CN108570577A - A kind of high strength titanium alloy silk material preparation method - Google Patents
A kind of high strength titanium alloy silk material preparation method Download PDFInfo
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- CN108570577A CN108570577A CN201810431403.XA CN201810431403A CN108570577A CN 108570577 A CN108570577 A CN 108570577A CN 201810431403 A CN201810431403 A CN 201810431403A CN 108570577 A CN108570577 A CN 108570577A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/047—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire of fine wires
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
The invention belongs to materials science fields, are related to a kind of high strength titanium alloy silk material preparation method.Titanium alloy component used and mass percent are:Al:6.3~7;Mo:3.5~4.5;V:5.5~6.5;Nb:1.5~2.5;Fe:0.5~1.5;C≤0.05;O≤0.13;N≤0.05;H≤0.015;Ti- surpluses.The present invention keeps the alloy of higher plasticity and toughness when using higher intensity, transformation temperature above and below temperature is used alternatingly in ingot formation and the operation of rolling, ensure that original grain is fully crushed, tissue is more uniformly tiny, more conducively obtains high-performance silk material.Do not have to special annealing process in whole process, and continuous rolling may be used below transformation temperature or melt down and roll again, simplify technique, shorten the period and reduces cost.Another processed silk material passes through defined heat treatment, can obtain tensile strength and be more than 1500MPa, elongation percentage is more than 8%, and cutting performance is more than the Good All-around Property of 950MPa.
Description
Technical field
The invention belongs to materials science fields, are related to a kind of high strength titanium alloy silk material preparation method.
Background technology
In order to meet aircraft loss of weight, reduce energy consumption, raising resistance to corrosion and excellent with carbon fibre composite
Needs with directions such as property, titanium alloy fastener have become advanced seating plane and the essential crucial connection of military aircraft
Part.Under same intensity index, titanium alloy fastener is lighter than steel fastener by 30%~40%, and an airplane fastener makes
For dosage in hundreds of thousands or even up to a million, weight loss effect is considerable.Currently, TC4 titanium alloy fasteners are domestic and international military-civil aircrafts
It is upper it is most widely used, dosage is maximum, uses most reliable titanium alloy fastener.With large aircrafts such as Boeing 787, Air Passenger A380
Success is researched and developed and operation, the titanium alloy fastener of high loadability are increasingly taken seriously, and dosage is also increasing.Due to TC4
For the alpha-beta type diphasic titanium alloy of moderate strength, and restricted by quenching degree, the intensity after TC4 titanium alloy rod bar solid solution agings
Surplus very little can not fully meet the requirement of fastener high bearing capacity.Therefore, the titanium alloy of higher intensity performance is developed
Fastener becomes various countries' research hotspot, wherein the titanium alloy wire materials for preparing high-intensity fasteners are primary keys.
A large amount of correlative study work have been carried out in active demand for titanium alloy fastener both at home and abroad, wherein the ratio of exploitation
Relatively successfully middle high strength titanium alloy fastener selects alloy and performance indicator to be shown in Table 1.By table as it can be seen that currently, answering extensively
For fastener strength mainly in 1100MPa ranks, TB8 titanium alloy fasteners are that the high strength titanium alloy fastener of exploitation is typical
It represents, reaches 1250MPa ranks, this intensity rank can not also fully meet the demand to more high bearing capacity.In titanium alloy
As the increase of intensity, titanium alloy plasticity will be decreased obviously in silk material preparation, follow-up fastener forming can more difficult, screw thread table
Face easily forms the defects of burr, and surface integrity is difficult to ensure.In addition, due to loading characteristic shear resistant in fastener use
It can be an important indicator of examination.Therefore, how to prepare higher intensity while keeping good plasticity and cutting performance
Titanium alloy wire materials become technical barrier.
