CN109487092A - A kind of Ti6321 titan alloy casting ingot melting shrinkage compensation method - Google Patents
A kind of Ti6321 titan alloy casting ingot melting shrinkage compensation method Download PDFInfo
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- C22C1/03—Making non-ferrous alloys by melting using master alloys
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Abstract
The invention discloses a kind of Ti6321 titan alloy casting ingot melting shrinkage compensation methods, are used to prepare the Ti6321 titan alloy casting ingot of Φ 820~Φ 1020mm specification.First by titanium sponge, aluminium molybdenum alloys, NbTi alloy, sponge zirconium, Al beans and TiO2Ingredient is carried out according to proportion required by GB/T3620.1, it is pressed into electrode block after mixing, consutrode is prepared as after electrode block is carried out vacuum plasma welding, then consutrode is subjected to vacuum arc melting three times, feeding is carried out using melting speed control mode in the feeding phase, molten speed reduces step by step, after molten speed is reduced to 0kg/min, it using the electric current of 4~6KA, trips after keeping the temperature 80~120min, obtains finished product ingot casting after carrying out surface machining after cooling.The present invention solves the problems, such as Ti6321 titan alloy casting ingot riser than great, ingot casting yield rate is low, casting head homogeneity of ingredients is poor.
Description
Technical field
The invention belongs to technical field of nonferrous metal processing, and in particular to a kind of Ti6321 titan alloy casting ingot melting feeding side
Method.
Background technique
Ti6321 titanium alloy is that China innovates the nearly α of strong high-ductility type in the one kind developed on the basis of Ti6211 titanium alloy
Marine titanium alloy, except possessing, the high common specific strength of titanium alloy material, nonmagnetic, entrant sound and anti-marine environment ability etc. are comprehensive
It closes outside performance, is also equipped with high impact toughness, high-fracture toughness and good weldability energy, has completed each under briny environment
Class application study is that China's application study is most perfect, most sufficient naval titanium alloys, be widely used at present pressure hull,
Construction such as high-pressure bottle, Ship Welding structural member etc..
Titanium Alloy for Ship structural member develops towards integration and enlarged direction at present, and the ingot casting production of super large-scale is
Increasingly urgent, however, the increase of ingot casting specification is so that its homogeneity of ingredients and yield rate are affected.
Existing routine Ti6321 titanium alloy finished product ingot diameters are generally no greater than 720mm, are 5000kg situation in inventory
Under, riser weight is more than 150kg, and proportion is considered to be worth doing again more than 130kg, the practical yield rate of ingot casting, can less than 92% close to 3%
Using ingot casting weight less than 4600kg, and Al, Nb, Zr, Mo host element head transverse direction ingredient are very poor more than 3500ppm, O element head
Portion's transverse direction ingredient is very poor more than 400ppm, it is difficult to meet the materials demand of naval vessel ultra-large type forging.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, one kind is provided and is adapted to 820~Φ of Φ 1020mm
The Ti6321 titan alloy casting ingot melting shrinkage compensation method of specification, by selecting reasonable type of raw materials and formulating reasonable smelter
Skill parameter solves Ti6321 titan alloy casting ingot riser and asks than great, ingot casting yield rate is low, casting head homogeneity of ingredients is poor
Topic.
The present invention is achieved through the following technical solutions: a kind of Ti6321 titan alloy casting ingot melting shrinkage compensation method, tool
Body the following steps are included:
(1) it is equipped with raw material, chooses titanium sponge, sponge zirconium, aluminium molybdenum alloys, NbTi alloy, Al beans and TiO2According to GB/
The proportion that T3620.1 is required carries out ingredient；
(2) mixing and it is pressed into electrode block；
(3) to the electrode block spelling of step (2), welding, consutrode is obtained；
(4) vacuum arc melting three times is carried out to the consutrode of step (3), fusion process is controlled in vacuum degree 5.0Pa
Hereinafter, melting 10~42KA of electric current, melting 25~45V of voltage, cooling time is not less than 6 hours after melting, and third time vacuum is certainly
It consumes electric arc melting to control using burn-off rate, the melting later period enters the feeding stage, and burn-off rate reduces step by step, finally obtains
Ti6321 titan alloy casting ingot；
(5) surface is carried out to the Ti6321 titan alloy casting ingot of step (4) to machine to obtain Ti6321 titanium alloy finished product ingot casting.
