CN109402431A - A kind of preparation method of Ti6Al7Nb titan alloy casting ingot - Google Patents
A kind of preparation method of Ti6Al7Nb titan alloy casting ingot Download PDFInfo
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- CN109402431A CN109402431A CN201811556846.8A CN201811556846A CN109402431A CN 109402431 A CN109402431 A CN 109402431A CN 201811556846 A CN201811556846 A CN 201811556846A CN 109402431 A CN109402431 A CN 109402431A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C14/00—Alloys based on titanium
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Abstract
The invention belongs to technical field of nonferrous metal processing, disclose a kind of preparation method of Ti6Al7Nb titan alloy casting ingot, prepared by the Ti6Al7Nb titan alloy casting ingot melting suitable for Φ 560~Φ 720mm specification.This method comprises: first by titanium sponge, AlNbTi alloy, Al beans and TiO2Ingredient is carried out according to proportion required by GB/T3620.1；It is pressed into electrode block after mixing, is prepared as consutrode after electrode block is carried out vacuum plasma welding；Then consutrode is subjected to vacuum consumable arc-melting three times, last time melting is controlled using burn-off rate, later period enters the feeding stage, melting rate reduces step by step, reserving weight in consutrode is 30~60kg, when burn-off rate is 0kg/min, 40~100min of electric current of 4~6kA is kept, pool depth is gradually reduced；Finished product ingot casting is obtained after carrying out surface machining after cooling.
Description
Technical field
The invention belongs to technical field of nonferrous metal processing, and in particular to a kind of preparation side of Ti6Al7Nb titan alloy casting ingot
Method.
Background technique
As human body implantation metal material, other than with good mechanical performance and corrosion resistance, should also have good
Good biocompatibility；Widely used surgical implantation metal material has stainless steel, cobalt-base alloy and titanium alloy three categories.
Currently, Ti6Al7Nb titanium alloy is due to the features such as elasticity modulus is high, processability is good, biocompatibility is excellent,
Pure titanium, Ti6Al4V alloy have gradually been substituted, have been applied in surgical implant field.
However, since segregation-alloy element nb content easy in Ti6Al7Nb alloy is up to 7%, using similar to other routines
The smelting technology of titanium alloy, Nb element are easy to be segregated in ingot casting, not only make the homogeneity of ingredients of ingot casting be deteriorated, also result in
Structural homogenity is poor, mechanical property is not up to standard etc. as a result, it is difficult to meet the clinical application requirement of medical material.
Summary of the invention
The invention reside in the above-mentioned prior art is overcome, a kind of preparation side of Ti6Al7Nb titan alloy casting ingot is provided
Method, by selecting reasonable type of raw materials and formulate reasonable smelting technology parameter, realize big ingot shape Ti6Al7Nb ingot casting at
Point uniformity, yield rate effectively control.
The purpose of the present invention is achieved through the following technical solutions: a kind of preparation side of Ti6Al7Nb titan alloy casting ingot
Method, specifically includes the following steps:
(1) it is equipped with raw material, chooses titanium sponge, AlNbTi alloy, Al beans and TiO2As proportion material, according to GB/
The proportion that T3620.1 is required completes 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 30~40KA of electric current, melting 30~40V of voltage, cooling time is not less than 5 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
Ti6Al7Nb titan alloy casting ingot；
(5) surface is carried out to the Ti6Al7Nb titan alloy casting ingot of step (4) to machine to obtain Ti6Al7Nb titanium alloy finished product
Ingot casting.
Further, it is 3000~6000kg 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 30~
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 uses diameter to control gas leakage in fusion process for the crucible of Φ 560mm
Rate in 1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 30~40KA of electric current, melting 30~40V of voltage, stabilising arc electric current
Using 20~30A direct current, cooling time is not less than 4 hours after melting；
(4.2) second of vacuum consumable arc-melting use the crucible of diameter of phi 640mm, control in fusion process pre- true
Sky in 0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 8~16kg/min of speed of melting, melting 34~45V of voltage, melting
Cooling time is not less than 5 hours afterwards；
(4.3) third time vacuum consumable arc-melting uses the crucible of Φ 720mm, and leak rate is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 8~16kg/min of speed of melting, 34~45V of melting voltage；From power consumption
Feeding is initially entered when pole melting 200~450kg of remaining weight, burn-off rate reduces step by step, reserves weight when consutrode and reaches
To 30~60kg, after speed of melting is 0kg/min, under 4~6KA electric current, 40~100min is kept the temperature, the soaking time is utilized
It is gradually lifted molten bath, cooling time is not less than 5 hours after melting.
