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Titanium alloy ingot and preparation method thereof

A technology of titanium alloy and ingot casting, which is applied in the field of titanium alloy ingot casting and its preparation, to achieve the effect of reducing the depth of shrinkage cavity, reducing the depth of molten pool and improving the effect of feeding

Active Publication Date: 2022-07-05
湖南湘投金天钛业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a titanium alloy ingot and its preparation method, which can improve the problems of composition segregation and β spots in the center of the riser area of ​​the easily segregated titanium alloy ingot

Method used

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  • Titanium alloy ingot and preparation method thereof
  • Titanium alloy ingot and preparation method thereof
  • Titanium alloy ingot and preparation method thereof

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preparation example Construction

[0029] An embodiment of the present invention provides a method for preparing a titanium alloy ingot, comprising the following steps:

[0030] The non-finished titanium alloy ingots containing easily segregated elements are used as consumable electrodes, and vacuum consumable arc smelting is used to smelt the finished product. The finished smelting includes a stable smelting stage and a feeding stage in sequence; the smelting current in the feeding stage is step-by-step and the decreasing rate of smelting current at all levels is (0.02~0.5)KA / min→(0.02~0.2)KA / min→(0.2~2)KA / min→(0.02~0.2)KA / min.

[0031] Among them, the unit KA / min is kiloampere per minute, which refers to the value of current reduction per minute.

[0032] Among them, the segregation-prone elements include at least one of Cu, Fe, Cr, Mo, and Nb.

[0033] The technical personnel of the present invention have found through a lot of research that the rapid current drop in the early stage of the feeding stage is ...

Embodiment 1

[0059] 1) A preparation process of a Φ680mm specification TC17 (nominal composition Ti-5Al-2Sn-2Zr-4Mo-4Cr) titanium alloy ingot:

[0060] According to the required elements and proportions of TC17 alloy, the selected raw materials are mixed evenly, and then pressed into a TC17 electrode block with a size of Φ420×200mm on a hydraulic press. The pressed electrode block is combined into an electrode with a size of Φ420×4800mm, and then protected by argon gas. It is welded into a consumable electrode for smelting in the plasma welding box. The welding electrode is smelted twice by vacuum consumable arc, the vacuum degree is controlled below 10.0Pa in the first and second vacuum consumable arc smelting, the stable smelting current of the first smelting is 13KA, and the smelting voltage is 32V , the stable arc current is 10A; the second smelting stable smelting current is 21KA, the smelting voltage is 35V, the arc stabilizing current is 12A, the cooling time after smelting is not l...

Embodiment 2

[0070] 1) A preparation process of a Φ680mm specification TB6 (nominal composition Ti-10V-2Fe-3Al) titanium alloy ingot:

[0071] According to the required elements and proportions of the TB6 alloy, the selected raw materials are mixed uniformly and then pressed on a hydraulic press to form TB6 electrode blocks with a size of Φ420×200mm, and the pressed electrode blocks are combined into electrodes with a size of Φ420×4800mm. It is welded into a consumable electrode for smelting in the plasma welding box. The welding electrode is smelted twice by vacuum consumable arc, the vacuum degree is controlled below 10.0Pa in the first and second vacuum consumable arc smelting, the stable smelting current of the first smelting is 13KA, and the smelting voltage is 32V , the stable arc current is 10A; the second smelting stable smelting current is 19KA, the smelting voltage is 34V, the arc stabilizing current is 12A, and the cooling time after smelting is not less than 4 hours to obtain Φ...

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Abstract

The invention relates to a titanium alloy ingot and a preparation method thereof, comprising the steps of: using an unfinished titanium alloy ingot containing easily segregated elements as a consumable electrode, and using vacuum consumable arc smelting to smelt the finished product, and the finished product smelting comprises: The stable smelting stage and the feeding stage are carried out in sequence; the smelting current in the feeding stage is gradually reduced, and the decreasing rate of the smelting current at each stage is (0.02-0.5) KA / min→(0.02-0.2) KA / min →(0.2~2)KA / min→(0.02~0.2)KA / min. On the basis of the conventional feeding process, the present invention greatly reduces the current reduction rate in the early stage of the feeding stage, and controls the current reduction rate at all levels, so that the molten pool can be slowly raised and the depth of the molten pool can be reduced. , to reduce the tendency of element segregation in the center of the riser area, thereby improving the problem of component segregation and beta spot in the riser area.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a titanium alloy ingot and a preparation method thereof. Background technique [0002] When the titanium alloy is smelted by vacuum consumable (VAR smelting), the titanium alloy ingot is gradually solidified upward from the bottom of the ingot in order. Due to the equilibrium distribution coefficient K of each alloy element in the titanium alloy 0 The difference in segregation degree (also called segregation degree) makes some alloying elements of titanium alloy ingots distribute regularly in various parts of the whole ingot, resulting in segregation effect. Balanced distribution coefficient K 0 Elements > 1 will be enriched in the bottom and edge of the ingot, which is called positive segregation; equilibrium partition coefficient K 0 Elements < 1 will be enriched in the head and core of the ingot, which is called negative segregation. K 0 The farther it deviat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C14/00C22B9/20
CPCC22C1/02C22C14/00C22B9/20
Inventor 肖祥澳李超樊凯潘艺夫陈领
Owner 湖南湘投金天钛业科技股份有限公司
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