CN108856941B - Composite solder and method for brazing TC4 titanium alloy by using same - Google Patents
Composite solder and method for brazing TC4 titanium alloy by using same Download PDFInfo
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- CN108856941B CN108856941B CN201810931960.8A CN201810931960A CN108856941B CN 108856941 B CN108856941 B CN 108856941B CN 201810931960 A CN201810931960 A CN 201810931960A CN 108856941 B CN108856941 B CN 108856941B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
- B23K35/325—Ti as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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Abstract
The invention discloses a composite solder and a method for brazing TC4 titanium alloy by using the same. A brazing filler metal comprising: ti30‑40Zr24‑33Mo5‑ 10Cu7‑18Be13‑23(ii) a Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti13‑26Zr26‑36Mo1.5‑2.5Cu10‑12Be24‑44(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti34‑67Zr12‑40Mo7.5‑18.5Cu2‑26Be2‑20The volume fraction of the reinforcing phase is 50%. A brazing method comprises the following steps: with Ti30‑40Zr24‑ 33Mo5‑10Cu7‑18Be13‑23The TC4 titanium alloy was brazed as a brazing filler metal. The invention has the beneficial effects that: has good brazing performance.
Description
Technical Field
The invention relates to the field of brazing, in particular to a composite brazing filler metal and a method for brazing TC4 titanium alloy by using the same.
Background
The TC4 is the titanium alloy which is most widely used at present, has a (α + β) two-phase structure and excellent mechanical properties, and the performance matching of the strength, the plasticity, the damage tolerance and the like of the titanium alloy is better to be widely applied to the fields of aerospace, biomedicine, new energy, information industry and the like.
The common crystalline brazing filler metal is an eutectic or near-eutectic component, is mostly composed of brittle elements, needs a brazing flux and is easy to generate defects at high temperature; and due to supercooling, the microstructure is dominated by dendrites and is accompanied by segregation, which severely deteriorates the strength, especially the ductility and toughness of the joint.
Compared with the crystalline brazing filler metal, the amorphous brazing filler metal has uniform chemical components, and melting and spreading are almost completed simultaneously in the brazing process, so that brazing seam tissues are uniform, and the joint performance is improved. Therefore, amorphous solders have become a very important research direction in the field of material soldering. At present, the amorphous brazing filler metal commonly used for the brazing of TC4 alloy is Ti37.5Zr37.5Ni10Cu15Although the joint is firm, the performance is improved compared with that of direct welding and crystalline solder welding of TC4 titanium alloy, but the brittleness is still larger. This is because, although the amorphous alloy has excellent mechanical properties such as high elastic limit, high strength, and high hardness, its plastic deformation is essentially a non-uniform flow of a high-density local shear band due to the absence of crystal grains and grain boundaries, and the material will rapidly expand along a certain main shear band until fracture occurs without constraint, resulting in that it shows substantially no plastic deformation characteristics macroscopically, does not have room-temperature macroscopic plastic deformation capability, and may undergo catastrophic fracture without indication. Therefore, the use of amorphous solders still does not enable the properties of the soldered joints to be completely matched with the base material.
The Chinese patent ZL201410773318.3 & lt & ltA high-strength and high-toughness dendritic crystal reinforced titanium-based metal glass composite & gt discloses a high-strength and high-toughness dendritic crystal reinforced titanium-based metal glass composite, which has a reinforcing phase inside, can block the rapid expansion of a single shear zone in an amorphous matrix, but unfortunately can not promote the proliferation of multiple shear zones, so that the stress is redistributed, and the aims of delaying the final fracture of the material and improving the plasticity of an amorphous alloy are fulfilled.
Therefore, a brazing material and a brazing method thereof capable of promoting the multiplication of multiple shear bands, so as to redistribute stress and further improve the performance of a TC4 titanium alloy welded joint are key to the problem solving.
Disclosure of Invention
The invention aims to provide a composite brazing filler metal which has good stress distribution.
Still another object of the present invention is to provide a method for brazing TC4 titanium alloy with the composite brazing filler metal, which has good brazing performance.
In order to achieve the purpose, the invention adopts the following technical scheme that the composite solder comprises:
Ti30-40Zr24-33Mo5-10Cu7-18Be13-23；
wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti13- 26Zr26-36Mo1.5-2.5Cu10-12Be24-44(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti34-67Zr12-40Mo7.5-18.5Cu2-26Be2-20The volume fraction of the reinforcing phase is 50%.
Preferably, the atomic percentage expression is:
Ti32Zr27Mo8Cu13Be20；
wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti20Zr29Mo2Cu11Be38(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti44Zr25Mo14Cu15Be2The volume fraction of the reinforcing phase is 50%.