Further, the step (5) carries out surface machining to the Ti6Al7Nb titan alloy casting ingot of step (4), specifically
Include:
(5.1) it strips off the skin, detect a flaw to the Ti6Al7Nb titan alloy casting ingot progress surface of the step (4), sawing riser obtains
Ti6Al7Nb titanium alloy finished product ingot casting.
It can be seen that the beneficial effects of the present invention are: Ti6Al7Nb titan alloy casting ingot melting preparation provided by the invention
Method, prepared by the Ti6Al7Nb titan alloy casting ingot melting suitable for Φ 560~Φ 720mm specification, molten using vacuum consumable electric arc
(VAR) method of refining carries out melting, and strict control melting electric current, stabilising arc electric current, melting voltage in fusion process improve alloy of ingot
Change effect and homogeneity of ingredients；It is surplus in last time melting later period consutrode when ingredient total weight is 3000~6000kg
Remaining weight carries out feeding when being 200~450kg, and the feeding stage reduces burn-off rate step by step, after burn-off rate is 0kg/min,
Using the low current of 4~6KA, the soaking time of 40~100min realizes that molten bath is constantly lifted, and pool depth constantly reduces, solution
The problem that Ti6Al7Nb titan alloy casting ingot Nb element segregation of having determined is serious, alloy element component uniformity is poor, yield rate is low, ingot casting
Transverse and longitudinal distributed components, whole ingot yield rate are more than 94%.
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 preparation methods of Ti6Al7Nb titan alloy casting ingot, are suitable for 560~Φ of Φ 720mm specification
Ti6Al7Nb titan alloy casting ingot melting preparation, specifically includes the following steps:
(1) it is equipped with raw material, chooses titanium sponge, AlNbTi alloy, Al beans and TiO2As proportion material, according to GB/
The proportion that T3620.1 is required completes 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 30~40KA of electric current, melting 30~40V of voltage, cooling time is not less than 5 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
Ti6Al7Nb titan alloy casting ingot；
(5) surface is carried out to the Ti6Al7Nb titan alloy casting ingot of step (4) to machine to obtain Ti6Al7Nb 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 3000~
6000kg。
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 30~
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 uses diameter to control gas leakage in fusion process for the crucible of Φ 560mm
Rate in 1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 30~40KA of electric current, melting 30~40V of voltage, stabilising arc electric current
Using 20~30A direct current, cooling time is not less than 4 hours after melting；
(4.2) second of vacuum consumable arc-melting use the crucible of diameter of phi 640mm, control in fusion process pre- true
Sky in 0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 8~16kg/min of speed of melting, melting 34~45V of voltage, melting
Cooling time is not less than 5 hours afterwards；
(4.3) third time vacuum consumable arc-melting uses the crucible of Φ 720mm, and leak rate is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 8~16kg/min of speed of melting, 34~45V of melting voltage；From power consumption
Feeding is initially entered when pole melting 200~450kg of remaining weight, burn-off rate reduces step by step, reserves weight when consutrode and reaches
To 30~60kg, after speed of melting is 0kg/min, under 4~6KA electric current, 40~100min is kept the temperature, the soaking time is utilized
It is gradually lifted molten bath, cooling time is not less than 5 hours after melting.
Further, the step (5) carries out surface machining to the Ti6Al7Nb titan alloy casting ingot of step (4), specifically
Include:
(5.1) it strips off the skin, detect a flaw to the Ti6Al7Nb titan alloy casting ingot progress surface of the step (4), sawing riser obtains
Ti6Al7Nb titanium alloy finished product ingot casting.
