A statistical method for screening composite inclusions in steel

A technology of compound inclusion and statistical methods, applied in computing, image data processing, measuring devices, etc.

Active Publication Date: 2019-01-29
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a statistical method for screening compos...

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  • A statistical method for screening composite inclusions in steel
  • A statistical method for screening composite inclusions in steel
  • A statistical method for screening composite inclusions in steel

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Experimental program
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Effect test

Embodiment 1

[0030] In the 380CL wheel steel with La and Ce rare earth elements, there are rare earth inclusions and Al / Mg inclusions, such as Figure 1 to Figure 6 shown. Polish the sample according to GB / T 30843 and keep the polished surface strictly level and fix it on the sample stage of Hitachi S3400 scanning electron microscope equipped with Oxford characteristic X-ray energy spectrometer. Inclusions were statistically analyzed, and the gray value of the digital image ranged from 0 to 255. Adjust the grayscale of the image so that the grayscale of the iron matrix is ​​around 150, set two threshold ranges: the lower threshold range is 5-69, and the upper threshold range is 180-249 for statistical analysis of inclusions, and a total of 3395 inclusions are obtained. The sequence is numbered 1, 2, ..., 3395. Among them, there are 2883 effective inclusions belonging to rare earth inclusions or light element inclusions. The output statistical results are subjected to multiple screening....

Embodiment 2

[0041] The free-cutting steel is added with elements such as Bi and Pb, and the inclusions include MnS inclusions and particles containing Bi and Pb, and the MnS inclusions are long strips. The sample was polished according to GB / T 30843 and the polished surface was kept strictly level and fixed on the sample stage of a Hitachi S3400 scanning electron microscope equipped with an Oxford characteristic X-ray energy spectrometer. The inclusion automatic analysis program Aztex Steel was used to analyze the non- Metal inclusions were statistically analyzed, and the gray value of the digital image ranged from 0 to 32767. Adjust the grayscale of the image so that the grayscale of the iron matrix is ​​around 25700, and the distribution of various inclusions is as follows Figure 7 shown. Two threshold ranges are set: the lower threshold range is 0-21466, and the upper threshold range is 28000-32767 for statistical analysis of inclusions, and a total of 1930 inclusions are obtained, n...

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Abstract

The invention relates to a statistical method for screening composite inclusions in steel, belonging to the technical field of statistical measurement of non-metallic inclusions in steel. First, the automatic statistics of non-metallic inclusions is carried out, and all inclusions are obtained by automatic scanning, and the total number of inclusions is N0; then multiple screening is carried out to select all the heavy element inclusions in the statistical results and to find out the light element inclusions around them. Judging the shape of inclusion, judging whether heavy element inclusion and light element inclusion overlap or not; the number of all overlapping pairs of light and heavy inclusions was recorded as Na, while the number of overlapping pairs of light and heavy inclusions wasrecorded as Na. The total inclusions Nb and the total composite inclusions Nc are calculated; the total number of inclusions Nm is Nm=N0-Nb+Nc. Finally, the analysis report is given. The invention has the advantages of automatically correcting the problem that the composite inclusions are divided into several independent inclusions for multiple measurement and statistics, so that the statisticalresults accord with the real situation of the sample.

Description

technical field [0001] The invention belongs to the technical field of statistical measurement of non-metallic inclusions in steel, in particular to a statistical method for screening composite inclusions in steel. A program for automatically counting non-metallic inclusions in steel through a scanning electron microscope configuration X-ray energy spectrum and automatic image analysis program. In particular, it relates to the use of the above-mentioned automatic statistical method to deal with samples containing inclusions of elements lighter than iron (aluminum, magnesium, calcium, silicon, etc.) and elements heavier than iron (rare earth elements, lead, bismuth, etc.). Background technique [0002] Non-metallic inclusions in steel (usually oxides, sulfides, nitrides and silicates, etc.) are usually generated during deoxidation, solidification and subsequent reactions of molten steel. Non-metallic inclusions have many influences on the properties of steel, so the research...

Claims

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Application Information

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IPC IPC(8): G06T7/00G01N23/2251
CPCG01N23/2251
Inventor 孟杨严春莲任群鞠新华
Owner SHOUGANG CORPORATION
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