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Method for controlling formation of foreign crystals at variable cross section

A technology of variable cross-section and miscellaneous crystals, applied in the field of superalloy microstructure and solidification, can solve the problems of reducing the mechanical properties of superalloys, limited effect of miscellaneous crystal suppression, low production efficiency, etc. The effect of miscellaneous crystal formation

Inactive Publication Date: 2016-03-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the sudden change in section of the superalloy blade at the blade body and blade edge, miscellaneous crystals are easily produced at the corners of the platform. Be a source of crack propagation that degrades the mechanical properties of superalloys at elevated temperatures
Regarding the elimination of miscellaneous crystals, a lot of research has been carried out at home and abroad. Reducing the pulling speed and increasing the temperature gradient can suppress the generation of miscellaneous crystals. However, reducing the pulling speed will lead to low production efficiency, and reducing the pulling speed and increasing the temperature gradient can inhibit the miscellaneous crystals. The effect is limited; Mr. Ma Dexin and others used the thermal conductor technology and the seeding bar technology to prepare single crystals, and achieved certain results, but the seeding bar technology is prone to produce small-angle grain boundaries
Therefore, finding a feasible method to suppress the formation of stray crystals is of great scientific significance for avoiding the formation of stray crystal defects in actual industrial production to obtain superalloy materials with excellent performance. not ideal

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  • Method for controlling formation of foreign crystals at variable cross section
  • Method for controlling formation of foreign crystals at variable cross section
  • Method for controlling formation of foreign crystals at variable cross section

Examples

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Embodiment 1

[0022] In this example, see Figure 1~3, a method for controlling the formation of miscellaneous crystals at variable cross-sections is implemented by using a device for controlling the formation of miscellaneous crystals at variable cross-sections. The device for controlling the formation of miscellaneous crystals at variable cross-sections includes a furnace body 1 and a heater 2. There is a fixed radiation baffle 6, which divides the inner cavity of the entire furnace body 1 into an upper heating zone and a lower cooling zone, and the casting system is pulled from the heating zone to the cooling zone so that the molten metal is processed from bottom to top. The directional solidification of the casting system includes the casting cavity base formwork 9, the spiral crystal selector 12 and the sprue 13 on the top of the formwork, and the casting cavity base formwork 9 forms a cylindrical casting cavity with vertically segmented and variable cross-sections. The liquid superall...

Embodiment 2

[0030] This embodiment is basically the same as Embodiment 1, especially in that:

[0031] In this example, the device for controlling the formation of miscellaneous crystals at the variable section in Example 1 is used to carry out directional solidification of variable section castings, increasing the size of the variable section to 15 mm, and the samples are variable section with lengths of 30 mm and 60 mm respectively. For castings, the temperature of the heater is 1500°C, the initial temperature of the water cooling ring 7 and the bottom water cooling plate 15 is 25°C, and the water cooling is continued, the initial temperature of the mold shell is 1500°C, the thickness of the mold shell is 6mm, and the initial temperature of the alloy melt is 1500°C , after pouring is completed, keep warm for a period of time until the temperature is basically constant, slowly pull the casting system and the bottom water-cooled plate 15 from the heating zone to the cooling zone at a pulli...

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Abstract

The invention discloses a method for controlling the formation of foreign crystals at a variable cross section. According to the method, by using a double-layer mould case method at the variable cross section, the formation of foreign crystals at the variable cross section can be feasibly and effectively inhibited, a monocrystal structure is obtained at a relatively higher pulling speed, and a high-temperature alloy casting with excellent mechanical properties is obtained. A variable-cross-section casting directional-solidification device in the invention comprises a heating system, a casting system and a water cooling system, wherein directional solidification can be realized from bottom to top by pulling the casting system from a heating zone to a cooling zone. The double layer mould case method has an excellent effect of inhibiting the formation of foreign crystals, and is of important directive significance in manufacturing blades in groups, obtaining monocrystal high-temperature alloy blades with excellent properties and improving the production efficiency.

Description

technical field [0001] The invention relates to a preparation technology of a high-temperature alloy, in particular to a method for controlling the formation of miscellaneous crystals during the directional solidification of a single-crystal high-temperature alloy, and is applied in the technical field of high-temperature alloy structure solidification. Background technique [0002] The development level of superalloys is an important indicator to measure the development level of aeroengines and industrial gas turbines. The development of superalloys has roughly experienced deformation superalloys, ordinary casting superalloys, directionally solidified superalloys and single crystal superalloys, especially single crystal superalloys. It can withstand relatively large complex stress under high temperature conditions, and has excellent high temperature light strength and creep resistance performance, so it has important research and development value. However, due to the sudde...

Claims

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Application Information

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IPC IPC(8): B22D27/04C30B11/00C30B29/52
CPCB22D27/045C30B11/00C30B29/52
Inventor 玄伟东李传涛谢信亮任忠鸣李传军任兴孚王宝军
Owner SHANGHAI UNIV
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