Method for analyzing sources of large inclusions in heavy rail steel

An analysis method and technology of inclusions, applied in the direction of analyzing materials, using wave/particle radiation for material analysis, measuring devices, etc., can solve the problem of imperfect and inaccurate judgment of the source of large inclusions

Pending Publication Date: 2022-03-25
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide an analysis method for the source of large-scale inclusions in heavy rail steel, and to solve the technical problem of incomplete and inaccurate judgment of the source of large-scale inclusions in the prior art

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  • Method for analyzing sources of large inclusions in heavy rail steel
  • Method for analyzing sources of large inclusions in heavy rail steel
  • Method for analyzing sources of large inclusions in heavy rail steel

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Experimental program
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Embodiment 1

[0114] This embodiment provides a method for analyzing the source of large inclusions in heavy rail steel, including the following steps:

[0115] S1. Obtain the alloy sample after grinding and polishing.

[0116] S2. Using a microscope to obtain the position and size of the inclusions in the alloy sample.

[0117] S3. Using an indenter to mark the inclusions with a size >300 μm to obtain large inclusions.

[0118] S4. Using scanning electron microscope and energy spectrum analyzer to analyze the composition of the large inclusions, the scanning electron microscope picture is shown in figure 2 , the energy spectrum analysis diagram sees image 3 .

[0119] S4.1. Analyzing the overall morphology of the large inclusions.

[0120] S4.1.1, by figure 2 It can be seen that the large inclusions are strip-shaped, consistent in color, and the ends are smooth, so it is judged that the large inclusions are sulfides. image 3 It can be seen that the sulfide is manganese sulfide.

Embodiment 2

[0122] S1. Obtain the alloy sample after grinding and polishing.

[0123] S2. Using a microscope to obtain the position and size of the inclusions in the alloy sample.

[0124] S3. Using an indenter to mark the inclusions with a size >300 μm to obtain large inclusions.

[0125] S4. Using scanning electron microscope and energy spectrum analyzer to analyze the composition of the large inclusions, the scanning electron microscope picture is shown in Figure 4 , the energy spectrum analysis diagram of steel slag is shown in Figure 5 , see the composition diagram of steel slag Image 6 , the energy spectrum analysis diagram of refractory material is shown in Figure 7 , see the refractory composition diagram Figure 8 .

[0126] S4.1. Analyzing the overall morphology of the large inclusions.

[0127] S4.1.2, by Figure 4 It can be seen that the large inclusions are irregular strips with clear boundaries and sharp edges and corners. It is judged that the large inclusions ar...

Embodiment 3

[0136] S1. Obtain the alloy sample after grinding and polishing.

[0137] S2. Using a microscope to obtain the position and size of the inclusions in the alloy sample.

[0138] S3. Using an indenter to mark the inclusions with a size >300 μm to obtain large inclusions.

[0139] S4. Using scanning electron microscope and energy spectrum analyzer to analyze the composition of the large inclusions, the scanning electron microscope picture is shown in Figure 9 , the energy spectrum analysis diagram of steel slag is shown in Figure 10 , see the composition diagram of steel slag Figure 11 , the energy spectrum analysis diagram of refractory material is shown in Figure 12 , see the refractory composition diagram Figure 13 .

[0140] S4.1. Analyzing the overall morphology of the large inclusions.

[0141] S4.1.2, by Figure 9 It can be seen that the large inclusions are irregular strips with clear boundaries and sharp edges and corners. It is judged that the large inclusio...

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Abstract

The invention particularly relates to a heavy rail steel large inclusion source analysis method, which belongs to the technical field of ferrous metallurgy, and comprises the following steps: obtaining a ground and polished alloy sample; obtaining the position and the size of the inclusion in the alloy sample; the inclusions with the size larger than 300 microns are marked, and large inclusions are obtained; analyzing the components of the large inclusions; and analyzing the source of the large inclusions according to the components. According to the analysis method, the specific positions of the inclusions in the alloy sample are determined through the first three steps, the large inclusions exceeding the standard in the inclusions are screened and then positioned one by one, all the components of the large inclusions are analyzed, the corresponding sources of all the components in the large inclusions are analyzed according to the components and the ranges corresponding to the components, and the content of the inclusions in the alloy sample is determined. After integration, the source of the large inclusions can be deduced perfectly and accurately.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a method for analyzing the source of large inclusions in heavy rail steel. Background technique [0002] Medium and large inclusions in heavy rail steel generally refer to the over-standard inclusions found in the inclusion inspection and flaw detection of the finished rail. Usually, the rolling length of the inclusions is greater than 300 μm, and the maximum size exceeds 1000 μm. The existence of large inclusions directly affects the fatigue performance of the rail, which will cause serious nuclear damage or even rail breakage, which will endanger the service life and driving safety of the rail. At present, there are many studies on the evolution and control measures of heavy rail steel inclusions, but there are few studies on how to reversely deduce the source of inclusions from the characteristics of the inclusions in the finished rail. [0003] The patent d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2251G01N23/2273
CPCG01N23/2251G01N23/2273
Inventor 郑建国康勃欧阳珉路朱敏周剑华王彦林
Owner 武汉钢铁有限公司
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