Steel austenite grain size etchant and preparation method and application thereof

A technology of austenite grain and steel austenite, applied in the field of etchant application, can solve the problems of high level requirements of inspectors, toxicity, difficult to grasp, etc., to solve the problem of polluting the environment, affecting public safety, and saving time and cost, the effect of simple and easy to master

Pending Publication Date: 2022-02-25
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the above method is used to etch the grain boundary, on the one hand, picric acid has been listed as an environmental pollutant and its use is restricted in large quantities because of its explosiveness, flammability, and toxicity, so as to avoid polluting the environment and affecting public safety; On the other hand, the oxidation method requires the use of a heat treatment furnace to perform high-temperature oxidation treatment on the sample. The high-temperature oxidation treatment process and the subsequent sample preparation process are complex, requiring high levels of inspection personnel, difficult to master, easy to make mistakes, and waste time and cost.

Method used

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  • Steel austenite grain size etchant and preparation method and application thereof
  • Steel austenite grain size etchant and preparation method and application thereof
  • Steel austenite grain size etchant and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A steel austenite grain size etchant comprises carboxyl compound, surfactant and diluent. Wherein, the carboxyl compound is oxalic acid, the surfactant is sodium dodecylbenzenesulfonate, and the diluent is water and ethanol. On a mass basis, the component ratio of oxalic acid and sodium dodecylbenzenesulfonate is 1:0.2, and the ratio of the mass sum of oxalic acid and sodium dodecylbenzenesulfonate to the mass of diluent is 5.5: 100; in the diluent, the mass ratio of water and ethanol is 8:1. The steel austenite grain size etchant in this embodiment is obtained by uniformly mixing the above raw materials.

[0031] The etchant of this embodiment is used to etch the train wheel steel (ER8). Before the etching, the steel is heat-treated according to the direct hardening method in GB / T6394 "Metal Average Grain Size Measurement Method", and observed with a metallographic microscope. , the obtained austenite grain size result is 8.0 grade as figure 1 shown. Depend on fig...

Embodiment 2

[0033] A steel austenite grain size etchant comprises carboxyl compound, surfactant and diluent. Wherein, the carboxyl compound is oxalic acid, the surfactant is sodium dodecylbenzenesulfonate, and the diluent is water and ethanol. In terms of mass, the component ratio of oxalic acid and sodium dodecylbenzenesulfonate is 1:0.25, and the mass ratio of the mass sum of oxalic acid and sodium dodecylbenzenesulfonate to the diluent is 6:100 ; The mass ratio of water and ethanol is 6.5:1. The steel austenite grain size etchant in this embodiment is obtained by uniformly mixing the above raw materials.

[0034] Adopt the etching agent of present embodiment to etch train wheel steel (ER9), and observe with metallographic microscope, the austenite grain size result that obtains is 8.0 grades such as figure 2 shown. Depend on figure 2 It can be seen that the etching effect of this embodiment is good, the grain boundaries (black thin lines) of the train wheel steel (ER9) are clear,...

Embodiment 3

[0036] A steel austenite grain size etchant comprises carboxyl compound, surfactant and diluent. Wherein, the carboxyl compound is oxalic acid, the surfactant is sodium lauryl sulfate, and the diluent is water and ethanol. In terms of mass, the mass ratio of oxalic acid and sodium lauryl sulfate is 1:0.1, the ratio of the mass sum of oxalic acid and sodium lauryl sulfate to the mass of diluent is 7:100, water and ethanol The mass ratio is 6.5:1. The steel austenite grain size etchant in this embodiment is obtained by uniformly mixing the above raw materials.

[0037] Adopt the etchant of present embodiment to etch train wheel steel (CL60), and observe with metallographic microscope, the austenite grain size result that obtains is 8.0 grades such as image 3 shown. Depend on image 3 It can be seen that the etching effect of this embodiment is good, the grain boundaries (black thin lines) of the train wheel steel (CL60) are clear, and the grains are completely displayed.

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Abstract

The invention provides a steel austenite grain size etchant and a preparation method and application thereof, the steel austenite grain size etchant comprises a carboxyl compound, a surfactant and a diluent, and the carboxyl compound is one of p-acetic acid or oxalic acid; the surfactant is any one of lauryl sodium sulfate, sodium dodecyl benzene sulfonate or dishwashing liquid; and the diluent is a mixed solution of water and ethanol. When the etchant is used for etching a steel material, a high-temperature oxidation treatment process is not needed, a direct hardening method is adopted, a grain boundary is directly and chemically etched, the operation is simple and easy to master, error detection is not prone to occurring, and time and cost can be saved. The etchant provided by the invention can clearly display grain boundaries of wheel steel, carbon structural steel and low-medium carbon alloy steel sample grains, the grain size is clear and complete under 100 times, the grain size is easy to grade, and the effect is good. In addition, the problems that in the prior art, picric acid reagents pollute the environment and affect public safety can be solved.

Description

technical field [0001] The invention relates to the application field of etchant, in particular to a steel austenite grain size etchant and its preparation method and application. Background technique [0002] The austenite grain size of steel has a great influence on mechanical, physical properties, chemical properties and heat treatment. Therefore, the evaluation of austenite grain size is very important for judging the quality of steel and checking the correctness of thermal processing technology. etc. are of great significance. [0003] The display of austenite grain size of iron and steel materials generally adopts direct hardening method, oxidation method, and corrosion by reagents such as saturated picric acid, picric acid and sodium dodecylbenzenesulfonate mixed solution. However, when the above method is used to etch the grain boundary, on the one hand, picric acid has been listed as an environmental pollutant and its use is restricted in large quantities because o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32G01N15/02
CPCC23F1/28G01N1/32G01N15/0205
Inventor 陈钰王艳阳陈玉宝陈军赵志海喻能利后宗保程亚南付声丽王仲琨李奕
Owner MAANSHAN IRON & STEEL CO LTD
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