Further, it is 8000~12500kg that the step (1), which is equipped with the ingredient total weight of raw material,.
Further, step (2) mixing and it is pressed into electrode block, specifically included:
(2.1) step (1) is matched the raw material got ready to be sufficiently mixed uniformly, completes mixing；
(2.2) mixing mixed through step (2.1) being pressed into electrode block with hydraulic press, the pressure of the compacting is 28~
38Mpa。
Further, the hydraulic press in the step (2.2) selects 8000t hydraulic press.
Further, the welding of electrode block is welded using vacuum plasma in the step (3).
Further, the step (4) carries out vacuum arc melting three times to the consutrode of step (3), specifically includes:
(4.1) first time vacuum arc melting is controlled leak rate in fusion process and is existed using the crucible of diameter of phi 820mm
1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 10~40KA of electric current, melting 25~40V of voltage, when cooling after melting
Between be not less than 6 hours；
(4.2) second of vacuum consumable arc-melting use the crucible of diameter of phi 920mm, and leak rate is controlled in fusion process
In 1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 10~40KA of electric current, melting voltage 25~405V is cold after melting
But the time is not less than 6 hours；
(4.3) third time vacuum consumable arc-melting uses the crucible of diameter of phi 1020mm, and leakage is controlled in fusion process
Rate in 0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 35~45V of melting electric current 30~40KA melting voltage；From power consumption
Feeding is initially entered when pole melting 400~650kg of remaining weight, feeding is carried out using burn-off rate control mode, burn-off rate
Reduce step by step, when molten end, reserved weight is 30~50kg, after speed of melting is 0kg/min, under 4~6KA electric current, heat preservation 80~
120min is gradually lifted molten bath using the soaking time, reduces shrinkage cavity depth, and cooling time is not less than 10 hours after melting.
Further, the feeding stage is carried out using burn-off rate control mode, and the burn-off rate is according to 7 → 4 → 2 → 1
→ 0.8 → 0.3 → 0 slope reduces step by step, when reserved weight is 30~50kg, after burn-off rate is 0kg/min, using 4~
The electric current of 6KA keeps the temperature 80~120min.
Further, the burn-off rate in feeding stage reduces step by step according to 8 → 5 → 3 → 1 → 0.4 → 0.2 → 0 slope,
When reserved weight is 30~50kg, after burn-off rate is 0kg/min, using the electric current of 4~6KA, 80~120min of heat preservation.
It can be seen that the beneficial effects of the present invention are: Ti6321 titan alloy casting ingot melting feeding side provided by the invention
Method, prepared by the Ti6321 titan alloy casting ingot melting suitable for Φ 820~Φ 1020mm specification, by VAR melting three times, using conjunction
Suitable melting speed control feeding technology make the riser specific gravity control of the Ti6321 titan alloy casting ingot of Φ 1020mm specification 2.2% with
It is interior, and make head host element transverse direction distributed components；In fusion process, leak rate control is in 1.2Pa/min hereinafter, vacuum degree control
System is in 5.0Pa hereinafter, being to accurately control big size ingot-casting O constituent content；Melting 10~42kA of electric current, melting voltage 25~
45V is alloying and homogenization in order to sufficiently carry out element, and it is to guarantee feeding rank that the feeding stage, which uses melting speed control,
The process stability of section.
In addition, during third time vacuum consumable arc-melting, when molten speed is 0kg/min, using the small electricity of 4~6KA
It flows down 80~120min of heat preservation and is for gradually stable lifting shrinkage cavity depth, homogeneity of ingredients is good, high yield rate to prepare
Big specification Ti6321 ingot casting.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, below with reference to embodiment to this hair
It is bright to be described in further detail.
Embodiment 1:
The present invention provides a kind of Ti6321 titan alloy casting ingot melting shrinkage compensation methods, are suitable for 820~Φ of Φ 1020mm and advise
It is prepared by the Ti6321 titan alloy casting ingot melting of lattice, specifically includes the following steps:
(1) it is equipped with raw material, chooses titanium sponge, sponge zirconium, aluminium molybdenum alloys, NbTi alloy, Al beans and TiO2According to GB/
The proportion that T3620.1 is required carries out ingredient；
(2) mixing and it is pressed into electrode block；
(3) to the electrode block spelling of step (2), welding, consutrode is obtained；
(4) vacuum arc melting three times is carried out to the consutrode of step (3), fusion process is controlled in vacuum degree 5.0Pa
Hereinafter, melting 10~42KA of electric current, melting 25~45V of voltage, cooling time is not less than 6 hours after melting, and third time vacuum is certainly
It consumes electric arc melting to control using burn-off rate, the melting later period enters the feeding stage, and burn-off rate reduces step by step, finally obtains
Ti6321 titan alloy casting ingot；
(5) surface is carried out to the Ti6321 titan alloy casting ingot of step (4) to machine to obtain Ti6321 titanium alloy finished product ingot casting.
