Water cooling electromagnetic copper type directional solidification method of titanium base alloy

A directional solidification, titanium-based alloy technology, applied in the field of directional solidification of metals, can solve problems such as low production efficiency, reduced drawing speed, and difficult to obtain cooling rate

Inactive Publication Date: 2005-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in traditional directional solidification, since the cooling rate of the specimen is limited by the heat transfer rate at the solid phase end, it is difficult to obtain a uniform cooling

Method used

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  • Water cooling electromagnetic copper type directional solidification method of titanium base alloy
  • Water cooling electromagnetic copper type directional solidification method of titanium base alloy
  • Water cooling electromagnetic copper type directional solidification method of titanium base alloy

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Embodiment 1: The working process of this embodiment is as follows: refer to figure 1, the furnace body 4 is installed on the support frame 6 by bolts, and the support frame 6 is stably fixed on the ground by connecting with anchor bolts 6-1 horizontally; The channel 7 connects the furnace body 4 with the water pipe 8, and the other end of the water pipe 8 is communicated with the water-cooled copper mold 2, thereby connecting the waterway of the furnace body with the waterway of the water-cooled copper mold; It can play a supporting role for the water-cooled copper type 2; the internal water-cooled crystallizer 9 is fixed at the bottom center position of the furnace body 4 by welding, and its bottom extends to the outside of the furnace body 4 to provide mandatory directional solidification. The cooling effect is realized by the low melting point alloy cooling liquid 10 contained in the inner, the low melting point alloy cooling liquid 10 is a binary alloy liquid or a ...

Example Embodiment

[0017] Specific embodiment 2: This embodiment is to use the method of the present invention to implement a directional solidification process for titanium-based alloys. The alloy composition is Ti-6wt%Al-4wt%V, which is a general titanium alloy, accounting for the current industrial titanium alloy usage. More than 90% of the alloy was subjected to directional solidification at a speed of 1mm / min and a power of 48KW. The obtained sample was longitudinally planed. After grinding and corrosion, the entire planed surface had three large columnar grains. The solidification interface For a flat interface, a directional solidification structure can be obtained. The tensile strength of the alloy after directional solidification does not change much, and the elongation increases from 8.2% to 12.7%.

Example Embodiment

[0018] Specific embodiment 3: This embodiment is to use the method of the present invention to perform a directional solidification process on another titanium-based alloy. The alloy composition is a Ti-36wt% Al alloy, which is a titanium-based intermetallic compound material containing high content of aluminum. , belongs to a new type of lightweight high-temperature resistant structural material, which has a wide range of application prospects in high-temperature components such as aero-engines. When the pulling speed is 0.2mm / min and the power is 48KW, directional solidification is performed on this compound material, and directional solidification can also be obtained. Solidification structure, indicating that in the case of low discharge rate, directional solidification structure with solidification characteristics can be obtained. The tensile strength increased from as-cast 245MPa to 287MPa, and the elongation increased from 0.1% to 0.35%.

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Abstract

A water cooled electromagnetic directional solidifying method for Ti-based alloy features that the furnace containing crucible is vacuumized, and after the single-phase AC is applied to the coil for 4-16 min, the upper material rod and bottom material are moved downward to make the bottom material come in crystallier, resulting in uniform cooling speed and high mechanical performance of product.

Description

Technical field: [0001] The invention relates to a metal directional solidification method. Background technique: [0002] Directional solidification is a process in which metals (or crystalline materials) can solidify or crystallize along a fixed growth direction under the conditions of controlling heat transfer, mass transfer and flow inside the casting. The microstructure of metals after directional solidification is characterized by a group of parallel columnar grains parallel to the direction of solidification heat flow. If the growth process of grains can be properly controlled, such as inhibiting external nucleation, the crystals can grow into a crystalline structure with only one grain, called as a single crystal. It can be seen that directional solidification is a special material processing technology under the basic conditions of one-way heat and mass transfer. The current development of this restrictive solidification technology, on the one hand, provides stron...

Claims

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Application Information

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IPC IPC(8): B22D11/049
Inventor 丁宏升陈瑞润毕维生郭景杰贾均傅恒志苏彦庆
Owner HARBIN INST OF TECH
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