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Method for controlling direction of solidification structure of cast ingot through electricity conductive crystallizer electroslag remelting

A technology for electroslag remelting and solidification structure, applied in the field of metallurgy, can solve the problems of fixed direction of ingot solidification structure and difficult to control flexibly, and achieve the effect of surface quality assurance, reducing melting speed and good surface quality

Active Publication Date: 2017-01-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direction of the ingot solidification structure is relatively fixed, which is difficult to control flexibly

Method used

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  • Method for controlling direction of solidification structure of cast ingot through electricity conductive crystallizer electroslag remelting
  • Method for controlling direction of solidification structure of cast ingot through electricity conductive crystallizer electroslag remelting

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A method for electroslag remelting of a conductive mold to control the direction of solidification structure of an ingot. The schematic diagram of electroslag remelting is as follows figure 1 As shown, the selected steel type is H13 steel, which specifically includes the following steps:

[0046] Step 1, preparation and baking of slag:

[0047] (1) Prepare 30Kg of high-conductivity slag; wherein, the slag contains components and their mass percentages: CaF 2 : 50~60%, CaO: 18~24%, Al 2 o 3 : 20-25%, MgO: 2-5%, the sum of the mass percentages of each component is 100%, and the electrical conductivity of the slag system at 1900K is 380Ω -1 m -1 ;

[0048] (2) Mix the slag evenly and put it into a resistance furnace for baking. After baking at 600°C for 5 hours, turn off the power to let the slag cool down with the furnace, remove the moisture in the slag, and set aside;

[0049] Step 2, preparatory work:

[0050] (1) Determine the filling ratio and the insertion de...

Embodiment 2

[0059] A method for electroslag remelting of a conductive mold to control the direction of solidification structure of an ingot. The schematic diagram of electroslag remelting is as follows figure 1 As shown, the selected steel type is cold work die steel D2, which specifically includes the following steps:

[0060] Step 1, preparation and baking of slag:

[0061] (1) Prepare 140Kg of high-conductivity slag; wherein, the slag contains components and their mass percentages: CaF 2 : 50~70%, CaO: 10~20%, Al 2 o 3 : 20-30%, SiO 2 : ≤10%, the sum of the mass percentages of each component is 100%, and the conductivity of the slag system at 1900K is 460Ω -1 m -1 ;

[0062] (2) Mix the slag evenly and put it into a resistance furnace for baking. After baking at 600°C for 5 hours, turn off the power to let the slag cool down with the furnace, remove the moisture in the slag, and set aside;

[0063] Step 2, preparatory work:

[0064] (1) Determine the filling ratio and the inser...

Embodiment 3

[0073] A method for electroslag remelting of a conductive mold to control the direction of solidification structure of an ingot. The schematic diagram of electroslag remelting is as follows figure 1 As shown, the selected steel type is D2 steel, which specifically includes the following steps:

[0074] Step 1, preparation and baking of slag:

[0075] (1) Prepare 140Kg of high-conductivity slag; wherein, the slag contains components and their mass percentages: CaF 2 : 50~70%, CaO: 10~20%, Al 2 o 3 : 20-30%, SiO 2 : ≤10%; the sum of the mass percentages of each component is 100%, and the conductivity of the slag system at 1900K is 460Ω -1 m -1 ;

[0076] (2) Mix the slag evenly and put it into a resistance furnace for baking. After baking at 600°C for 5 hours, turn off the power to let the slag cool down with the furnace, remove the moisture in the slag, and set aside;

[0077] Step 2, preparatory work:

[0078] (1) Determine the filling ratio and the insertion depth of ...

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Abstract

The invention discloses a method for controlling the direction of a solidification structure of a cast ingot through electricity conductive crystallizer electroslag remelting and belongs to the technical field of metallurgy. The method comprises the steps that (1) a slag material with the high conductivity is prepared and then baked; (2) the filling rate and the insertion depth of an electrode are determined, and a base wad, an arc striking agent and an electricity conductive crystallizer are right placed; and (3) a path of an electric current flowing through a power source, the consumable electrode, the slag material, a bottom water tank and the power source is selected, and arc striking, material charging and slag melting are conducted; after the slag material is melted down, a remelting electric current and the remelting voltage are set; the path of the electric current is set through closing of a switch in the electroslag remelting process, the distribution ratio of electric currents flowing through the crystallizer and the bottom water tank is controlled, the shape and the depth of a metallic molten pool are changed, and the direction of the solidification structure is controlled; and in the later period of remelting, electricity is cut off after electroslag remelting feeding operation, cooling is conducted, and the remelted cast ingot is obtained. According to the method for controlling the direction of the solidification structure of the cast ingot through electricity conductive crystallizer electroslag remelting, a slag system with the high conductivity distribution ratio is adopted, and the tendency of axial crystallization of the solidification structure of the cast ingot is improved; and the crystallization direction of the solidification structure of the cast ingot is controlled in the remelting process, and the prepared cast ingot has good surface quality.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for controlling the solidification structure direction of an ingot by electroslag remelting of a conductive crystallizer. Background technique [0002] The liquid metal solidifies in a mold or mold, the former forming an ingot and the latter forming a casting. Due to the extremely complex cooling conditions of ingots or castings, the as-cast structure has many characteristics. The as-cast structure includes the size, shape and orientation of grains, the distribution of alloying elements, and defects in the ingot. The macrostructure of the ingot usually consists of three crystal regions, namely the chilled layer on the outer layer, the columnar crystal region in the middle and the equiaxed crystal region in the center. When the high-temperature metal liquid enters the mold, due to the low surface temperature of the mold, a large degree of supercooling is formed, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/12C22B9/18
CPCB22D7/12C22B9/18
Inventor 刘福斌姜周华余嘉耿鑫李花兵李星陈奎彭辉张宇
Owner NORTHEASTERN UNIV
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