Embodiment 2:
The present invention also provides a kind of preparation methods of Ti6Al7Nb titan alloy casting ingot, are suitable for 560~Φ of Φ 720mm and advise
It is prepared by the Ti6Al7Nb titan alloy casting ingot melting of lattice, specifically includes the following steps:
(1) it is equipped with raw material: by the titanium sponge of national standard, AlNbTi alloy, Al beans and TiO2According to Ti-6Al-7Nb-
0.11O proportion carries out ingredient, and ingredient total weight is 5500kg；
(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 uses diameter to control leak rate in fusion process for the crucible of Φ 560mm
In 1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 30~40KA of electric current, melting 30~40V of voltage, stabilising arc electric current are adopted
With 20~30A direct current, cooling time is not less than 4 hours after melting；
Second of vacuum consumable arc-melting uses the crucible of diameter of phi 640mm, and forevacuum is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 14~15kg/min of speed of melting, melting voltage 34~40V is cold after melting
But the time is not less than 5 hours；
Third time vacuum consumable arc-melting uses the crucible of Φ 720mm, and leak rate is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 3.0Pa hereinafter, 12~15kg/min of speed of melting, melting 34~45V of voltage, from power consumption
Feeding is initially entered when pole melting remaining weight 300kg, burn-off rate reduces step by step, reserves weight when consutrode and reaches
30kg after burn-off rate is 0kg/min, under 4~6KA electric current, keeps 70min, is gradually lifted molten bath using the soaking time,
Cooling time is not less than 5 hours after melting；
(5) surface is carried out to the Ti6Al7Nb titan alloy casting ingot of step (4) to machine to obtain Ti6Al7Nb titanium alloy finished product
Ingot casting, detect a flaw sawing riser weight 110kg, and riser proportion is 2.00%, considers weight 96kg to be worth doing, and proportion 1.75% is comprehensive
Composite rate reaches 94.0%.
In addition, in order to verify whether the Ti6Al7Nb titanium alloy finished product ingot casting of preparation method preparation meets the requirements of the standard,
The Φ 720mm ingot casting that melting in embodiment 2 is obtained carries out nine point 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, 9 sampling results
Longitudinal 5 sampling results of 2 ingot casting surface of table
As can be seen from Table 1: laterally 9 homogeneity of ingredients are good at resulting Ti6Al7Nb ingot casting riser position, host element
For deviation within 2000ppm, O element deviation is 100ppm.
As can be seen from Table 2: resulting Ti6Al7Nb ingot casting longitudinal direction homogeneity of ingredients is good, and host element and impurity element are equal
It meets the requirements of the standard.
Embodiment 3:
The present invention also provides a kind of preparation methods of Ti6Al7Nb titan alloy casting ingot, are suitable for 560~Φ of Φ 720mm and advise
It is prepared by the Ti6Al7Nb titan alloy casting ingot melting of lattice, specifically includes the following steps:
(1) it is equipped with raw material: by the titanium sponge of national standard, AlNbTi alloy, Al beans and TiO2According to Ti-6Al-7Nb-
0.11O proportion carries out ingredient, and ingredient total weight is 5000kg；
(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 uses diameter to control leak rate in fusion process for the crucible of Φ 560mm
In 1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 32~36KA of electric current, melting 30~40V of voltage, stabilising arc electric current are adopted
With 20~24A direct current, cooling time is not less than 4 hours after melting；
Second of vacuum consumable arc-melting uses the crucible of diameter of phi 640mm, and forevacuum is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 13~15kg/min of speed of melting, melting voltage 36~40V is cold after melting
But the time is not less than 5 hours；
Third time vacuum consumable arc-melting uses the crucible of Φ 720mm, and leak rate is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 3.0Pa hereinafter, 10~14kg/min of speed of melting, melting 35~40V of voltage, from power consumption
Feeding is initially entered when pole melting remaining weight 300kg, burn-off rate reduces step by step, reserves weight when consutrode and reaches
30kg after burn-off rate is 0kg/min, under 4~6KA electric current, keeps 70min, is gradually lifted molten bath using the soaking time,
Cooling time is not less than 5 hours after melting；
(5) surface is carried out to the Ti6Al7Nb titan alloy casting ingot of step (4) to machine to obtain Ti6Al7Nb titanium alloy finished product
Ingot casting, detect a flaw sawing riser weight 76kg, and riser proportion is 1.52%, considers weight 81kg to be worth doing, and proportion 1.62% is comprehensive
Yield rate reaches 95.2%.
In addition, in order to verify whether the Ti6Al7Nb titanium alloy finished product ingot casting of preparation method preparation meets the requirements of the standard,
The Φ 720mm ingot casting that melting in embodiment 3 is obtained carries out nine point 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, 9 sampling results
| Position | Al | Nb | O |
| 1 | 5.89 | 6.87 | 0.09 |
| 2 | 5.92 | 6.90 | 0.10 |
| 3 | 5.93 | 6.82 | 0.10 |
| 4 | 5.88 | 6.85 | 0.09 |
| 5 | 5.90 | 6.87 | 0.09 |
| 6 | 5.82 | 6.90 | 0.09 |
| 7 | 5.79 | 6.86 | 0.10 |
| 8 | 5.83 | 6.90 | 0.09 |
| 9 | 5.85 | 6.88 | 0.10 |
Longitudinal 5 sampling results of 4 ingot casting surface of table
As can be seen from Table 3: laterally 9 homogeneity of ingredients are good at resulting Ti6Al7Nb ingot casting riser position, host element
For deviation within 2000ppm, O element deviation is 100ppm.
