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Method for rapidly displaying titaniferous inclusions in field condition based on corrosion principle

A technology for field conditions and inclusions, applied in the preparation of test samples, measurement devices, and material analysis by optical means, etc., can solve the problems of resolution and magnification limit, difficult polishing process, and complicated operation, and achieve display Good effect, improved sample preparation efficiency and strong versatility

Inactive Publication Date: 2012-09-19
NORTHEAST POWER SCI RES INSTITUTION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to prepare samples is cumbersome, especially the final polishing process is very difficult, and it is almost impossible to complete in a non-laboratory environment such as a power plant
In addition, since the on-site metallographic microscope has only a single bright field function, and the resolution and magnification are limited, it is difficult to effectively distinguish such inclusions in the case of purely polishing the metallographic sample.

Method used

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  • Method for rapidly displaying titaniferous inclusions in field condition based on corrosion principle
  • Method for rapidly displaying titaniferous inclusions in field condition based on corrosion principle
  • Method for rapidly displaying titaniferous inclusions in field condition based on corrosion principle

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Embodiment 1

[0019] The present invention is a method for quickly displaying titanium-containing inclusions under field conditions based on the principle of erosion, comprising the following steps:

[0020] (1) Prepare metallographic samples and finely grind them to 2000# sandpaper;

[0021] (2) Use special chemical reagents to erode the surface of the ground sample, which can achieve the effect of polishing and displaying the morphology of titanium-containing inclusions at the same time;

[0022] (3) Use an on-site metallographic microscope to observe or use film coating technology to sample and analyze.

[0023] Fine grinding of the present invention is to use 120#, 240# to carry out coarse grinding successively, and then use 400#, 600#, 1000#, 1500# and 2000# sandpaper to carry out fine grinding.

[0024] The special chemical reagent of the present invention comprises: hydrogen peroxide, hydrofluoric acid, oxalic acid.

Embodiment 2

[0026] 1. Conduct metallographic sample preparation on the surface of the bolt waist to be inspected, use 120#, 240# for rough grinding, and then use 400#, 600#, 1000#, 1500# and 2000# sandpaper for fine grinding;

[0027] 2. Use the special chemical reagent hydrogen peroxide to erode the surface of the ground sample, which can achieve the effect of polishing and displaying inclusions at the same time;

[0028] 3. A portable metallographic microscope can be used for observation on site.

Embodiment 3

[0030] 1. Conduct metallographic sample preparation on the surface of the bolt waist to be inspected, use 120#, 240# for rough grinding, and then use 400#, 600#, 1000#, 1500# and 2000# sandpaper for fine grinding;

[0031] 2. Use special chemical reagent hydrofluoric acid to erode the surface of the ground sample, which can achieve the effect of polishing and displaying inclusions at the same time;

[0032] 3. Sampling and analysis can be carried out on site using film coating technology.

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Abstract

The invention belongs to the technical field of a method for rapidly displaying titaniferous inclusions in the field condition based on a corrosion principle, in particular relates to the technical field of metallographic sample preparation of the field metallographic displaying method of titanium nitride and titanium sulfide inclusions in steels, and the like. The method includes the steps of preparing metallographic samples and grinding the samples with 2000 # abrasive paper; corroding surfaces of the ground samples with special chemical reagent, wherein effects of polishing and appearance displaying of titaniferous inclusions can be achieved simultaneously; and performing observation with a field metallographic microscope or sampling analysis by using the membrane coating technology. According to the method, shapes of the titanium nitride and titanium sulfide inclusions can be highlighted, thus, matrix should be prevented from presenting metallographic structures to confuse the field of view, further, field metallographic sample preparation difficulties can be simplified, and sample preparation efficiency can be improved. Besides, titaniferous inclusions in steels can be displayed accurately and efficiently, and the method has the advantages that sample preparation is convenient, displaying effect is good, generality is high and the like.

Description

technical field [0001] The invention belongs to the technical field of a method for quickly displaying titanium-containing inclusions under field conditions based on the principle of erosion, especially relates to the technical field of metallographic sample preparation such as on-site metallographic display methods for TiN and TiS inclusions in steel, and is suitable for thermal power generation A convenient on-site metallographic display method for TiN and TiS inclusions in 20Cr1Mo1VTiB and 20Cr1Mo1VNbTiB steels for steam turbine bolts. Background technique [0002] 20Cr1Mo1VTiB and 20Cr1Mo1VNbTiB are bainitic heat-resistant steels, which are commonly used in high-temperature bolts for steam turbines in thermal power plants, and need to withstand long-term tensile and fatigue loads in high-temperature environments. This requires the material to have high high-temperature durability and fatigue resistance. DL / T-439-2006 "Technical Guidelines for High-temperature Fasteners ...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N21/84
Inventor 徐昀李宏强
Owner NORTHEAST POWER SCI RES INSTITUTION
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