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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

A method for displaying original austenite grain boundaries in medium-manganese automobile steel, which belongs to the technical fields of metallographic sample preparation and austenite grain boundary display. The method includes the following steps: after processing, the metallographic sample is subjected to thermal deformation treatment, and is cut. After the cross-section of the metallographic sample is mounted, it is subjected to rough grinding, fine grinding, and polishing. The polished metallographic sample is etched and observed using sodium bisulfite etching solution and nitric acid alcohol etching solution. Through reasonable control of the etching time, , until the original austenite grain boundaries are clearly displayed, the operation process of this method is simple and convenient, and can clearly and completely display the original austenite grain boundaries of medium manganese automotive steel, thereby obtaining accurate grain size statistical results, which is Research on the rolling properties of manganese automotive steel at high temperatures provides key technologies.

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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