Further, the step (1) be equipped with step (1) described in raw material be equipped with the ingredient total weight of raw material be 8000~
12500kg。
Further, step (2) mixing and it is pressed into electrode block, specifically included:
(2.1) step (1) is matched the raw material got ready to be sufficiently mixed uniformly, completes mixing；
(2.2) mixing mixed through step (2.1) being pressed into electrode block with hydraulic press, the pressure of the compacting is 28~
38Mpa。
Further, the hydraulic press in the step (2.2) selects 8000t hydraulic press.
Further, the welding of electrode block is welded using vacuum plasma in the step (3).
Further, the step (4) carries out vacuum arc melting to the consutrode of step (3) and obtains Ti6Al7Nb titanium
Alloy cast ingot specifically includes:
(4.1) first time vacuum arc melting is controlled leak rate in fusion process and is existed using the crucible of diameter of phi 820mm
1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 10~40KA of electric current, melting 25~40V of voltage, when cooling after melting
Between be not less than 6 hours；
(4.2) second of vacuum consumable arc-melting use the crucible of diameter of phi 920mm, and leak rate is controlled in fusion process
In 1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 10~40KA of electric current, melting 25~40V of voltage, it is cooling after melting
Time is not less than 6 hours；
(4.3) third time vacuum consumable arc-melting uses the crucible of diameter of phi 1020mm, and leakage is controlled in fusion process
Rate in 0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 35~45V of melting electric current 30~40KA melting voltage；From power consumption
Feeding is initially entered when pole melting 400~650kg of remaining weight, feeding is carried out using burn-off rate control mode, burn-off rate
Reduce step by step, when molten end, reserved weight is 30~50kg, after speed of melting is 0kg/min, under 4~6KA electric current, heat preservation 80~
120min is gradually lifted molten bath using the soaking time, reduces shrinkage cavity depth, and cooling time is not less than 10 hours after melting.
Further, the feeding stage is carried out using burn-off rate control mode, and the burn-off rate is according to 7 → 4 → 2 → 1
→ 0.8 → 0.3 → 0 slope reduces step by step, when its molten reserved weight in end is that 30~50kg is adopted after burn-off rate is 0kg/min
With the electric current of 4~6KA, 80~120min is kept the temperature.
Further, the burn-off rate in feeding stage reduces step by step according to 8 → 5 → 3 → 1 → 0.4 → 0.2 → 0 slope,
When reserved weight is 30~50kg, after burn-off rate is 0kg/min, using the electric current of 4~6KA, 80~120min of heat preservation.
Embodiment 2:
The present invention also provides a kind of Ti6321 titan alloy casting ingot melting shrinkage compensation methods, are suitable for 820~Φ of Φ 1020mm
It is prepared by the Ti6321 titan alloy casting ingot melting of specification, specifically includes the following steps:
(1) it is equipped with raw material: choosing titanium sponge, sponge zirconium, aluminium molybdenum alloys, NbTi alloy, Al beans and TiO2According to Ti-
The proportion of 6.3Al-3.2Nb-2.0Zr-1.5Mo-0.09O carries out ingredient, and ingredient total weight is 12500kg；
(2) it mixing and is pressed into electrode block: step (1) being matched into the raw material got ready is sufficiently mixed and uniformly complete mixing, use
8000 tons of hydraulic presses are compressed into electrode block, and the pressure of compacting is 35MPa；
(3) electrode block for obtaining step 2 carries out vacuum plasma welding, obtains consutrode；
(4) vacuum arc melting three times is carried out to the consutrode of step (3), specifically:
First time vacuum consumable arc-melting is controlled leak rate in fusion process and is existed using the crucible of diameter of phi 820mm
1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 10~22KA of electric current, melting 27~36V of voltage, when cooling after melting
Between be not less than 6 hours；
Second of vacuum consumable arc-melting uses the crucible of diameter of phi 920mm, and leak rate is controlled in fusion process and is existed
1.0Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 22~31KA of electric current, melting 30~40V of voltage, when cooling after melting
Between be not less than 7 hours；
Third time vacuum consumable arc-melting uses the crucible of Φ 1020mm, and leak rate is controlled in fusion process in 0.8Pa/
Min hereinafter, vacuum degree in 4.0Pa hereinafter, melting 30~40KA of electric current, melting 36~45V of voltage, in consumable electrode melting residue
Feeding is initially entered when weight 400kg, feeding is carried out using melting speed control mode, melts speed according to 7 → 4 → 2 → 1 → 0.8 → 0.3
→ 0 slope reduces step by step, when its molten reserved weight in end is 30kg, after molten speed is 0kg/min, using the electric current of 4kA, heat preservation
80min realizes the gradually lifting in molten bath, reduces shrinkage cavity depth, and cooling time is not less than 12 hours after melting；
(5) surface is carried out to the Ti6321 titan alloy casting ingot of step (4) to machine to obtain Ti6321 titanium alloy finished product ingot casting,
Detect a flaw sawing riser weight 260kg, and riser proportion is 2.08%.
