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A method for controlling the melting superheat degree of pouring tial alloy in a water-cooled crucible

A water-cooled crucible and superheating technology, which is applied in metal processing equipment, casting melt containers, manufacturing tools, etc., to improve casting yield, reduce shrinkage cavity and shrinkage defects, and ensure accuracy

Active Publication Date: 2020-01-07
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for regulating the melting superheat of TiAl alloy poured in a water-cooled crucible, so as to solve the problems in the prior art mentioned above. The superheat of the body makes the melt poured later not lower than the melt poured first, thereby significantly improving the feeding ability of the riser to the casting, reducing the shrinkage cavity and porosity defects of TiAl alloy castings, and improving the casting yield of TiAl

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  • A method for controlling the melting superheat degree of pouring tial alloy in a water-cooled crucible

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Embodiment 1

[0042] Taking a turbine with a diameter of 160 mm poured from a TiAl melt in a water-cooled crucible as an example, the characteristic parameters of the tundish used in the present invention are:

[0043] (1) The weight of the master alloy in the water-cooled crucible is 5kg, the capacity of the main body 1 of the tundish is 6kg, the maximum outer diameter is 170mm, the height is 200mm, the diameter of the material storage area is 150mm, the diameter of the feed port is 80mm, and the section slope of the confluence area is 45°. The diameter of the liquid outlet 5 is 40mm, and the length of the liquid outlet 5 is 30mm;

[0044] (2) The main body 1 of the tundish is made of ceramics with yttrium oxide as the surface layer and alumina as the back layer support. The purity of yttrium oxide is 99.92%, the bending strength of the ceramic is 5MPa, and the heat storage coefficient is 6800J·s -0.5 m -2 ·K -1 , the thermal conductivity is 7.2W·m -1 ·K -1 ;

[0045] (3) The thicknes...

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Abstract

The invention discloses a method for regulating melting superheat of a TiAl alloy casted in a water-cooled crucible. The method includes a tundish arranged between the water-cooled crucible and a casting mold. The tundish includes a tundish main body, a ceramic tray and induction heating coils. A liquid outlet of the water-cooled crucible is connected to a top opening of the tundish main body. Theceramic tray is mounted at a bottom liquid outlet of the tundish main body. A seal is arranged at the ceramic tray. The induction heating coils connected to a power supply are correspondingly arranged on the outer side of the tundish main body. The method for regulating melting superheat of the TiAl alloy casted in the water-cooled crucible regulates melt superheat without contaminating a TiAl melt and losing melt heat so as to make the superheat of the later casted melt is not lower than that of the first casted melt, thereby significantly improving the feeding capacity of a riser to castings, reducing the shrinkage porosity defect of the TiAl alloy castings, and improving the casting yield of TiAl.

Description

technical field [0001] The invention relates to the technical field of metal casting, in particular to a method for controlling the melting superheat degree of pouring TiAl alloy in a water-cooled crucible. Background technique [0002] TiAl melt has high chemical activity and reacts with almost all oxide ceramics, so using oxide ceramic crucibles for TiAl alloy melting will pollute TiAl melt. The water-cooled crucible can form a layer of alloy solidification shell on the crucible wall, so as to avoid the contact between the crucible wall and the alloy melt, and ensure the purity of the melt. It is the main crucible for melting TiAl alloy. [0003] When smelting TiAl alloy in a water-cooled crucible, the melt is in a suspended state, and only the bottom melt is in contact with the cold crucible. Since the water cooling system in the water-cooled crucible will reduce the heat of the melt that is in contact with the crucible, the temperature of the melt in the water-cooled cru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/01B22D41/02B22D41/48
CPCB22D41/01B22D41/02B22D41/48
Inventor 胡海涛张继朱春雷李胜王红卫张熹雯
Owner CENT IRON & STEEL RES INST
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