantity, size, morphology and physical and chemical properties of inclusions in steel directly affect the quality and performance of steel products. According to the traditional understanding, the properties of the inclusions remain unchanged after the molten steel solidifies, but recent studies have shown that the subsequent heat treatment process experienced by the steel matrix will affect its internal inclusions. Solid-state reactions can occur between solid steel materials and inclusions, resulting in segregation of steel matrix components, denaturation of original inclusions, and precipitation of new inclusions, thereby affecting the properties of steel. Therefore, the analysis of the interface reactio...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem in the prior art that the reaction process between oxidized inclusions and billet solid cannot be well observed at high temperature, and to provide a detection method for the evolution process of oxidized inclusions in steel at high temperature ; The present invention is coated with SiO outside iron powder by fluidized vapor deposition method 2 、TiO 2 、Al 2 o 3 Or an oxide inclusion in MgO, thus replacing SiO in traditional steel 2 、TiO 2 、Al 2 o 3 , MgO oxidized inclusions, at the same time, the oxidized inclusions are introduced between the iron powder in the steel block by energized and pressurized sintering, so that it is convenient to quickly observe the evolution process of oxidized inclusions at high temperature, and solve the problem of adding a large amount of oxidized inclusions to molten steel in the past Inclusions are still hard to find their traces