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High manganese steel metallographic corrosive solution, and preparation method and corrosion method thereof

A configuration method and high-manganese steel technology, applied in the field of steel production, can solve the problems of not being able to truly display all grain boundaries, poor stability of aqua regia corrosive solution, unsuitable for high-manganese steel samples, etc., and achieve good and stable corrosion effect. Good reproducibility and reproducibility, easy to promote

Inactive Publication Date: 2021-03-12
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although FeCl 3 +HCl aqueous solution is the most commonly used, but it is extremely difficult to operate, because the corrosion rate of this etchant is too fast, it is difficult to grasp the degree of etching, and it is easy to cause the etched grain boundary to be unclear, and the surface of the etched sample is easy to become dirty. Not suitable for high manganese steel samples
After being etched by the corrosive solution of HCl+copper sulfate+water solution, all the grain boundaries cannot be truly displayed
The aqua regia corrosive solution has requirements on the processing state of the sample and is not suitable for all processing states. At the same time, the corrosion process has extremely high requirements for operators and time control requirements. Moreover, the aqua regia corrosive solution has poor stability and cannot be stored for a long time. , over time, the corrosive solution will lose its effectiveness

Method used

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  • High manganese steel metallographic corrosive solution, and preparation method and corrosion method thereof
  • High manganese steel metallographic corrosive solution, and preparation method and corrosion method thereof
  • High manganese steel metallographic corrosive solution, and preparation method and corrosion method thereof

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Embodiment Construction

[0018] A metallographic corrosion solution for high manganese steel provided in this embodiment and its configuration method and corrosion method are as follows:

[0019] (1) Use a balance to weigh out an appropriate amount of CrO 3 solid, add it to a beaker filled with water, stir evenly, and configure it as 10% CrO 3 aqueous solution;

[0020] (2) Slowly add dilute hydrochloric acid, dilute hydrochloric acid and CrO into the beaker 3 The volume ratio of the aqueous solution is 1:2, stir evenly with a glass rod while adding;

[0021] (3) Pour the prepared solution into the reagent bottle and keep it for later use;

[0022] (4) Grind the test surface of the high manganese steel sample with 23% manganese content with 180#, 400#, 600#, 800#, 1000#, 1200# water sandpaper, polish it into a scratch-free mirror surface, and then rinse it with clean water , spray with absolute ethanol, and dry with a hair dryer;

[0023] (5) Hold the polished sample with tweezers and immerse it ...

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Abstract

The invention discloses a high manganese steel metallographic corrosive solution, and relates to the technical field of steel production. The high manganese steel metallographic corrosive solution comprises dilute hydrochloric acid and a 10% CrO3 aqueous solution, and the volume ratio of the dilute hydrochloric acid to the CrO3 aqueous solution is 1: 2. The mixed solution of diluted hydrochloric acid and CrO3 aqueous solution is used for etching, austenite grain boundaries and twin boundaries can be clearly etched out, and meanwhile, the interior of a structure is clean without impurities.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a high manganese steel metallographic corrosion solution, a preparation method and a corrosion method thereof. Background technique [0002] After proper composition design, high manganese steel exhibits excellent strength, plasticity, low temperature toughness, work hardening and impact resistance safety, and shows broad application potential in locomotives, automobiles, low temperature containers, elevated buildings and other fields. Because high manganese steel contains ultra-high Mn, the Mn content is in the range of 15% to 30%, the Mn element expands the austenite phase region, strongly stabilizes the austenite, and twins appear in the austenite, and the structure twins and The etching conditions of austenite grain boundaries are different. It is difficult to etch austenite grain boundaries and twins at the same time with conventional nital etching solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 秦小梅张华伟赵亚娟
Owner NANJING IRON & STEEL CO LTD
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