A method of composite braze brazing a TC4 titanium alloy, comprising:
a. adding the Ti30-40Zr24-33Mo5-10Cu7-18Be13-23(ii) a Melting the composite solder to obtain molten liquid, and obtaining composite amorphous powder by using a gas atomization method;
b. spraying the composite amorphous powder to the end face to be connected by a cold spraying method, wherein the spraying thickness is 5-15 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing is carried out at the temperature of 900-930 ℃, and heat preservation is carried out for 15-25 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time;
in the step a, the matrix phase in the composite solder is titanium-based metal glass, and the atomic percentage expression of the matrix phase is shown as follows; in the composite solder, a matrix phase is titanium-based metal glass, and the atomic percentage expression of the matrix phase is as follows; ti13-26Zr26- 36Mo1.5-2.5Cu10-12Be24-44(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti34-67Zr12-40Mo7.5-18.5Cu2-26Be2-20The volume fraction of the reinforcing phase is 50%.
Preferably, the atomic percentage expression in the composite solder is as follows: ti32Zr27Mo8Cu13Be20；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti20Zr29Mo2Cu11Be38(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti44Zr25Mo14Cu15Be2The volume fraction of the reinforcing phase is 50%.
Preferably, the Ti is used in step a30-40Zr24-33Mo5-10Cu7-18Be13-23The melting temperature of the composite solder is 890-900 ℃, and the time is 2-5 min.
Preferably, in the step a, the gas atomization method is that high-speed gas flow impacts the molten liquid at a frequency of 80-100 KHz and a high speed of 2-2.5 Mach to obtain composite amorphous powder with a diameter of 50-100 μm.
Preferably, the cold spraying method in the step b is performed under the He atmosphere, the gas temperature is 500-600 ℃, and the spraying pressure is 0.6-0.9 MPa.
Preferably, in the step e, the wind speed v is 4-16 m/s, the temperature tau of the cooling air is 12-16 ℃, and the cooling time is 1.5-15 min.
The invention has the beneficial effects that: the brazing filler metal is internally provided with a reinforcing phase, so that the rapid expansion of a single shear band in an amorphous matrix can be hindered, and the multiplication of multiple shear bands can be promoted, so that the stress is redistributed, and the aims of delaying the final fracture of the material and improving the plasticity of the amorphous alloy are fulfilled.
Drawings
FIG. 1 is a metallographic microstructure of a piece of brazing material obtained in example I;
FIG. 2 is a scanning electron micrograph of a brazed part obtained in example I;
FIG. 3 is an EDS line scan of a braze obtained in example I;
Detailed Description
The invention is described in further detail below with reference to the drawings so that those skilled in the art can practice the invention with reference to the description.
Example 1
Ti32Zr27Mo8Cu13Be20；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti20Zr29Mo2Cu11Be38(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti44Zr25Mo14Cu15Be2The volume fraction of the reinforcing phase is 50%.
Example 2
Ti30Zr33Mo7Cu7Be23；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti13Zr36Mo2.5Cu12Be36.5(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti47Zr30Mo11.5Cu2Be9.5The volume fraction of the reinforcing phase is 50%.
Example 3
Ti40Zr24Mo10Cu10Be16；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti26Zr36Mo2Cu12Be24(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti54Zr12Mo18Cu8Be8The volume fraction of the reinforcing phase is 50%.
Example 4
Ti32Zr32Mo5Cu18Be13；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti25.5Zr36Mo2.5Cu12Be24(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti38.5Zr28Mo7.5Cu24Be2The volume fraction of the reinforcing phase is 50%.
Example 5
Ti31Zr24Mo10Cu12Be23；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti24.5Zr36Mo1.5Cu12Be26(ii) a The reinforcing phase is composed ofThe titanium-based dendrite with the body-centered cubic structure has the atomic percentage expression as follows: ti37.5Zr12Mo18.5Cu12Be20The volume fraction of the reinforcing phase is 50%.
Example 6
Ti30Zr24Mo5Cu18Be23；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti18Zr26.5Mo1.5Cu10Be44(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti42Zr21.5Mo8.5Cu26Be2The volume fraction of the reinforcing phase is 50%.
Example 7
Ti33Zr33Mo5Cu9Be20；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti21.5Zr26Mo2.5Cu12Be38(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti44.5Zr40Mo7.5Cu6Be2The volume fraction of the reinforcing phase is 50%.
Example 8
Ti40Zr25Mo5Cu7Be23；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti13Zr30.5Mo2.5Cu10Be44(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti67Zr19.5Mo7.5Cu4Be2The volume fraction of the reinforcing phase is 50%.
