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Directional solidification method for metal material

A technology of directional solidification of metal materials, applied in the field of directional solidification of metal materials, can solve problems such as limited cooling effect and easy oxidation, achieve the effect of simplifying the production process, avoiding oxidation, and meeting the needs of research and application

Inactive Publication Date: 2020-06-05
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 method for directional solidification of metal materials, which aims to solve the problems existing in the prior art that in-situ melting and directional solidification cannot be performed, the cooling effect is limited, and it is easy to oxidize.

Method used

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  • Directional solidification method for metal material
  • Directional solidification method for metal material
  • Directional solidification method for metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] According to Fe 80 Cr 15 Ni 5 0.05kg-10kg of alloy raw material is prepared in atomic ratio, and put into the crucible 3, the height of the crucible 3 is 15mm-350mm, and the outer diameter is 15-120mm. Close the container 1, turn on the vacuum pump 11 to evacuate the sealed chamber to 1×10 -6 ~1×10 -4 Pa, then fill the sealed chamber with high-purity argon to 0.8×10 5 ~1×10 5 Pa, repeat this process 3 to 5 times. Turn on the high-frequency induction coil to adjust the current from 0 to 10A-35A, and heat the sample in the crucible 3 through the graphite heating jacket, wherein the graphite heating jacket has a thickness of 10mm-20mm and a height of 20mm-400mm. Through the infrared thermometer 7 set outside the glass observation window above the sealed chamber, the melting condition of the sample is judged, and the sample is kept warm for 5-30 minutes after melting, wherein the thickness of the insulation layer is 10mm-30mm. Turn on the power supply of the drawing ...

Embodiment 2

[0069] According to Fe 80 Cr 14.8 Ni 5 Ce 0.2 Prepare 8kg of alloy raw materials in atomic ratio, put Fe, Cr, Ni metal raw materials into crucible 3, the height of crucible 3 is 350mm, outer diameter is 100mm; Ce is put on the feeding spoon in feeding mechanism 9. Close the sealed chamber of high vacuum, turn on the vacuum pump 11 to pump the sealed chamber to 1×10 -6 Pa, then fill the sealed chamber with high-purity argon to 1×10 5 Pa, repeat this process 4 times. Turn on the high-frequency induction coil, adjust the current from 0 to 35A, and heat the sample in the crucible 3 through the graphite heating jacket, wherein the graphite heating jacket has a thickness of 20mm and a height of 400mm. Through the infrared thermometer 7 arranged outside the glass observation window above the sealed chamber, the melting condition of the sample is judged. After the sample is melted, it is kept warm for 20 minutes, wherein the thickness of the insulation layer is 30mm. Rotate the ...

Embodiment 3

[0071] According to Ti 80 Ni 10 al 5 Cr 5 0.1 kg of alloy raw material was prepared in atomic ratio, and put into crucible 3, the height of crucible 3 was 20 mm, and the outer diameter was 15 mm. Close the sealed chamber of high vacuum, turn on the vacuum pump 11 to pump the sealed chamber to 1×10 -4 Pa, then fill the sealed chamber with high-purity argon to 0.8×10 5 Pa, repeat this process 3 times. Turn on the high-frequency induction coil, adjust the current from 0 to 10A, and heat the sample in the crucible 3 through the graphite heating jacket, wherein the graphite heating jacket has a thickness of 10mm and a height of 25mm. Through the infrared thermometer 7 arranged outside the glass observation window above the sealed chamber, the melting condition of the sample is judged, and the sample is kept warm for 5 minutes after melting, wherein the thickness of the insulation layer is 15mm. Turn on the power supply of the drawing device 6, set the motor speed to 1r / min, t...

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Abstract

The invention relates to the technical field of directional solidification, in particular to a directional solidification method for a metal material. The directional solidification method comprises the following steps: S1, the metal material is prepared and put into a crucible; S2, the crucible is placed in a sealing chamber of a container, and the sealing chamber is filled with protective gas after the sealing chamber is vacuumized; S3, the crucible is heated by using a heater so as to melt the metal material in the crucible; S4, the crucible is drawn into a hollow channel of a crystallizerat a predetermined speed range through a crystallization rod, so that the metal material is directionally solidified; and S5, after the directional solidification is completed, the crucible is pushedto and stretches out of the heater through the crystallization rod, the container is opened, the crucible is taken out, and demolding is performed to obtain a directional solidification ingot. According to the method, the process is relatively simple, and smelting, liquid metal / water dual cooling and a drawing device are combined ingeniously, so that the large directional solidification ingot withexcellent performance can be obtained.

Description

technical field [0001] The invention relates to the technical field of directional solidification, in particular to a method for directional solidification of metal materials. Background technique [0002] Directional solidification technology is very important and widely used in industrial and high-tech fields. It is used to produce magnetic materials, aviation and ground gas turbine blades, self-generated composite materials and various functional crystals. Single crystal superalloy is currently the main material for manufacturing advanced aero-engine and gas turbine blades, but compared with directionally solidified superalloy, the manufacturing process is more difficult, the casting yield is low, and the heat treatment process is complicated, which increases the manufacturing cost and is difficult to manufacture. Large leaves with complex structure. Therefore, directionally solidified superalloys have broad development prospects in the manufacture of large blades with c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04B22D7/06C22C38/40C22C14/00
CPCB22D7/064B22D27/045C22C14/00C22C38/005C22C38/40
Inventor 阮莹李星吾魏炳波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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