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Aggressive agent for displaying solidification genetic dendritic structure in high-carbon steel plate strip and display method

A technology of dendrite structure and etchant, which is applied in the field of metallographic inspection and analysis, can solve the problems of not being able to obtain the real solidification structure of the continuous casting slab of wire rod and the solidification condition of the continuous casting slab

Inactive Publication Date: 2014-04-02
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers have characterized the segregation of the continuous casting slab by observing the banded structure of the wire rod and measuring the carbon content in the center of the wire rod, but these methods can only indirectly characterize the performance of the continuous casting slab, and cannot obtain the corresponding carbon content of the wire rod. The real solidification structure of the continuous casting slab, so it is impossible to obtain the solidification conditions of the continuous casting slab, and guide the optimization of the continuous casting slab process
At present, there are no relevant patents or literature reports on obtaining the original solidified dendrite structure of the continuous casting slab by the method of wire rod erosion

Method used

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  • Aggressive agent for displaying solidification genetic dendritic structure in high-carbon steel plate strip and display method
  • Aggressive agent for displaying solidification genetic dendritic structure in high-carbon steel plate strip and display method
  • Aggressive agent for displaying solidification genetic dendritic structure in high-carbon steel plate strip and display method

Examples

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Embodiment 1

[0017] The analysis in this embodiment is the SWRH82B steel wire rod produced by a steel factory, and the carbon content is 0.82wt%.

[0018] After grinding the sample with a grinding wheel, grind it on 180#, 400#, 800# and 1000# water sandpaper in turn, and then polish it with 2.5μm and 1μm diamond grinding paste on the polishing disc until the surface of the sample is smooth without obvious scratches until. After polishing, rinse the surface with alcohol, wipe the stains on the surface of the sample with cotton, and then dry it with a hair dryer. Add 5.5g of water-sealed picric acid of analytical grade (purity ≥ 99.8%) into 100ml of distilled water, then add 10ml of white cat detergent, and stir evenly. Put the prepared etchant into a constant temperature water bath, heat and stabilize at 65°C. Put the surface of the prepared sample upwards, immerse in the etchant and corrode for about 13 seconds. After observing that the surface of the sample becomes dark, immediately tak...

Embodiment 2

[0020] This example analyzes the SWRH82B steel wire rod (with surface scarring defects) produced by a steel factory, with a carbon content of 0.82wt%

[0021] After grinding the sample with a grinding wheel, grind it on 180#, 400#, 800# and 1000# water sandpaper in turn, and then polish it with 2.5μm and 1μm diamond grinding paste on the polishing disc until the surface of the sample is smooth without obvious scratches until. After polishing, rinse the surface with alcohol, wipe the stains on the surface of the sample with cotton, and then dry it with a hair dryer. Add 7g of analytically pure (purity ≥ 99.8%) picric acid sealed in water into 100ml of distilled water, then add 25ml of white cat detergent, and stir evenly. Put the prepared etchant into a constant temperature water bath, heat and stabilize at 72°C. Put the surface of the prepared sample upwards, immerse in the etchant and corrode for about 20 seconds. After the surface of the sample is observed to become dark, ...

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Abstract

The invention relates to an aggressive agent for displaying a solidification genetic dendritic structure in a high-carbon steel plate strip and a display method. The aggressive agent comprises the following components: 100ml of distilled water by volume, 5-8g of picric acid by mass and 5-30ml of cleanser essence by mass. The display method comprises the steps of heating and stabilizing the aggressive agent to 60-80 DEG C through a constant-temperature water bath kettle, then putting a prepared sample into the aggressive agent and aggressing for 10-30 seconds, washing the surface of the sample by using ethyl alcohol, and drying, so that the dendritic structure can be observed by using a metallographic microscope. The method has the advantages of being simple to operate and quick to display, and the structure is clear and reliable; through the solidification genetic dendritic structure in the plate strip, a corresponding solidification process condition during continuous casting can be obtained so as to provide technical base for improving plate strip quality and optimizing continuous casting process.

Description

technical field [0001] The invention belongs to the technical field of metallographic inspection and analysis, and in particular relates to an etchant and a display method for displaying solidified hereditary dendrite structures in high-carbon steel wire rods. Background technique [0002] The solidification structure and properties of continuous casting slab have a great influence on the structure and properties of high carbon steel wire rod. When there is serious segregation in the center of the high carbon steel continuous casting slab, it is easy to form defects such as reticulated cementite and martensite in the center of the wire rod; Defects such as scarring and warped skin are formed on the surface. If the structure and performance of the wire rod can be compared with the continuous casting slab, not only can the information such as the position of the wire rod defect corresponding to the continuous casting slab be obtained, but also help to judge the cause of the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
Inventor 周青峰马建超王雷李平
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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