In addition, in order to verify whether the Ti6321 titanium alloy finished product ingot casting of preparation method preparation meets the requirements of the standard, it will
The Φ 1020mm ingot casting that melting obtains in embodiment 2 carries out ten three points of samplings to its casting head transversal cross-section, ingot casting surface is indulged
Xiang Wudian sampling analysis ingot casting entirety ingredient uniformity results are shown in Tables 1 and 2:
Table 1 casting head transversal cross-section, ten three sampling results
| Position | Al | Nb | Zr | Mo | O |
| 1 | 6.12 | 3.13 | 1.96 | 1.32 | 0.08 |
| 2 | 6.10 | 3.04 | 1.94 | 1.28 | 0.08 |
| 3 | 6.14 | 3.10 | 1.90 | 1.26 | 0.07 |
| 4 | 6.00 | 3.15 | 1.85 | 1.33 | 0.08 |
| 5 | 5.97 | 3.20 | 1.93 | 1.35 | 0.06 |
| 6 | 5.97 | 3.21 | 1.80 | 1.40 | 0.07 |
| 7 | 5.92 | 3.19 | 1.85 | 1.37 | 0.08 |
| 8 | 5.94 | 3.16 | 1.83 | 1.35 | 0.08 |
| 9 | 5.97 | 3.18 | 1.90 | 1.28 | 0.06 |
| 10 | 6.01 | 3.10 | 1.92 | 1.31 | 0.06 |
| 11 | 6.08 | 3.08 | 1.85 | 1.33 | 0.07 |
| 12 | 6.12 | 3.09 | 1.92 | 1.29 | 0.08 |
| 13 | 6.14 | 3.12 | 1.80 | 1.35 | 0.08 |
Longitudinal 5 sampling results of 2 ingot casting surface of table
As can be seen from Table 1: laterally 13 homogeneity of ingredients are good at Ti6321 ingot casting riser position, and host element deviation exists
Within 3000ppm, O element deviation is 200ppm.
As can be seen from Table 2: resulting Ti6321 ingot casting longitudinal direction homogeneity of ingredients is good, and host element and impurity element accord with
Standardization requirement.
