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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
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  • 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 rate. In addition, in order to obtain a uniform and refined directional solidification structure, the drawing speed is greatly reduced. Production The problem of inefficiency is difficult to solve

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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

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specific Embodiment approach 1

[0014] Specific implementation mode one: the work process of this embodiment mode 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 horizontally connected and stably fixed on the ground with anchor bolts 6-1; there are two groups of circulating water channels 7 at the inner bottom of the furnace body 4, and the circulating water Channel 7 communicates furnace body 4 with water pipe 8, and the other end of water pipe 8 communicates with water-cooled copper type 2, thereby the waterway of furnace body is communicated with the waterway of water-cooled copper type; through the connection of copper pipe 8 and circulating water channel 7, also It can support the water-cooled copper mold 2; the internal water-cooled crystallizer 9 is fixed at the center of the bottom of the furnace body 4 by welding, and its bottom extends to the outside of the furnace body 4 to provide a forced solidification for the directio...

specific Embodiment approach 2

[0017] Specific Embodiment Two: This embodiment is to adopt the method of the present invention to implement the directional solidification process on titanium-based alloys. The alloy composition is Ti-6wt%Al-4wt%V. This is a general-purpose titanium alloy, which accounts for the current industrial titanium alloy usage. More than 90% of the alloy was directional solidified under the conditions of speed 1mm / min and power 48KW. After longitudinal planing of the obtained sample, after grinding and corrosion, there were three large columnar grains on the entire planing surface, and the solidification interface For the plane interface, directional solidification tissue 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%.

specific Embodiment approach 3

[0018] Specific Embodiment Three: This embodiment is to use the method of the present invention to implement a directional solidification process on another titanium-based alloy. The alloy composition is Ti-36wt% Al alloy, which is a titanium-based intermetallic compound material containing a high amount of aluminum. , which is a new type of light-weight high-temperature-resistant structural material, has broad 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 of this compound material can also be obtained. The solidification structure shows that the directional solidification structure with solidification characteristics can be obtained under the condition of low discharge speed. The tensile strength is increased from 245MPa as cast to 287MPa, and the elongation is 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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