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Corrosion liquid and corrosion method for original austenite grain boundary of medium carbon steel

A technology of austenite grain boundary and corrosive liquid, which is applied in the field of metallographic structure observation, can solve the problems that the original austenite grain boundary cannot be well displayed, the grain size cannot be accurately measured, and long-term effectiveness cannot be guaranteed. The corrosion time is shortened, the effect is excellent, and the configuration is simple

Pending Publication Date: 2018-12-14
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the corrosion method is carried out under the condition of heating a certain temperature, the process is more complicated and time-consuming
In addition, traditional etchants cannot display the original austenite grain boundaries well, cannot accurately measure and evaluate the grain size, and cannot guarantee long-term effectiveness
[0004] "The application of carbon tetrachloride in the display of the original austenite grain boundary of steel" (Peng Yougen, Taiyuan Institute of Mechanical Engineering) discloses an etchant, but this etchant needs to limit the addition sequence of carbon tetrachloride, otherwise it will be easy Layering or insoluble paste will affect the effect of displaying the original austenite grain boundary, even if it is prepared in the given order, it cannot guarantee long-term effectiveness

Method used

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  • Corrosion liquid and corrosion method for original austenite grain boundary of medium carbon steel
  • Corrosion liquid and corrosion method for original austenite grain boundary of medium carbon steel
  • Corrosion liquid and corrosion method for original austenite grain boundary of medium carbon steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Metallographic sample preparation:

[0048] Cut 10×10×8mm samples from 51CrV4 steel samples, heat them at different temperatures and cool them in oil (quenching temperatures are 850°C, 880°C, 910°C respectively, and hold for 1 hour). After ultrasonic cleaning, the The detection surface is roughly ground, finely ground, and polished by conventional methods, and then rinsed with absolute ethanol and dried.

[0049] (2) Corrosion solution preparation

[0050] The corrosion solution raw materials are distilled water, 37% (quality) hydrochloric acid, picric acid, carbon tetrachloride, ethanol and Lafang brand shampoo. Wherein the ratio of each component is: H 2 O: 40mL, 37% (mass) hydrochloric acid: 2mL, picric acid: 4g, CCl 4 : 4mL, ethanol: 10mL, Lafang brand shampoo: 5mL.

[0051] The preparation method of the corrosion solution is to put distilled water in a beaker, add ethanol, then slowly add hydrochloric acid, picric acid, carbon tetrachloride and Lafang brand...

Embodiment 2

[0056] (1) Metallographic sample preparation:

[0057] Cut 10×10×8mm samples from 51CrV4 steel samples, heat them at different temperatures and cool them in oil (quenching temperatures are 850°C, 880°C, 910°C respectively, and hold for 1 hour). After ultrasonic cleaning, the The detection surface is roughly ground, finely ground, and polished by conventional methods, and then rinsed with absolute ethanol and dried.

[0058] (2) Corrosion solution preparation

[0059] The raw materials of the corrosion solution include distilled water, 37% (mass) hydrochloric acid, picric acid, carbon tetrachloride, ethanol and Lafang brand shampoo. Wherein the ratio of each component is: H 2 O: 40mL, 37% (mass) hydrochloric acid: 3mL, picric acid: 5g, CCl 4 : 5mL, ethanol: 10mL, shampoo: 6mL.

[0060] The preparation method of the corrosion solution is to first put distilled water in a beaker, add ethanol, then slowly add hydrochloric acid, picric acid, carbon tetrachloride and Lafang bran...

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Abstract

The invention discloses a corrosion liquid and a corrosion method for an original austenite grain boundary of medium carbon steel. The corrosion liquid comprises water, hydrochloric acid, picric acid,carbon tetrachloride, ethanol and LaFang shampoo in the ratio being (38-42 mL):(2-3 mL):(4-5 g):( 4-5 mL) (9-11 mL) (5-6 mL), wherein the concentration of hydrochloric acid is 36%-38% (by mass). Firstly, distilled water is put in a beaker, ethanol is added, hydrochloric acid, picric acid, carbon tetrachloride and LaFang shampoo are sequentially and slowly added randomly, and finally, the mixtureis stirred and mixed uniformly. The preparation method of the corrosion liquid is simple and the corrosion liquid can be stored for a long time.

Description

technical field [0001] The invention relates to the technical field of metallographic structure observation, in particular to an etching solution and an etching method for the original austenite grain boundary of medium carbon steel. Background technique [0002] When the steel is heated above the critical point, austenitization (the austenite at this time is called original austenite, and its grain boundary is the original austenite grain boundary) is cooled at different speeds to obtain different structures, but the original austenite The densitic grain boundaries have not disappeared. The size of prior austenite grains has a great influence on the mechanical properties and process properties of steel, and the coarse prior austenite grains are an important factor leading to the formation and propagation of cracks along grain boundaries. In addition, the coarseness of grains often reduces the impact toughness, fatigue limit and corrosion resistance of steel. This shows th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N1/32
CPCG01N1/32G01N21/84
Inventor 张晓东夏佃秀王守仁薛传艺颜新宇付坤
Owner UNIV OF JINAN
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