Embodiment 3:
The present invention also provides a kind of Ti6321 titan alloy casting ingot melting shrinkage compensation methods, are suitable for 820~Φ of Φ 1020mm
It is prepared by the Ti6321 titan alloy casting ingot melting of specification, specifically includes the following steps:
(1) it is equipped with raw material: choosing titanium sponge, sponge zirconium, aluminium molybdenum alloys, NbTi alloy, Al beans and TiO2According to Ti-
The proportion of 5.8Al-3.0Nb-1.8Zr-1.3Mo-0.10O carries out ingredient, and ingredient total weight is 10780kg；
(2) it mixing and is pressed into electrode block: step (1) being matched into the raw material got ready is sufficiently mixed and uniformly complete mixing, use
8000 tons of hydraulic presses are compressed into electrode block, and the pressure of compacting is 32MPa；
(3) electrode block for obtaining step 2 carries out vacuum plasma welding, obtains consutrode；
(4) vacuum arc melting three times is carried out to the consutrode of step (3), specifically:
First time vacuum consumable arc-melting is controlled leak rate in fusion process and is existed using the crucible of diameter of phi 820mm
1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 10~22KA of electric current, melting 27~36V of voltage, when cooling after melting
Between be not less than 6 hours；
Second of vacuum consumable arc-melting uses the crucible of diameter of phi 920mm, and leak rate is controlled in fusion process and is existed
1.0Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 22~31KA of electric current, melting 30~40V of voltage, when cooling after melting
Between be not less than 7 hours；
Third time vacuum consumable arc-melting uses the crucible of Φ 1020mm, and leak rate is controlled in fusion process in 0.7Pa/
Min hereinafter, vacuum degree in 2.0Pa hereinafter, melting 30~40KA of electric current, melting 35~42V of voltage, in consumable electrode melting residue
Feeding is initially entered when weight 500kg, the molten speed of feeding reduces step by step according to 8 → 5 → 3 → 1 → 0.4 → 0.2 → 0 slope, when
The molten reserved weight in end is 40kg, melts after speed is 0kg/min, using the electric current of 6KA, keeps the temperature 120min, and cooling time is not after melting
Less than 14 hours；
(5) surface is carried out to the Ti6321 titan alloy casting ingot of step (4) to machine to obtain Ti6321 titanium alloy finished product ingot casting,
Detect a flaw sawing riser weight 230kg, and riser proportion is 2.13%.
In addition, in order to verify whether the Ti6321 titanium alloy finished product ingot casting of preparation method preparation meets the requirements of the standard, it will
The Φ 1020mm ingot casting that melting obtains in embodiment 3 carries out ten three points of samplings to its casting head transversal cross-section, ingot casting surface is indulged
Xiang Wudian sampling analysis ingot casting entirety ingredient uniformity results are shown in Table 3 and table 4:
Table 3 casting head transversal cross-section, ten three sampling results
Longitudinal 5 sampling results of 4 ingot casting surface of table
As can be seen from Table 3: laterally 13 homogeneity of ingredients are good at resulting Ti6321 ingot casting riser position, and host element is inclined
For difference within 3000ppm, O element deviation is 200ppm.
As can be seen from Table 4: resulting Ti6321 ingot casting longitudinal direction homogeneity of ingredients is good, and host element and impurity element accord with
Standardization requirement.
Embodiment 4:
The present invention also provides a kind of Ti6321 titan alloy casting ingot melting shrinkage compensation methods, are suitable for 820~Φ of Φ 1020mm
It is prepared by the Ti6321 titan alloy casting ingot melting of specification, specifically includes the following steps:
(1) it is equipped with raw material: choosing the titanium sponge, aluminium molybdenum intermediate alloy, sponge zirconium, NbTi intermediate alloy, Al of national standard
Beans and TiO2Ingredient is carried out according to by Ti-6.0Al-2.8Nb-2.5Zr-1.5Mo-0.08O proportion, ingredient total weight is
9700kg；
(2) it mixing and is pressed into electrode block: step (1) being matched into the raw material got ready is sufficiently mixed and uniformly complete mixing, compacting
Pressure be 30MPa；
(3) electrode block for obtaining step 2 carries out vacuum plasma welding, obtains consutrode；
(4) vacuum arc melting three times is carried out to the consutrode of step (3), specifically:
First time melting use diameter of phi 820mm crucible, in fusion process control leak rate in 1.2Pa/min hereinafter,
Vacuum degree is in 5.0Pa hereinafter, melting 10~22KA of electric current, melting 27~36V of voltage, cooling time is not less than 6 hours after melting；
Second of melting use diameter of phi 920mm crucible, in fusion process control leak rate in 1.0Pa/min hereinafter,
Vacuum degree is in 5.0Pa hereinafter, melting 22~31KA of electric current, melting 30~40V of voltage, cooling time is not less than 7 hours after melting；
Third time vacuum arc furnace melting uses the crucible of Φ 1020mm, and leak rate is controlled in fusion process in 0.7Pa/
Min hereinafter, vacuum degree in 2.0Pa hereinafter, melting 30~40KA of electric current, melting 35~41V of voltage, in consumable electrode melting residue
Feeding is initially entered when weight 650kg, molten speed reduces step by step according to 8 → 5 → 3 → 1 → 0.4 → 0.2 → 0 slope, when molten end
Reserved weight is 50kg, melts speed using the electric current of 6KA, to keep the temperature 120min, cooling time is not less than after melting after 0kg/min
14 hours；
(5) surface is carried out to the Ti6321 titan alloy casting ingot of step (4) to machine to obtain Ti6321 titanium alloy finished product ingot casting,
Detect a flaw sawing riser weight 210kg, and riser proportion is 2.16%.
