CN101476050A - Preparation of Ti-6Al-4V titanium alloy large-sized casting ingot - Google Patents
Preparation of Ti-6Al-4V titanium alloy large-sized casting ingot Download PDFInfo
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- CN101476050A CN101476050A CNA2008102323670A CN200810232367A CN101476050A CN 101476050 A CN101476050 A CN 101476050A CN A2008102323670 A CNA2008102323670 A CN A2008102323670A CN 200810232367 A CN200810232367 A CN 200810232367A CN 101476050 A CN101476050 A CN 101476050A
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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
The present invention relates to a kind of Ti-6Al-4V titanium alloy large-sized casting ingot preparation method, with automatic blending, interspersion material, consumable electrode vacuum assembly welding and finished product " permanent molten fast thawing refining ", the stable industrialized mass production that has realized Φ 900mm～Φ 1050mm Ti-6Al-4V titanium alloy large-sized casting ingot.
Background technology
The Ti-6Al-4V titanium alloy has the specific tenacity height, corrosion resisting property is good, nonmagnetic, shock resistance shakes, can process and weldability can wait advantage well, is widely used in fields such as Aeronautics and Astronautics, naval vessel, chemical industry, ocean.At present, the conventional ingot shape of the Ti-6Al-4V titan alloy casting ingot of suitability for industrialized production is about Φ 600mm～Φ 700mm.In general, along with the increase of ingot shape, bring the increasing of melting difficulty, the homogeneity of ingredients of large-sized casting ingot usually is difficult to be guaranteed.According to related data, about the Ti-6Al-4V titan alloy casting ingot up Φ 800mm of domestic production.
Along with international, domestic air mail industrial expansion, the development trend of airplane complete machine design is to reduce welding, and load spare adopts heavy froging and large-scale integral forging.Reached Φ 400mm as heavy froging with the large scale rod bar diameter of base, large-sized casting ingot is significant to improving large scale rod bar quality conformance, stability and lumber recovery, thereby presses for the Ti-6Al-4V titanium alloy large-sized casting ingot of the uniform Φ 900mm of composition～Φ 1050mm diameter.But, has the positive segregation tendency owing to vanadium contained in the Ti-6Al-4V titanium alloy, partition ratio K＜1 of aluminium element.So along with the increase of ingot casting specification, segregation is more obvious.
Summary of the invention
The technical problem that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of Ti-6Al-4V titanium alloy large-sized casting ingot preparation method, the preparation of Ti-6Al-4V titan alloy casting ingot a kind of suitable suitability for industrialized production, the uniform Φ 900mm of composition～Φ 1050mm diameter is provided, can solves the difficult problem of large-scale high-quality electrode preparation and major diameter ingot casting melting homogeneity control.
Technical scheme
Basic thought of the present invention is: contained vanadium, partition ratio K＜1 of aluminium element in the Ti-6Al-4V titanium alloy have the positive segregation tendency.Along with the increase of ingot casting specification, segregation is more obvious.The K value changes with the variation of processing condition in melting process, selects preferable melting technology parameter can optimize the partition ratio of alloying element, makes it approach 1, to guarantee the homogeneity of ingot casting composition.Ti-6Al-4V large-sized casting ingot preparation method among the present invention, on the basis of common process route, adopt repeatedly vacuum consumable smelting, wherein finished product melting utilization possesses 10 tons of vacuum consumable electrode arc furnaces employings " permanent molten fast thawing refining " of weighing system and automatic control system, adopts the processing parameter that melts in the melting of speed control system parameter control finished product.
The Ti-6Al-4V titanium alloy large-sized casting ingot preparation method that the present invention proposes is characterized in that step is as follows:
A vacuum consumable smelting melting of step 3, the melting current control is at 18～38KA, and voltage control is at 33～41V;
The melting of step 4 secondary vacuum consumable smelting, the melting current control is at 18～38KA, and voltage control is at 33～41V;
The melting of step 5 finished product vacuum consumable smelting: adopt permanent molten fast thawing sweetening process, molten speed control system parameter is: 20～32Kg/min; Online detection p.s. or detect actual melting weight, obtain molten immediately speed with actual melting weight and the ratio that detects interval time according to setting-up time; If molten speed reduces the melting electric current when being higher than target value; If molten speed increases the melting electric current when being lower than target value.