1 titanium alloy for fastening piece of table and the key technical indexes
Note:M- annealed states;STA- solid solution aging states;ST- is dissolved state
Invention content
A kind of novel high-strength titanium that the purpose of the present invention is developed aiming at high strength titanium alloy fastener demand closes
Spun gold material preparation method.Technical solution of the invention is that the alloy compositions are:
Al:6.3~7;Mo:3.5~4.5;V:5.5~6.5;Nb:1.5~2.5;Fe:0.5~1.5;C≤0.05;O≤
0.13;N≤0.05;H≤0.015;Ti- surpluses, concrete technology flow process are as follows:
(1) it is heated in 1150 DEG C of ± 10 DEG C of temperature ranges, soaking time is calculated with 0.5min/mm~0.8min/mm, will be melted
The titan alloy casting ingot of refining carries out the cogging forging that no less than two upsettings two are pulled out, and is processed into forging stick;
(2) it is heated in 1000 DEG C of ± 10 DEG C of temperature ranges, soaking time is calculated with 0.5min/mm~0.8min/mm, will be forged
Stick carries out the forging that no less than two upsettings two are pulled out;
(3) by forging stick by removal face crack and the folding of stripping off the skin, one end rounded corner, in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature
Section is kept the temperature, and soaking time is calculated with 0.6min/mm~1.0min/mm, and bar is carried out two passage hot rolling deformations, finish to gauge
It is directly melted down in T if temperature is less than 720 DEG C after a time rolling deformation temperature >=720 DEG Cβ- 50 DEG C~Tβ- 30 DEG C of temperature
Degree section is kept the temperature, and soaking time is calculated with 0.3min/mm~0.5min/mm;
(4) in Tβ+ 5 DEG C~Tβ+ 10 DEG C of heating, soaking time are calculated with 0.5min/mm~0.8min/mm, will roll stick progress
A time hot rolling deformation;
(5) in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature ranges are kept the temperature, and soaking time is in terms of 0.6min/mm~1.0min/mm
It calculates, stick will be rolled and carry out multi- pass rolling, finishing temperature >=720 DEG C, if when temperature before reaching prescribed requirement size is less than 720 DEG C
Directly melt down in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature ranges are kept the temperature, and soaking time is calculated with 0.3min/mm~0.5min/mm,
Until reaching the size finally required;
(6) silk material will be rolled in Tβ- 70 DEG C~TβSolution treatment is carried out in -30 DEG C of temperature ranges, then again 500 DEG C~
550 DEG C of temperature ranges carry out ageing treatment, obtain titanium alloy wire materials.
The titanium alloy wire materials are used to prepare firm part.
The present invention has the advantage that and advantageous effect
Present invention process uses alloy Al percentages for 6.3~7, has the higher equivalent thickness of aluminium, while using Mo, V and Nb
Ternary isomorphism beta stable element is strengthened, and higher plasticity and toughness are kept when obtaining higher intensity.In ingot formation and roll
Transformation temperature above and below temperature is used alternatingly during system, ensures that original grain is fully crushed, tissue is more even and fine
It is small, more conducively obtain high-performance silk material.Do not have to special annealing process in whole process, and may be used below transformation temperature
Continuous rolling or melt down rolls again, simplifies technique, shortens the period and reduces cost.Another processed silk material is passed through at defined heat
Reason can obtain tensile strength and be more than 1500MPa, and elongation percentage is more than 8%, and cutting performance is excellent comprehensive more than 950MPa's
Energy.
Specific implementation mode
The alloy compositions are:Al:6.3~7;Mo:3.5~4.5;V:5.5~6.5;Nb:1.5~2.5;Fe:0.5~
1.5;C≤0.05;O≤0.13;N≤0.05;H≤0.015;Ti- surpluses.Aluminium content is improved, while using ternary isomorphism β
Stable element keeps higher plasticity and toughness when obtaining higher intensity.A kind of titanium alloy wire is developed according to this alloy feature
Material preparation process.
(1) it is heated in 1150 DEG C of ± 10 DEG C of temperature ranges, soaking time is calculated with 0.5min/mm~0.8min/mm, will be melted
The titan alloy casting ingot of refining carries out the cogging forging that no less than two upsettings two are pulled out, and is processed into forging stick;
(2) it is heated in 1000 DEG C of ± 10 DEG C of temperature ranges, soaking time is calculated with 0.5min/mm~0.8min/mm, will be forged
Stick carries out the forging that no less than two upsettings two are pulled out;
(3) by forging stick by removal face crack and the folding of stripping off the skin, one end rounded corner, in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature
Section is kept the temperature, and soaking time is calculated with 0.6min/mm~1.0min/mm, and bar is carried out two passage hot rolling deformations, finish to gauge
It is directly melted down in T if temperature is less than 720 DEG C after a time rolling deformation temperature >=720 DEG Cβ- 50 DEG C~Tβ- 30 DEG C of temperature
Degree section is kept the temperature, and soaking time is calculated with 0.3min/mm~0.5min/mm;
(4) in Tβ+ 5 DEG C~Tβ+ 10 DEG C of heating, soaking time are calculated with 0.5min/mm~0.8min/mm, will roll stick progress
A time hot rolling deformation;
(5) in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature ranges are kept the temperature, and soaking time is in terms of 0.6min/mm~1.0min/mm
It calculates, a time rolling is carried out to rolling stick, if finishing temperature is not less than 720 DEG C, can directly carry out second rolling, repeatedly may be used
Multi- pass rolling is carried out, until reaching prescribed requirement size.Wherein when if temperature before reaching prescribed requirement size is less than 720 DEG C
It can directly melt down in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature ranges are kept the temperature, and soaking time is in terms of 0.3min/mm~0.5min/mm
It calculates, continues rolling until reaching the size finally required;
(6) silk material will be rolled in Tβ- 70 DEG C~TβSolution treatment is carried out in -30 DEG C of temperature ranges, then again 500 DEG C~
550 DEG C of temperature ranges carry out ageing treatment, obtain titanium alloy wire materials.
The titanium alloy wire materials are used to prepare firm part.
