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A treatment method for metallographic samples with crack defects after etching

A metallographic sample and processing method technology, applied in the field of physical and chemical inspection, can solve the problems of pollution, inability to effectively observe and accurately analyze the microstructure and morphology, and achieve the purpose of avoiding corrosion of the grinding surface, protecting the metallographic grinding surface, show real effect

Active Publication Date: 2022-03-22
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the residual etching solution or the mixture of etching solution and water in the crack gap after the metallographic sample is etched pollutes the metallographic grinding surface of the sample, so that the microstructure and Effectively observe and accurately analyze the morphology, and provide a treatment method for metallographic samples with crack defects after etching

Method used

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  • A treatment method for metallographic samples with crack defects after etching
  • A treatment method for metallographic samples with crack defects after etching
  • A treatment method for metallographic samples with crack defects after etching

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) The SA-210C failure sample with crack defects is ground and polished to obtain a metallographic polished sample with a metallographic grinding surface, and then it is etched with an etchant of nitric acid-alcohol solution, Rinse with clean water after etching, then drip with absolute ethanol and dry with hot air;

[0029] (2) Soak the dried sample in the aqueous solution of EDTA and urotropine for 10 min, wherein the mass concentration of EDTA in the aqueous solution of EDTA and urotropine is 2%, and the mass concentration of urotropine is 0.5% %;

[0030] (3) Take out the soaked sample, drop absolute ethanol on it, blow it with hot air until the surface temperature of the sample is 40°C, and then apply a layer of varnish coating with a thickness of 1mm on the cracked area of ​​the sample at one time; After the coating on the surface of the sample is naturally dried and solidified, it is observed under an optical microscope, and the microstructure of the crack defe...

Embodiment 2

[0032] (1) The failure sample of 12Cr1MoVG with crack defects is ground and polished to obtain a metallographic polished sample with a metallographic grinding surface, and then it is etched with an etchant of nitric acid-alcohol solution to etch it. Afterwards, rinse with clean water, then drop absolute ethanol and dry with hot air;

[0033] (2) soak the dried sample in the aqueous solution of EDTA and urotropine for 20min, wherein the mass concentration of EDTA in the aqueous solution of EDTA and urotropine is 4.5%, and the mass concentration of urotropine is 0.9% %;

[0034](3) Take out the soaked sample, drop absolute ethanol and blow it with hot air until the surface temperature of the sample is 50°C, and then apply a layer of varnish coating with a thickness of 0.8mm on the cracked area of ​​the sample at one time After the coating on the surface of the sample is naturally dried and solidified, it is observed under an optical microscope, and the microstructural morpholog...

Embodiment 3

[0036] (1) The failure sample of HR3C with crack defects is ground and polished to obtain a metallographic polished sample with a metallographic grinding surface, and then it is etched with an etchant of copper chloride-hydrochloric acid aqueous solution, Rinse with clean water after etching, then drop absolute ethanol and dry with hot air;

[0037] (2) soak the dried sample in the aqueous solution of EDTA and urotropine for 30min, wherein the mass concentration of EDTA in the aqueous solution of EDTA and urotropine is 3.2%, and the mass concentration of urotropine is 0.05%; %;

[0038] (3) Take out the soaked sample, drop absolute ethanol on it, blow it with hot air until the surface temperature of the sample is 60°C, and then apply a layer of smooth varnish with a thickness of 1 mm on the cracked area of ​​the sample at one time. After the coating on the surface of the sample is naturally dried and solidified, it is observed under an optical microscope, and the microstructu...

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Abstract

The invention relates to the field of physical and chemical testing, and specifically discloses a method for treating a metallographic sample with crack defects after etching, comprising the following steps: (1) washing the metallographic sample with crack defects with water after etching, and then dripping (2) Soak the dried sample in an aqueous solution of EDTA and urotropine; (3) Take out the soaked sample, drip it with absolute ethanol and blow it with hot air Dry, then apply a layer of varnish; observe under a microscope after the coating dries. The present invention adopts the aqueous solution of EDTA and urotropine to immerse the etched metallographic sample, partially removes the mixture of etching solution and water in the crack gap of the metallographic sample, and then smears the test surface with gloss The oil coating can inhibit the residual aqueous solution in the gap of the crack defect from seeping out, that is, the mixed liquid in the crack will be sealed in the crack, and will not seep out to the inner surface of the varnish and affect the microscopic observation.

Description

technical field [0001] The invention relates to the field of physical and chemical testing, in particular to a method for treating metallographic samples with crack defects after etching. Background technique [0002] When performing failure analysis on failed parts of metals and alloys, it is generally necessary to take metallographic samples from the failed parts, and observe and analyze the microstructure after being etched with an etching solution to provide relevant information on the heat treatment, microstructure and structure of the material. Information about material characteristics such as morphology, cracking characteristics, thermal effects, surface condition, etc. In order to prevent the etchant from causing the observed microstructure and morphology to be untrue, unclear, or false when observing the microstructure, the metallographic sample needs to be rinsed with water after etching to remove the gold. Etching solution on the phase surface. [0003] Metallo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/34G01N1/30G01N1/32
CPCG01N1/28G01N1/34G01N1/30G01N1/32
Inventor 江平董猛曾辉谢逍原杨首恩陈莉君
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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