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Retained austenite contained dual phase steel color metallography coloring agent and coloring display method

A technology of residual austenite and color metallography, which is applied in the direction of color/spectral characteristic measurement, measuring device, material analysis through optical means, etc. Organizations cannot accurately distinguish and identify problems, to achieve the effect of improving accurate analysis, easy identification, and clear outline

Inactive Publication Date: 2014-12-24
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that additional heat (etching) treatment is required
[0009] The above methods cannot accurately distinguish and identify some microstructures, and are even prone to misjudgment, which affects the accurate analysis of scientific research and the development of new products.

Method used

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  • Retained austenite contained dual phase steel color metallography coloring agent and coloring display method
  • Retained austenite contained dual phase steel color metallography coloring agent and coloring display method
  • Retained austenite contained dual phase steel color metallography coloring agent and coloring display method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) sodium metabisulfite and water are mixed with the aqueous solution A that is 1% concentration by mass percent;

[0044] (2) Picric acid and alcohol are configured into alcohol solution B with a mass percentage of 4% concentration;

[0045] (3) Prepare the etching solution: take 25ml of 1% aqueous solution A and 4% alcohol solution B respectively, mix them according to the volume ratio of 1:1, and add 0.2ml of concentrated hydrochloric acid with a concentration of 38%. well mixed.

[0046] (4) Put the metallographic sample 3# (annealing temperature Ta=800°C) of dual-phase steel with a length of 20mm×width 15mm×thickness 1.5mm into the above-mentioned etching solution, the immersion time is 3s, and the immersion depth is 8- 15mm, take out the sample after the surface turns light blue, and control the etching temperature at 20-30°C. Rinse the etched sample with a large amount of water first, then sprinkle it with alcohol, and after fully removing the water, use electr...

Embodiment 2

[0050] (1) sodium metabisulfite and water are mixed with the aqueous solution A that is 10% concentration by mass percent;

[0051] (2) Picric acid and alcohol are configured into alcohol solution B with a mass percentage of 4% concentration;

[0052] (3) Prepare the etching solution: Take 25ml of 10% aqueous solution A and 4% alcohol solution B, mix them according to the volume ratio of 1:1, and add 1ml of concentrated hydrochloric acid with a concentration of 38%, mix uniform.

[0053] (4) Put metallographic sample 3# (annealing temperature Ta=800°C) of duplex steel with length 20mm×width 15mm×thickness 1.5mm into the above-mentioned etching solution, immersion time is 10s, immersion depth is 8- 15mm, take out the sample after the surface turns light blue, and control the etching temperature at 20-30°C. Rinse the etched sample with a large amount of water first, then sprinkle it with alcohol, and after fully removing the water, use electricity to Blow dry with cool air;

...

Embodiment 3

[0057] (1) sodium metabisulfite and water are mixed with the aqueous solution A that is 1% concentration by mass percent;

[0058] (2) Picric acid and alcohol are configured into alcohol solution B with a mass percentage of 4% concentration;

[0059] (3) Prepare the etching solution: take 25ml of 1% aqueous solution A and 4% alcohol solution B respectively, mix them according to the volume ratio of 1:1, and add 0.2ml of concentrated hydrochloric acid with a concentration of 38%. well mixed.

[0060] (4) Put metallographic sample 5# (annealing temperature Ta=840°C) of dual-phase steel with a length of 20mm×width 15mm×thickness 1.5mm into the above-mentioned etching solution, the immersion time is 3s, and the immersion depth is 8- 15mm, take out the sample after the surface turns light blue, and control the etching temperature at 20-30°C. Rinse the etched sample with a large amount of water first, then sprinkle it with alcohol, and after fully removing the water, use electricit...

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Abstract

The invention discloses a retained austenite contained dual phase steel color metallography coloring agent and a coloring display method and belongs to the technical field of steel and iron material microscopic structure metallographic dyeing. The coloring display method comprises the following steps of configuring sodium metabisulfite and water into an aqueous solution A with the concentration, by mass percent, being from 1 to 10% and configuring picric acid and ethyl alcohol into a solution B with the concentration, by mass percent, being from 2 to 4%; mixing the above aqueous solution A and B according to a volume ratio of 1:1, meanwhile adding 0.2 to 1ml concentrated hydrochloric acid with the concentration being from 37 to 38% and uniformly stirring after being fully mixed; arranging a dual phase steel sample into the above configured etching liquid, wherein the etching temperature is from 20 to 30 DEG C and the etching time is form 3 to 10s; washing through a large amount of fresh water, sprinkling through the ethyl alcohol and drying after moisture removal; observing under a metallographic microscope; measuring phase volume fractions. The coloring display method has the advantages of enabling ferrite, martensite, retained austenite and bainite tissues to be displayed in different colors, being clear in outline, distinct in gradation and easy to identify; being simple, reliable and rapid in process and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of color metallographic dyeing of the microstructure of steel materials, in particular to a color metallographic dye and a color display method for dual-phase steel containing residual austenite, residual austenite or island martensite in advanced high-strength steel- Display and quantitative detection of austenite (referred to as M / A island). technical background [0002] As a typical representative of the first generation of advanced high-strength steel AHSS, dual phase steel (Dual Phase steel) has the advantages of high strength, good elongation and formability, strong absorption of collision energy, etc. 15GPa%). At the same time, it can save resources, reduce weight and reduce consumption. At present, it has become the most widely used high-strength steel material in the lightweight trend of the body and the most mature technology. Usually, the metallographic structure after nitric acid alcohol corrosi...

Claims

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Application Information

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IPC IPC(8): G01N1/30G01N21/84G01N21/25
Inventor 王卫卫李光瀛胡霄雨于桂玲张江玲
Owner CENT IRON & STEEL RES INST
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