Method for preparing TC4 titanium alloy ingot casting through electron beam cold bed hearth smelting

An electron beam cooling hearth furnace and titanium alloy technology, which is applied in the field of titanium alloy ingot preparation, can solve the problems of large volatilization and difficult control of volatile alloy elements, and achieve the effects of reduced volatilization rate, easy breakage and improved utilization rate

Inactive Publication Date: 2013-02-06
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electron beam cooling bed melting requires vacuum (about 10 -3 Pa to 10 -2 Pa) environment, can effectively remove the gas elements and volatile elements in the alloy, improve the purity of the ingot, but also cause difficulty in the control of volatile alloy elements (mainly Al, Cr elements), and the volatilization amount is very large

Method used

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  • Method for preparing TC4 titanium alloy ingot casting through electron beam cold bed hearth smelting
  • Method for preparing TC4 titanium alloy ingot casting through electron beam cold bed hearth smelting
  • Method for preparing TC4 titanium alloy ingot casting through electron beam cold bed hearth smelting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1. Mix 0-grade titanium sponge and aluminum beans (mass purity: 99.6%) according to the mass ratio of 57:43, and then use a 500T hydraulic press to press it into an electrode block with a size of Φ50mm×300mm under the condition of a pressure not greater than 15MPa. Then, the four electrode blocks are welded by argon arc welding under the protection of argon gas, and the welding current is 300A. , under the condition that the smelting vacuum degree is not more than 14Pa, the smelting current is 1700A, and the smelting voltage is 30V, a brittle and easily broken Ti-Al master alloy is obtained by one smelting; the mass of Al in the aluminum bean is about the Ti-Al intermediate 1.02 times of Al quality in the alloy; The chemical composition of described Ti-Al master alloy is as shown in table 1:

[0024] Table 1 Chemical composition of Ti-Al master alloy

[0025]

[0026] Step 2, using a jaw crusher to crush the Ti-Al master alloy described in Step 1 into Ti-Al mas...

Embodiment 2

[0033]Step 1. Mix the grade 1 sponge titanium and aluminum beans (mass purity 99.8%) according to the mass ratio of 58:42, and then use a 500T hydraulic press to press it into an electrode block with a size of Φ50mm×300mm under the condition of a pressure not greater than 15MPa. Then, the three electrode blocks are welded by argon arc welding under the protection of argon gas and the welding current is 350A to form electrodes with a size of Φ50mm×900mm, and then the electrodes are placed in a 50kg vacuum consumable electric arc furnace , under the conditions that the smelting vacuum degree is not greater than 14Pa, the smelting current is 1600A, and the smelting voltage is 29V, a brittle and easily broken Ti-Al master alloy is obtained by one smelting; the quality of Al in the aluminum bean is Ti-Al master alloy 1.03 times of Al quality in the middle; The chemical composition of described Ti-Al master alloy is as shown in table 3:

[0034] Table 3 Chemical composition of Ti-Al...

Embodiment 3

[0043] Step 1. Mix 0-grade titanium sponge and aluminum beans (mass purity 99.6%) according to the mass ratio of 59:41, and then use a 500T hydraulic press to press it into an electrode block with a size of Φ50mm×300mm under the condition of a pressure not greater than 15MPa. Then, the four electrode blocks were welded into electrodes with a size of Φ50mm×1200mm under the protection of argon gas by argon arc welding and the welding current was 250A, and then the electrodes were placed in a vacuum consumable arc furnace. Under the condition that the smelting vacuum degree is not more than 14Pa, the smelting current is 1800A, and the smelting voltage is 30V, a brittle and easily broken Ti-Al master alloy is obtained by one smelting; 1.016 times of Al quality; The chemical composition of described Ti-Al master alloy is as shown in table 5:

[0044] Table 5 Chemical composition of Ti-Al master alloy

[0045]

[0046] Step 2, using a jaw crusher to crush the Ti-Al master alloy ...

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Abstract

The invention discloses a method for preparing TC4 titanium alloy ingot casting through electron beam cold bed hearth smelting. The method comprises steps as follows: 1, uniformly mixing sponge titanium and aluminum shot, pressing to obtain electrode slabs, and welding to obtain an electrode, then transferring into a vacuum consumable electro-arc furnace to smelt once to obtain Ti-Al intermediate alloy; 2, crushing the Ti-Al intermediate alloy to obtain Ti-Al intermediate alloy particles; and 3, uniformly mixing the sponge titanium, the Al-V intermediate alloy and the Ti-Al intermediate alloy particles, pressing to obtain electrode slabs, and splicing the electrode slabs to obtain the electrode, and then transferring into an electron beam cold bed hearth to smelt once to obtain the TC4 titanium alloy ingot casting. According to the method, the Ti-Al intermediate alloy is used for replacing the aluminum shot, so that volatilization of an Al element is reduced, utilization rates of raw materials are improved, and service efficiency of the electron beam cold bed hearth is improved; the method has stronger advantages of reducing processing cost of a titanium material and improving production efficiency, because the electron beam cold bed hearth is adopted for one-time smelting; and cleanliness of the titanium alloy ingot casting can be improved, so that a high-quality ingot casting can be obtained.

Description

technical field [0001] The invention belongs to the technical field of preparation of titanium alloy ingots, and in particular relates to a method for preparing TC4 titanium alloy ingots by smelting in an electron beam cooling bed furnace. Background technique [0002] Ti-6Al-4V and Ti-6242S are the most widely used titanium alloys in engines. The traditional smelting technology of titanium alloys for aircraft engines is three-time vacuum consumable arc smelting, which can homogenize the chemical composition and reduce segregation and inclusions in the ingot. However, due to the inherent characteristics of the sponge titanium production process and the inherent defects of the vacuum consumable arc melting process, there are occasional inclusion metallurgical defects in the titanium alloy ingot produced by this process. [0003] In order to solve this technical problem, in the late 1980s, consumable smelting combined with cooling bed smelting technology was adopted internati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03
Inventor 于兰兰毛小南雷文光侯智敏张英明罗雷赵永庆张鹏省
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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