Beneficial effect
Ti-6Al-4V titanium alloy large-sized casting ingot preparation method of the present invention, having broken through traditional is the conventional melting method of controlled variable with electric current, voltage, works out " permanent molten fast thawing refining " technology of the fusing weight of electrode in the control unit time.Adopt effectively controlled temperature field of this control mode, optimize partition ratio, guaranteed the stable of the melting pool shape and the degree of depth, make ingot casting consecutive solidification process stabilization, controlled, make melting, crystallisation process stablize, guaranteed the homogeneity of big specification ingot casting composition.
Description of drawings
Fig. 1: sample position figure
Embodiment
Now in conjunction with the accompanying drawings the present invention is further described:
Below three embodiment all use 10 tons of vacuum consumable electrode arc furnaces that possess weighing system and automatic control system to implement.
Embodiment 1:(534-20071540 ingot, Φ 940mm)
A vacuum consumable smelting melting of step 3, crucible Φ 710mm, the melting current control is at 18～25KA, and voltage control is at 33～35V;
The melting of step 4 secondary vacuum consumable smelting, crucible Φ 820mm, the melting current control is at 18～25KA, and voltage control is at 33～35V;
The melting of step 5 finished product vacuum consumable smelting: crucible Φ 940mm, adopt permanent molten fast thawing sweetening process, molten speed control system parameter is: 20～23Kg/min; On-line detecting system p.s. or detect actual melting weight, obtain molten immediately speed with actual melting weight and the ratio that detects interval time according to setting-up time; If molten speed reduces the melting electric current when being higher than target value; If molten speed increases the melting electric current when being lower than target value.
534-20071540 ingot multidraw analytical results sees Table 1 (Fig. 1 is seen in the sample position), and by table 1 as seen, ingot casting vertically, laterally composition is even.
Table 1 534-20071540
#Ingot principal element multidraw analytical results (weight percent, %)
Remarks: standard-required is Al 5.5～6.75%, and V 3.5～4.5%.
Embodiment 2 (534-20071991 ingot, Φ 940mm)
A vacuum consumable smelting melting of step 3, crucible Φ 710mm, the melting current control is at 23～30KA, and voltage control is at 35～38V;
The melting of step 4 secondary vacuum consumable smelting, crucible Φ 820mm, the melting current control is at 23～30KA, and voltage control is at 35～38V;
The melting of step 5 finished product vacuum consumable smelting: crucible Φ 940mm, adopt permanent molten fast thawing sweetening process, molten speed control system parameter is: 25～28Kg/min; On-line detecting system p.s. or detect actual melting weight, obtain molten immediately speed with actual melting weight and the ratio that detects interval time according to setting-up time; If molten speed reduces the melting electric current when being higher than target value; If molten speed increases the melting electric current when being lower than target value.
534-20071991 ingot routine sampling analytical results sees Table 2, and is even by the visible ingot casting composition of table 2.
Table 2 534-20071991# ingot casting chemical ingredients (weight percent, %)
Embodiment 3 (534-20080688 ingot, Φ 1040mm)
A vacuum consumable smelting melting of step 3, crucible Φ 820mm, the melting current control is at 30～38KA, and voltage control is at 38～41V;
The melting of step 4 secondary vacuum consumable smelting, crucible Φ 940mm, the melting current control is at 30～38KA, and voltage control is at 38～41V;
The melting of step 5 finished product vacuum consumable smelting: crucible Φ 1040mm, adopt permanent molten fast thawing sweetening process, molten speed control system parameter is: 29～32Kg/min; On-line detecting system p.s. or detect actual melting weight, obtain molten immediately speed with actual melting weight and the ratio that detects interval time according to setting-up time; If molten speed reduces the melting electric current when being higher than target value; If molten speed increases the melting electric current when being lower than target value.
