Method for calibrating partial cooling speed of electroslag ingot in process of producing high-speed steel through electroslag remelting
A local cooling and electroslag remelting technology, which is applied in the field of metallurgy, can solve problems such as the difficulty in achieving accurate control of the quality of electroslag ingots and the lack of quantitative characterization, and achieve the effects of detection effectiveness, fine carbide particles, and a safe and simple method
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0031]The principle of the cooling rate calibration method used in the production of electroslag ingots by electroslag remelting in the present invention is as follows (taking M42 high-speed steel as an example): first, cut out 20 samples of M42 (W2Mo9Cr4Co8) high-speed steel, and its specification is Ф7mm× 2.5mm, grinding and polishing to remove surface oxides; 20 groups of cooling rate experiments were designed respectively, and the experimental groups are shown in Table 1. Utilize ultra-high temperature laser confocal microscope to obtain the fully melted samples after the samples are solidified at different cooling rates; grind and polish the samples, and finally observe the microstructure image with the scanning electron microscope, and the carbonization of the fully melted samples obtained by electron microscope backscattering The object network distance is shown in Table 2, and the backscattered image of the fully melted sample is shown in Figure 3, where (a) 0.5°C / s, (b...
Embodiment 2
[0049] Electroslag remelting produces an M42 high-speed steel ingot with an ingot length of 1140 mm and a radius of 200 mm. The process parameters are shown in Table 3. A platinum-rhodium thermocouple was pre-embedded in the crystallizer (thermocouple position: 600mm in height, 15mm away from the crystallizer wall), and the measured cooling rate here was about 0.72°C / s. After the electroslag remelting is completed, the high-speed steel at the place where the thermocouple is embedded is made into a sample, and after grinding and polishing, it is observed with a scanning electron microscope, and its image is calculated and analyzed with an image analysis software (preferably Image-Pro-Plus). The average mesh distance of the carbides obtained is 49.09 μm; the distance between the carbide mesh of M42 high-speed steel observed by JSM6480LV scanning electron microscope (SEM), see Figure 4 ; The quantitative relationship between the average grid distance and the cooling rate brought...
Embodiment 3
[0053] Electroslag remelting produces an M42 high-speed steel with an ingot length of 1230 mm and a radius of 180 mm. The process parameters are shown in Table 4. A platinum-rhodium thermocouple was pre-embedded in the crystallizer (thermocouple position: 600mm in height, 55mm away from the crystallizer wall), and the cooling rate here was measured to be about 2.62°C / s. The high-speed steel at the place where the thermocouple is embedded is made into a sample, and after grinding and polishing, it is observed with a scanning electron microscope, and the image is calculated and analyzed with Image-Pro Plus image analysis software, and the average carbide mesh distance is 42.84μm; JSM6480LV Scanning electron microscope (SEM) observation of the measured M42 high-speed steel carbide network spacing, see Figure 5 ; The quantitative relationship between the average mesh distance and the cooling rate of the carbides brought into M42 high-speed steel, where the cooling rate is about 2...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More