Method for qualitatively and quantitatively testing and analyzing impurities in steel

A technology for testing and analyzing inclusions, which is applied in the direction of material analysis by measuring secondary emissions, material analysis, and material analysis by optical means, which can solve the problems of inability to know the type of inclusions, large human errors, and large influence of parameter settings and other issues, to achieve the effects of small human influence factors, specific evaluation results, and accurate analysis and testing

Active Publication Date: 2018-09-28
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1. Electrolytic extraction-EDS method can obtain the shape, quantity and type of inclusions, etc., but the detection time of this method is long, the efficiency is low, and the human error is large; 2. The in-situ analysis method uses spark spectroscopy to detect inclusions. The particle size distribution and types of inclusions can be obtained, but the accuracy of inclusions detected by this method is limited, the detection size of inclusions is at the micron level, and the types of inclusions are not comprehensive enough; 3. The scanning electron microscope method has been popularized in recent years for the detection of inclusions A method that can obtain the shape, size, type and distribution of inclusions, etc., but the detection results of this method are greatly affected by the parameter settings during the test, and if the parameters are not set properly, there will be large errors in quantitative analysis
[0004] The Chinese patent application number is 201710616683.7 published a "automatic quantitative evaluation method for anisotropic tissue and inclusions". Although automatic quantitative detection of inclusions can be realized, the type of inclusions cannot be known, let alone the The precise shape information of the object, so this detection method has certain limitations
[0005] So far, there is still a lack of an accurate, simple qualitative and quantitative analysis test and evaluation method for different sizes, shapes and types of inclusions

Method used

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  • Method for qualitatively and quantitatively testing and analyzing impurities in steel
  • Method for qualitatively and quantitatively testing and analyzing impurities in steel
  • Method for qualitatively and quantitatively testing and analyzing impurities in steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Such as figure 1 As shown, according to the metallographic sample preparation method, the gear steel sample to be tested is ground and polished, and the inclusions of the sample to be tested are observed in a metallographic microscope. The size range is greater than 1 μm and below 20 μm. Used for signal strength calibration when searching for inclusions.

[0085] Put the sample into the sample chamber, and fix it on the corresponding supporting base to ensure that the working distance is about 17mm, and then vacuumize. When the vacuum degree reaches the requirement, turn on the power, accelerate the acceleration voltage and filament current. In this embodiment, the acceleration voltage setting value is 20Kv, and the test area is set by the two-point method. After confirming one point, focus to the clearest, and then move the sample Determine the position of another point on the platform, focus to the clearest, and the rectangular area determined by the two points is th...

Embodiment 2

[0090] Such as figure 2 As shown, after grinding and polishing the bearing steel sample according to the metallographic sample preparation method, the inclusions of the sample to be tested were observed in a metallographic microscope, most of the inclusions were in the size range of 1.5 μm, and an aluminum strip was pasted on the edge of the sample surface , used for signal strength calibration when searching for inclusions.

[0091] Put the sample into the sample chamber, and fix it on the corresponding supporting base to ensure that the working distance is about 17mm, and then vacuumize. When the vacuum degree reaches the requirement, the power is turned on, and the accelerating voltage and filament current are accelerated. In this embodiment, the setting value of the accelerating voltage is 20Kv, and the test area is set by the two-point method. After determining one point, focus to the clearest point, then move the sample stage to determine another point position, focus ...

Embodiment 3

[0096] Such as Figure 3 to Figure 4 As shown, two common carbon steel samples (1# and 2# in table 2) are selected, and the method of the present invention is used to evaluate the inclusions. First, the two samples are polished to ensure that the surface is smooth, smooth and free of foreign matter. Observing the inclusions of the sample to be tested in a metallographic microscope, most of the inclusions have a size range greater than 1 μm and less than 20 μm. Using the method of the present invention to detect inclusions, first paste a small piece of aluminum strip on the edge of the sample surface for Signal strength calibration when searching for inclusions. Put the sample into the sample chamber, and fix it on the corresponding supporting base so that the working distance is about 17mm, and then vacuumize it. When the vacuum degree reaches the requirement, turn on the power, accelerate the voltage and filament current. In this embodiment, the acceleration voltage setting ...

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Abstract

The invention provides a method for qualitatively and quantitatively testing and analyzing impurities in steel. The method includes the following steps of firstly, preparing a to-be-tested sample, wherein the to-be-tested sample is ground and polished, and the surface is clean, smooth and free of peculiar objects; secondly, observing the to-be-tested sample in a metallographic microscope, and determining the size range of the impurities; thirdly, adjusting testing parameters of a scanning electron microscope according to the impurity size range determined in the second step, and conducting scanning electron microscope testing and EDS energy spectrum component analysis on the to-be-tested sample to obtain size, shape and component data of the impurities in steel. By setting the component content standard, size and length standard and shape standard of the impurities in steel in application software and related accessories of the scanning electron microscope and setting the proper testing parameters according to the size of the impurities in steel, the properties of the impurities in steel can be accurately, qualitatively and quantitatively analyzed, analyzing and testing are accurate and comprehensive, artificial influence factors are small, and the evaluation result is specific, precise and visual.

Description

technical field [0001] The invention relates to the technical field of iron and steel material analysis and testing, in particular to a method for qualitative and quantitative testing and analysis of inclusions in steel. Background technique [0002] The detection of inclusions has not only become a necessary test item for iron and steel enterprises before leaving the factory, but also the focus of technical research and development personnel. However, there are many methods for inclusion detection, depending on the needs. At present, iron and steel enterprises usually use the national standard GB / T10561 metallographic grading method for detection. This method has high detection efficiency, but the detection results are not comprehensive, and it is impossible to accurately and quantitatively describe small inclusions. The size and quantity of inclusions are greatly influenced by human subjectivity, and the properties of inclusions cannot be analyzed objectively and accuratel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N23/22
CPCG01N21/84G01N23/22
Inventor 张淑兰王昌王辉李继康
Owner CENT IRON & STEEL RES INST
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