CN118186326A - Electric pulse toughening treatment method for high-toughness titanium alloy linear friction welding joint - Google Patents
Electric pulse toughening treatment method for high-toughness titanium alloy linear friction welding joint Download PDFInfo
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- 238000011282 treatment Methods 0.000 title claims abstract description 63
- 238000003466 welding Methods 0.000 title claims abstract description 57
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 49
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000010949 copper Substances 0.000 claims abstract description 27
- 229910052802 copper Inorganic materials 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000010278 pulse charging Methods 0.000 claims abstract description 9
- 101000686227 Homo sapiens Ras-related protein R-Ras2 Proteins 0.000 claims description 20
- 102100025003 Ras-related protein R-Ras2 Human genes 0.000 claims description 20
- 238000003754 machining Methods 0.000 claims description 15
- 238000007600 charging Methods 0.000 claims description 7
- 238000007781 pre-processing Methods 0.000 claims description 7
- 238000005728 strengthening Methods 0.000 claims description 4
- 210000005067 joint tissue Anatomy 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 11
- 239000013078 crystal Substances 0.000 description 7
- 239000010953 base metal Substances 0.000 description 5
- 239000012071 phase Substances 0.000 description 4
- 238000003776 cleavage reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
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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
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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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 discloses an electric pulse toughening treatment method of a high-toughness titanium alloy linear friction welding head, which adopts a pulse power supply positive and negative electrode clamp to clamp and fix a joint sample in a circuit, wherein the positive and negative electrode clamp is made of pure copper, a digital storage oscilloscope is connected with the positive and negative electrodes of the pulse power supply and used for testing and storing relevant parameters of pulse current, a contact surface thermometer is adopted to be in close contact with the surface of the sample, the real-time temperature rise of the central area of the sample is measured, the joint tissue regulation and control are realized by changing the variables such as pulse charging voltage, pulse frequency, pulse time and the like, and then the final sample is obtained through air cooling. The invention realizes the local regulation and control of the joint structure on the premise of not affecting the parent metal structure, and can greatly improve the toughness of the joint while ensuring the good strength of the joint.
Description
Technical Field
The invention belongs to the technical field of electric pulse treatment methods, and particularly relates to an electric pulse toughening treatment method of a high-toughness titanium alloy linear friction welding head.
Background
The high-toughness titanium alloy is mainly applied to the preparation of the aircraft fuselage structural member due to high toughness and good comprehensive mechanical properties. As an advanced solid phase welding technology, linear Friction Welding (LFW) is an important method for realizing high-quality connection of titanium alloy due to the advantages of high welding efficiency, excellent forming quality, self-cleaning function and the like. The titanium alloy structural member prepared by the method is not limited by the size of the welding section, a preformed semi-finished part can be directly welded into an integral joint, and the joint with the same strength as the integral structural member is obtained through finish machining. But the low toughness of the joint greatly limits the use of the structural member on an aircraft, which is mainly due to dynamic recovery and recrystallization of the joint weld zone structure under the action of friction extrusion force and shearing force, so that an equiaxed crystal structure is formed. In equiaxed tissue, crack propagation paths are straight, fast, few branches, and less energy is absorbed during failure, so toughness is very low. The electric pulse treatment is used as a local rapid heat treatment technology, the joint structure regulation and control can be realized under the condition that the base material structure is not influenced, the precise regulation and control of the joint structure is realized by utilizing the cooperation of the Joule heat effect and the electron wind non-heat effect, and the grain growth is needle-shaped or lamellar structure after the nucleation is controlled by the electron wind, so that the equiaxed structure of the joint is changed into a staggered basket structure, and the toughness of the joint is improved.
Disclosure of Invention
The invention aims to provide an electric pulse toughening treatment method for a high-toughness titanium alloy linear friction welding joint, which can greatly improve the joint toughness by regulating and controlling a TC21 titanium alloy joint structure through electric pulse treatment.
