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Liquid state hydrogen-replacing method for smelting Ti-6Al-4V alloy

A technology for hydrogenation and alloying, which is applied in the field of hydrogenation, can solve the problems such as ingots that cannot be filled with large volume of hydrogen.

Inactive Publication Date: 2008-07-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the current solid-state hydrogen storage technology for titanium alloys is only applicable to thin-walled components and cannot carry out hydrogen storage for large-volume ingots, and to provide a method for melting Ti6Al4V alloys with liquid hydrogen storage

Method used

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  • Liquid state hydrogen-replacing method for smelting Ti-6Al-4V alloy
  • Liquid state hydrogen-replacing method for smelting Ti-6Al-4V alloy
  • Liquid state hydrogen-replacing method for smelting Ti-6Al-4V alloy

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specific Embodiment approach 1

[0012] Specific Embodiment 1: The method for smelting Ti6Al4V alloy in liquid state in this embodiment is realized by the following steps: Put the Ti6Al4V alloy or Ti6Al4V alloy raw material into the water-cooled copper crucible in the melting chamber, and then evacuate the melting chamber to a vacuum degree 5.0×10 -3 Pa~7.0×10 -3 Pa; then pass in argon gas with a purity of 99.999% to empty the air in the gas circuit system outside the smelting chamber; then fill a certain amount of argon gas into the smelting chamber through the gas circuit system, and then pass in a certain amount of hydrogen gas, specifically The ratio of hydrogen to argon can be controlled during operation, and the liquid state hydrogenated Ti6Al4V alloy is obtained by smelting with hydrogen for 2 minutes to 4 minutes; the mass of hydrogen added to the titanium alloy during hydrogen smelting is calculated by the following formula:

[0013] Δ P H ...

specific Embodiment approach 2

[0017] Embodiment 2: This embodiment is different from Embodiment 1 in that the current is kept at 80-150A during the smelting process. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Embodiment 3: This embodiment is different from Embodiment 1 in that the current is kept at 90-120A during the smelting process. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method of melting the Ti6Al4V alloy through the hydrogenation at liquid state, relating to the hydrogenation method during melting casting the Ti6Al4V alloy ingot, solving the problem that the hydrogenation technique at solid state of the titanium alloy is only suitable for the thin-walled members, but can not carry out the hydrogenation for big volume ingot. The melting method is characterized in that: the Ti6Al4V alloy or the alloy material is put into a working chamber; then the working chamber is carried out vacuum pumping; the argon is pumped in the working chamber, so as to enable the air in the air pressure system outside the working chamber to be emptied; the argon and the hydrogen mixed according to certain proportion are pumped in the working chamber through the gas path system; and the hydrogenation melting is carried out when the melting current is 80 to 150 A, so as to obtain the Ti6Al4V alloy after the hydrogenation at liquid state. The method of melting the Ti6Al4V alloy through the hydrogenation at liquid state has the advantages that: the microstructure of the Ti6Al4V alloy after the hydrogenation at liquid state is thinned; the hot workability is improved; the problem that the hydrogenation at solid state is difficult to apply to lager ingot hydrogenation is radically solved; and the content of the hydrogen added in the alloy can be more accurately controlled, so as to apply to mass and continuous production with practical significance.

Description

technical field [0001] The invention relates to a method for putting hydrogen in the process of melting and casting Ti6Al4V alloy ingots. Background technique [0002] Titanium-based alloys have the characteristics of low density, high specific strength, good corrosion resistance and high thermal strength. They are ideal structural materials for aerospace vehicles and are widely used. However, it has some disadvantages in the processing process: titanium alloy has low plasticity at room temperature, low deformation limit, large deformation resistance, and easy to crack when cold forming; high thermal deformation temperature of titanium alloy, large flow stress, low atomic diffusion ability at high temperature, and strain rate inferior. In order to solve such problems, in recent years, solid-state hydrogen storage technology for titanium alloys has emerged to improve the processing performance of alloys. Studies have shown that adding an appropriate amount of hydrogen to tit...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22F1/18
Inventor 苏彦庆王亮郭景杰吴士平丁宏升傅恒志
Owner HARBIN INST OF TECH
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