A method for dual-frequency ultrasonic detection of inclusions in bearing steel

A technology of inclusions and ultrasonic waves, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, the improvement of process efficiency, instruments, etc., can solve the problems such as the inability to overall reflect the purity of molten steel smelting, pollution discharge in the detection process, and complex sample processing. To achieve the effect of stable scanning and detection process, accurate defect positioning, and efficient and accurate detection

Active Publication Date: 2022-05-31
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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Problems solved by technology

[0004] Therefore, the existing detection methods have complex sample processing, insufficient detection accuracy, pollution discharge defects in the detection process, and the detection results cannot reflect the purity of molten steel smelting as a whole.

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  • A method for dual-frequency ultrasonic detection of inclusions in bearing steel
  • A method for dual-frequency ultrasonic detection of inclusions in bearing steel
  • A method for dual-frequency ultrasonic detection of inclusions in bearing steel

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Embodiment Construction

[0035] The present invention will be further described in detail below with reference to the embodiments of the accompanying drawings.

[0036] This embodiment relates to a method for ultrasonically detecting inclusions in bearing steel, and the detection object is medium carbon bearing steel. Specific steps are as follows

[0037](1) Take a cylindrical bearing steel sample with a diameter of 50mm and a length of 500mm as the analysis sample;

[0038] (2) Heat treatment of the sample: quenching and tempering, the quenching heating temperature of bearing steel is 800-900 ℃, after the temperature reaches 25-45min, the temperature is kept for 25-45 minutes, and it is cooled in water when it is released from the furnace. The water is cooled for the second time, and after the water is discharged, it is air-cooled to room temperature; the tempering heating temperature of the tempering is 400-700 ° C, and the air-cooling is carried out after holding for 20-40 minutes.

[0039] (3) ...

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Abstract

The invention relates to a method for detecting inclusions in bearing steel by dual-frequency ultrasonic waves. A cylindrical bearing steel sample that has undergone quenching, tempering heat treatment and gold processing is installed on a water immersion high-frequency ultrasonic flaw detector, and a 10 MHz flat probe and The 25MHz focusing probe jointly detects the sample, and analyzes the A and C scanning images formed synchronously to determine the size, quantity and distribution of inclusions in the medium carbon bearing steel. In meeting the international high standard bearing steel testing requirements Based on this, a unique standard for judging the purity level of steel has been formed. In addition, this experimental method can accurately locate the detected inclusions, and can accurately locate the location of the inclusions, which is convenient for further research and analysis of the characteristics of the inclusions, and guides metallurgical production.

Description

technical field [0001] The invention relates to the technical field of detection of steel inclusions, and more particularly to a method for ultrasonic detection of inclusions in steel samples. Background technique [0002] In recent years, with the continuous and rapid development of the bearing manufacturing industry, bearing steel is one of the most stringent steel types in all steel production, and its purity requirements are getting higher and higher. and stability factor. Therefore, the size control of inclusions in steel has become the key work content of metallurgical technicians and metal detectors. [0003] There are many test methods for detecting inclusions in medium carbon bearing steel. Compared with the common quenching fracture method, acid leaching fracturing method and blue brittle fracture method, the acid leaching fracturing method not only has the problem of detecting waste water pollution, but also has a negative impact on inclusions. There is also the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/0234G01N2291/0289Y02P10/20
Inventor 陆燕婷许晓红白云颉军定范海东钱震张超陈晓东吴军戚晓光顾林峰
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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