Grinding and polishing erosion reagent for pearlite, and rapid metallographic examination method for pearlitic steel

A pearlitic steel and metallographic inspection technology, which is applied in the preparation of test samples, material analysis through optical means, and instruments, can solve the problems of difficult on-site operation, poor working conditions of metallographic inspection, and high risk. Achieve the effects of simple operation, high inspection efficiency and time saving

Inactive Publication Date: 2016-09-07
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with indoor sampling analysis and inspection, the working conditions of on-site metallographic inspection are poor, the risk is high, and the metallographic structure is not easy to photograph
The traditional on-site metallographic preparation process of pearlitic steel needs to go through repeated mechanical polishing, mechanical polishing and other steps. The preparation time of metallographic samples is long and the on-site operation is not easy. The preparation of a metallographic inspection point often takes 40-60 minutes, and It is easy to form an interference layer or a deformation layer on the metallographic surface, thereby affecting the metallographic observation and analysis results, and the effect of on-site sample preparation is not ideal

Method used

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  • Grinding and polishing erosion reagent for pearlite, and rapid metallographic examination method for pearlitic steel
  • Grinding and polishing erosion reagent for pearlite, and rapid metallographic examination method for pearlitic steel
  • Grinding and polishing erosion reagent for pearlite, and rapid metallographic examination method for pearlitic steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The pearlite grinding, polishing and erosion reagent of the present invention is prepared from 25 parts by mass of distilled water, 47.12 parts of hydrogen peroxide solution, 2.28 parts of hydrofluoric acid solution and 2.8 parts of oxalic acid.

[0027] The mass percent concentration of hydrogen peroxide in the hydrogen peroxide solution is 30%.

[0028] The mass percent concentration of hydrofluoric acid in the hydrofluoric acid solution is 40%.

Embodiment 2

[0030] The pearlite grinding, polishing and erosion reagent of the present invention is prepared from 30 parts by mass of distilled water, 33.66 parts of hydrogen peroxide solution, 3.19 parts of hydrofluoric acid solution and 2 parts of oxalic acid.

[0031] The mass percent concentration of hydrogen peroxide in the hydrogen peroxide solution is 30%.

[0032] The mass percent concentration of hydrofluoric acid in the hydrofluoric acid solution is 40%.

Embodiment 3

[0034] The pearlite grinding and polishing erosion reagent of the present invention is prepared from 26 parts by mass of distilled water, 38 parts of hydrogen peroxide solution, 2.5 parts of hydrofluoric acid solution and 2.3 parts of oxalic acid.

[0035] The mass percent concentration of hydrogen peroxide in the hydrogen peroxide solution is 30%.

[0036] The mass percent concentration of hydrofluoric acid in the hydrofluoric acid solution is 40%.

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Abstract

The invention discloses a grinding and polishing erosion reagent for pearlite, and a rapid metallographic examination method for pearlitic steel. The grinding and polishing erosion reagent is prepared from, by mass, 25 to 30 parts of distilled water, 33.66 to 47.12 parts of a hydrogen peroxide solution, 2.28 to 3.19 parts of a hydrofluoric acid solution and 2 to 2.8 parts of oxalic acid. The reagent can carry out rapid grinding and polishing erosion on a metallographic to-be-examined surface of the pearlitic steel; and the method can rapidly and accurately accomplish metallographic examination of the pearlitic steel.

Description

technical field [0001] The invention belongs to the field of metallographic detection, and relates to a pearlite grinding and polishing erosion reagent and a rapid metallographic detection method for pearlite steel. Background technique [0002] Pearlitic heat-resistant steel is a low-alloy heat-resistant steel whose matrix is ​​pearlite or bainite. Generally, the total amount of alloying elements is ≤5%. In addition to pearlite, the structure also includes bainite steel. It is characterized by good Thermal conductivity, and small expansion coefficient. Pearlitic steel is widely used in the manufacture of various heat-resistant structural materials in the range of 450 ° C ~ 620 ° C, mainly used as boiler water walls, superheaters, reheaters, economizers, etc., with high creep limit, durable strength and Plasticity, good oxidation resistance and corrosion resistance parts, is one of the most common materials in on-site metallographic inspection of thermal power plant systems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N21/84
CPCG01N1/32G01N21/84
Inventor 田晓璇
Owner XIAN THERMAL POWER RES INST CO LTD
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