Preparation method and observation method of medium manganese steel metallographic specimen

A metallographic sample, manganese steel technology, applied in the field of medium manganese steel metallographic sample preparation, can solve the problems of unclear metallographic structure, unsatisfactory metallographic corrosion effect, etc.

Inactive Publication Date: 2021-12-31
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commonly used metallographic etchants mainly include 3% to 4% nitric acid alcohol etchant and ferric chloride hydrochloride aqueous solution. These two metallographic etchants are not ideal for metallographic corrosion of duplex medium manganese steel, resulting in Organization is not clear

Method used

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  • Preparation method and observation method of medium manganese steel metallographic specimen
  • Preparation method and observation method of medium manganese steel metallographic specimen
  • Preparation method and observation method of medium manganese steel metallographic specimen

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preparation example Construction

[0030] The invention provides a method for preparing a medium manganese steel metallographic sample, comprising the following steps:

[0031] (1) The medium manganese steel is subjected to rough grinding and fine grinding successively to obtain a polished sample;

[0032] (2) electropolishing the polished sample obtained in the step (1) to obtain a polished sample; the electrolytic solution of the electropolishing includes perchloric acid glacial acetic acid solution or perchloric acid alcohol solution;

[0033] (3) Soak the polished sample obtained in the step (2) in sodium bisulfite solution for corrosion to obtain a metallographic sample of medium manganese steel.

[0034] The preparation method provided by the invention is applicable to medium manganese steel obtained by various thermal processing and heat treatment, preferably suitable for medium manganese steel containing ferrite and austenite structure. In the present invention, there is no special limitation on the pr...

Embodiment 1

[0056] The preparation method of medium manganese steel metallographic sample is the following steps:

[0057] (1) Process the medium manganese steel into a square sheet with a size of 10mm and a thickness of 0.4mm by wire cutting machine, and then pass it through 120 # 、240 # 、400 # and 800 # Grinding with silicon carbide sandpaper to obtain a sample with a thickness of 120 μm, and then after 1200 # Grinding with silicon carbide sandpaper to obtain a sample with a thickness of 60 μm, and finally punching to obtain a polished sample with a diameter of 3 mm; wherein, the fine grinding method is in the form of drawing "8";

[0058] The preparation method of medium manganese steel is as follows:

[0059] 1) Pretreatment before rolling: put the billet into a heating furnace and heat it from room temperature to 1200°C, and keep it warm for 4 hours to obtain a pretreated billet;

[0060] 2) hot rolling: the pretreated billet obtained in step 1) is first hot-rolled, then water-q...

Embodiment 2

[0066] The preparation method of medium manganese steel metallographic sample is the following steps:

[0067] (1) Process the medium manganese steel into a square sheet with a size of 10mm and a thickness of 0.4mm by wire cutting machine, and then pass it through 120 # 、240 # 、400 # and 800 # Grinding with silicon carbide sandpaper to obtain a sample with a thickness of 120 μm, and then after 1200 # Grinding with silicon carbide sandpaper to obtain a sample with a thickness of 60 μm, and finally punching to obtain a polished sample with a diameter of 3 mm; wherein, the fine grinding method is in the form of drawing "8";

[0068] The preparation method of medium manganese steel is as follows:

[0069] 1) Pretreatment before rolling: put the billet into a heating furnace and heat it from room temperature to 650°C, and keep it warm for 5 minutes to obtain a pretreated billet;

[0070] 2) Warm rolling: Warm rolling the pretreated steel slab obtained in step 1), and then imme...

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Abstract

The invention provides a preparation method and an observation method of a medium manganese steel metallographic sample, and belongs to the technical field of metallographic sample preparation. According to the method, firstly, medium manganese steel is subjected to coarse grinding and fine grinding, an oxide layer on the surface of the steel can be removed, then a perchloric acid glacial acetic acid solution or a perchloric acid alcohol solution is adopted as an electrolyte for electrolytic polishing, ferrite in the medium manganese steel can be corroded, the medium manganese steel is in a concave shape under a scanning electron microscope, and uncorroded austenite is in a convex shape. Then the steel is soaked in a sodium hydrogen sulfite solution, ferrite in the medium manganese steel can be further corroded by means of the corrosivity of the sodium hydrogen sulfite solution, the medium manganese steel is made to present the uneven morphology under a scanning electron microscope, and therefore the microstructure of the medium manganese steel is clearly displayed. Experimental results show that the metallographic specimen prepared by the preparation method provided by the invention can clearly display a microstructure when being observed by a scanning electron microscope, the concave microstructure is ferrite, and the convex microstructure is austenite.

Description

technical field [0001] The invention belongs to the technical field of metallographic sample preparation, and in particular relates to a preparation method and an observation method of a medium manganese steel metallographic sample. Background technique [0002] With the continuous progress and development of the automotive industry, energy saving, environmental protection and improved safety have become key technologies for the competition in the automotive industry. China is a country with a large sales volume of automobiles. At present, a lot of research and development work has been carried out on the research of automobile steel at home and abroad. The third-generation automotive steel with high strength and high plasticity has attracted people's attention. The strong-plastic product (the product of tensile strength and total elongation) is an important index to measure whether it meets the third-generation automotive steel. However, the main factor affecting this inde...

Claims

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Application Information

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IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 余海存吕玮王昊闫冰
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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