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A method for displaying the grain boundaries of prior austenite in medium-manganese steel for automobiles

A technology of austenite grain boundary and display method, which is applied to the display field of prior austenite grain boundary of medium manganese automobile steel, can solve the problems of inconvenient use, cumbersome experimental operation, expensive experimental detection and the like, and achieves corrosion resistance. Fast, easy-to-use effects

Active Publication Date: 2019-01-08
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many research experts use EBSD to measure the size of austenite grains. Although this method has good experimental results, it is inconvenient to use, and the experimental operation is cumbersome and expensive.

Method used

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  • A method for displaying the grain boundaries of prior austenite in medium-manganese steel for automobiles
  • A method for displaying the grain boundaries of prior austenite in medium-manganese steel for automobiles
  • A method for displaying the grain boundaries of prior austenite in medium-manganese steel for automobiles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The method for displaying the grain boundaries of prior austenite in medium-manganese automobile steel comprises the following steps:

[0066] Step 1. Sample Preparation

[0067] (1) Sample processing: Take medium manganese automobile steel, the content of which is by mass percentage: C: 0.05%, Si: 0.01%, Mn: 3%, Al: 1.0%, V: 0.03%, Ti: 0.03%, Nb: 0.03%, P: 0.07%, S: 0.005%, and the balance is Fe; processed into a cylinder, and the surface is polished to obtain a cylindrical sample with a diameter of 6mm and a height of 10mm, and the surface finish of the cylindrical sample is above ▽7;

[0068] (2) Thermal deformation treatment: The cylindrical sample is thermally compressed and deformed on a thermal simulation test machine. The deformation temperature is 700°C, the strain rate is 0.01 / s, and the strain is 20%. After the deformation is completed, it is quenched in water immediately to form a cake-shaped sample ;

[0069] (3) Sample cutting and inlaying: divide the ca...

Embodiment 2

[0089] The method for displaying the grain boundaries of prior austenite in medium-manganese automobile steel comprises the following steps:

[0090] Step 1. Sample Preparation

[0091] (1) Sample processing: Take medium-manganese automobile steel, the content of which is by mass percentage: C: 0.1%, Si: 0.05%, Mn: 5%, Al: 1.5%, V: 0.05%, Ti: 0.05%, Nb: 0.05%, P: 0.05%, S: 0.01%, and the balance is Fe; processed into a cylinder, and the surface is polished to obtain a cylindrical sample with a diameter of 6mm and a height of 12mm, and the surface finish of the cylindrical sample is above ▽7;

[0092] (2) Thermal deformation treatment: The cylindrical sample is thermally compressed and deformed on a thermal simulation test machine. The deformation temperature is 800°C, the strain rate is 0.05 / s, and the strain is 30%. After the deformation is completed, it is quenched in water immediately to form a cake-shaped sample. ;

[0093] (3) Sample cutting and inlaying: divide the cak...

Embodiment 3

[0113] The method for displaying the grain boundaries of prior austenite in medium-manganese automobile steel comprises the following steps:

[0114] Step 1. Sample Preparation

[0115] (1) Sample processing: Take medium-manganese automobile steel, the content of which is by mass percentage: C: 0.3%, Si: 0.5%, Mn: 7%, Al: 1.8%, V: 0.08%, Ti: 0.07%, Nb: 0.08%, P: 0.05%, S: 0.03%, and the balance is Fe; processed into a cylinder, and the surface is polished to obtain a cylindrical sample with a diameter of 7mm and a height of 12mm, and the surface finish of the cylindrical sample is above ▽7;

[0116] (2) Thermal deformation treatment: Thermal compression deformation is performed on the cylindrical sample on a thermal simulation test machine. The deformation temperature is 900°C, the strain rate is 0.1 / s, and the strain amount is 40%. ;

[0117] (3) Sample cutting and inlaying: divide the cake-shaped sample into two along the direction of the central axis, cut the central long...

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Abstract

The invention relates to a display method of an austenitic grain boundary of medium-manganese steel for an automobile, and belongs to the technical field of metallography sample preparation and austenitic grain boundary display. The method comprises the following steps that a metallography sample is processed and subjected to thermal deformation treatment, the metallography sample section is cut and inlaid, rough grinding, fine grinding and polishing treatment are conducted, etching is conducted on the polished metallography sample with sodium bisulfite etchant and nitric acid alcohol etchant successively, and observation is conducted; the etching time is reasonably controlled till the austenitic grain boundary is displayed clearly. According to the display method of the austenitic grain boundary of the medium-manganese steel for the automobile, the operation process is simple and convenient, the austenitic grain boundary of the medium-manganese steel for the automobile can be clearly and fully displayed, and therefore accurate grain size statistical results are obtained, and a key technology is provided for research on the rolling property of the medium-manganese steel for the automobile at high temperature.

Description

Technical field: [0001] The invention belongs to the technical field of metallographic sample preparation and austenite grain display, and in particular relates to a method for displaying the original austenite grain boundary of medium-manganese automobile steel. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32G01N15/02G01N21/84
CPCG01N1/32G01N15/0205G01N21/84
Inventor 朱苗勇余海存王朝辉
Owner NORTHEASTERN UNIV LIAONING
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