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A method for controlling the solidification structure direction of ingot by electroslag remelting of conductive mold

A technology of solidification structure and electroslag remelting, which is applied in the field of metallurgy, can solve problems such as difficult flexible control and fixed direction of ingot solidification structure, and achieve the effects of reducing melting speed, ensuring surface quality, and improving slag melting efficiency

Active Publication Date: 2018-07-10
NORTHEASTERN UNIV LIAONING
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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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  • A method for controlling the solidification structure direction of ingot by electroslag remelting of conductive mold
  • A method for controlling the solidification structure direction of ingot by electroslag remelting of conductive mold

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

A method for controlling the direction of the solidification structure of an ingot by electroslag remelting in a conductive crystallizer, belonging to the field of metallurgical technology. Method: 1) Prepare high conductivity slag and then bake it; 2) Determine the filling ratio and electrode insertion depth; place the bottom pad, arc starting agent and conductive crystallizer; 3) Select the current path as power supply → self-consumption power Pole → slag material → bottom water tank → power supply, arc starting, feeding, and slag removal; after the slag material is melted, the remelting current and remelting voltage are set. During the electroslag remelting process, the current path is set by closing the switch. Control the distribution ratio of current through the crystallizer and bottom water tank, change the shape and depth of the metal molten pool, and control the direction of the solidification structure; in the later stage of remelting, the power is cut off after the electroslag remelting and feeding operation, and the remelted steel ingot is cooled. The method of the present invention uses a slag system with a high conductivity ratio to increase the tendency of axial crystallization of the solidified structure of the ingot; during the remelting process, the crystallization direction of the solidified structure of the ingot is controlled, and the prepared 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 Patents(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 LIAONING
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