Example 9
Ti30Zr33Mo5Cu9Be23；
Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti26Zr27Mo1.5Cu9.5Be36(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti34Zr40Mo7.5Cu8.5Be10The volume fraction of the reinforcing phase is 50%.
Comparative example 1
Ti45Zr25Mo5Cu6Be19；
Wherein, the matrix phase is titanium-based metal glass, and the atomic percentage expression is as follows; ti30Zr40Mo5Cu5Be20(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti60Zr10Mo5Cu7Be18The volume fraction of the reinforcing phase is 50%.
Comparative example 2
Ti44Zr26Mo4Cu8Be18；
Wherein, the matrix phase is titanium-based metal glass, and the atomic percentage expression is as follows; ti24Zr32Mo1.5Cu15Be27.5(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti64Zr20Mo6.5Cu1Be8.5The volume fraction of the reinforcing phase is 50%.
Comparative example 3
Ti45Zr23Mo4Cu8Be20；
Wherein, the matrix phase is titanium-based metal glass, and the atomic percentage expression is as follows; ti24Zr32Mo3.5Cu9Be31.5(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti66Zr14Mo4.5Cu7Be8.5The volume fraction of the reinforcing phase is 50%.
Example I
a. Example 1 was selected as the composite filler metal. Melting the composite brazing filler metal for 3min at 895 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by using high-speed airflow at the frequency of 500KHz and the high speed of Mach 2.3 to obtain composite amorphous powder with the diameter of 80 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 550 ℃ and the spraying pressure of 0.7 MPa in the He atmosphere environment, wherein the spraying thickness is 10 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing at 920 ℃, and keeping the temperature for 20 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 8m/s, the temperature tau of the cooling air is 14 ℃, and the cooling time is 5 min.
Example II
a. Example 2 was selected as a composite filler metal. Melting the composite brazing filler metal for 5min at 890 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by high-speed airflow at the frequency of 80KHz and the high speed of 2.5 Mach to obtain composite amorphous powder with the diameter of 50 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 600 ℃ and the spraying pressure of 0.6MPa in the He atmosphere environment, wherein the spraying thickness is 15 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing is carried out at the temperature of 900 ℃, and heat preservation is carried out for 25 min;
e. after brazing, air cooling is adopted, the temperature is reduced according to a temperature reduction rate function,obtaining a brazing part till the room temperature, wherein the function of the cooling rate is as follows:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 4m/s, the temperature tau of the cooling air is 16 ℃, and the cooling time is 1.5 min.
Example III
a. Selecting the composite brazing filler metal obtained in the embodiment 3 as the composite brazing filler metal, melting the composite brazing filler metal for 2min at 900 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by using high-speed airflow at the frequency of 100KHz and the high speed of Mach 2 to obtain composite amorphous powder with the diameter of 100 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 500 ℃ and the spraying pressure of 0.9MPa in the He atmosphere environment, wherein the spraying thickness is 5 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing at 930 ℃, and keeping the temperature for 15 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 16m/s, the temperature tau of the cooling air is 12 ℃, and the cooling time is 15 min.
Example IV
a. Selecting the composite brazing filler metal obtained in the embodiment 4 as the composite brazing filler metal, melting the composite brazing filler metal at 891 ℃ for 3min to obtain a molten liquid, and impacting the molten liquid by using high-speed airflow at the frequency of 82KHz and the high speed of Mach 2.1 to obtain composite amorphous powder with the diameter of 60 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 520 ℃ and the spraying pressure of 0.7 MPa in the He atmosphere environment, wherein the spraying thickness is 6 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing is carried out at the temperature of 910 ℃, and the heat preservation is carried out for 16 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 5m/s, the temperature tau of the cooling air is 15 ℃, and the cooling time is 2 min.
Example V
a. Selecting the composite brazing filler metal obtained in the embodiment 5 as the composite brazing filler metal, melting the composite brazing filler metal for 2.5min at 892 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by using high-speed airflow at the frequency of 85KHz and the high speed of 2.2 Mach to obtain composite amorphous powder with the diameter of 70 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 510 ℃ and the spraying pressure of 0.65 MPa in the He atmosphere environment, wherein the spraying thickness is 12 microns;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing is carried out at the temperature of 9015 ℃, and heat preservation is carried out for 21 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 6m/s, the temperature tau of the cooling air is 13 ℃, and the cooling time is 8.5 min.