Embodiment 1
The ingot casting of φ 230mm is prepared using vacuum consumable smelting technique three times.Ingot casting ingredient is shown in Table 2.Through surveying phase
Height TβIt is 868 DEG C.
2 alloy upper, middle and lower chemical composition analysis result of table
Al | V | Mo | Nb | Fe | C | O | N | H | |
On | 6.52 | 5.97 | 3.9 | 1.99 | 1.08 | 0.01 | 0.06 | 0.007 | 0.0005 |
In | 6.64 | 5.93 | 3.95 | 2.06 | 0.99 | 0.01 | 0.07 | 0.008 | 0.0005 |
Under | 6.68 | 6.01 | 3.8 | 1.93 | 0.99 | 0.01 | 0.10 | 0.006 | 0.0005 |
By ingot casting in 1150 DEG C of heating and thermal insulations, soaking time is calculated as 140min according to 0.6min/mm, and two are carried out to ingot casting
Upsetting two is pulled out, and pulling is chamfered edge, round as a ball to Φ 220mm ± 10mm, air-cooled.Will forging stick in 1000 DEG C of heating and thermal insulations, soaking time according to
0.6min/mm is calculated as 130min, and carrying out two upsettings two to forging stick pulls out, and pulling is chamfered edge, round as a ball to Φ 180mm ± 10mm, air-cooled.
Forging stick is stripped off the skin, removes surface forging defect, the fillet of falling R20.Forging stick will be stripped off the skin in TβHeating is protected at -38 DEG C i.e. 830 DEG C
Temperature, soaking time are calculated as 130min according to 0.7min/mm.Twice time rolling is carried out on three roller screw rolling mills, from Φ 180mm
Φ 140mm are rolled, then are rolled from Φ 140mm to Φ 110mm, it is air-cooled.Stick will be rolled in Tβ+ 10 DEG C i.e. 878 DEG C of heating and thermal insulations, when heat preservation
Between according to 0.6min/mm be calculated as 66min.It is rolled from Φ 110mm to Φ 80mm on three roller screw rolling mills, it is air-cooled.Stick will be rolled to exist
TβHeating and thermal insulation at -38 DEG C i.e. 830 DEG C, soaking time is calculated as 56min according to 0.7min/mm, enterprising in three roller screw rolling mills
Row multi- pass rolling, Φ 80mm- Φ 50mm- Φ 30mm- Φ 23mm- Φ 18mm- Φ 13mm- Φ 8mm, during which when temperature is less than
At 720 DEG C, carry out melting down heat preservation, soaking time is calculated by 0.5min/mm, final to roll a diameter of Φ 8mm of silk material.Silk material is pressed
According to 800 DEG C, 2h ,+540 DEG C, 6h of water cooling, air-cooled heat treating regime carries out fixation rates, measures silk material performance and is shown in Table 3 institutes
Show.
3 Φ 8mm silk material tensile properties of table
Number | σb/MPa | δ5/ % | Ψ/% | τ/MPa |
1 | 1543 | 10.2 | 23.3 | 1024 |
2 | 1537 | 9.8 | 20.6 | 996 |
3 | 1558 | 11.4 | 21.2 | 985 |
Embodiment 2
The ingot casting of φ 360mm is prepared using vacuum consumable smelting technique three times.Ingot casting ingredient is shown in Table 4.Through surveying phase
Height TβIt is 863 DEG C.
4 alloy upper, middle and lower chemical composition analysis result of table
By ingot casting in 1150 DEG C of heating and thermal insulations, soaking time is calculated as 290min according to 0.8min/mm, and two are carried out to ingot casting
Upsetting two is pulled out, and pulling is chamfered edge, round as a ball to Φ 270mm ± 10mm, air-cooled.Will forging stick in 1000 DEG C of heating and thermal insulations, soaking time according to
0.8min/mm is calculated as 220min, and carrying out two upsettings two to forging stick pulls out, and pulling is chamfered edge, round as a ball to Φ 190mm ± 10mm, air-cooled.
