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Method and device for reducing solidification defects of EB furnace smelting titanium and titanium alloy slab ingot

A titanium alloy and flat ingot technology, applied in the field of smelting, can solve problems such as shrinkage cavity shrinkage and ingot cracking, and achieve the effect of reducing material, reducing shrinkage cavity shrinkage, and reasonable structure

Pending Publication Date: 2019-03-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for reducing the solidification defects of titanium and titanium alloy flat ingots smelted in EB furnaces in view of defects such as cracks and shrinkage cavities in ingots solidified by existing crystallizers: During the solidification process, different cooling conditions and inner wall angles are used in different temperature ranges, that is, the cooling rate corresponding to the metal liquid phase zone, semi-solid zone, high-temperature solid phase zone, and low-temperature solid phase zone is gradually reduced, and the inner wall angle is gradually reduced. Water spray cooling after exiting the crystallizer

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  • Method and device for reducing solidification defects of EB furnace smelting titanium and titanium alloy slab ingot
  • Method and device for reducing solidification defects of EB furnace smelting titanium and titanium alloy slab ingot
  • Method and device for reducing solidification defects of EB furnace smelting titanium and titanium alloy slab ingot

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Embodiment 1

[0030] This embodiment takes the process of smelting large-scale TC4 slabs in an EB furnace as an example for illustration. The electron beam cooling hearth furnace used in this embodiment is a large EB furnace produced by RETECH Corporation of the United States. The total power is 3200kW, and there are 4 electron guns in total. process such as figure 2 shown.

[0031] The crystallizer used is the crystallizer designed by the present invention, and the cooling system on the side wall of the crystallizer is divided into four cooling sections, and corresponds to different cooling systems, from top to bottom are the first cooling system and the second cooling system , three-cooling system, four-cooling system, the position of the first cooling system corresponds to the liquid phase region of the metal in the crystallizer, the position of the second cooling system corresponds to the semi-solid region of the metal, the position of the third cooling system corresponds to the high-t...

Embodiment 2

[0041] This embodiment takes the process of smelting a large-scale TA1 slab in an EB furnace as an example to illustrate. The electron beam cooling hearth furnace used in this embodiment is a large EB furnace produced by RETECH Company of the United States, with a total power of 3200kW and 4 electron guns in total. process such as figure 2 shown.

[0042] The crystallizer structure that present embodiment uses is identical with embodiment 1, and difference is:

[0043] In this embodiment, the depth of cavity I9 is ​​30 mm, and the top of cavity I9 is ​​flush with the overflow port; the depth of cavity II10 is 200 mm; the depth of cavity III11 is 150 mm; the depth of cavity IV12 is 50 mm.

[0044] The angle between the inner wall of the crystallizer corresponding to the position of the first cooling system and the horizontal direction is 92°, the angle between the inner wall of the crystallizer corresponding to the position of the second cooling system and the horizontal dire...

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Abstract

The invention discloses a method and a device for reducing solidification defects of an EB furnace smelting titanium and titanium alloy slab ingot, and belongs to the technical field of smelting. Thecrystallizer is divided into four cooling zones by changing the structures of a crystallizer inner wall and a cooling system, the inner wall adopts different conicity and is provided with different cooling systems, the position of the cooling system corresponds to the metal liquid phase region in the crystallizer, the position of a secondary cooling system corresponds to the semi-solid state of the metal, the position of a three-cooling system corresponds to the high-temperature solid-phase area of the metal, the position of a four-cooling system corresponds to the low-temperature solid-phaseregion of the metal, and the four cooling systems jointly form a cooling system of the crystallizer. Different cooling conditions and inner walls with different conicity are adopted in different temperature intervals, the solid-liquid two-phase interval is reduced, so that the defects of cracks, shrinkage porosity and the like in the solidification process of continuous casting of the large-specification titanium alloy slab ingot are reduced, the compactness of the tissue is improved, the material milled on the surface of the slab ingot is reduced, the casting cost of the titanium alloy is reduced, the high-quality and low-cost titanium alloy cast ingot is obtained, and the enterprise benefits are improved.

Description

technical field [0001] The invention discloses a method and a device for reducing solidification defects of titanium and titanium alloy slabs smelted in an EB furnace, belonging to the technical field of smelting. Background technique [0002] Electron beam cold hearth furnace (EB furnace) smelting is an advanced metal smelting technology, which can effectively remove impurities in the smelting process, improve smelting quality, and use more extensive raw materials. After one smelting, qualified ingots can be obtained, greatly reduce manufacturing cost. In the process of smelting large-scale ingots in EB furnace, the molten metal drops into the cooling bed, after being refined, it slowly flows into the water-cooled crystallizer with ingot pulling device, and continuously solidifies into ingots from bottom to top, and the ingot pulling mechanism Slowly pull the ingot out of the crucible. [0003] figure 1 Shown is a schematic diagram of the solid-liquid interface morpholog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/193C22B34/12C22C1/02
CPCC22B9/18C22B34/1295C22C1/02
Inventor 肖寒谭聪黄海广周荣锋蒋业华
Owner KUNMING UNIV OF SCI & TECH