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Aggressive agent for displaying IF steel grain boundary and aggression method

An etchant and grain boundary technology, applied in the preparation of test samples, etc., can solve the problems of cumbersome etching steps and experimental failures, and achieve the effects of clear grain boundaries and grain characteristics, simple method and short etching time.

Inactive Publication Date: 2019-11-19
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: the purpose of the present invention is to provide an etchant and an erosion method for displaying IF steel grain boundaries, to solve the problem that the existing method requires two kinds of etchant, the corrosion steps are cumbersome, and it is easy to cause the problem of experimental failure

Method used

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  • Aggressive agent for displaying IF steel grain boundary and aggression method
  • Aggressive agent for displaying IF steel grain boundary and aggression method
  • Aggressive agent for displaying IF steel grain boundary and aggression method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Grind the IF steel sample on 600#, 1000#, 1500#, 2000# silicon carbide water sandpaper in turn, and then polish it with 0.5μm diamond grinding paste on the polishing machine until the surface of the sample has no obvious scratches and is as bright as a mirror. , followed by cleaning the surface with anhydrous ethanol and drying with a hair dryer for corrosion. Take 5ml of perchloric acid solution with a weight percentage of 70-72%, pour it into 95ml of absolute ethanol, and stir evenly. Connect the sample to the positive pole of the DC power supply, use copper or stainless steel as the negative pole, place the positive pole and the negative pole opposite each other and put them in the corrosive liquid, the voltage is 26V, the current is 1.8A, the time is 20s, and the temperature is 20°C, then take it out The sample was cleaned and dried, and the results of light microscopy were as follows: figure 2 As shown, clear grain boundaries and grain characteristics can be obse...

Embodiment 2

[0028] Grind the IF steel sample on 600#, 1000#, 1500#, 2000# silicon carbide water sandpaper in turn, and then polish it with 0.5μm diamond grinding paste on the polishing machine until the surface of the sample has no obvious scratches and is as bright as a mirror. , followed by cleaning the surface with anhydrous ethanol and drying with a hair dryer for corrosion. Take 7ml of perchloric acid solution with a weight percentage of 70-72%, pour it into 93ml of absolute ethanol, and stir evenly. Connect the sample to the positive pole of the DC power supply, use copper or stainless steel as the negative pole, place the positive pole and the negative pole opposite each other and place them in the corrosive liquid, the voltage is 24V, the current is 1.6A, the time is 13s, and the temperature is 30°C, then take it out Samples were washed, dried, and examined by light microscopy. image 3 As shown, clear grain boundaries and grain characteristics can be observed.

Embodiment 3

[0030] Grind the IF steel sample on 600#, 1000#, 1500#, 2000# silicon carbide water sandpaper in turn, and then polish it with 0.5μm diamond grinding paste on the polishing machine until the surface of the sample has no obvious scratches and is as bright as a mirror. , followed by cleaning the surface with anhydrous ethanol and drying with a hair dryer for corrosion. Take 5ml of perchloric acid solution with a weight percentage of 70-72%, pour it into 95ml of absolute ethanol, and stir evenly. Connect the sample to the positive pole of the DC power supply, use copper or stainless steel as the negative pole, place the positive pole and the negative pole opposite each other and place them in the corrosive liquid, the voltage is 26V, the current is 1.9A, the time is 10s, and the temperature is 20°C, then take it out Samples were washed, dried, and examined by light microscopy. Figure 4 As shown, clear grain boundaries and grain characteristics can be observed.

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Abstract

The invention discloses an aggressive agent for displaying the IF steel grain boundary and an aggression method. The aggressive agent comprises the following ingredients in the following proportions:5 to 10 percent of perchloric acid and 90 to 95 percent of absolute ethyl alcohol. The invention also discloses a method for performing aggression by using the aggressive agent. The grain boundary aggressive agent and the aggression method provided by the invention have the advantages that the steps are simple; the time is short; the operation is convenient; and the clear IF steel grain boundary and crystal grain features can be fast obtained.

Description

technical field [0001] The invention relates to an etchant and an erosion method, in particular to an etchant and an erosion method for displaying IF steel grain boundaries. Background technique [0002] IF steel, that is, interstitial-free steel, is widely used in the manufacture of automotive panels due to its excellent deep-drawing properties. In actual production, the C and N atoms in the steel are often fixed by adding a small amount of Ti and Nb to obtain a pure ferritic steel without interstitial atoms. The size and shape of the ferrite grains will directly affect the performance of the steel . [0003] Since there are almost no interstitial atoms at the grain boundary of IF steel, and it is a pure ferrite structure at room temperature, it is difficult to obtain clear grain boundaries and grain characteristics by conventional nitric acid etchant, which will affect the grain size of the sample. The evaluation of the degree of hardness level and the average intercept ...

Claims

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Application Information

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IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 彭红兵唐尧颉震汪晓勇周超洋
Owner JIANGSU UNIV OF SCI & TECH