Chemical erosion agent for displaying macrostructure of expansion alloy, and erosion method thereof

A chemical etchant and expansion alloy technology, applied in the preparation of test samples, etc., can solve the problems of the difficulty of macroscopic low-magnification structure of expansion alloys, and achieve the effect of optimizing continuous casting technology, improving solidification structure, and being easy to control.

Inactive Publication Date: 2016-04-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, due to the above problems in the existing low-magnification macrostructure erosion methods of expanded

Method used

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  • Chemical erosion agent for displaying macrostructure of expansion alloy, and erosion method thereof
  • Chemical erosion agent for displaying macrostructure of expansion alloy, and erosion method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition of Fe-36Ni low expansion alloy is shown in Table 1. Grind the alloy ingot on 60#, 200#, 400#, 800#, 1500# water sandpaper in turn until it is bright, the grinding marks are uniform and in the same direction, then rinse the surface with alcohol, and finally dry it with a hair dryer to prepare for erosion. Add 4g of analytically pure picric acid sealed in water into a beaker filled with 100ml of absolute ethanol, stir evenly, then add 2g of sodium dodecylbenzenesulfonate, and finally drop in 2ml of hydrochloric acid, and heat the prepared The etchant is heated to a boil and kept at a constant temperature. Use the sample holder to fix the ground sample so that the smooth side is facing down, and suspend it in the boiling hot etching solution for 3-5 minutes; after the etching, wipe the eroded surface with a cotton ball dipped in alcohol. Then rinse with water and blow dry.

[0025] Clear macroscopic low-magnification tissues can be seen with the ...

Embodiment 2

[0029] The chemical composition of Fe-43Ni low expansion alloy is shown in Table 2. Grind the alloy ingot on 60#, 200#, 400#, 800#, 1500# water sandpaper in turn until it is bright, the wear marks are uniform and in the same direction, then rinse the surface with alcohol, and finally dry it with a hair dryer to prepare for erosion. Add 4g of analytically pure picric acid sealed in water into a beaker filled with 100ml of absolute ethanol, stir evenly, then add 2g of sodium dodecylbenzenesulfonate, and finally drop in 2ml of hydrochloric acid, and heat the prepared The etchant is heated to a boil and kept at a constant temperature. Use the sample clamp to fix the ground sample, with the smooth side facing down, and suspend it in the boiling hot etching solution for 3 to 5 minutes; after the etching, wipe the eroded surface with a cotton ball dipped in alcohol. Then rinse with water and blow dry. Clear macroscopic low-magnification tissue visible to the naked eye, such as fi...

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PUM

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Abstract

The invention relates to a chemical erosion agent for displaying the macrostructure of expansion alloy, and an erosion method thereof, and belongs to the technical field of metallographic examination analysis. The chemical erosion agent comprises 3-4g of picric acid, 90-100ml of anhydrous alcohol, 2-3ml of hydrochloric acid and 2g of sodium dodecylbenzene sulfonate. The erosion method of the erosion agent comprises the following steps: heating the prepared erosion agent to a boiling state, allowing the polished surface of a ground sample to be downward, and suspending the ground sample in the boiling erosion liquid for 3-5min; and cleaning the eroded surface with alcohol after the erosion, and flushing the cleaned sample with clear water. The chemical erosion agent has the characteristics of simple operation process, good erosion effect, and easy control of the erosion time, and can be used to rapidly and accurately observe the microstructure of the expansion in order to provide technical bases for optimizing a continuous casting technology and improve the solidification structure of a continuous cast blank.

Description

technical field [0001] The invention belongs to the technical field of metallographic inspection and analysis, and in particular relates to a chemical etchant for displaying the macroscopic low-magnification structure of an expanded alloy and an erosion method thereof. Background technique [0002] The expansion alloy is a single-phase austenite structure, and there is no phase transformation during the solidification process, resulting in a coarse solidification structure of the alloy continuous casting slab, almost all of which are coarse columnar grains, which seriously deteriorates the thermoplasticity of the alloy, causing the continuous casting slab to The cracking phenomenon is serious during the rolling process. Refining the solidification structure of the slab, inhibiting the growth of columnar grains in the slab and increasing the ratio of equiaxed grains in the center of the slab is an effective method to improve the thermoplasticity of the alloy. In order to imp...

Claims

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Application Information

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IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 于彦冲张金玲王社斌
Owner TAIYUAN UNIV OF TECH
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