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A Statistical Method for Screening Composite Inclusions in Steel

A technology of composite inclusion and statistical method, applied in computing, image analysis, instrumentation, etc.

Active Publication Date: 2021-07-23
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 statistical method for screening composite inclusions in steel, which solves the problem of repeated statistics of corrected composite particles

Method used

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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

Examples

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

A statistical method for screening compound inclusions in steel belongs to the technical field of statistical measurement of non-metallic inclusions in steel. The steps are to perform automatic statistics of non-metallic inclusions first, and obtain all inclusion information through automatic scanning, and the total number of inclusions counted is N 0 ; Then carry out multiple screening, select all the heavy element inclusions in the statistical results, and find out the surrounding light element inclusions; judge the shape of the inclusions, and judge whether the heavy element inclusions overlap with the light element inclusions; record all overlapping The number of pairs of light element inclusions and heavy element inclusions is N a ;Calculate the total number of inclusions N contained in it b and the total number of composite inclusions N c ;Number of actual inclusions N m For: N m =N 0 –N b +N c . Finally, an analysis report is given. The advantage is that it automatically corrects the problem that the composite inclusions are divided into several independent inclusions for multiple measurements and statistics, so that the statistical results conform to 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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Patent Type & Authority Patents(China)
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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