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Preparation method of metallographic specimen of oriented silicon steel continuous casting billet

A technology for metallographic samples and oriented silicon steel, which is applied in the preparation, sampling, and instrumentation of test samples, can solve the problems of high-quality metallographic samples that do not affect the observation effect, and does not solve the quality of oriented silicon steel samples. The effect of sample quality

Active Publication Date: 2020-06-12
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not solve the problem that the micro-cracks in the grain-oriented silicon steel affect the quality of the sample.
[0005] In view of the fact that the traditional method of preparing metallographic samples of grain-oriented silicon steel cannot provide high-quality metallographic specimens without affecting the observation effect, it is necessary to develop more effective sample preparation methods for grain-oriented silicon steel continuous casting slab samples

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0027] A method for preparing a metallographic sample of an oriented silicon steel continuous casting slab according to the present invention comprises the following steps:

[0028] 1) Blank processing: process the continuous casting billet into a cube metallographic sample blank with a side length of 2 to 3 cm;

[0029] 2) Acid etching: use dilute hydrochloric acid with a concentration of 10% to 15% and a temperature of 60 to 80°C to etch the metallographic sample blank for 3 to 5 minutes; take out the metallographic sample immediately after the corrosion is completed, Rinse with water and dry;

[0030] 3) preparing mixed powder; uniformly mixing micron-sized metal powder and micron-sized bakelite powder in a volume ratio of 1: (2-3) to obtain mixed powder;

[0031] 4) Sample loading; evenly spread a layer of mixed powder on the bottom of the machine cavity of the hot mounting machine, and the layer thickness of the mixed powder is 2-3mm; then put the metallographic sample i...

Embodiment 1

[0042] In this embodiment, the sample for inclusion analysis of grain-oriented silicon steel is prepared, and the specific process is as follows:

[0043] 1) blank processing, the continuous casting blank is processed into a cube metallographic sample blank with a side length of 2cm with a sawing machine;

[0044]2) Acid etching, acid etching is carried out with dilute hydrochloric acid, the concentration of hydrochloric acid is 12%, the temperature of hydrochloric acid is controlled at 70°C, and the pickling time is controlled at 4 minutes. The samples were taken out immediately after corrosion, rinsed with clean water, and then dried with a hair dryer immediately.

[0045] 3) Preparation of mixed powder, uniformly mixing micron-sized metal powder and micron-sized bakelite powder at a volume ratio of 1:3 to obtain mixed powder. Wherein, the particle size of the bakelite powder is 20 μm to 50 μm, and the particle size of the metal powder is less than 20 μm. The micron-sized ...

Embodiment 2

[0053] In this embodiment, the preparation of grain-oriented silicon steel microstructure analysis sample, the specific process is as follows:

[0054] 1) blank processing, the continuous casting blank is processed into a cube metallographic sample blank with a side length of 2.5cm with a sawing machine;

[0055] 2) Acid etching, acid etching is carried out with dilute hydrochloric acid, the concentration of hydrochloric acid is 14%, the temperature of hydrochloric acid is controlled at 75°C, and the pickling time is controlled at 4.5min. After the metallographic sample is corroded, take it out immediately, rinse it with clean water, and then immediately dry it with a hair dryer.

[0056] 3) Preparation of mixed powder, uniformly mixing micron-sized metal powder and micron-sized bakelite powder at a volume ratio of 1:2 to obtain mixed powder. Wherein, the particle size of the bakelite powder is 20 μm to 50 μm, and the particle size of the metal powder is less than 20 μm. Mic...

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Abstract

The invention relates to a preparation method of a metallographic specimen of an oriented silicon steel continuous casting billet. The preparation method comprises the following steps: 1) performing blank processing; 2) performing acid etching; 3) preparing mixed powder; 4) sample loading; 5) mounting a sample; 6) grinding the sample; 7) roughly polishing the sample; 8) finely polishing the sample. The metallographic specimen is inlaid by adopting mixed powder consisting of micron-sized metal powder and micron-sized bakelite powder; in the sample preparation process, it is ensured that microcracks of oriented silicon steel are filled with molten mixed powder inserts, the cleanliness of a polished surface cannot be affected by the microcracks in the subsequent sample grinding and polishingprocess, and therefore the quality of a metallographic sample is ensured; the polished metallographic specimen can be directly subjected to inclusion observation or structure observation after corrosion, and an accurate analysis result is provided for scientific research and production.

Description

technical field [0001] The invention relates to the technical field of metallographic sample preparation, in particular to a method for preparing a metallographic sample of an oriented silicon steel continuous casting slab. Background technique [0002] Metallographic observation of iron and steel materials is a commonly used method for analyzing inclusions and metallographic structures in iron and steel materials. The traditional preparation process of metallographic samples of oriented silicon steel continuous casting slabs is as follows: process the continuous casting slabs into 2-3cm The cube, and then grind the sample. First, use a coarse grinding wheel to polish the surface to be observed, and then use water-grinding abrasive paper of different particle sizes to polish the surface to be observed. Each time the grinding direction is at an angle of 90 degrees to the previous grinding direction, alternating After grinding several times, use 1500# water-grinding sandpaper ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32G01N1/34
CPCG01N1/286G01N1/32G01N1/34G01N2001/2866
Inventor 尚德礼廖相巍康磊吕春风康伟李德军张维维常桂华李广帮
Owner ANGANG STEEL CO LTD
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