Preparation of Ti-6Al-4V titanium alloy large-sized casting ingot

A ti-6al-4v, titanium alloy technology, applied in the field of large ingot preparation of Ti-6Al-4V titanium alloy, can solve problems such as positive segregation, achieve stable solidification process, ensure the shape and depth of molten pool, and stabilize crystallization process Effect

Active Publication Date: 2009-07-08
BAOJI TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the distribution coefficient K<1 of the vanadium and aluminum elements contained in the Ti-6Al-4V titanium alloy, it has a positive segregation tendency

Method used

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  • Preparation of Ti-6Al-4V titanium alloy large-sized casting ingot
  • Preparation of Ti-6Al-4V titanium alloy large-sized casting ingot
  • Preparation of Ti-6Al-4V titanium alloy large-sized casting ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: (534-20071540 ingot, Φ940mm)

[0020] Step 1 mixing and electrode pressing: according to the composition of the Ti-6Al-4V alloy, select titanium sponge, use A-V as the intermediate alloy for mixing, and press the electrode block;

[0021] Step 2 Electrode preparation: use the vacuum plasma arc electrode group welding method to prepare the pressed electrode block to obtain a large consumable electrode, and the welding pre-vacuum is ≤ 10Pa;

[0022] Step 3: Vacuum consumable melting once, the crucible is Φ710mm, the melting current is controlled at 18-25KA, and the voltage is controlled at 33-35V;

[0023] Step 4 Secondary vacuum self-consumption smelting smelting, the crucible Φ820mm, the smelting current is controlled at 18-25KA, and the voltage is controlled at 33-35V;

[0024] Step 5 Vacuum consumable smelting of the finished product: crucible Φ940mm, using constant melting rate smelting process, the melting rate control parameter is: 20-23Kg / min; the onli...

Embodiment 2

[0029] Example 2 (534-20071991 ingot, Φ940mm)

[0030] Step 1 Mixing and electrode pressing: According to the composition of Ti-6Al-4V alloy, select sponge titanium, use A-V as the intermediate alloy for mixing, and press the electrode block;

[0031] Step 2 Electrode preparation: use the vacuum plasma arc electrode assembly welding method to prepare the pressed electrode block to obtain a large consumable electrode, and the welding pre-vacuum is ≤10Pa;

[0032] Step 3 One-time vacuum self-consumption melting and melting, the crucible is Φ710mm, the melting current is controlled at 23-30KA, and the voltage is controlled at 35-38V;

[0033] Step 4 Secondary vacuum consumable melting, crucible Φ820mm, melting current controlled at 23-30KA, voltage controlled at 35-38V;

[0034] Step 5 Vacuum self-consumption smelting of finished products: crucible Φ940mm, using constant melting rate smelting process, melting rate control parameters: 25-28Kg / min; online detection system detects ...

Embodiment 3

[0038] Example 3 (534-20080688 ingot, Φ1040mm)

[0039] Step 1 Mixing and electrode pressing: According to the composition of Ti-6Al-4V alloy, select sponge titanium, use A-V as the intermediate alloy for mixing, and press the electrode block;

[0040] Step 2 Electrode preparation: use the vacuum plasma arc electrode assembly welding method to prepare the pressed electrode block to obtain a large consumable electrode, and the welding pre-vacuum is ≤10Pa;

[0041] Step 3 One-time vacuum self-consumption melting, crucible Φ820mm, melting current controlled at 30-38KA, voltage controlled at 38-41V;

[0042] Step 4 Secondary vacuum self-consumption melting and melting, the crucible is Φ940mm, the melting current is controlled at 30-38KA, and the voltage is controlled at 38-41V;

[0043] Step 5 Vacuum self-consumption smelting of finished products: crucible Φ1040mm, using constant melting rate smelting process, melting rate control parameters: 29 ~ 32Kg / min; online detection syste...

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Abstract

The invention relates to a large-scale ingot casting method for preparing Ti-6Al-4V titanium alloy, the invention adopts multiple-time vacuum self-consuming smelting method on the basis of routine technique, adopts a 'constant speed' finished product smelting method and adopts smelting speed control parameters to control the technological parameters in the finished product smelting process.The invention is characterized in that the smelting speed control parameter is 20-32Kg / min; the real smelting weight is on-line measured each second or according to a set time and an instant smelting speed is the ratio of the real smelting weight and the measurement time interval; if the smelting speed is higher than a desired value, the smelting current is then reduced; if the smelting speed is lower than the desired value, the smelting current is then increased. By using the control method, temperature field can be controlled effectively, distribution coefficient can be optimized, stabilization of the from and depth of the melting bath can be assured, which make the ingot casting sequence and solidification process stable and controllable, and homogeneity of components of large-scale ingot casting can also be assured.

Description

technical field [0001] The invention relates to a method for preparing a large Ti-6Al-4V titanium alloy ingot. With automatic batching, material mixing, consumable electrode vacuum welding and finished product "constant melting rate melting", the stable realization of Φ900mm~Φ1050mm Ti-6Al -Industrialized mass production of large ingots of 4V titanium alloys. Background technique [0002] Ti-6Al-4V titanium alloy has the advantages of high specific strength, good corrosion resistance, non-magnetic, shock and vibration resistance, good machinability and weldability, and is widely used in aviation, aerospace, ships, chemicals, marine and other fields. At present, the conventional ingot shape of the industrially produced Ti-6Al-4V titanium alloy ingot is about Φ600mm~Φ700mm. Generally speaking, as the size of the ingot increases, the difficulty of smelting increases, and the composition uniformity of large ingots is often difficult to ensure. According to relevant information...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/12
Inventor 陈战乾王韦琪陈峰李献军乔璐邹伟文志刚丁长勤
Owner BAOJI TITANIUM IND CO LTD
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