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Method of representing microstructure of scale on section of hot-rolled steel plate by adoption of EBSD

A technology for iron oxide scale and hot-rolled steel sheet, which is applied in the direction of material analysis, measuring device, and instrument using wave/particle radiation, and can solve the problems of fragile, difficult to prepare iron oxide scale samples, and poor electrical conductivity.

Active Publication Date: 2014-06-04
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method of using EBSD to characterize the microstructure of iron oxide scale on the cross-section of hot-rolled steel plate, which solves the problem of difficult preparation of iron oxide scale samples that are easily broken and has poor electrical conductivity, and overcomes the inability to accurately and quantitatively characterize iron oxide scale by other detection means For the problem of microstructure, select the crystallographic parameters of iron oxide scale in the subsequent EBSD surface scan, use the structural information to distinguish each phase, and accurately characterize the microscopic morphology, phase composition, and grain size of iron oxide scale

Method used

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  • Method of representing microstructure of scale on section of hot-rolled steel plate by adoption of EBSD
  • Method of representing microstructure of scale on section of hot-rolled steel plate by adoption of EBSD

Examples

Experimental program
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Effect test

Embodiment 1

[0021] This example is to prepare a cross-sectional sample of iron oxide scale of Q345 hot-rolled plate, observe the iron oxide scale with a scanning electron microscope to obtain EBSD surface scanning data, and analyze the microstructure of the scanned area on the basis of phase composition analysis. The specific technical steps are:

[0022] 1. Preparation of oxide scale cross-section samples of hot-rolled plates

[0023] 1.1 Bonded sample

[0024] Generally speaking, the thickness of the hot-rolled iron oxide scale is only a few microns, and the surface of the oxide scale block sample can be bonded with another plate-shaped test block. The bonding can make there is no gap between the sample and the thin plate, increasing the test The sample thickness is also convenient for subsequent grinding and polishing samples. One method uses 502 glue for bonding, and the other method uses conductive tape for bonding.

[0025] 1.2 Cutting sample:

[0026] The cutting of the sample ...

Embodiment 2

[0055] In this example, samples were prepared for the oxide scale cross section of a 550CL hot-rolled plate, and the oxide scale was observed with a scanning electron microscope to obtain EBSD surface scanning data, and the microstructure analysis was performed on the scanned area on the basis of phase composition analysis.

[0056] The specific technical steps are:

[0057] Steps 1 and 2 use the same method as Embodiment 1, except that 502 glue is used when bonding the sample, and then the sample is subjected to step 1.6 coating treatment. For EBSD analysis, the coating of the sample should be very thin, and the thickness range is 2- 5nm, the coating material is made of carbon, which overcomes the charging phenomenon of the scanning electron microscope;

[0058] 3. EBSD surface scan data analysis

[0059] 3.1 Removal of noise and mislabeling

[0060] Using the Oxford Instruments (Channel5) data processing module, put this project into the phase analysis interface, use to re...

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Abstract

The invention relates to a method of representing a microstructure of scale on a section of a hot-rolled steel plate by adoption of EBSD, and belongs to the technical field of physical property examination of metal materials. The phase, the orientation, the stress state, and other data of a sample, which are obtained by back scattering diffraction information formed by irradiating electron beams onto the surface of the sample, are utilized to analyze a crystalline-state material. The back scattering signals are very sensitive to the surface of the sample, and therefore the sample used for EBSD observation needs high flatness and the least stress layers as possible. The method is advantageous in that: problems of scale sample preparation difficulties, namely, easy breakage and poor conductive performance, are solved; a scale section representing problem of the hot-rolled steel plate is solved; scale crystallographic parameters are selected in subsequent EBSD surface scanning; each phase is indentified by utilization of structural information; and the microcosmic conformation, the phase composition and the crystal grain size of the scale are represented accurately, thus achieving accurate qualitative / quantitative representation of the scale on the section of the hot-rolled steel plate.

Description

technical field [0001] The invention belongs to the technical field of metal material physical performance inspection. In particular, it relates to a method of using EBSD (electron backscattering diffraction technique) to characterize the microstructure of iron scale on the cross-section of hot-rolled steel plate. Background technique [0002] The microstructure of hot-rolled steel oxide scale is one of the essential factors that determine the pickling performance of hot-rolled strip steel. In theory, the phase composition of scale is generally composed of 2 to 3 oxides with different components, namely FeO, Fe 2 o 3 and Fe 3 o 4 , it can be seen from the ferrite phase diagram that the oxygen content of each phase is not constant and exists within a certain range. The crystal structures of the three iron oxide scales are different, FeO is a sodium chloride type ionic crystal, Fe 3 o 4 It is a magnetic black crystal, Fe 2 o 3 The crystal structure is corundum type (he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/203
Inventor 尹立新崔桂彬任群严春莲孟杨付百林鞠新华刘卫平
Owner SHOUGANG CORPORATION
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