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Etching agent for rapidly displaying ultrafine austenite grains and thermal erosion method thereof

A technology of austenite grains and etchant, which is applied in the fields of etchant and thermal erosion to quickly display ultra-fine austenite grains, can solve the problem of unsatisfactory erosion effect, and achieve rapid and clear display of grains highly reliable results

Inactive Publication Date: 2012-04-04
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] Compared with the documents or patents mentioned above, most of them are for one or several steel grades, or the etchant used under certain process conditions, and some corrosion effects are not ideal

Method used

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  • Etching agent for rapidly displaying ultrafine austenite grains and thermal erosion method thereof
  • Etching agent for rapidly displaying ultrafine austenite grains and thermal erosion method thereof
  • Etching agent for rapidly displaying ultrafine austenite grains and thermal erosion method thereof

Examples

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Effect test

example 1

[0035] A Steel Classic figure 1 Quenching treatment in the process shown, in which the heating temperature in Stage II is 900°C and the holding time is 5s. Cut the section of the thermal simulation sample along the direction perpendicular to the compression axis near the thermocouple, after mechanical grinding and polishing, immerse the section in figure 2 60°C etchant (100ml saturated picric acid aqueous solution + 1ml CuCl 2 Solution + 0.5ml HF acid + 1ml xylene) erosion for 5s, after wiping and drying with ethanol, observe the austenite structure under an optical microscope as image 3 shown.

example 2

[0037] B steel classics figure 1 Quenching treatment in the process shown, in which the heating temperature in Stage II is 900°C and the holding time is 500s. Cut the section of the thermal simulation sample along the direction perpendicular to the compression axis near the thermocouple, after mechanical grinding and polishing, immerse the section in figure 2 60°C etchant (100ml saturated picric acid aqueous solution + 1ml CuCl 2 Solution + 0.5ml HF acid + 1ml xylene) erosion for 8s, after wiping and drying with ethanol, observe the austenite structure under an optical microscope as Figure 4 shown.

example 3

[0039] B steel classics figure 1 Quenching treatment in the process shown, in which the heating temperature in Stage II is 950°C and the holding time is 500s. Cut the section of the thermal simulation sample along the direction perpendicular to the compression axis near the thermocouple, after mechanical grinding and polishing, immerse the section in figure 2 60°C etchant (150ml saturated picric acid aqueous solution + 1.5ml CuCl 2 Solution + 1ml HF acid + 1ml xylene) erosion for 10s, after wiping and drying with ethanol, observe the austenite structure under an optical microscope as Figure 5 shown.

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Abstract

The invention discloses an etching agent for rapidly displaying ultrafine austenite grains and a thermal erosion method thereof. The etching agent comprises a saturated aqueous solution of picric acid, a saturated aqueous solution of CuCl2, HF acid and xylene, wherein, the volume ratio of the ingredients is 100-200:1-1.5:0.5-1.5:1-2. The thermal erosion method comprises the following steps: grinding and polishing a sample, then immersing the section in a 60-70 DEG C etching liquid for carrying out thermal erosion with the erosion time of 5-15 s, and then cleaning the section through wiping with anhydrous alcohol, and drying. According to the invention, the rapid and clear display of ultrafine-grained austenite can be realized by using a formula of a few reagents and reasonable assembly, and the invention provides reliable conditions for accurately measuring the grain size of ultrafine-grained austenite.

Description

technical field [0001] The invention belongs to the technical field of physical detection, and in particular relates to an etchant and a thermal erosion method for rapidly displaying ultrafine austenite grains. Background technique [0002] The austenite grain size of steel has a great influence on the strength, toughness, fatigue resistance and other performance indicators of steel, and it is an indispensable research method for studying the hereditary structure of steel. Therefore, the detection of austenite grain size is of great significance, and its display method has also been continuously discussed by the majority of scientific researchers. [0003] Whether the austenite grain boundary can be clearly etched depends on many factors such as the chemical composition of the sample, heat treatment state, etchant and erosion conditions. There are many methods of attacking austenite grain boundaries involved so far, as shown in Table 1. [0004] Table 1 Prior austenite gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
Inventor 姚圣杰李广龙
Owner ANGANG STEEL CO LTD
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