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An optimized process for reducing reaction between directionally solidified titanium-aluminum alloy castings and mold coating

A technology of directional solidification and titanium-aluminum alloy, which is applied in self-solidification, chemical instruments and methods, crystal growth, etc., can solve problems such as low drawing rate, improve surface quality and dimensional accuracy, reduce internal pollutants, and interface good response

Active Publication Date: 2018-04-03
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the pulling rate increases, the number of grains increases, and the deviation between the grain direction and the axial direction increases. To obtain a small number of grains and a small included angle, a lower pulling rate must be used.

Method used

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  • An optimized process for reducing reaction between directionally solidified titanium-aluminum alloy castings and mold coating
  • An optimized process for reducing reaction between directionally solidified titanium-aluminum alloy castings and mold coating
  • An optimized process for reducing reaction between directionally solidified titanium-aluminum alloy castings and mold coating

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Embodiment Construction

[0018] An optimized process for reducing reaction of directionally solidified titanium-aluminum alloy castings with mold coatings.

[0019] (1) The sample is smelted, and the master ingot for the test is prepared in a vacuum induction melting furnace. The alloy composition is shown in Table 1. Before heating, preheat the graphite mold to 200°C and keep it warm for 1 hour. After the heating is completed, quickly cool the cast state and take samples;

[0020] (2) A round bar with a diameter of 6 mm and a length of 100 mm was cut from the above alloy ingot as a directional solidified sample. Grind the surface scale, ultrasonically clean with acetone and dry at 120°C for one hour;

[0021] (3) Put the sample into Al 2 o 3 (Inner diameter is 6mm, outer diameter is 8mm) in the casting mold, fixed in the directional solidification furnace, close the equipment and start vacuuming, the vacuum degree of the furnace chamber is required to reach 5×10 -3 Pa, when heated to 500°C, argon...

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Abstract

The invention researches a process for reducing the reaction of directional solidification titanium-aluminum alloy castings and casting mold coatings, and belongs to a directional solidification casting method of a high-temperature structural alloy. The invention aims at providing optimal process parameters during titanium-aluminum alloy preparation achieved through directional solidification, the interface reaction between an alloy melt and casting mold materials is weakened to be minimum when the heat preservation time is 30 minutes and the drawing speed is 60 micrometers per second by means of design of directional solidification parameters of a Ti-48Al-7Nb-2.5V-1.0Cr alloy, the reaction layer thickness is reduced to be less than 10 micrometers, the surfaces of the castings are smooth, and internal contamination is little. The process is characterized in that the time of contact between the melt and casting molds is shortened, and the problems that when the drawing speed is high, the number of crystalline grains is increased and the deviation between the direction of the crystalline grains and the axial direction is large are solved. The process is reasonable and low in cost, can not influence the directional solidification structure orientation of a titanium-aluminum alloy, and can be applied to the directional solidification process of the titanium-aluminum alloy.

Description

technical field [0001] The invention relates to an optimization for reducing the reaction between a directional solidified titanium-aluminum alloy casting and a mold coating, which belongs to an interface reaction optimization process for a high-temperature structural alloy. Background technique [0002] As a light-weight high-temperature structural material, titanium-aluminum alloy not only has low density, high specific strength, and high elastic modulus, but also has good high-temperature oxidation resistance and creep resistance. It is one of the research hotspots of engine materials. , biomedicine and automobile manufacturing and other fields have been widely used. Made of TiAl (γ phase) and a small amount of Ti 3 Al(α 2 phase) has better mechanical properties than other forms of tissue, and obviously presents anisotropy. When the applied load is consistent with the lamellar direction, the yield strength, elongation, fracture toughness and The creep performance has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C21/00C30B29/52C30B11/00
CPCC22C21/00C22C30/00C30B11/00C30B29/52
Inventor 隋艳伟程成冯坤戚继球何业增委福祥孟庆坤孙智
Owner CHINA UNIV OF MINING & TECH
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