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Method for extracting and observing three-dimensional appearance of non-metallic inclusion in steel in full-scale mode

A technology for non-metallic inclusions and three-dimensional morphology, which is used in the field of non-destructive full-scale extraction and observation of non-metallic inclusions in steel, which can solve the problem that the morphology and size of inclusions are greatly different, the inclusions cannot be maintained, and they are not representative. To solve problems such as sex, to achieve the effect of short cycle, simple method and short processing cycle

Active Publication Date: 2012-07-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] It is difficult to observe the three-dimensional shape of non-metallic inclusions in steel intuitively with traditional methods for detecting inclusions
The metallographic method can only obtain the plane two-dimensional morphology of the inclusions, and the morphology of the inclusions will show huge differences with the distance from the observation surface, especially the three-dimensional complex Al 2 o 3 , this method is not representative of
Although the large-scale electrolysis method can extract inclusions, due to the long electrolysis cycle, complicated elutriation and filtration, and the fact that the electrolyte is an acidic solution in many cases, many inclusions can no longer maintain their original shape during the process. The shape and size of the observed inclusions are also quite different from the real shape

Method used

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  • Method for extracting and observing three-dimensional appearance of non-metallic inclusion in steel in full-scale mode
  • Method for extracting and observing three-dimensional appearance of non-metallic inclusion in steel in full-scale mode
  • Method for extracting and observing three-dimensional appearance of non-metallic inclusion in steel in full-scale mode

Examples

Experimental program
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Effect test

Embodiment 1

[0037] By adopting the technical scheme of the invention, a certain Al deoxidized B-containing steel is sampled and analyzed. First, process the steel sample taken into a thin plate sample of 120mm×70mm×4mm, and polish each surface of the sample with 800# sandpaper to make the surface smooth; then use ultrasonic cleaning in acetone solution to remove the oil stains on the surface ; Secondly, configure the electrolyte, the proportion of the electrolyte: 1.5% tetramethylammonium chloride, 8% triethanol ammonium, 90.5% is propylene carbonate; the sample plate to be electrolyzed is used as the anode, the stainless steel plate is used as the cathode, and the insulated copper The wire connects the stainless steel plate to the cathode of the power supply, the sample is connected to the anode of the power supply, and the current density is controlled to 0.05A / cm 2 , electrolysis time 24h; after electrolysis, pour the electrolyte and anode mud into a 500ml large beaker, and clean the s...

Embodiment 2

[0041]By adopting the technical scheme of the invention, a certain Si-Al deoxidized Ti-containing steel is sampled and analyzed. First, process the steel sample taken into a thin plate sample of 100mm×50mm×3mm, and polish each surface of the sample with 800# sandpaper to make the surface smooth; then use ultrasonic cleaning in acetone solution to remove oil stains on the surface ; Secondly, configure the electrolyte, the proportion of the electrolyte: 1.0% tetramethylammonium chloride, 5.0% triethanolammonium, 94.0% is propylene carbonate; the sample plate to be electrolyzed is used as the anode, the stainless steel plate is used as the cathode, and the insulated copper The wire connects the stainless steel plate to the cathode of the power supply, the sample is connected to the anode of the power supply, and the current density is controlled to 0.05A / cm 2 , electrolysis time 24h; after electrolysis, pour the electrolyte and anode mud into a 500ml large beaker, and clean the s...

Embodiment 3

[0045] By adopting the technical solution of the present invention, a certain Al deoxidized steel is sampled and analyzed. First, process the steel sample taken into a thin plate sample of 160mm×90mm×5mm, and polish each surface of the sample with 800# sandpaper to make the surface smooth; then clean the sample plate with ultrasonic waves in acetone solution to remove oil stains on the surface ; Secondly, configure the electrolyte, the proportion of the electrolyte: 3.0% tetramethylammonium chloride, 10.0% triethanolammonium, 87.0% is propylene carbonate; the sample plate to be electrolyzed is used as the anode, the stainless steel plate is used as the cathode, and the insulated copper The wire connects the stainless steel plate to the cathode of the power supply, the sample is connected to the anode of the power supply, and the current density is controlled to 0.05A / cm 2 , the electrolysis time is 72h; after electrolysis, pour the electrolyte and anode mud into a 500ml large ...

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Abstract

The invention is applied to the technical field of steel making and continuous casting and discloses a method for extracting and observing three-dimensional appearance of non-metallic inclusion in steel in full-scale mode. A steel sample is processed into a thin sheet of (100mm-160mm length)*(50-90mm width)*(3mm-5mm thickness) to be used as an electrolysis anode, a stainless steel thin sheet is used as a cathode, and an organic solution comprising, by weight percentage, 1% -3.0% of tetramethylammonium chloride, 5%-10% of triethanolamine and the balance propylene carbonate is adopted as electrolyte. Current density is controlled to be 0.05A / cm<2>-0.08A / cm<2>, and electrolysis time is controlled to be 24h to 72h. The non-metallic inclusion with different grain size ranges can be obtained after multiple filtrations and separations. The three-dimensional appearance of the non-metallic inclusion with the different grain size ranges can be observed clearly under a scanning electron microscope or a field emission electron microscope. The method is simple in operation, short in cycle and comprehensive in information for reflecting inclusion and has important meaning for understanding and controlling the non-metallic inclusion in the steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting. The invention provides a method for extracting and observing non-metallic inclusions in steel in a full size without damage and a sample preparation process; through this method, steelmaking and continuous casting processes can be obtained. The three-dimensional morphology characteristics of non-metallic inclusions in different particle size ranges in the steel matrix, these features have a crucial impact on the shape control, floating removal, and improvement of the cleanliness of molten steel in the steelmaking process. , The field of continuous casting has important reference and guiding significance. Background technique [0002] Non-metallic inclusions in steel are extremely harmful to the quality of steel. Irregular inclusions in steel, especially large-grained inclusions, often become the source of stress fatigue during use, and lead to product scrap in severe ca...

Claims

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Application Information

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IPC IPC(8): G01B11/24G01N23/22G01N1/28
Inventor 王敏包燕平王毓男李怡宏彭尊
Owner UNIV OF SCI & TECH BEIJING
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