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Method for measuring martensite content in heat rolling dual-phase steel

A hot-rolled dual-phase steel and martensite technology, which is used in measuring devices, preparation of test samples, and material analysis by optical means, can solve the problems of insufficient contrast and inability to accurately extract the objects to be tested. Achieve the effect of increasing contrast, avoiding errors, and accurately measuring

Inactive Publication Date: 2013-11-27
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to solve the lack of martensitic ferrite contrast in the prior art, the inability to accurately extract the phase to be measured in the image analyzer, and the use of special image analysis software in the prior art to count The shape and size of martensite in dual-phase steel, but the technical problem of how to obtain the percentage of martensite in dual-phase steel is not explained, thus providing a method that can be used for the production process of martensitic steel and method for direct evaluation of its performance

Method used

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  • Method for measuring martensite content in heat rolling dual-phase steel
  • Method for measuring martensite content in heat rolling dual-phase steel
  • Method for measuring martensite content in heat rolling dual-phase steel

Examples

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example 1

[0021] The DP600 hot-rolled steel plate is selected as the sample, and its chemical composition (by weight percentage) is: C: 0.06%, Si: 0.90%, Mn: 1.39%, P: 0.014%, S: 0.003%, Cr: 0.25%, Mo: 0.20% and the balance of iron and unavoidable impurities.

[0022] Follow the steps below to process the sample to be tested to reveal its metallographic structure.

[0023] Sample cutting: Cut off the edge deformation area of ​​the sample by about 2mm on a precision cutting machine to obtain a sample to be tested with a specification of 20mm×15mm.

[0024] Specimen Mounting: Cold mount the specimen with a mixed solution of epoxy resin and ethylenediamine.

[0025] Sample preparation: The above sample is coarsely ground and finely polished, and then the sample to be tested is placed in a mixture of 1wt% sodium metabisulfite aqueous solution and 4.2wt% trinitrophenol alcohol solution according to the volume ratio of 1:1. The mixed solution was corroded for about 40s at room temperature, ...

example 2

[0031] The DP600 hot-rolled steel plate is selected as the sample, and its chemical composition (by weight percentage) is: C: 0.06%, Si: 0.90%, Mn: 1.39%, P: 0.014%, S: 0.003%, Cr: 0.25%, Mo: 0.20% and the balance of iron and unavoidable impurities.

[0032] Follow the steps below to process the sample to be tested to reveal its metallographic structure.

[0033] Sample cutting: Cut off the edge deformation area of ​​the sample by about 2mm on a precision cutting machine to obtain a sample to be tested with a specification of 20mm×15mm.

[0034] Specimen Mounting: Cold mount the specimen with a mixed solution of epoxy resin and ethylenediamine.

[0035] Sample preparation: The above-mentioned sample is coarsely ground and finely ground and polished, and then the sample to be tested is placed in a mixture of 0.9wt% sodium metabisulfite aqueous solution and 4.2wt% trinitrophenol alcohol solution according to the volume ratio of 1:1. The resulting mixed solution was corroded fo...

example 3

[0041]The DP600 hot-rolled steel plate is selected as the sample, and its chemical composition (by weight percentage) is: C: 0.06%, Si: 0.90%, Mn: 1.39%, P: 0.014%, S: 0.003%, Cr: 0.25%, Mo: 0.20% and the balance of iron and unavoidable impurities.

[0042] Follow the steps below to process the sample to be tested to reveal its metallographic structure.

[0043] Sample cutting: Cut off the edge deformation area of ​​the sample by about 2mm on a precision cutting machine to obtain a sample to be tested with a specification of 20mm×15mm.

[0044] Specimen inlay: clamp the sample to be tested with a jig.

[0045] Sample preparation: After the above sample is coarsely ground and finely ground and polished, then the sample to be tested is placed in a mixture of 1.3wt% sodium metabisulfite aqueous solution and 3.9wt% trinitrophenol alcohol solution according to the volume ratio of 1:1. The resulting mixed solution was corroded for 60s at room temperature, rinsed with running water...

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Abstract

The invention provides a method for measuring martensite content in heat rolling dual-phase steel. The method comprises the following steps in sequence: forming a sample to be measured of the heat rolling dual-phase steel with a smooth surface; performing grinding and burnishing on the sample to be measured, and placing the sample to be measured into a mixed solution for corrosion, wherein the mixed solution is prepared by mixing a water solution of sodium metabisulfite with the mass concentration of 0.85-1.4% and a alcoholic solution of trinitrophenol with the mass concentration of 3.9-4.2% according to the volume ratio of (0.9-1.1):1; cleaning and drying the sample to be measured; shooting a plurality of electronic photos in the thickness direction of the sample to be measured; using metallography image analysis software to process the plurality of electronic photos to obtain the martensite content of the sample to be measured. The invention has the advantages that the method can realize complete statistics for a differential view field, can increase contrast degree of grayness of each tissue, and can accurately measure the martensite content in the heat rolling dual-phase steel.

Description

technical field [0001] The invention belongs to the technical field of metallographic analysis of hot-rolled dual-phase steel, and specifically relates to a method capable of accurately measuring the content of martensite in hot-rolled dual-phase steel. Background technique [0002] Generally, hot-rolled dual-phase steel is based on phase transformation strengthening and is composed of ferrite and martensite. Studies have shown that within a certain range, the content of martensite increases, the tensile strength increases, the elongation decreases, and the yield ratio However, when the volume fraction of martensite exceeds 25%, the mechanical properties of the material will continue to decrease with the increase of the volume fraction of martensite. Therefore, accurate and quantitative analysis of the content of martensite in hot-rolled dual-phase steel is of great significance for the evaluation of steel mechanical properties and the determination of hot-rolling process. ...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N21/84
Inventor 陈容吴安术刘锦燕赵骏
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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