Characterization method for distinguishing multi-phase sinter in hot-rolled silicon steel

Abstract

The invention relates to a characterization method for distinguishing multi-phase sinter in hot-rolled silicon steel, and belongs to the technical field of status analysis of steel and iron materials. The method adopts an electron probe and an EBSD (electron backscatter diffraction) device arranged on a scanning electronic microscope for micro-structural characterization on four phases of Fe2O3, Fe3O4, FeO and Fe2SiO4 on the surface of the polished hot-rolled silicon steel. The method comprises the following steps: according to the diversities of L Beta / L Alpha peak intensity ratios of the Fe elements in different valence states, through the adoption of the status analysis of the electron probe to resolve three typical oxides of Fe, and the use of the middle-phase resolution function of the EBSD technology to distinguish Fe2SiO4, the in-depth research on the microstructures of the sinter containing different phases is carried out in order to eventually realize the comprehensive characterization of the multi-phase sinter.

Description

technical field [0001] The invention belongs to the technical field of state analysis of iron and steel materials, and in particular relates to a technology combining an electronic probe and EBSD (Electron Backscatter Diffraction) to distinguish Fe on the surface of hot-rolled silicon steel. 2 o 3 , Fe 3 o 4 , FeO and Fe 2 SiO 4 Analytical method for four phases of oxide scale. Background technique [0002] The microstructure of scale during hot rolling is an important index to measure the surface quality of hot rolled silicon steel sheets. The composition of hot-rolled scale is mainly Fe 2 o 3 (hematite), Fe 3 o 4 (magnetite) and FeO (wurstite), and the thickness of the three-layer phase is relatively close at high temperature. However, the growth and structure of iron oxide scale are obviously affected by alloying elements. For example, the silicon content in silicon steel is relatively high, so it is easy to form fayalite (FeO 2SiO2) at the interface between ste...

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Problems solved by technology

[0003] For the traditional method and existing problems of researching hot-rolled silicon steel oxide scale: ① Electron probe surface analysis method, this method is to use the surface analysis function in the electronic probe to obtain the distribution state of each element in the oxide scale, but it cannot accurately explain The valence state distribution of elements; ②Electron probe state analysis method, this method is based on different valence states of Fe element L β / L α The difference in peak intensity ratio can distinguish the oxide of Fe, but for silicon steel, the oxide scale is rich in Si element, which has a great influence on the Fe element L β / L α The peak intensity ratio has a certain influence, and the accurate analysis of complex iron oxide scale phases cannot be carried out; ③EBSD phase analysis method, the principle of this method is that the electron beam interacts with the surface of the inclined sample, and the diffracted electrons produced carry a large amount of structural information. The distribution of scales with different structures can be obtained by the analysis of the Kikuchi zone, but the efficiency of this method is low, and it often takes a long time to distinguish the phases of different structures, and it is difficult to completely calibrate the complex scales containing silicon

[0006] (1) The literature "Electronic probe analysis of the state of iron oxide scale on steel surface" cannot distinguish more complex iron oxide scale phases

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