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Device and method for deep supercooled directional solidification with multi-mode excitation

A technology of directional solidification and deep supercooling, which is applied in the direction of improving process efficiency, etc., can solve the problems of in-situ melting plus directional solidification, complex process, single excitation method, etc., and achieve low microscopic component segregation, sufficient melting, Less defects such as shrinkage cavities

Active Publication Date: 2021-05-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a deep supercooled directional solidification device with multi-mode excitation, which aims to solve the problems of single excitation mode, complicated process and inability to perform in-situ melting plus directional solidification in the prior art.

Method used

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  • Device and method for deep supercooled directional solidification with multi-mode excitation
  • Device and method for deep supercooled directional solidification with multi-mode excitation
  • Device and method for deep supercooled directional solidification with multi-mode excitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] 1. Prepare 1kg of 302 stainless steel (1Cr18Ni9) alloy raw material and put it into the crucible; according to B 2 o 3 、Na 2 B 4 o 7 The ratio is 1:1 to prepare glass purifier and put it into the feeding spoon.

[0103] 2. Turn on the vacuum pump 8 to pump the sealed chamber to 1×10 -6 Pa, then fill the sealed chamber with high-purity argon to 0.8×10 5 Pa, repeat this process five times. Start the smelting device 2 and increase the heating power, observe the melting condition of the alloy through the thermometer 3, and keep the temperature for 30 minutes after the alloy is completely melted.

[0104] 3. Add the glass purifier into the crucible through the feeding device 4, heat the sample to overheat 250K and keep it warm for 10 minutes, then turn off the power of the melting device 2, and repeat the above steps five times after the sample is cooled to room temperature.

[0105] 4. When the alloy temperature drops to 50K supercooling degree, start the power suppl...

Embodiment 2

[0108] 1. Prepare 5kg of Monel K500 nickel-based alloy raw material and put it into a crucible; put B 2 o 3 Add glass cleaner to the spoon.

[0109] 2. Turn on the vacuum pump 8 to pump the sealed chamber to 1×10 -6 Pa, then fill the sealed chamber with high-purity helium to 1×10 5 Pa, repeat this process three times. Start the smelting device 2 and increase the heating power, observe the melting situation of the metal through the thermometer 3, and keep the temperature for 30 minutes after the metal is completely melted.

[0110] 3. Add the glass purifier into the crucible through the feeding device 4, heat the sample to overheat 300K and keep it warm for 20 minutes, then turn off the power supply of the melting device 2, and repeat the above steps six times after the sample is cooled to room temperature.

[0111] 4. When the alloy temperature drops to 230K supercooling degree, start the power supply of the pulling device 7, pull down the crucible at a rate of 1mm / s and j...

Embodiment 3

[0114] 1. Prepare 0.01kg of metal raw material according to the atomic ratio of Ti, Ni, Al, and Cr as 14:3:2:1, and put it into the crucible; 2 , B 2 o 3 , CaO, Al 2 o 3 、Na 2 O, K 2 The ratio of O is 5:2:2:1:1:1 to prepare glass purifier and put it into the feeding spoon.

[0115] 2. Turn on the vacuum pump 8 to pump the sealed chamber to 1×10 -6 Pa, then fill the sealed chamber with a mixture of high-purity helium and argon at a ratio of 1:3 to 0.5×10 5 Pa, repeat this process three times. Start the smelting device 2 and increase the heating power, observe the melting situation of the metal through the thermometer 3, and keep the temperature for 10 minutes after the metal is completely melted.

[0116] 3. Add the glass purifier into the crucible through the feeding device 4, heat the sample to overheat 100K and keep it warm for 5 minutes, then turn off the power of the melting device 2, and repeat the above steps twice after the sample is cooled to room temperature. ...

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Abstract

The present invention relates to the technical field of directional solidification, in particular to a multi-mode excited deep subcooled directional solidification device and method, which includes a reaction furnace, a smelting device, a feeding device, an excitation device, a drawing rod and a drawing device, and the feeding device is used for Add purifying agent to the crucible during the heat melting process; the excitation device includes an excitation chamber that can be filled with liquid metal, a water-cooled ring layer and a liquid level controller that communicates with the excitation chamber, and the liquid level controller is used to control the liquid level of the liquid metal in the excitation chamber ; The pulling device can pull at least a part of the crucible into the excitation chamber at a predetermined speed range through the pulling rod. This device realizes the deep subcooling of the melt through the combination of glass purification and cyclic superheating, and ingeniously combines smelting, liquid metal / water dual cooling and drawing devices. Different modes can be selected to stimulate the directional solidification of the deep supercooled melt, so that it can Obtain deep supercooled directional solidification castings with different microstructure and performance characteristics to meet more research and application needs.

Description

technical field [0001] The invention relates to the technical field of directional solidification, in particular to a multi-mode excited deep supercooled directional solidification device and method. Background technique [0002] The deep supercooling method is to avoid the nucleation of heterogeneous crystal nuclei in the metal and alloy liquid through various effective purification methods, increase the critical nucleation work and inhibit the homogeneous nucleation, so that the liquid metal can obtain crystals that are difficult to obtain under conventional solidification conditions. The achieved supercooling is an effective way to achieve rapid solidification of three-dimensional large-volume liquid metals. At present, the ways to achieve deep subcooling of melt mainly include droplet emulsification method, cyclic superheating method, molten glass purification method and various containerless processing technologies. The supercooled melt often has its unique structure c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/04C22C1/02C22C1/06C22C33/04C21C7/076
CPCB22D27/045C21C7/076C22C1/02C22C1/06C22C33/04Y02P10/20
Inventor 阮莹李星吾魏炳波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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