High-nitrogen stainless steel EBSD test sample surface treatment method

A high-nitrogen stainless steel and surface treatment technology, applied in the preparation of test samples, etc., to achieve the effects of removing residual stress, satisfying EBSD observation effect, and high resolution

Inactive Publication Date: 2019-04-16
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This invention solves the problem of corrosion preparation of high-nitrogen stainless steel samples during EBSD testing, and provides a corrosive agent that can eliminate residual stress on the surface

Method used

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  • High-nitrogen stainless steel EBSD test sample surface treatment method
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  • High-nitrogen stainless steel EBSD test sample surface treatment method

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Effect test

Embodiment 1

[0027] The nitrogen content of the present embodiment high-nitrogen stainless steel is 0.6%, and its EBSD test sample surface treatment method comprises the following steps:

[0028] (1) Configure the corrosive agent required for EBSD corrosion, the corrosive agent ratio is: 30ml hydrochloric acid, 10ml nitric acid, 80ml absolute ethanol, 30ml glycerol;

[0029] (2) Prepare the sample to the size required for the EBSD test of width: 10mm, length: 10mm, thickness: 5mm, the upper and lower surfaces of the sample are parallel, and mark the rolling direction of the sample when cutting;

[0030] (3) Grind and polish the surface of the sample; use mechanical polishing, use 240 mesh, 400 mesh, 800 mesh, and 1000 mesh sandpaper in sequence, and adjust the sample at 90 degrees after each process of mechanical polishing is completed, so as not to observe The grinding marks of the previous process are used as the conditions for polishing; the polishing is mechanical polishing, using 2.5μ...

Embodiment 2

[0034] The nitrogen content of the present embodiment high-nitrogen stainless steel is 0.7%, and its EBSD test sample surface treatment method comprises the following steps:

[0035] (1) Configure the corrosive agent required for EBSD corrosion, the corrosive agent ratio is: hydrochloric acid 15ml, nitric acid 5ml, absolute ethanol 50ml, glycerol 10ml;

[0036] (2) Prepare the sample to the size required for the EBSD test of width: 8mm, length: 8mm, thickness: 4mm, the upper and lower surfaces of the sample are parallel, and mark the rolling direction of the sample when cutting;

[0037] (3) Grind and polish the surface of the sample; use mechanical polishing, use 240 mesh, 400 mesh, 800 mesh, and 1000 mesh sandpaper in sequence, and adjust the sample at 90 degrees after each process of mechanical polishing is completed, so as not to observe The grinding marks of the previous process are used as the conditions for polishing; the polishing is mechanical polishing, using 2.5μm d...

Embodiment 3

[0042] The nitrogen content of present embodiment high-nitrogen stainless steel is 0.8%, and its EBSD test sample surface treatment method comprises the following steps:

[0043] (1) Configure the corrosive agent required for EBSD corrosion, the corrosive agent ratio is: hydrochloric acid 20ml, nitric acid 8ml, absolute ethanol 60ml, glycerol 20ml;

[0044] (2) Prepare the sample to the size required for the EBSD test of width: 5mm, length: 5mm, thickness: 1mm, the upper and lower surfaces of the sample are parallel, and mark the rolling direction of the sample when cutting;

[0045] (3) Grind and polish the surface of the sample; use mechanical polishing, use 240 mesh, 400 mesh, 800 mesh, and 1000 mesh sandpaper in sequence, and adjust the sample at 90 degrees after each process of mechanical polishing is completed, so as not to observe The grinding marks of the previous process are used as the conditions for polishing; the polishing is mechanical polishing, using 1.5μm diamo...

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Abstract

The invention discloses a high-nitrogen stainless steel EBSD test sample surface treatment method. A special erosion agent is used for carrying out surface corrosion on high-nitrogen stainless steel at low temperature, so that the effect of removing residual stress on the surface of the high-nitrogen stainless steel is achieved; an erosion solution is simple to prepare, and the surface erosion effect of the erosion solution on the high-nitrogen stainless steel is uniform, so that a very smooth sample surface can be obtained, and an EBSD test can be directly carried out on the sample; comparedwith a traditional electrolytic polishing or an ion polishing method, the high-nitrogen stainless steel EBSD test sample surface treatment method is simpler, and the whole process is controllable; andin a EBSD test process, an analysis rate of the sample is high, the surface quality required by the electrolytic polishing or the ion polishing can be completely achieved, and a satisfactory EBSD observation effect is achieved.

Description

technical field [0001] The invention belongs to the field of detection and analysis of metal materials, and in particular relates to a surface treatment method for an EBSD test sample of high-nitrogen stainless steel. Background technique [0002] High-nitrogen stainless steel can greatly improve the corrosion resistance and mechanical properties of steel by adding nitrogen to stainless steel. Stable austenitic stainless steel has very important application value in industrial, military, low temperature and other fields. [0003] The metallographic corrosion agent of high nitrogen stainless steel has been studied, and the patent No. 201410656446.X involves a mixed solution of hydrochloric acid, acetic acid, nitric acid, and glycerin. During the EBSD test, the etchant only corrodes the grain boundaries of the high-nitrogen stainless steel, and cannot effectively remove the surface residual stress introduced during the sample preparation process, resulting in low resolution du...

Claims

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Application Information

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IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 薛峰安治国白丽娟邢承亮谷秀锐刘艳丽
Owner HEBEI IRON AND STEEL
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