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Microstructure display method of ferrite and martensite dual-phase steel

A technology of microstructure and display method, which is applied in the preparation, sampling, and instrumentation of test samples, and can solve the problems of picric acid toxicity and procurement difficulties

Active Publication Date: 2021-05-07
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problem that picric acid, one of the components of Lepera reagent, is toxic and difficult to purchase, the invention provides a method for displaying the microstructure of ferritic-martensitic dual-phase steel, which can overcome the problem of picric acid in the corrosion method of Lepera reagent. Affected by limited procurement, the required consumables are all conventional metallographic laboratory consumables, and the required chemicals are easy to purchase and widely used; low cost, easy operation, uniform and stable corrosion effect, clear grain boundaries, and high contrast; The microstructure of the ferritic-martensitic dual-phase steel treated by the method of the present invention has a clear and good display effect

Method used

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  • Microstructure display method of ferrite and martensite dual-phase steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] To analyze the martensite content in ferritic-martensitic dual-phase steel for automobiles, the microstructure display method adopted includes the following steps:

[0034] (1) Grinding sample: Grind the sample to be tested and the standard sample with metallographic water abrasive paper in the order of 120 mesh, 240 mesh, 600 mesh, and 1000 mesh, and replace the sample by 90° after each sandpaper is used. Change the sandpaper after the direction, and grind until the scratches of the previous sandpaper are completely removed. After each sandpaper, the sample should be rinsed with running water;

[0035] (2) Polishing: Polish the test sample and the standard sample respectively after grinding, first perform rough polishing, use 2.5μm diamond suspension, and put the test sample and the standard sample at a speed of 600rad / min respectively Polish on the canvas polishing disc for 60s, rinse with running water;

[0036] Then perform fine polishing, use 1.0 μm diamond suspen...

Embodiment 2

[0042] To analyze the martensite content in ferrite-martensitic dual-phase steel for automobiles, the microstructure display method adopted includes the following steps:

[0043] (1) Grinding sample: Grind the sample to be tested and the standard sample with metallographic water abrasive paper in the order of 120 mesh, 240 mesh, 600 mesh, and 1000 mesh, and replace the sample by 90° after each sandpaper is used. Change the sandpaper after the direction, and grind until the scratches of the previous sandpaper are completely removed. After each sandpaper, the sample should be rinsed with running water;

[0044] (2) Polishing: respectively polish the ground sample to be tested and the standard sample, first perform rough polishing, use 2.5 μm diamond suspension, and polish the sample on a canvas polishing disc with a rotational speed of 900rad / min for 50s , rinse with running water;

[0045] Then perform fine polishing, use 1.0μm diamond suspension, polish the sample on a velvet...

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Abstract

The invention relates to the technical field of metallographic sample preparation, and concretely relates to a microstructure display method of ferrite and martensite dual-phase steel. The method comprises the following steps: grinding a sample; polishing; corroding: preparing 100 mL of a saturated sodium thiosulfate aqueous solution at room temperature, adding 3 g of sodium pyrosulfite and 1 mL of nitric acid into the sodium thiosulfate aqueous solution to obtain a corrosive liquid, respectively standing a to-be-tested sample and a standard sample in the corrosive liquid, corroding until the surface is blue black, and washing and drying; performing microscopic observation to obtain that after corrosion, ferrite is blue black, and martensite is white; and performing an IA graph analysis technology: calculating the martensite content by adopting a binary extraction analysis means. The consumables required by the method are conventional metallographic laboratory consumables, and the required chemicals are convenient to purchase and widely use; the cost is low, the operation is simple and convenient, the corrosion effect is uniform and stable, the grain boundary is clear, and the contrast degree is high; and the ferrite and martensite dual-phase steel treated by the method is clear and good in microscopic structure display effect.

Description

technical field [0001] The invention relates to the technical field of metallographic sample preparation, in particular to a method for displaying the microstructure of ferrite-martensitic dual-phase steel. Background technique [0002] In recent years, with the rapid development of the automobile industry, energy conservation and environmental protection have become an inevitable trend in the development of modern automobiles. One of the important measures is to reduce the weight of automobiles. The use of high-strength dual-phase steels to replace conventional steels has been carried out in major enterprises. Research and development, ferritic martensitic dual-phase steel is just one of them. Iron-horse dual-phase steel distributes martensite on the ferrite matrix so that it has a good combination of strength and plasticity, which greatly promotes its wide application. Since the volume fraction of martensite in ferrite has a great influence on the performance of dual-phas...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N21/84
CPCG01N1/286G01N1/32G01N21/84
Inventor 薛俊峰倪文啸魏代斌陈统王立涛胡曼梁春峰田广明
Owner RIZHAO STEEL HLDG GROUP