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Method for improving uniformity of Al element in TC4 titanium alloy

A technology of uniform elements and titanium alloys is applied in the field of improving the uniformity of Al elements in TC4 titanium alloys, which can solve the problems of segregation of alloy elements, limiting the application of TC4 alloys, and low waste utilization rate.

Active Publication Date: 2018-07-03
QINGHAI JUNENG TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, TC4 titanium alloy is mainly prepared by vacuum consumable electric arc furnace (VAR) smelting method, but metallurgical defects such as segregation of alloy elements, oxidized inclusions and impurities, loose shrinkage cavities and other metallurgical defects often occur in TC4 ingots in VAR furnace, which need to be smelted two or three times. Obtain ingots with qualified components, and the utilization rate of waste is extremely low, which greatly limits the application of TC4 alloy

Method used

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  • Method for improving uniformity of Al element in TC4 titanium alloy
  • Method for improving uniformity of Al element in TC4 titanium alloy
  • Method for improving uniformity of Al element in TC4 titanium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1, the influence of the preparation of raw materials on the homogeneity of TC4 titanium alloy melted in one-time electron beam cooling hearth furnace

[0038] 1. Preparation of raw materials

[0039] The main factors affecting the uniformity of the chemical composition of the ingot tail are: the amount of alloying elements in the head discharge and the process parameters in the stage of starting the electron gun and the stage of making the bottom of the ingot. Let's consider the amount of ingredients first. In the stage of starting the electron gun, due to the unstable working conditions and the low melting speed at the end of the smelting stage, these all lead to a long time for the volatilization of Al elements to a large extent, and finally lead to a relatively low volatilization rate of Al elements. Large, the content at the tail of the ingot is low or even lower than the international standard, and the overall distribution of Al elements in the ingot is une...

Embodiment 2

[0073] Example 2, the influence of smelting process on the homogeneity of TC4 titanium alloy smelted in one-time electron beam cooling hearth furnace

[0074] The 3150KWB BMO-01 electron beam cooling hearth furnace uses a cold cathode electron gun. Since the cold cathode electron gun does not have a separate vacuum system, the inside of the entire gun body communicates with the melting chamber, and the gun body obtains vacuum through the melting chamber. When the vacuum degree of the smelting chamber reaches the requirement, the high-voltage power supply of the electron gun is turned on, and the working gas is introduced to start the electron gun. Hydrogen enters the gas ionization area of ​​the electron gun shell from the inlet nozzle, and the gas is ionized under vacuum and high pressure conditions to generate H + , since the positive pole of the high voltage electron gun is connected to the anode, and the negative pole is connected to the cathode, so the ionized H + Under ...

Embodiment 3

[0096] Example 3, the influence of smelting process on the uniformity of TC4 titanium alloy smelted in one-time electron beam cooling hearth furnace

[0097] The EB furnace smelting stage is the core link of EB furnace single smelting TC4 alloy, and it is the key link to control the volatilization of Al element. The volatilization of Al element is mainly related to the following two factors:

[0098] (1) Melting speed. If the smelting speed is too slow, it will take a long time to melt the entire ingot, and the time for Al volatilization will be long, and the volatilization rate will increase; if the smelting speed is too fast, the heat absorbed by the alloy liquid per unit time will increase, the volatilization speed of Al element will increase, and the volatilization rate will increase. The speed of smelting mainly depends on the total power of the 1~4# electron guns. When the smelting speed increases, the total feeding speed and the ingot pulling speed increase, and there i...

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Abstract

The invention relates to a method for improving the uniformity of the Al element in TC4 titanium alloy. The method comprises the following steps: (1) preparing materials, namely preparing raw materials containing Ti, Al and V metel elements, including primary discharge materials, normal materials and tailed discharge materials; (2) sequentially feeding the primary discharge materials, normal materials and tailed discharge materials into electron beam cold hearth melting, and melting, wherein the content of Al element in the primary discharge materials is higher than 0.3-0.7% which is the content of Al element in normal materials; and the content of Al element in the normal materials is 7.00-7.40%. The method can be used for remarkably improving the uniformity of chemical ingredients of head and tail parts of ingots, reducing the cutting amount of head and tail parts of the ingots, and integrally improving the uniformity and / or yield of TC4 titanium alloy.

Description

technical field [0001] The invention relates to a method for improving the uniformity of Al element in TC4 titanium alloy. Background technique [0002] At present, TC4 titanium alloy is mainly prepared by vacuum consumable electric arc furnace (VAR) smelting method, but metallurgical defects such as segregation of alloy elements, oxidized inclusions and impurities, loose shrinkage cavities and other metallurgical defects often occur in TC4 ingots in VAR furnace, which need to be smelted two or three times. The ingot with qualified composition is obtained, and the utilization rate of waste is extremely low, which greatly limits the application of TC4 alloy. However, using an electron beam cooling bed (EB) furnace to melt TC4 titanium alloys, low-density inclusions (LDI, that is, oxygen-rich or oxygen-rich hard α-phase inclusion defects that occasionally exist in titanium alloy ingots) and high-density inclusions (HDI, Such as Nb, Mo, WC, etc.) have a significant removal eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02
CPCC22C1/02C22C14/00
Inventor 张志斌周武杜彬王福清孙少云
Owner QINGHAI JUNENG TITANIUM IND CO LTD
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