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Quantitative determination method of martensite in dual phase steel

A quantitative measurement, dual-phase steel technology, applied in the field of detection and analysis, can solve the problems of inability to analyze the state of martensite, inability to quantitatively analyze geometric dimensions, increase test costs, etc., and achieve the effect of high accuracy

Inactive Publication Date: 2009-11-11
WUHAN IRON & STEEL (GROUP) CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] There is also the article "Displaying the microstructure of silicon-containing dual-phase steel" published in the "Journal of Shanghai University of Technology" in June 1990. Its shortcomings: First, it needs to be pre-etched with 2% nitric acid alcohol for 5 ~6 times, and then etched with reagent for 10~15 seconds
This will not only increase the test cost, but also increase the labor intensity of the test operators, and easily make the sample operators fatigued; the second is that only the volume percentage of martensite can be measured, and the volume, shape, size, and volume of martensite cannot be determined. Third, because the ferrite grain boundary is basically not corroded, it is impossible to quantitatively analyze the geometric dimensions of the phase structure in the same field of view

Method used

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  • Quantitative determination method of martensite in dual phase steel
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  • Quantitative determination method of martensite in dual phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Quantitative determination method of martensite in duplex steel, its steps:

[0029] 1) Sodium metabisulfite and water are configured into an aqueous solution A with a concentration of 1.5% by mass;

[0030] 2) configuring picric acid and alcohol into a solution B with a concentration of 2% by mass;

[0031] 3) Prepare etchant: mix 1.5% aqueous solution A and 2% solution B at a volume ratio of 1:1 and stir evenly;

[0032] 4) Put the dual-phase steel sample into the etchant configured above, take out the sample after the surface of the dual-phase steel sample turns blue, and control the etching environment temperature at 10-20°C;

[0033] 5) Quantitative determination: observe under a metallographic microscope equipped with a color camera;

[0034] 6) Measure with metallographic quantitative analysis software, so as to obtain the results of martensite and ferrite in dual-phase steel.

Embodiment 2

[0036] Quantitative determination method of martensite in duplex steel, its steps:

[0037] 1) sodium metabisulfite and water are configured into an aqueous solution A with a concentration of 2.2% by mass;

[0038] 2) configuring picric acid and alcohol into a solution B with a concentration of 2.9% by mass;

[0039] 3) Prepare etchant: mix 2.2% aqueous solution A and 2.9% solution B at a volume ratio of 1:1 and stir evenly;

[0040] 4) Put the dual-phase steel sample into the etchant configured above, take out the sample after the surface of the dual-phase steel sample turns blue, and control the etching environment temperature at 18-25°C;

[0041] 5) Quantitative determination: observe under a metallographic microscope equipped with a color camera;

[0042] 6) Measure with metallographic quantitative analysis software, so as to obtain the results of martensite and ferrite in dual-phase steel.

Embodiment 3

[0044] Quantitative determination method of martensite in duplex steel, its steps:

[0045] 1) Sodium metabisulfite and water are configured into an aqueous solution A with a concentration of 3.0% by mass;

[0046] 2) Picric acid and alcohol are configured into a solution B with a concentration of 3.8% by mass;

[0047] 3) Prepare etchant: mix 3.0% aqueous solution A and 3.8% solution B at a volume ratio of 1:1 and stir evenly;

[0048] 4) Put the dual-phase steel sample into the etchant configured above, take out the sample after the surface of the dual-phase steel sample turns blue, and control the etching environment temperature at 20-30°C;

[0049] 5) Quantitative determination: observe under a metallographic microscope equipped with a color camera;

[0050] 6) Measure with metallographic quantitative analysis software, so as to obtain the results of martensite and ferrite in dual-phase steel.

[0051] After further analysis and identification of the brown-yellow part o...

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Abstract

The invention discloses a quantitative determination method of martensite in dual phase steel. The steps are as follows: preparing sodium metabisulfite and water into an aqueous solution A with the mass percentage of 1.5-3 percent; preparing trinitrophenol and alcohol into a solution B with the mass percentage of 2-3.8 percent; mixing and uniformly stirring the aqueous solution A and the solution B according to the volume rate of 1:1; putting a dual phase steel sample in the prepared etching agent and taking the sample out after the surface of the sample presents blue, with the etching ambient temperature being 10-30 DEG C; observing under a metaloscope provided with a color camera; and using metallographic quantitative analysis software to determine. The method is characterized in that the texture of each phase in the dual phase steel presents different colors, clear outline and distinct arrangement, and is easy for identification; and qualitative and quantitative analysis can be effectively conducted on the texture of each phase, with high accuracy of the quantitative result. The method plays an important part in production inspection and fundamental researches.

Description

technical field [0001] The invention relates to a detection and analysis method, in particular to a quantitative determination method for martensite in dual-phase steel. Background technique [0002] In recent years, the application of dual-phase steel in the automotive industry has increased year by year with a series of advantages such as low yield strength, strong plastic fit, good fatigue resistance and easy stamping, and the market prospect is promising. The content, volume, shape, size, and existing state of martensite in dual-phase steel play a key role in controlling the mechanical properties and structure of dual-phase steel. Quantitative analysis of martensite in dual-phase steel is an important link in the material development process, which is conducive to understanding the strengthening and toughening mechanism of dual-phase steel, and at the same time provides a direct basis for the composition design of dual-phase steel. [0003] The difficulty in analyzing t...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N1/28
Inventor 张敏刘继雄李平和陈士华孙宜强邱保文吴立新曾静张萍周顺兵李建华关云邓照军
Owner WUHAN IRON & STEEL (GROUP) CORP
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