Preparation method of Cr-Mo steel EBSD sample

A sample and surface measurement technology, which is applied in the field of Cr-Mo steel EBSD sample preparation, can solve the problems of low success rate, difficulty in sample preparation process, complicated sample preparation process, etc., and achieve the effect of low sample preparation cost

Inactive Publication Date: 2016-01-13
HEBEI IRON AND STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the backscattered electrons only occur in the depth range of tens of nanometers on the surface of the sample, and the EBSD technology needs to deflect the observation surface of the sample by 70°, and the electron beam is excited on the observation surface and forms a diffraction Kikuchi band for analysis. The requirements on the observation surface of the sample are relatively high, and the sample preparation process is difficult. At present, most EBSD samples are prepared by mechanical polishing + electrolytic polishing, and electrolytic polishing needs to obtain suitable polishing liquid and electrolytic process parameters. A large number of tests and procedures are required. Exploring, the sample preparation process is complicated and the success rate is low

Method used

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  • Preparation method of Cr-Mo steel EBSD sample
  • Preparation method of Cr-Mo steel EBSD sample
  • Preparation method of Cr-Mo steel EBSD sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of preparation method of Cr-Mo steel EBSD sample provided by the invention comprises the following steps:

[0030] (1) Wire cutting: Use a wire cutting machine to process Cr-Mo steel samples with a size of 8mm*10mm*10mm, and use 280# sandpaper to smooth one side of the samples.

[0031] (2) Coarse grinding: Grind the sample by hand, and polish the sample with 280#, 400#, 800#, 1000#, 1500# silicon carbide water sandpaper in sequence, and use different numbers of sandpaper for rough grinding time each time The time is 6 minutes, and the sample should be rotated 90 degrees in the same direction every time the sandpaper is changed during grinding.

[0032] (3) Mechanical polishing: use an automatic polishing machine for polishing, use diamond polishing fluids of different particle sizes to polish, sequentially polish with 9μm, 3μm, and 1μm particle size polishing solutions for 20 minutes, and finally use 50nm particle size Al2O3 polishing solution for 40 minutes, D...

Embodiment 2

[0038] A kind of preparation method of Cr-Mo steel EBSD sample provided by the invention comprises the following steps:

[0039] (1) Wire cutting: Use a wire cutting machine to process Cr-Mo steel samples with a size of 12mm*10mm*10mm, and use 280# sandpaper to smooth one side of the samples.

[0040] (2) Coarse grinding: Grind the sample by hand, and polish the sample with 280#, 400#, 800#, 1000#, 1500# silicon carbide water sandpaper in sequence, and use different numbers of sandpaper for rough grinding time each time For 4 minutes, the sample should be rotated 90 degrees in the same direction every time the sandpaper is changed during grinding.

[0041] (3) Mechanical polishing: use an automatic polishing machine for polishing, use diamond polishing fluids of different particle sizes to polish, sequentially polish with 9μm, 3μm, and 1μm polishing solutions for 15 minutes, and finally use 50nm particle size Al2O3 polishing solution for 30 minutes, During the polishing proce...

Embodiment 3

[0047] A kind of preparation method of Cr-Mo steel EBSD sample provided by the invention comprises the following steps:

[0048] (1) Wire cutting: Use a wire cutting machine to process Cr-Mo steel samples with a size of 10mm*10mm*10mm, and use 280# sandpaper to smooth one side of the samples.

[0049](2) Coarse grinding: Grind the sample by hand, and polish the sample with 280#, 400#, 800#, 1000#, 1500# silicon carbide water sandpaper in sequence, and use different numbers of sandpaper for rough grinding time each time The time is 2 minutes, and the sample should be rotated 90 degrees in the same direction every time the sandpaper is changed during grinding.

[0050] (3) Mechanical polishing: Polishing uses an automatic polishing machine, polishing with diamond polishing fluids of different particle sizes, polishing with 9μm, 3μm, and 1μm particle size polishing solutions for 18 minutes, and finally using 50nm particle size Al2O3 polishing solution for 35 minutes, During the ...

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Abstract

The invention relates to a preparation method of Cr-Mo steel EBSD samples, which particularly includes the following steps: (a) grinding one surface of a Cr-Mo steel EBSD sample by abrasive paper and grinding a to-be-test surface through silicon carbide waterproof abrasive papers being 280#, 400#, 800#, 1000# and 1500# in meshes; (b) polishing the to-be-test surface with diamond polishing fluids and aluminum oxide polishing fluids in different granularities; (c) reducing the thickness of the mechanically-polished sample to 3 mm through a wire cutting machine; (d) cleaning the sample to remove oil dirt from the sample; (e) continuously polishing the to-be-test surface of the sample with a polishing fluid being 50 nm in granularity for 1-4 min; and (f) cleaning the polished sample in anhydrous ethanol and air-drying the sample to obtain the sample for EBSD analysis. The preparation method is simple, wherein the sample just needs to mechanically polish without any special electrolytic polishing device, so that the method is low in sample making cost and the sample satisfies the requirement in the EBSD analysis.

Description

technical field [0001] The invention belongs to the technical field of electron microscope sample preparation, in particular to a method for preparing a Cr-Mo steel EBSD sample. Background technique [0002] Cr-Mo low-alloy steel is a heat-strength steel and hydrogen-resistant steel commonly used in countries all over the world. It is widely used in the manufacture of large-scale equipment such as thermal power equipment, nuclear power equipment, and petroleum, chemical, and coal conversion equipment that are in contact with hydrogen. Since the working environment of the steel is high temperature, high pressure, contact with hydrogen, and the service conditions are very harsh, the steel is required to have high strength, good plasticity and toughness, excellent welding performance and temper embrittlement resistance. The comprehensive performance of Cr-Mo steel depends on its microstructure state, and the microstructure analysis of the structure is very important. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32
Inventor 赵燕青李建新吝章国刘宏强吴艳阳崔会杰薛峰安治国熊自柳
Owner HEBEI IRON AND STEEL
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