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Gold phase corrosive and gold phase displaying method for displaying crack microscopic structure

A display method and microstructure technology, applied in the display of crack microstructure after tempering, metallographic corrosion agent and metallographic display of crack microstructure, in the field of quenching of steel materials, can solve the adverse effects of cracks, Problems such as small color contrast and difficult to accurately distinguish the surrounding tissue of the crack

Active Publication Date: 2017-10-10
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the metallographic display method of iron and steel materials is to use 3%-4% nitric acid alcohol solution as the etchant, rinse with water and dry after corrosion, and then observe under the metallographic microscope, but for the microstructure of martensite, bainite, etc. For iron and steel materials of sorbite and sorbite, since the contrast of each structure is similar and the color contrast is small, it is difficult to accurately distinguish the structure around the crack, which will have an adverse effect on judging the cause of the crack

Method used

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  • Gold phase corrosive and gold phase displaying method for displaying crack microscopic structure
  • Gold phase corrosive and gold phase displaying method for displaying crack microscopic structure

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Select 18CrNiMo7-6 crack microstructure observation.

[0022] (1) Preparation of corrosive agent: put a beaker containing 100ml of distilled water into a water bath with a temperature of 55°C, and after ensuring that the water temperature reaches 55°C, weigh 5g of picric acid (commercially available, purity ≥ 99.8%) and put it into the beaker And stir evenly, then weigh 5g sodium dodecylbenzenesulfonate and put it into the prepared picric acid aqueous solution, and drop into the FeCl of 4ml nitric acid and 0.2ml in the solution 3 solution, stirring constantly to mix evenly during the addition process.

[0023] (2) Chemical attack: Take 30ml of the prepared corrosive agent and put it in a water bath at 55°C. After constant temperature, put the sample in a petri dish with the polished side facing up. Wipe the surface of the sample for 2min-3min, and when the surface of the sample turns dark gray, gently wipe the surface with a new absorbent cotton soaked in alcohol to re...

Embodiment 2

[0027] Select 40Cr crack microstructure observation

[0028] The configuration of the etchant and the etching process are the same as those described in Example 1, the only difference being that the sample uses 40Cr. figure 2 It is a photo of the crack microstructure of 40Cr. It can be clearly shown that the crack traverses the martensitic band.

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Abstract

The invention discloses a gold phase corrosive and a gold phase displaying method for displaying a crack microscopic structure. The gold phase corrosive is prepared from the following components: 5 to 6 percent by mass of bitter acid, 0.1 to 0.3 percent by volume of ferric chloride solution, 4 to 5 percent by mass of an anionic surfactant and 2 to 4 percent by volume of nitric acid. The gold phase corrosive disclosed by the invention is suitable for observing cracks in steel and iron materials, and the microscopic structures of the steel and iron materials are martensite, bainite and sorbite. By adopting the gold phase displaying method disclosed by the invention, the microscopic structure around the cracks can be obviously distinguished, and the judgment on crack defect reasons can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallographic detection, and in particular relates to a metallographic corrosion agent and a metallographic display method for displaying crack microstructures, which are suitable for displaying crack microstructures of iron and steel materials after quenching and tempering. Background technique [0002] Cracks often occur in iron and steel materials due to improper process parameters during heat treatment and pressure processing. In order to analyze the cause of the crack, it is necessary to conduct metallographic observation of the structure near or around the crack to determine the cause of the crack. Usually the metallographic display method of iron and steel materials is to use 3%-4% nitric acid alcohol solution as the etchant, rinse with water and dry after corrosion, and then observe under the metallographic microscope, but for the microstructure of martensite, bainite, etc. For iron and steel ma...

Claims

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Application Information

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IPC IPC(8): C23F1/16G01N1/32
Inventor 王德宝张峰宋祖峰牟祖茂
Owner MAANSHAN IRON & STEEL CO LTD
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