Image Acquisition Method of Nano Precipitates Based on Scanning Electron Microscope Backscattering Mode

A scanning electron microscope, image acquisition technology, applied in the field of iron and steel metallurgy, can solve problems such as difficult observation

Active Publication Date: 2021-05-04
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

[0005] In view of this, the present invention provides a nano-precipitate image acquisition method based on the scanning electron microscope backscattering mode, which overcomes the difficulty of observing the nanoscale structure of the metallographic sample under the high magnification of the scanning electron microscope. Thickness method to achieve the purpose of improving the conductivity and reducing the influence of the magnetic field, and provide a new sample preparation method, coupled with the corresponding scanning electron microscope parameters, so as to improve the observation quality of nano-scale organization under the scanning electron microscope

Method used

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  • Image Acquisition Method of Nano Precipitates Based on Scanning Electron Microscope Backscattering Mode
  • Image Acquisition Method of Nano Precipitates Based on Scanning Electron Microscope Backscattering Mode
  • Image Acquisition Method of Nano Precipitates Based on Scanning Electron Microscope Backscattering Mode

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Embodiment 1

[0044] Preprocess Q460 steel into 300μm-thick sheets by wire electric discharge cutting, and use 400#, 800#, 1200#, 1500#, 2000# silicon carbide metallographic sandpaper to polish and thin it to 80μm; use a punching machine to punch it into a diameter It is a small disc of 3mm, and ground until both sides are flat; use an alcohol solution with a volume fraction of 5% perchloric acid and 2.5% glycerin at -25°C, 20V constant voltage electrolytic double-jet thinning for 60s; the sample after double-spraying Wash in absolute ethanol for 3 times, corrode with 4% nitric acid alcohol at -20°C, and then use absolute ethanol to clean, and finally dry the surface of the sample with absolute ethanol with an ear washing ball, and examine it under a scanning electron microscope. Observe the morphology of nano-scale carbides, where the scanning electron microscope acceleration voltage is 9kV, and the working distance is 8mm, such as figure 1 shown.

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Abstract

The invention provides a nano-precipitate image acquisition method based on scanning electron microscope backscattering mode. The method includes the following steps: sample pretreatment, electrolytic double-spray thinning, low-temperature erosion, and scanning electron microscope shooting to obtain the nano-precipitate morphology image. The invention achieves the purpose of improving the electrical conductivity of the sample and reducing the influence of magnetism by reducing the thickness of the sample, thereby improving the imaging quality of the nano-precipitate image in the steel material under the scanning electron microscope. Compared with the traditional sample preparation and shooting methods, it can obtain more Higher magnification and clearer images have certain significance for the observation of precipitate morphology and the statistics of size and distribution.

Description

【Technical field】 [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for acquiring images of nano-precipitates based on scanning electron microscope backscattering mode. 【Background technique】 [0002] The phase in the material that is distributed in the matrix phase in a discontinuous state and in which it is impossible to surround other phases is called the precipitated phase. When the fine and dispersed precipitates are evenly distributed in the matrix phase, it will have a significant strengthening effect, and the number, size and distribution of the precipitates will affect its mechanical properties. Therefore, the statistical analysis of the precipitates in metal materials It has certain research significance. [0003] Metallographic analysis, as one of the important means of experimental research on metal materials, plays a pivotal role in the field of metal materials research. The tools for analyzing the micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/2202G01N23/2251
CPCG01N23/2202G01N23/2251
Inventor 王学敏范佳杰丛菁华徐翔宇李江文黄安然
Owner UNIV OF SCI & TECH BEIJING
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