In addition, in order to verify whether the Ti6321 titanium alloy finished product ingot casting of preparation method preparation meets the requirements of the standard, it will
The Φ 1020mm ingot casting that melting obtains in embodiment 4 carries out ten three points of samplings to its casting head transversal cross-section, ingot casting surface is indulged
Xiang Wudian sampling analysis ingot casting entirety ingredient uniformity results are shown in Table 5 and table 6:
Table 5 casting head transversal cross-section, ten three sampling results
| Position | Al | Nb | Zr | Mo | O |
| 1 | 5.85 | 2.79 | 2.45 | 1.37 | 0.07 |
| 2 | 5.92 | 2.75 | 2.40 | 1.32 | 0.07 |
| 3 | 5.90 | 2.78 | 2.42 | 1.29 | 0.06 |
| 4 | 5.81 | 2.80 | 2.38 | 1.32 | 0.06 |
| 5 | 5.80 | 2.75 | 2.41 | 1.36 | 0.06 |
| 6 | 5.82 | 2.81 | 2.41 | 1.41 | 0.07 |
| 7 | 5.79 | 2.81 | 2.37 | 1.40 | 0.05 |
| 8 | 5.86 | 2.76 | 2.39 | 1.37 | 0.06 |
| 9 | 5.88 | 2.78 | 2.41 | 1.30 | 0.07 |
| 10 | 5.79 | 2.75 | 2.42 | 1.32 | 0.07 |
| 11 | 5.78 | 2.80 | 2.39 | 1.34 | 0.07 |
| 12 | 5.85 | 2.81 | 2.37 | 1.31 | 0.06 |
| 13 | 5.87 | 2.75 | 2.35 | 1.35 | 0.06 |
Longitudinal 5 sampling results of 6 ingot casting surface of table
As can be seen from Table 5: laterally 13 homogeneity of ingredients are good at resulting Ti6321 ingot casting riser position, and host element is inclined
For difference within 3000ppm, O element deviation is 200ppm.
As can be seen from Table 6: resulting Ti6321 ingot casting longitudinal direction homogeneity of ingredients is good, and host element and impurity element accord with
Standardization requirement.
It further, is the homogeneity of ingredients for guaranteeing ingot casting, selecting high-quality titanium sponge is to close among basis and aluminium molybdenum
Gold, sponge zirconium, NbTi alloy, Al beans, TiO2Mixing material is carried out, the main component scope control of ingot casting is in GB/T3620.1 range
It is interior.
In addition, Ti6321 titan alloy casting ingot melting shrinkage compensation method provided by the invention realizes former material by cloth and mixing
The uniformity of material in the electrodes；Compacting pressure control ensure that the enough consistency of electrode block in 28-38MPa；Using vacuum etc.
The welding that the mode of ion welding carries out electrode is consutrode welding oxidation in order to prevent, and obtains enough weld strengths；
Melting three times, strict control vacuum degree, leak rate, melting in fusion process are carried out using vacuum consumable arc-melting (VAR) method
Electric current and melting voltage, improve ingot casting in element and alloying effect and distributed components, the third time melting later period into
Row feeding, feeding stage are carried out using melting speed control mode, using the form for reducing molten speed and low current long-time heat preservation step by step
It is gradually lifted molten bath, reduces pool depth, shallower molten bath is finally obtained before current interruption, guarantee that riser ratio is no more than
2.2%.
To sum up, Ti6321 titan alloy casting ingot melting shrinkage compensation method disclosed by the invention is suitable for 820~Φ of Φ 1020mm and advises
Prepared by the Ti6321 titan alloy casting ingot melting of lattice, by VAR melting three times, make Φ using suitable melting speed control feeding technology
The riser specific gravity control of 1020mm specification Ti6321 titan alloy casting ingot makes head host element transverse direction ingredient point within 2.2%
Cloth is uniform.The ingot casting prepared using this method, laterally ten three ingredients are very poor is no more than on Al, Nb, Zr, Mo host element head
Lateral ten three points of 3000ppm, O element very poor no more than 200ppm.
The above is only a specific embodiment of the invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.