534-20080688 ingot sampling analysis the results are shown in Table 3, and by table 3 as seen, ingot casting different sites composition is even.
Table 3
Claims (1)
1. Ti-6Al-4V titanium alloy large-sized casting ingot preparation method is characterized in that step is as follows:
Step 1 batch mixing and electrode compacting: according to the component of Ti-6Al-4V alloy, be that master alloy carries out batch mixing with A-V, and the compacting electrode block;
Step 2 electrode preparation: adopt vacuum plasma arc electrode assembly welding method with the electrode block that suppresses, prepare large-scale consumable electrode, welding preliminary vacuum≤10Pa;
A vacuum consumable smelting melting of step 3, the melting current control is at 18～38KA, and voltage control is at 33～41V;
The melting of step 4 secondary vacuum consumable smelting, the melting current control is at 18～38KA, and voltage control is at 33～41V;
The melting of step 5 finished product vacuum consumable smelting: adopt permanent molten fast thawing sweetening process, molten speed control system parameter is: 20～32Kg/min; Online detection p.s. or detect actual melting weight, obtain molten immediately speed with actual melting weight and the ratio that detects interval time according to setting-up time; If molten speed reduces the melting electric current when being higher than target value; If molten speed increases the melting electric current when being lower than target value.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925841A (en) * | 2016-05-25 | 2016-09-07 | 西部超导材料科技股份有限公司 | Method for preparing large-sized Ti-1023 (Ti-10V-2Fe-3Al) alloy cast ingot |
| CN106119576A (en) * | 2016-06-30 | 2016-11-16 | 洛阳双瑞精铸钛业有限公司 | A kind of melting recovery method of lath-shaped titanium defective material |
| CN107252889A (en) * | 2017-05-26 | 2017-10-17 | 西安赛特思迈钛业有限公司 | A kind of preparation method of titanium alloy large-sized casting ingot consutrode |
| CN112126805A (en) * | 2020-08-27 | 2020-12-25 | 重庆金世利航空材料有限公司 | Preparation method of industrial pure titanium or TC4 titanium alloy ingot with weight of 10 t-15 t |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101033512A (en) * | 2006-03-07 | 2007-09-12 | 西安赛特金属材料开发有限公司 | Method of producing electrode for titanium alloy vacuum consumable smelting directly added with high melting metal |
| CN100503855C (en) * | 2006-07-27 | 2009-06-24 | 昆明冶金研究院 | Beta titanium alloy product and its smelting process and heat treatment process |
| CN101181745B (en) * | 2007-12-10 | 2012-08-29 | 西北有色金属研究院 | Method for preparing titanium alloy cast ingot |
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2008
- 2008-11-21 CN CN2008102323670A patent/CN101476050B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925841A (en) * | 2016-05-25 | 2016-09-07 | 西部超导材料科技股份有限公司 | Method for preparing large-sized Ti-1023 (Ti-10V-2Fe-3Al) alloy cast ingot |
| CN106119576A (en) * | 2016-06-30 | 2016-11-16 | 洛阳双瑞精铸钛业有限公司 | A kind of melting recovery method of lath-shaped titanium defective material |
| CN107252889A (en) * | 2017-05-26 | 2017-10-17 | 西安赛特思迈钛业有限公司 | A kind of preparation method of titanium alloy large-sized casting ingot consutrode |
| CN112126805A (en) * | 2020-08-27 | 2020-12-25 | 重庆金世利航空材料有限公司 | Preparation method of industrial pure titanium or TC4 titanium alloy ingot with weight of 10 t-15 t |
| CN112126805B (en) * | 2020-08-27 | 2021-05-14 | 重庆金世利航空材料有限公司 | Preparation method of industrial pure titanium or TC4 titanium alloy ingot with weight of 10 t-15 t |
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