Corrosion liquid and corrosion method for ultralow steel original austenite crystal boundary

A technology of austenite grain boundary and corrosion solution, which is applied in the field of ultra-low carbon steel, can solve the problems of time-consuming and reagents, unavailable, unsatisfactory results, etc., and achieve the advantages of simple processing, energy saving and labor intensity reduction Effect

Inactive Publication Date: 2015-02-25
苏州华碧微科检测技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is suitable for corroding the austenite grain boundary of low carbon steel under quenching, but it is not ideal for corroding the original austenite grain boundary of ultra-low carbon steel. It not only consumes time and reagents, but also cannot obtain clear original austenite grain. boundary

Method used

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  • Corrosion liquid and corrosion method for ultralow steel original austenite crystal boundary

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1, an etching solution for the prior austenite grain boundary of ultra-low steel, according to parts by volume, the components include 20 parts of supersaturated picric acid, 2 parts of detergent, and 1 part of hydrochloric acid, that is, 10 ml of supersaturated picric acid , 1ml detergent, 0.5ml hydrochloric acid. Wherein the concentration of hydrochloric acid is 37%. The detergent can be Goldfish brand dishwashing liquid, the material is easy to obtain and the price is cheap.

[0023] A method for etching the corrosion solution of the ultra-low steel prior austenite grain boundary as claimed in claim 1, comprising the following steps:

[0024] Step 1) cutting and sampling the ultra-low carbon steel and performing metallographic grinding and polishing;

[0025] Step 2) Soak the polished ultra-low carbon steel in the corrosion solution for 200 seconds;

[0026] Step 3) Scrub with saturated oxalic acid solution after corrosion, and blow dry. There is no req...

Embodiment 2

[0029] Example 2. The difference between Example 2 and Example 1 is that the corrosion solution is made by mixing 9.5ml supersaturated picric acid, 0.9ml detergent, and 0.4ml hydrochloric acid, and the soaking corrosion time is 220 seconds.

[0030] In this embodiment, the amount of reagent used is small, and the soaking time is extended appropriately to achieve a good corrosion effect and reduce the damage of the reagent to the operator.

Embodiment 3

[0031] Example 3. The difference between Example 3 and Example 1 is that the corrosion solution is made by mixing 10.5ml of supersaturated picric acid, 1.1ml of detergent, and 0.6ml of hydrochloric acid, and the immersion corrosion time is 180 seconds.

[0032] In this embodiment, the corrosion effect is good, the corrosion time is short, and the operation time and labor intensity can be reduced.

[0033] The invention has the advantages of simple configuration of materials, reduced configuration cost, simple operation, easy manual control, small deviation and good austenite grain boundary.

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Abstract

The invention discloses corrosion liquid and a corrosion method for an ultralow steel original austenite crystal boundary. The corrosion liquid comprises the following components in parts by volume: 19-21 parts of supersaturated picric acid, 1.8-2.2 parts of a detergent and 0.8-1.2 parts of hydrochloric acid, wherein the concentration of the hydrochloric acid is 37%, and the detergent is cleanser essence. The corrosion method for the ultralow steel original austenite crystal boundary by using the corrosion liquid comprises the steps of (1) sampling ultralow carbon steel by cutting and then carrying out metallographic grinding and polishing on the sampled ultralow carbon steel; (2) soaking the polished ultralow carbon steel into the corrosion liquid for corrosion; (3) by the end of the corrosion process, scrubbing the ultralow carbon steel with a saturated oxalic acid solution, and blow-drying; (4) after blow-drying, observing the ultralow carbon steel by a metallographic microscope to obtain an original austenite structure figure, wherein the soaking time is 180-220 seconds in the step (2). By the corrosion liquid and the corrosion method, the time is shortened, the reagent is saved, and the clear original austenite crystal boundary can be obtained.

Description

technical field [0001] The invention relates to the field of ultra-low carbon steel, in particular to an etching solution and an etching method for the original austenite grain boundary of ultra-low steel. Background technique [0002] The microstructure and morphology of prior austenite in steel materials determine the microstructure and morphology of steel materials at room temperature, which has a great impact on the properties of steel materials. Different steel materials require different corrosion methods to obtain a clear original austenite structure. The research on the microstructure and morphology of the original austenite of ultra-low carbon martensite steel is of great significance to the development of new high-strength and high-toughness steel. [0003] The corrosion method of the original austenite grain boundary under the quenching structure of ultra-low carbon steel, the general process is to cut and sample the produced ultra-low carbon steel, and then perf...

Claims

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Application Information

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IPC IPC(8): G01N1/32
Inventor 夏志伟
Owner 苏州华碧微科检测技术有限公司
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