Forging stick is stripped off the skin, removes surface forging defect, the fillet of falling R20.Forging stick will be stripped off the skin in TβHeating is protected at -43 DEG C i.e. 820 DEG C
Temperature, soaking time are calculated as 190min according to 1.0min/mm.A time rolling is carried out on three roller screw rolling mills, from Φ 190mm
Roll Φ 140mm.Melt down soaking time and 42min be calculated as with 0.3min/mm, then carry out a time rolling, from Φ 140mm roll to
Φ 90mm, it is air-cooled.Stick will be rolled in Tβ+ 5 DEG C i.e. 868 DEG C of progress heating and thermal insulations, soaking time is calculated as according to 0.8min/mm
72min.It is rolled from Φ 90mm to Φ 60mm on three roller screw rolling mills, it is air-cooled.Stick will be rolled in TβHeating is protected at -43 DEG C i.e. 820 DEG C
Temperature, soaking time are calculated as 60min according to 1.0min/mm, and multi- pass rolling, Φ 60mm- Φ 40mm- are carried out on three-high mill
Φ 27mm- Φ 23mm- Φ 19mm- Φ 15mm carry out melting down heat preservation, soaking time is pressed during which when temperature is less than 720 DEG C
0.4min/mm is calculated, final to roll a diameter of Φ 15mm of silk material.By silk material according to 815 DEG C, 2h ,+530 DEG C, 6h of water cooling is air-cooled
Heat treating regime carry out fixation rates, measure silk material performance be shown in Table 5.
5 Φ 15mm silk material tensile properties of table
Number | σb/MPa | δ5/ % | Ψ/% | τ/MPa |
4 | 1573 | 9.6 | 23.7 | 979 |
5 | 1589 | 8.8 | 23.3 | 1016 |
6 | 1556 | 11.3 | 24.6 | 973 |
Above-mentioned 2 embodiments fully prove the creativeness and stability of present invention process.The present invention is created by alloying component
New and process innovation, makes high strength titanium alloy silk material reach excellent comprehensive performance, further to prepare high strength titanium alloy
Fastener provides technical support.
Claims (2)
1. a kind of high strength titanium alloy silk material preparation method, which is characterized in that Al:6.3~7;Mo:3.5~4.5;V:5.5~
6.5;Nb:1.5~2.5;Fe:0.5~1.5;C≤0.05;O≤0.13;N≤0.05;H≤0.015;Ti- surpluses, the titanium
Alloy wire ingredient and mass percent are:Its concrete technology flow process is as follows:
(1) it is heated in 1150 DEG C of ± 10 DEG C of temperature ranges, soaking time is calculated with 0.5min/mm~0.8min/mm, by melting
Titan alloy casting ingot carries out the cogging forging that no less than two upsettings two are pulled out, and is processed into forging stick;
(2) heated in 1000 DEG C of ± 10 DEG C of temperature ranges, soaking time is calculated with 0.5min/mm~0.8min/mm, will forging stick into
Row is no less than the forging that two upsettings two are pulled out;
(3) by forging stick by removal face crack and the folding of stripping off the skin, one end rounded corner, in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature ranges
It is kept the temperature, soaking time is calculated with 0.6min/mm~1.0min/mm, and bar is carried out two passage hot rolling deformations, finishing temperature
It >=720 DEG C, if temperature is less than 720 DEG C after a time rolling deformation, directly melts down in Tβ- 50 DEG C~Tβ- 30 DEG C of humidity provinces
Between kept the temperature, soaking time with 0.3min/mm~0.5min/mm calculate;
(4) in Tβ+ 5 DEG C~Tβ+ 10 DEG C of heating, soaking time are calculated with 0.5min/mm~0.8min/mm, will be rolled stick and are carried out together
Secondary hot rolling deformation;
(5) in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature ranges are kept the temperature, and soaking time is calculated with 0.6min/mm~1.0min/mm,
Stick will be rolled and carry out multi- pass rolling, finishing temperature >=720 DEG C, if straight when temperature before reaching prescribed requirement size is less than 720 DEG C
Stove is taken back in Tβ- 50 DEG C~Tβ- 30 DEG C of temperature ranges are kept the temperature, and soaking time is calculated with 0.3min/mm~0.5min/mm, directly
To reaching the size finally required;
(6) silk material will be rolled in Tβ- 70 DEG C~TβSolution treatment is carried out in -30 DEG C of temperature ranges, then again at 500 DEG C~550 DEG C
Temperature range carries out ageing treatment, obtains titanium alloy wire materials.
2. a kind of high strength titanium alloy silk material preparation method according to claim 1, which is characterized in that the titanium alloy wire
Material is used to prepare firm part.
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