As can be seen from Table 4: resulting Ti6Al7Nb ingot casting longitudinal direction homogeneity of ingredients is good, and host element and impurity element are equal
It meets the requirements of the standard.
Embodiment 4:
The present invention also provides a kind of preparation methods of Ti6Al7Nb titan alloy casting ingot, are suitable for 560~Φ of Φ 720mm and advise
It is prepared by the Ti6Al7Nb titan alloy casting ingot melting of lattice, specifically includes the following steps:
(1) it is equipped with raw material: by the titanium sponge of national standard, AlNbTi alloy, Al beans and TiO2According to Ti-6Al-7Nb-
0.11O proportion carries out ingredient, and ingredient total weight is 4600kg；
(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 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 uses diameter to control leak rate in fusion process for the crucible of Φ 560mm
In 1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 34~38KA of electric current, melting 30~40V of voltage, stabilising arc electric current are adopted
With 28~30A direct current, cooling time is not less than 4 hours after melting；
Second of vacuum consumable arc-melting uses the crucible of diameter of phi 640mm, and forevacuum is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 12~15kg/min of speed of melting, melting voltage 34~40V is cold after melting
But the time is not less than 5 hours；
Third time vacuum consumable arc-melting uses the crucible of Φ 720mm, and leak rate is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 2.0Pa hereinafter, 13~16kg/min of speed of melting, melting 34~42V of voltage, from power consumption
Feeding is initially entered when pole melting remaining weight 400kg, burn-off rate reduces step by step, reserves weight when consutrode and reaches
40kg after burn-off rate is 0kg/min, under 4~6KA electric current, keeps 90min, is gradually lifted molten bath using the soaking time,
Cooling time is not less than 5 hours after melting.
(5) surface is carried out to the Ti6Al7Nb titan alloy casting ingot of step (4) to machine to obtain Ti6Al7Nb titanium alloy finished product
Ingot casting, detect a flaw sawing riser weight 91kg, and riser proportion is 1.98%, considers weight 85kg to be worth doing, and proportion 1.85% is comprehensive
Yield rate reaches 95.1%.
In order to verify whether the Ti6Al7Nb titanium alloy finished product ingot casting of preparation method preparation meets the requirements of the standard, will implement
The Φ 720mm ingot casting that example 4 obtains carries out sampling in 9 o'clock, the longitudinal 5 points of samplings minute of ingot casting surface to its casting head transversal cross-section
Analysis ingot casting entirety ingredient uniformity results are shown in Table 5 and table 6:
Table 5 casting head transversal cross-section, 9 sampling results
| Position | Al | Nb | O |
| 1 | 5.90 | 6.88 | 0.09 |
| 2 | 5.83 | 6.82 | 0.10 |
| 3 | 5.92 | 6.87 | 0.09 |
| 4 | 5.87 | 6.92 | 0.10 |
| 5 | 5.83 | 6.90 | 0.10 |
| 6 | 5.89 | 6.88 | 0.10 |
| 7 | 5.82 | 6.86 | 0.09 |
| 8 | 5.89 | 6.83 | 0.10 |
| 9 | 5.90 | 6.85 | 0.10 |
Longitudinal 5 sampling results of 6 ingot casting surface of table
As can be seen from Table 5: laterally 9 homogeneity of ingredients are good at resulting Ti6Al7Nb ingot casting riser position, host element
For deviation within 2000ppm, O element deviation is 100ppm.
As can be seen from Table 6: resulting Ti6Al7Nb ingot casting longitudinal direction homogeneity of ingredients is good, and host element and impurity element are equal
It meets the requirements of the standard.
Further, the present invention is the homogeneity of ingredients for preventing ingot casting Nb segregation, guaranteeing ingot casting, selects the high-quality titanium sponge to be
Basis and AlNbTi alloy, Al beans, TiO2Mixing material is carried out, the main component scope control of ingot casting is in GB/T3620.1 model
In enclosing.By cloth and mixing, the uniformity of raw material in the electrodes is realized；Compacting pressure control ensure that in 30~38MPa
The consistency of electrode block under big alloy addition level.
