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Preparation method of nickel steel-containing sample for EBSD analysis

A sample, nickel steel technology, applied in the field of electron microscope sample preparation, can solve the problems of unsatisfactory EBSD samples, long sample preparation time, etc., to achieve the reduction of special sample preparation links, high operability, and reduced sample preparation costs Effect

Inactive Publication Date: 2016-09-07
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For iron and steel materials, mechanical polishing or electrolysis is usually used. The traditional mechanical polishing method often takes a long time for sample preparation, and the electrolysis method does not produce EBSD samples due to the selection of electrolyte and the complicated electrolysis process. ideal

Method used

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  • Preparation method of nickel steel-containing sample for EBSD analysis
  • Preparation method of nickel steel-containing sample for EBSD analysis
  • Preparation method of nickel steel-containing sample for EBSD analysis

Examples

Experimental program
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Effect test

preparation example Construction

[0020] The preparation method of the sample for EBSD analysis of this nickel-containing steel adopts the following method steps to prepare:

[0021] (1) Rough machining process: the Ni content in the nickel-containing steel is 8.5wt% to 9.5wt%. It is a low-carbon quenched and tempered steel. The structure is martensite plus bainite. Toughness and strength are the main materials used to manufacture liquefied natural gas storage tanks and transport ships.

[0022] Prepare the sample according to the requirements of metallographic sample preparation, process the sample into a suitable size, and polish it with 240#, 400#, 800# and 1000# water sandpaper in sequence. The next sandpaper can be replaced; after replacing the sandpaper, the sample needs to be rotated 90 degrees; finally a rough sample is obtained. This process does not introduce new sample preparation requirements, the main purpose is to make the sample preparation simple and effective, and the final test of the sample...

Embodiment 1

[0030] Embodiment 1: The specific process of the preparation method of the sample for EBSD analysis of the nickel-containing steel is as follows.

[0031] (1) Rough processing: Prepare the sample according to the requirements of metallographic sample preparation, and then polish it with 240#, 400#, 800# and 1000# water sandpaper.

[0032] (2) Polishing erosion: 2.5 micron particle size diamond suspension is used, the polishing disc speed is 400r / min, and the polishing time is 5min; the etching agent is 4% nitric acid alcohol solution, and the erosion time is 40 seconds.

[0033] (3) Fine polishing: 1 micron diamond suspension is used for polishing, and the rotational speed of the polishing disc is 100r / min. Use 0.05 micron alumina suspension to polish again, the polishing speed is 70r / min, and the polishing time is 20 minutes.

[0034] (4) Clean the surface: Throw the treated sample dry, clean the surface with alcohol, and dry it with a hair dryer to obtain the sample for EBS...

Embodiment 2

[0036] Embodiment 2: The specific process of the preparation method of the sample for EBSD analysis of the nickel-containing steel is as follows.

[0037] (1) Rough processing: Prepare the sample according to the requirements of metallographic sample preparation, and then polish it with 240#, 400#, 800# and 1000# water sandpaper.

[0038] (2) Polishing erosion: use diamond suspension with a particle size of 5 microns, the rotational speed of the polishing disc is 600r / min, and the polishing time is 3 minutes; the etching agent is 4% nitric acid alcohol solution, and the erosion time is 30 seconds.

[0039] (3) Fine polishing: 1.5 micron diamond suspension is used for polishing, and the rotational speed of the polishing disc is 80r / min. Use 0.05 micron aluminum oxide suspension to polish again, the polishing speed is 80r / min, and the polishing time is 15 minutes.

[0040] (4) Clean the surface: Throw the treated sample dry, clean the surface with alcohol, and dry it with a hai...

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Abstract

The invention discloses a preparation method of a nickel steel-containing sample for an EBSD analysis. The method comprises the following steps: rough machining of the nickel steel-containing sample, fine polishing after polishing and erosion, surface cleaning after fine polishing of the sample, and the sample for the EBSD analysis is obtained; the fine polishing process comprises the following steps: diamond suspension liquid is used for polishing the sample after polishing and erosion, and aluminum oxide suspension liquid is used for polishing the sample. Special sample preparation links are reduced for facilitating implementation; the fine polishing process can relieve stress; compared with the conventional polishing method, the method has the advantages of simplicity, saved time, reduced sample preparation cost, and improved sample preparation efficiency, and the sample has a high desorption rate which can meet the requirements of EBSD analysis. The method has high operability, so that sample preparation is simple and timesaving, and preparation efficiency of the sample is improved. The sample for the EBSD analysis has a high desorption rate and good stability, the calibrate rate of the sample reaches 90% or above, general demands are satisfied, and the effects are good.

Description

technical field [0001] The invention relates to a method for preparing an electron microscope sample, in particular to a method for preparing a sample for EBSD analysis of nickel-containing steel. Background technique [0002] Electron backscatter diffraction (EBSD) technology is based on the analysis of the diffraction Kikuchi bands formed by electron beam excitation on the inclined sample surface in the scanning electron microscope. The collected data can draw orientation imaging map OIM, pole figure and inverse pole figure, and can also Orientation (difference) distribution function. EBSD technology can obtain a large amount of crystallographic information about the sample in a short period of time, such as: texture and misorientation analysis; grain size and shape distribution analysis; grain boundary, subgrain and twin boundary property analysis; strain and recrystallization analysis; phase identification and comparison calculation, etc. EBSD's research on many materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 薛峰海岩安治国崔会杰刘艳丽
Owner HEBEI IRON AND STEEL
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