It should be understood that the invention is not limited to descriptions above, can carry out without departing from the scope it is various
Modifications and changes.The scope of the present invention is limited by the claims that follow.
Claims (8)
1. a kind of Ti6321 titan alloy casting ingot melting shrinkage compensation method, which is characterized in that specifically includes the following steps:
(1) it is equipped with raw material, chooses titanium sponge, sponge zirconium, aluminium molybdenum alloys, NbTi alloy, Al beans and TiO2It is wanted according to GB/T3620.1
The proportion asked carries out ingredient；
(2) mixing and it is pressed into electrode block；
(3) to the electrode block spelling of step (2), welding, consutrode is obtained；
(4) vacuum arc melting three times carried out to the consutrode of step (3), fusion process control in vacuum degree 5.0Pa hereinafter,
Melting 10~42KA of electric current, melting 25~45V of voltage, cooling time is not less than 6 hours after melting, third time vacuum consumable electric arc
Melting is controlled using burn-off rate, and the melting later period enters the feeding stage, and burn-off rate reduces step by step, finally obtains the conjunction of Ti6321 titanium
Golden ingot casting；
(5) surface is carried out to the Ti6321 titan alloy casting ingot of step (4) to machine to obtain Ti6321 titanium alloy finished product ingot casting.
2. Ti6321 titan alloy casting ingot melting shrinkage compensation method according to claim 1, which is characterized in that the step (1)
The ingredient total weight for being equipped with raw material is 8000~12500kg.
3. Ti6321 titan alloy casting ingot melting shrinkage compensation method according to claim 1, which is characterized in that the step (2)
Mixing is simultaneously pressed into electrode block, specifically includes:
(2.1) step (1) is matched the raw material got ready to be sufficiently mixed uniformly, completes mixing；
(2.2) mixing mixed through step (2.1) being pressed into electrode block with hydraulic press, the pressure of the compacting is 28~
38Mpa。
4. Ti6321 titan alloy casting ingot melting shrinkage compensation method according to claim 3, which is characterized in that the step
(2.2) hydraulic press in selects 8000t hydraulic press.
5. Ti6321 titan alloy casting ingot melting shrinkage compensation method according to claim 1, which is characterized in that the step (3)
In the welding of electrode block is welded using vacuum plasma.
6. Ti6321 titan alloy casting ingot melting shrinkage compensation method according to claim 1, which is characterized in that the step (4)
Vacuum arc melting three times is carried out to the consutrode of step (3), is specifically included:
(4.1) first time vacuum arc melting is controlled leak rate in fusion process and is existed using the crucible of diameter of phi 820mm
1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 10~40KA of electric current, melting 25~40V of voltage, when cooling after melting
Between be not less than 6 hours；
(4.2) second of vacuum consumable arc-melting use the crucible of diameter of phi 920mm, control leak rate in fusion process and exist
1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 10~40KA of electric current, melting 25~405V of voltage, it is cooling after melting
Time is not less than 6 hours；
(4.3) third time vacuum consumable arc-melting uses the crucible of diameter of phi 1020mm, and leak rate is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 35~45V of melting electric current 30~40KA melting voltage；In consumbuble-electrode melting
Feeding is initially entered when refining 400~650kg of remaining weight, feeding is carried out using burn-off rate control mode, and burn-off rate is step by step
Reduce, when molten end, reserved weight is 30~50kg, after speed of melting is 0kg/min, under 4~6KA electric current, heat preservation 80~
120min is gradually lifted molten bath using the soaking time, reduces shrinkage cavity depth, and cooling time is not less than 10 hours after melting.
7. Ti6321 titan alloy casting ingot melting shrinkage compensation method according to claim 1 or 6, which is characterized in that the feeding stage
It is carried out using burn-off rate control mode, the burn-off rate drops step by step according to 7 → 4 → 2 → 1 → 0.8 → 0.3 → 0 slope
It is low, when reserved weight is 30~50kg, after burn-off rate is 0kg/min, using the electric current of 4~6KA, 80~120min of heat preservation.
8. Ti6321 titan alloy casting ingot melting shrinkage compensation method according to claim 1 or 6, which is characterized in that the feeding stage
Burn-off rate reduced step by step according to 8 → 5 → 3 → 1 → 0.4 → 0.2 → 0 slope, when reserved weight be 30~50kg, fusing
After speed is 0kg/min, using the electric current of 4~6KA, 80~120min is kept the temperature.
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