In addition, the welding that the present invention carries out electrode by the way of vacuum plasma welding is consutrode weldering in order to prevent
Connect oxidation, it is ensured that enough weld strengths；Melting three times, fusion process are carried out using vacuum consumable arc-melting (VAR) method
Middle strict control vacuum degree, leak rate, melting electric current, stabilising arc electric current and melting voltage, pill heat strict control melting electric current and
Stabilising arc electric current, three times melting strict control speed of melting, feeding time improve the alloying effect and member of alloying element in ingot casting
Plain distribution uniformity degree is obtained compared with high finished product rate.
To sum up, Ti6Al7Nb titan alloy casting ingot smelting preparation method disclosed by the invention is suitable for 560~Φ of Φ 720mm
It is prepared by the Ti6Al7Nb titan alloy casting ingot melting of specification, solve Ti6Al7Nb titan alloy casting ingot yield rate is low, casting head at
The problem of dividing poor uniformity, segregation, yield rate is more than 94%, and casting head ingredient is uniform.Al, Nb host element transverse and longitudinal
It is very poor very poor no more than 2000ppm, O element transverse and longitudinal no more than 200ppm to ingredient.
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 (7)
1. a kind of preparation method of Ti6Al7Nb titan alloy casting ingot, which is characterized in that specifically includes the following steps:
(1) it is equipped with raw material, chooses titanium sponge, AlNbTi alloy, Al beans and TiO2As proportion material, wanted according to GB/T3620.1
The proportion asked completes 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 30~40KA of electric current, melting 30~40V of voltage, cooling time is not less than 5 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 Ti6Al7Nb titanium
Alloy cast ingot；
(5) surface is carried out to the Ti6Al7Nb titan alloy casting ingot of step (4) to machine to obtain Ti6Al7Nb titanium alloy finished product ingot casting.
2. the preparation method of Ti6Al7Nb titan alloy casting ingot according to claim 1, which is characterized in that the step (1)
The ingredient total weight for being equipped with raw material is 3000~6000kg.
3. the preparation method of Ti6Al7Nb titan alloy casting ingot 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 30~
38Mpa。
4. the preparation method of Ti6Al7Nb titan alloy casting ingot according to claim 3, which is characterized in that the step
(2.2) hydraulic press in selects 8000t hydraulic press.
5. the preparation method of Ti6Al7Nb titan alloy casting ingot according to claim 1, which is characterized in that the step (3)
In the welding of electrode block is welded using vacuum plasma.
6. the preparation method of Ti6Al7Nb titan alloy casting ingot 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 uses diameter for the crucible of Φ 560mm, and leak rate is controlled in fusion process and is existed
1.2Pa/min hereinafter, vacuum degree in 5.0Pa hereinafter, melting 30~40KA of electric current, melting 30~40V of voltage, stabilising arc electric current uses
20~30A direct current, cooling time is not less than 3 hours after melting；
(4.2) second of vacuum consumable arc-melting use the crucible of diameter of phi 640mm, control forevacuum in fusion process and exist
0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 8~16kg/min of speed of melting, melting voltage 34~45V is cold after melting
But the time is not less than 5 hours；
(4.3) third time vacuum consumable arc-melting uses the crucible of Φ 720mm, and leak rate is controlled in fusion process and is existed
0.8Pa/min hereinafter, vacuum degree in 4.0Pa hereinafter, 34~45V of melting voltage；Consumable electrode melting remaining weight 200~
Feeding is initially entered when 450kg, burn-off rate reduces step by step, reserves weight when consutrode and reaches 30~60kg, speed of melting
After 0kg/min, under 4~6KA electric current, 40~100min is kept the temperature, molten bath is gradually lifted using the soaking time, after melting
Cooling time is not less than 5 hours.
7. the preparation method of Ti6Al7Nb titan alloy casting ingot according to claim 1, which is characterized in that the step (5)
Surface machining is carried out to the Ti6Al7Nb titan alloy casting ingot of step (4), is specifically included:
(5.1) it strips off the skin, detect a flaw to the Ti6Al7Nb titan alloy casting ingot progress surface of the step (4), sawing riser obtains
Ti6Al7Nb titanium alloy finished product ingot casting.
Priority Applications (1)
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| CN110904341A (en) * | 2019-12-04 | 2020-03-24 | 西部超导材料科技股份有限公司 | Cooling method of titanium alloy ingot |
| CN111014877A (en) * | 2019-12-03 | 2020-04-17 | 西部超导材料科技股份有限公司 | Method for welding titanium alloy ingot casting in furnace |
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| CN111575510A (en) * | 2020-05-18 | 2020-08-25 | 西部超导材料科技股份有限公司 | Method for preparing TC25 titanium alloy ingot and ingot prepared by method |
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