Example VI
a. Selecting the composite brazing filler metal obtained in the embodiment 6 as the composite brazing filler metal, melting the composite brazing filler metal at 893 ℃ for 3.5min to obtain a molten liquid, and impacting the molten liquid by using high-speed airflow at the frequency of 85KHz and the high speed of Mach 2.5 to obtain composite amorphous powder with the diameter of 80 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 560 ℃ and the spraying pressure of 0.65 MPa in the He atmosphere environment, wherein the spraying thickness is 12 microns;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing is carried out at the temperature of 920 ℃, and the temperature is kept for 22 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 12m/s, the temperature tau of the cooling air is 13 ℃, and the cooling time is 9 min.
Example VII
a. Selecting the composite solder of example 7 as the composite solder, melting the composite solder for 4.5min at 899 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by high-speed airflow at the frequency of 98KHz and the high speed of Mach 2.4 to obtain the composite amorphous powder with the diameter of 90 mu.
b. Spraying the composite amorphous powder to the end face to be connected at a gas temperature of 590 ℃ and a spraying pressure of 0.68 MPa in a He atmosphere environment, wherein the spraying thickness is 13 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing at 925 deg.C, and keeping the temperature for 24 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 4m/s, the temperature tau of the cooling air is 13 ℃, and the cooling time is 13 min.
Example VIII
a. Selecting the composite brazing filler metal obtained in the embodiment 8 as the composite brazing filler metal, melting the composite brazing filler metal at 896 ℃ for 3.5min to obtain a molten liquid, and impacting the molten liquid by using high-speed airflow at the frequency of 88KHz and the high speed of Mach 2.4 to obtain composite amorphous powder with the diameter of 66 mu.
b. Spraying the composite amorphous powder to the end face to be connected at 595 ℃ and 0.8 MPa in He atmosphere, wherein the spraying thickness is 11 microns;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing is carried out at the temperature of 915 ℃, and the heat preservation is carried out for 19 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 13m/s, the temperature tau of the cooling air is 15 ℃, and the cooling time is 6 min.
Example IX
a. Selecting the composite brazing filler metal obtained in the embodiment 9 as the composite brazing filler metal, melting the composite brazing filler metal for 4min at 897 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by using high-speed airflow at the frequency of 90KHz and the high speed of Mach 2.3 to obtain composite amorphous powder with the diameter of 70 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 550 ℃ and the spraying pressure of 0.65 MPa in the He atmosphere environment, wherein the spraying thickness is 11 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing at 911 deg.c and maintaining for 18 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 6m/s, the temperature tau of the cooling air is 13 ℃, and the cooling time is 8 min.
Comparative example I
a. Comparative example 1 was selected as the composite filler metal. Melting the composite brazing filler metal for 3min at 895 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by using high-speed airflow at the frequency of 500KHz and the high speed of Mach 2.3 to obtain composite amorphous powder with the diameter of 80 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 550 ℃ and the spraying pressure of 0.7 MPa in the He atmosphere environment, wherein the spraying thickness is 10 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing at 920 ℃, and keeping the temperature for 20 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 8m/s, the temperature tau of the cooling air is 14 ℃, and the cooling time is 5 min.
Comparative example II
a. Comparative example 2 was selected as the composite filler metal. Melting the composite brazing filler metal for 3min at 895 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by using high-speed airflow at the frequency of 500KHz and the high speed of Mach 2.3 to obtain composite amorphous powder with the diameter of 80 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 550 ℃ and the spraying pressure of 0.7 MPa in the He atmosphere environment, wherein the spraying thickness is 10 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing at 920 ℃, and keeping the temperature for 20 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 8m/s, the temperature tau of the cooling air is 14 ℃, and the cooling time is 5 min.
Comparative example III
a. Comparative example 3 was selected as the composite filler metal. Melting the composite brazing filler metal for 3min at 895 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by using high-speed airflow at the frequency of 500KHz and the high speed of Mach 2.3 to obtain composite amorphous powder with the diameter of 80 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 550 ℃ and the spraying pressure of 0.7 MPa in the He atmosphere environment, wherein the spraying thickness is 10 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing at 920 ℃, and keeping the temperature for 20 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time; the wind speed v is 8m/s, the temperature tau of the cooling air is 14 ℃, and the cooling time is 5 min.
Comparative example IV
a. Example 1 was selected as the composite filler metal. Melting the composite brazing filler metal for 3min at 895 ℃, obtaining a molten liquid after melting, and then impacting the molten liquid by using high-speed airflow at the frequency of 500KHz and the high speed of Mach 2.3 to obtain composite amorphous powder with the diameter of 80 mu.
b. Spraying the composite amorphous powder to the end face to be connected at the gas temperature of 550 ℃ and the spraying pressure of 0.7 MPa in the He atmosphere environment, wherein the spraying thickness is 10 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing at 920 ℃, and keeping the temperature for 20 min;
e. after brazing, air cooling is adopted, and cooling is carried out at constant speed for 10 ℃/s until the temperature reaches the room temperature.
