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Method and device for improving metal solidification defects and refining solidification textures

A technology of solidification structure and metal solidification, which is applied in the fields of improving metal solidification defects, refining solidification structure and devices, and achieving the effects of improving utilization rate, refining solidification structure, and uniform composition

Active Publication Date: 2013-06-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the above-mentioned problems in the prior art, and the technical problem to be solved is to solve problems such as A segregation, shrinkage cavity and loose defects inside steel ingots, castings and slabs, and improve the solidification structure, and provide a method for improving metal solidification defects and refining Methods and devices for coagulating tissue

Method used

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  • Method and device for improving metal solidification defects and refining solidification textures
  • Method and device for improving metal solidification defects and refining solidification textures
  • Method and device for improving metal solidification defects and refining solidification textures

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Cast 29 tons of die-cast steel ingots, the material of which is 40Cr. After the mold assembly tooling is completed, a magnetic field generating device is placed on the upper end of the riser. The frequency of the excitation current is 2.5Hz, and the excitation voltage is 200V. The magnetic field generating device bakes and heats the cladding layer and the inner surface to 850°C before immersing in the molten metal. After the steel ingot is poured, a magnetic field generating device is added in the riser of the steel ingot. During the application of the magnetic field, argon protection is carried out inside the magnetic field generating device. The argon pressure is 0.5 MPa, the flow rate is 0.2 liters / minute, and the magnetic field application time is 10 hours. The solidified structure of the prepared steel ingot is as follows: Figure 7 shown, from Figure 7 It can be seen that the steel ingot has a dense structure, no central shrinkage cavity and obvious A segregatio...

Embodiment 2

[0065] Cast 1 ton of sand mold steel ingot, the steel ingot is made of 45# steel, after the mold assembly tooling is completed, place a magnetic field generating device on the upper end of the riser. The frequency of the excitation current is 2.5Hz, and the excitation voltage is 100V. The magnetic field generating device bakes and heats the cladding layer and the inner surface to 900°C before immersing in the molten metal. After the steel ingot is poured, a magnetic field generating device is added in the riser of the steel ingot. During the application of the magnetic field, argon protection is carried out inside the magnetic field generator, the pressure of the argon gas is 1 MPa, the flow rate is 0.4 liter / min, and the magnetic field application time is 1 h. Figure 8(a) is the solidification structure of a conventional 1-ton sand-cast steel ingot, and Figure 8(b) is the solidification structure of a 1-ton sand-cast steel ingot prepared in this embodiment. It can be seen fro...

Embodiment 3

[0067] Casting 24 tons of continuous casting billet size is 600mm × 1000mm × 3400mm, material is ZG15Cr2Mo1, after the mold assembly tooling is completed, a magnetic field generator is placed on the upper end of the riser. The frequency of the excitation current is 5Hz, and the excitation voltage is 200V. The magnetic field generating device bakes and heats the cladding layer and the inner surface to 960°C before immersing in the molten metal. During the pouring process of the molten metal, a magnetic field generating device is added in the crystallizer. During the application of the magnetic field, argon protection is carried out inside the magnetic field generator, the argon pressure is 1.3 MPa, the flow rate is 0.5 liters / minute, and the magnetic field application time is 8 hours. The analysis results of the steel ingot are as follows Figure 9 As shown in the figure, it can be seen that there is no obvious central shrinkage cavity, porosity and A segregation inside the ste...

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Abstract

The invention relates to a method and a device for improving metal solidification defects and refining solidification textures. The method and the device comprise an excitation power supply and a magnetic field generating device, wherein the magnetic field generating device is immersed into casting piece (casting blank) and continuous casting metal liquid, crystal nucleuses on the inner surface of the magnetic field generating device are stripped in the metal liquid through electromagnetic force and the joule heating effect, melt vibration and convection are caused by the magnetic field, a large number of crystal nucleuses are continuously dispersed into the metal liquid so as to shorten the feeding distance in a metal solidification process, restrain casting piece and casting blank (ingot) central defects, relieve A segregation and refine the solidification textures, and simultaneously the surface is prevented from being rolled inside in mingling way. The method and device disclosed by the invention are used for preparing casting pieces, continuous casting blanks, mold casting ingots, mold casting blanks and hollow blanks of black metal and non-ferrous metal under vacuum and non-vacuum conditions.

Description

technical field [0001] The present invention is a method and device for improving solidification defects and refining solidification structure, and relates to the preparation of ferrous and non-ferrous metal castings, continuous casting slabs, mold casting ingots, mold casting slabs and hollow slabs under vacuum and non-vacuum conditions. It can inhibit A segregation and the formation of central shrinkage porosity, and can refine the solidified structure at the same time. Background technique [0002] In recent years, with the rapid development of my country's electric power industry, nuclear industry and petrochemical industry, the demand for large castings, large steel ingots, and large blanks is increasing, and the quality requirements for large castings and forgings are also getting higher and higher. Steel ingots and continuous casting slabs are the early products of large castings and forgings, and their quality is particularly important for improving the quality of la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115B22D27/02
Inventor 马晓平傅排先李殿中刘宏伟栾义坤李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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