Method for in-situ processing and structural characterization of composite inclusion in steel

A technology of composite inclusions and inclusions, which is applied in the preparation of test samples, material analysis using radiation diffraction, material analysis using secondary emission measurement, etc., can solve the problem that in-situ observation of the microstructure of inclusions is difficult to achieve, etc. Achieve the effects of short sample preparation cycle, high processing efficiency and high analysis accuracy

Inactive Publication Date: 2015-03-25
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that it is difficult to observe the internal microstructure of inclusions in situ, and to provide a method for in-situ processing and structural characterization of composite inclusions in steel

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  • Method for in-situ processing and structural characterization of composite inclusion in steel
  • Method for in-situ processing and structural characterization of composite inclusion in steel
  • Method for in-situ processing and structural characterization of composite inclusion in steel

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Embodiment Construction

[0028] The technical solutions of the present invention will be further described below in conjunction with the examples.

[0029] (1) Use the focused ion beam to precisely locate and in-situ prepare the TEM profile samples of the composite inclusions of interest. The specific steps are as follows:

[0030] ① Plating Pt, in figure 1 Select an area of ​​interest on the inclusions selected in , try to include more information about the inclusions, and plate a strip-shaped Pt layer on the selected area, such as figure 1 (a) shown. The purpose of the Pt layer is to protect the sample during the subsequent ion beam processing.

[0031] ②For ion beam cutting, select the Rectangle mode and press figure 1 The three cutting frames shown in (a) were cut using high current. After that, the large current changes to a small current, and the Cleaning Cross Section mode is selected to refine the two surfaces of the sample so that the surface of the sample is as smooth as possible. After ...

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Abstract

The invention relates to a method for in-situ processing and structural characterization of a composite inclusion in steel. The method comprises the following steps: (1) accurately positioning and in-situ preparing a transmission electron microscope profile sample of an interesting composite inclusion by utilizing a focused ion beam; (2) analyzing element composition and element area distribution of the inclusion by virtue of an X-ray spectrometer attached on the transmission electron microscope; (3) obtaining a diffraction pattern of the low-index surface of each element gathered area in the inclusion by utilizing the electron diffraction technology of the transmission electron microscope; and (4) calibrating the phase corresponding to each diffraction spectrum by utilizing the diffraction pattern and combining the element composition and area distribution characteristics of the inclusion. According to the method, the phase distribution and composition of the interesting composite inclusion from core to surface can be quickly accurately obtained, a novel method is provided to studies on phase composition and formation mechanism inside the composite inclusion, and the defects of high randomness, low success rate, difficult inclusion completeness guarantee and the like of the composite inclusion transmission electron microscope sample can be overcome.

Description

technical field [0001] The invention belongs to the technical field of inclusion analysis of iron and steel materials, and in particular relates to an in-situ processing and structural characterization method of composite inclusions in steel. Background technique [0002] Inclusions are often used as an important indicator to measure the quality of steel, and various state factors such as their type, composition, shape, content, size, and distribution all affect the performance of steel. Inclusions in steel are mainly divided into single-structure inclusions and composite inclusions according to their composition. For single-structure inclusions, scanning electron microscopy combined with energy spectrometer or special inclusion analysis equipment is commonly used for analysis at present, while the analysis of composite inclusions is currently There is no dedicated equipment or specific method for characterization, which also limits the research on the reasons for the format...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22G01N23/20G01N1/28
Inventor 金传伟吴园园张珂洪慧敏
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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