Data analysis
The weldments from examples I-IX and comparative examples I-IV were tested and the results are shown in Table 1;
TABLE 1
As can be seen from Table 1, the TC4 titanium alloy brazed according to the method of the present invention has significant advantages in spreading behavior, wetting angle, elemental spreading, and tensile properties.
FIG. 1 is a metallographic microstructure of a brazing material obtained in example I, FIG. 2 is a Scanning Electron Microscope (SEM) image of the brazing material obtained in example I, FIG. 3 is a line scanning analysis of IEDS of the example, and it can be seen from FIGS. 1 to 3 that the brazing material is sufficiently spread on the surface of the base metal, the bonding between the brazing material and the base metal is good under the condition that the brazing gap is ensured, the brazing material structure is similar to the α type titanium alloy structure, the interface structure is completely weidrite structure, and no precipitates are found in the interface.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. A method of brazing TC4 titanium alloy using a composite braze, comprising:
a. mixing Ti30-40Zr24-33Mo5-10Cu7-18Be13-23Melting the composite solder to obtain molten liquid, and obtaining composite amorphous powder by using a gas atomization method;
b. spraying the composite amorphous powder to the end face to be connected by a cold spraying method, wherein the spraying thickness is 5-15 mu m;
c. assembling the tooling fixture into a welding part, and enabling the TC4 titanium alloy end face to be welded to be in close contact;
d. brazing is carried out at the temperature of 900-930 ℃, and heat preservation is carried out for 15-25 min;
e. adopt the air cooling after brazing, cool down it according to cooling rate function, can obtain the brazing part until the room temperature, the cooling rate function is:
v is the wind speed m/s, T is the temperature of cooling air, and s is the area m of the brazing point2And t is the cooling time;
in the step a, the matrix phase in the composite solder is titanium-based metal glass, and the atomic percentage expression of the matrix phase is shown as follows; in the composite solder, a matrix phase is titanium-based metal glass, and the atomic percentage expression of the matrix phase is as follows; ti13-26Zr26-36Mo1.5- 2.5Cu10-12Be24-44(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti34- 67Zr12-40Mo7.5-18.5Cu2-26Be2-20The volume fraction of the reinforcing phase is 50%.
2. The method of brazing TC4 titanium alloy using composite filler metal according to claim 1, wherein: the expression of atomic percent in the composite solder is as follows: ti32Zr27Mo8Cu13Be20(ii) a Wherein, in the composite solder, the matrix phase is titanium-based metal glass, and the atomic percentage expression is shown as follows; ti20Zr29Mo2Cu11Be38(ii) a The reinforcing phase is titanium-based dendrite with a body-centered cubic structure, and the atomic percent expression of the dendrite is as follows: ti44Zr25Mo14Cu15Be2The volume fraction of the reinforcing phase is 50%.
3. The method of brazing TC4 titanium alloy using composite filler metal according to claim 1, wherein: in step a said Ti30-40Zr24-33Mo5-10Cu7-18Be13-23The melting temperature of the composite solder is 890-900 ℃, and the time is 2-5 min.
4. The method of brazing TC4 titanium alloy using composite filler metal according to claim 1, wherein: in the step a, the gas atomization method is to make high-speed airflow impact the molten liquid at the frequency of 80-100 KHz and the high speed of Mach 2-2.5 to obtain the composite amorphous powder with the diameter of 50-100 mu m.
5. The method of brazing TC4 titanium alloy using composite filler metal according to claim 1, wherein: in the step b, the cold spraying method is carried out under the condition of He atmosphere, the gas temperature is 500-600 ℃, and the spraying pressure is 0.6-0.9 MPa.
6. The method of brazing TC4 titanium alloy using composite filler metal according to claim 1, wherein: in the step e, the wind speed v is 4-16 m/s, the temperature tau of the cooling air is 12-16 ℃, and the cooling time is 1.5-15 min.
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| JPS59116350A (en) * | 1982-12-23 | 1984-07-05 | Masaaki Naga | Alloy foil strip formed by quick liquid cooling for brazing |
| CN103567666B (en) * | 2013-11-15 | 2016-04-20 | 中国航空工业集团公司北京航空制造工程研究所 | Be applicable to titanium alloy soldering and Ti 2the strip brazing material of AlNb alloy brazed and preparation and method for welding |
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