CN113061892A - Metallographic measurement method for martensite area content of ferrite-martensite dual-phase steel - Google Patents
Metallographic measurement method for martensite area content of ferrite-martensite dual-phase steel Download PDFInfo
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- CN113061892A CN113061892A CN202110268856.7A CN202110268856A CN113061892A CN 113061892 A CN113061892 A CN 113061892A CN 202110268856 A CN202110268856 A CN 202110268856A CN 113061892 A CN113061892 A CN 113061892A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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Abstract
The invention belongs to the field of metallographic detection, and particularly relates to a metallographic measurement method for the martensite area content of ferrite-martensite dual-phase steel. The technical scheme of the invention is as follows: in the metallographic detection, a sodium metabisulfite-ferric chloride aqueous solution is used as a corrosive agent to corrode the surface of a sample of the ferrite martensite dual-phase steel. The metallographic measuring method for the martensite area content of the ferrite-martensite dual-phase steel provided by the invention is simple, convenient and reliable.
Description
Technical Field
The invention belongs to the field of metallographic detection, and particularly relates to a metallographic measurement method for the martensite area content of ferrite-martensite dual-phase steel.
Background
In the measurement of the area content of the second phase in the steel by adopting a metallographic detection method, the prior art mainly carries out binarization processing on different phases in an image by image software, extracts the second phase and then carries out measurement; this requires a large color difference between different phases in the steel, and the larger the color difference between the two phases is, the easier the software is to distinguish and extract, and the more accurate the measurement result is.
In metallographic detection, 4% nitric acid alcoholic solution is adopted for corrosion, and the color difference between ferrite and martensite is small, so that the measurement is difficult.
The current general detection method is to adopt a method of a lapero color corrosive to color ferrite into blue or yellow, martensite is not colored, the corrosion method can solve the problem of area measurement, but the corrosion method is relatively complex, the corrosion difficulty is high, and the control is not easy, so the repeatability of a detection result is not good, the result deviation is large due to different corrosion conditions, the false appearance is caused, and the detection result is influenced, the lapero reagent can only support the corrosion of a disposable sample, and in the using process, if the lapero reagent is carelessly stained on the skin, the skin is dyed, the cleaning is difficult, and the long-time fading is avoided. And the essential chemical picric acid in the lapero corrosive is a special reagent, so that the use is limited, and the laboratory has difficulty in purchasing the chemical, so that the difficulty in measuring the martensite is increased.
Disclosure of Invention
The invention provides a metallographic measuring method for the martensite area content of ferrite-martensite dual-phase steel, which is simple, convenient and reliable.
The technical scheme of the invention is as follows:
in the metallographic detection, a sodium metabisulfite-ferric chloride aqueous solution is used as a corrosive agent to corrode the surface of a sample of the ferrite martensite dual-phase steel.
Further, according to the metallographic measurement method for the martensite area content of the ferrite-martensite dual-phase steel, the preparation process of the aqueous solution of sodium metabisulfite and ferric chloride is as follows: dissolving 10g of sodium metabisulfite into 100ml of water to form a sodium metabisulfite solution; dissolving 10g of ferric chloride into 100ml of water to form ferric chloride solution; and (3) dissolving 5ml of the ferric chloride solution into 15ml of the sodium metabisulfite solution, and uniformly mixing to obtain the sodium metabisulfite ferric chloride aqueous solution.
The invention has the beneficial effects that: the corrosive agent is simple and convenient to prepare and convenient to take, use and store; the detection method has good repeated detection result and is less influenced by manual operation. The sample corrosion method has good corrosion effect on the martensite of the low-carbon lath, and is also suitable for judging and observing whether the workpiece is completely quenched and whether ferrite exists in the quenching process of some low-carbon steels.
Drawings
FIG. 1 is a metallographic structure diagram of an example;
FIG. 2 is a schematic diagram of an exemplary image software measurement;
FIG. 3 is a metallographic structure diagram of a comparative example;
FIG. 4 is a schematic diagram of comparative example image software measurement.
Detailed Description
Examples
The preparation method of the sodium metabisulfite-ferric chloride aqueous solution comprises the following steps: dissolving 10g of sodium metabisulfite into 100ml of water to form a sodium metabisulfite solution; dissolving 10g of ferric chloride into 100ml of water to form ferric chloride solution; and (3) dissolving 5ml of the ferric chloride solution into 15ml of the sodium metabisulfite solution, and uniformly mixing to obtain the sodium metabisulfite ferric chloride aqueous solution.
The sample is a ferrite and martensite dual-phase structure formed by BJ55-Ti steel under certain heat treatment conditions.
And preparing a sample, namely grinding the detection surface to be flat, then grinding the detection surface on abrasive paper with different particle sizes, and finally polishing the surface of the sample to obtain a smooth and low-hair-mark sample surface.
And putting the detection surface of the sample into the prepared corrosive liquid for corrosion for about 30 seconds until the surface becomes dark. And taking out the sample, washing the sample with water, and drying the sample.
When the sample is observed under a microscope, the martensite is corroded to be yellow, part of tempered martensite is corroded to be black, and the ferrite does not change color. The metallographic structure is shown in FIG. 1.
And measuring the martensite by image software to obtain a measurement result. As shown in fig. 2, the green extract fraction is well matched to the morphology, and the martensite content was measured to be about 18%.
Comparative example
The sample is a ferrite and martensite dual-phase structure formed by BJ55-Ti steel under certain heat treatment conditions, and the same batch as the example is formed.
And corroding the detection surface of the sample by using a 4% nitric acid alcohol solution. The metallographic structure is shown in FIG. 3.
The area of the second phase is measured under image software, as shown in fig. 4, the green extraction part is less, the detection result is about 12%, and the measurement result is smaller.
Claims (2)
1. A metallographic measurement method for the area content of martensite of ferrite-martensite dual-phase steel is characterized in that in metallographic detection, a sodium metabisulfite-ferric chloride aqueous solution is used as a corrosive agent to corrode the surface of a sample of the ferrite-martensite dual-phase steel.
2. The metallographic measurement method for the martensite area content of the ferrite-martensite dual-phase steel according to claim 1, wherein the aqueous solution of sodium metabisulfite and ferric chloride is prepared by the following steps: dissolving 10g of sodium metabisulfite into 100ml of water to form a sodium metabisulfite solution; dissolving 10g of ferric chloride into 100ml of water to form ferric chloride solution; and (3) dissolving 5ml of the ferric chloride solution into 15ml of the sodium metabisulfite solution, and uniformly mixing to obtain the sodium metabisulfite ferric chloride aqueous solution.
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