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Titanium alloy cast ingot and preparing method thereof

A technology for titanium alloy and ingot casting, applied in the field of titanium alloy ingot and its preparation, can solve the problems of uniformity of ingot composition and adverse effects of microstructure solidification, large smelting current, long feeding time, etc., and achieve chemical composition distribution. The effect of uniformity, reducing impurity content and improving uniformity

Active Publication Date: 2020-04-03
湖南湘投金天钛业科技股份有限公司
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Problems solved by technology

However, due to the large smelting current and long feeding time of large-scale ingots, there are adverse effects on the composition uniformity and structure solidification of the ingots. Therefore, the composition of titanium alloy ingots with specifications above Φ780mm, especially the ingot head The uniformity is difficult to guarantee, and the yield is low, so it is necessary to improve the smelting process

Method used

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  • Titanium alloy cast ingot and preparing method thereof
  • Titanium alloy cast ingot and preparing method thereof
  • Titanium alloy cast ingot and preparing method thereof

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preparation example Construction

[0031] A method for preparing a titanium alloy ingot according to an embodiment includes the following steps S1-S3.

[0032] S1. Dosing according to the ingredients required for the titanium alloy ingot to be prepared, mixing and pressing to form an electrode block.

[0033] In one embodiment, the total weight of the ingredients is 5000Kg-9400Kg.

[0034] In one embodiment, the specification of the electrode block is Φ480mm~Φ680mm, and the density of the electrode block is 3.4g / cm 3 ~3.6g / cm 3 .

[0035] Further, the shape of the electrode block is cylindrical.

[0036] Specifically, mix the titanium sponge and master alloy that meet the standards according to the ingredients required by the TA15 titanium alloy grade of GB / T3620.1. After the ingredients are fully mixed and uniform, press them into a specification of Φ480mm~Φ680mm and a density of 3.4g / cm 3 ~3.6g / cm 3 multiple electrode blocks.

[0037] S2. Stack and weld the plurality of electrode blocks to obtain consum...

Embodiment 1

[0057] Example 1: Preparation of a TA15 titanium alloy ingot with a specification of Φ780mm

[0058] 1) Mix the titanium sponge and intermediate alloy that meet the standards according to the ingredients required by the TA15 titanium alloy grade of GB / T3620.1. After mixing the ingredients well, press them into a specification of Φ480mm and a density of 3.4g / cm 3 ~3.6g / cm 3 The circular electrode blocks are stacked into cylindrical strip electrodes.

[0059] 2) Weld the cylindrical long electrode in the vacuum plasma welding box with a welding torch with a water-cooled copper electrode tip to become a consumable electrode.

[0060] 3) The consumable electrode is smelted for the first time in a vacuum consumable electric arc furnace, using a crucible with a diameter of Φ580mm, the melting current is 14KA-18KA, the melting voltage is 28V-34V, the melting vacuum is ≤10Pa, and the arc is stable. The current is DC 6A~10A, and after smelting, it is cooled to about 350°C to obtain a...

Embodiment 2

[0074] Embodiment 2: the preparation specification is the TC4 titanium alloy ingot of Φ980mm

[0075] 1) Mix the titanium sponge and master alloy that meet the standards according to the ingredients required by the TC4 titanium alloy grade in GB / T3620.1. After mixing the ingredients evenly, press them into a size of Φ680mm and a density of 3.4g / cm 3 ~3.6g / cm 3 The circular electrode blocks are stacked into cylindrical strip electrodes.

[0076] 2) Weld the cylindrical strip electrode in the vacuum plasma welding box with a welding torch with a water-cooled copper electrode tip to become a consumable electrode.

[0077] 3) The consumable electrode is smelted for the first time in a vacuum consumable electric arc furnace, using a crucible with a diameter of Φ780mm, a melting current of 18KA-21KA, a melting voltage of 32V-36V, a melting vacuum of ≤10Pa, and a stable arc current It is direct current 8A~12A, and after smelting, it is cooled to below 400°C to obtain a primary ingo...

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Abstract

The invention relates to a titanium alloy cast ingot and a preparing method thereof. The preparing method comprises the following steps that dosing and mixing are carried out according to components needed for preparing the titanium alloy cast ingot, and the materials are pressed into a plurality of electrode blocks; the electrode blocks are stacked and welded, and a consumable electrode is obtained; and the consumable electrode is subjected to three-times vacuum consumable electro-arc smelting, cooling is carried out, and the titanium alloy cast ingot is obtained, wherein three-times vacuum consumable electro-arc smelting includes an early smelting stage and a feeding stage at the later stage of the smelting stage; and in the feeding stage, smelting current and smelting voltage are controlled to be gradually reduced, the vacuum degree of the feeding stage is reduced to be 5 Pa-8 Pa from the vacuum degree which is not higher than 5 Pa at the smelting stage, and the liquid feeding temperature of cooling liquid at the feeding stage is adjusted to be 31 DEG C-33 DEG C from the liquid feeding temperature which is 27 DEG C-28 DEG C at the smelting stage. According to the method, VAR three-times smelting is adopted in combination with a proper feeding technology, the uniformity of the chemical components of the cast ingot can be ensured, the proportion of dead heads can be reduced, and the rate of finished products can be improved.

Description

technical field [0001] The invention relates to the technical field of titanium alloy material processing, in particular to a titanium alloy ingot and a preparation method thereof. Background technique [0002] With the development of technology and the large-scale and integrated requirements of aviation forgings, the specification requirements for titanium alloy ingots are getting larger and higher, and the quality requirements for ingots are getting higher and higher. At present, for titanium alloy vacuum consumable melting, when the electrode has a certain weight remaining, it generally needs to be fed. Shrinkage feeding is an effective measure to improve the quality of the ingot when the finished titanium alloy ingot is smelted. Its purpose is to reduce the shrinkage cavity, porosity and segregation area at the head of the ingot, reduce the amount of cutting of the ingot, and increase the yield. However, due to the large smelting current and long feeding time of large-s...

Claims

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Application Information

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IPC IPC(8): C22B9/20C22C14/00C22C1/02
CPCC22B9/20C22C1/02C22C14/00
Inventor 彭晖樊凯胡珊珊朱雪峰黄艳华
Owner 湖南湘投金天钛业科技股份有限公司
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