The technical scheme adopted by the invention is that the electric pulse toughening treatment method of the high-toughness titanium alloy linear friction welding head is implemented according to the following steps:
Step 1, preparing a TC21 titanium alloy linear friction welding structural member by a preferential welding process;
step 2, preparing a strip sample required by electric pulse treatment on the welded joint in a machining mode, and preprocessing the surface of the strip sample;
step 3, fixing the strip-shaped sample processed in the step 2 between two copper electrodes of the electric pulse equipment;
step 4, controlling the electric pulse processing temperature and range by adjusting the electric pulse charging voltage, the pulse frequency and the pulse time;
And 5, air cooling to room temperature after the electric pulse treatment, and testing the strength and toughness of the sample after the electric pulse treatment.
The invention is also characterized in that:
the technological parameters of the TC21 titanium alloy linear friction welding in the step 1 are as follows: the vibration frequency is 30 Hz-70 Hz, the amplitude is 2-5 mm, the friction pressure is 30-70 MPa, the upsetting pressure is 50-90 MPa, and the pressure maintaining time is 10-20 s.
In the step 2, the dimension is 90 multiplied by 10 multiplied by 3mm 3, the surface of the sample is ground by a grinding machine, and the surface machining precision is controlled within 0.01 mm.
In step 3, the two copper electrodes are 240×30×3.2mm 3 in size, and the effective distance between the two copper electrodes is 60mm.
In the step 4, a contact surface thermometer is adopted when the temperature is measured, and the range of the electric pulse processing parameters is as follows: the charging voltage is 10V-70V, the pulse frequency is 100 Hz-300 Hz, the pulse time is 10 s-100 s, and the root mean square current density is 1X 10 6A/m2～9×106A/m2.
And 5, testing the joint strength by using a tensile sample, and then using an impact sample to characterize the joint toughness, and analyzing the joint structure corresponding to the toughness under different electric pulse conditions.
The beneficial effects of the invention are as follows: the invention provides an electric pulse toughening treatment method of a high-toughness titanium alloy linear friction welding joint, which realizes the local regulation and control of the joint structure on the premise of not influencing the base metal structure and can greatly improve the joint toughness while ensuring the good strength of the joint.
Drawings
FIG. 1 is a schematic illustration of the experimental process of the electrical pulse strengthening treatment method of the high-toughness titanium alloy linear friction welding joint of the present invention;
FIG. 2 is a microstructure of weld zones before and after electrical pulse treatment of a joint obtained in example 2 of the electrical pulse strengthening treatment method of a high toughness titanium alloy linear friction welding joint according to the present invention;
FIG. 3 is a schematic diagram showing the composition evolution of weld zone before and after joint electric pulse treatment in the electric pulse toughening treatment method of the high-toughness titanium alloy linear friction welding joint of the invention;
FIG. 4 is a graph of impact toughness values of a joint subjected to different electrical pulse treatments in the electrical pulse toughening treatment method of the high-toughness titanium alloy linear friction welding joint of the present invention;
FIG. 5 is a graph of post-weld green joint impact fracture sites in the electrical pulse toughening process of the high toughness titanium alloy linear friction weld joint of the present invention;
FIG. 6 is a graph of joint impact fracture sites obtained in example 2 of the electrical pulse toughening treatment method of the high toughness titanium alloy linear friction welding joint of the present invention;
FIG. 7 is a graph of post-weld green joint impact fracture morphology in the electrical pulse toughening treatment method of the high toughness titanium alloy linear friction weld joint of the present invention;
FIG. 8 is a graph of joint impact fracture morphology obtained in example 2 of the method of electric pulse toughening treatment of a high toughness titanium alloy linear friction welding joint according to the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention relates to an electric pulse toughening treatment method of a high-toughness titanium alloy linear friction welding head, which is implemented according to the following steps:
step 1, preparing a TC21 titanium alloy linear friction welding structural member by a preferential welding process, wherein the nominal component of the TC21 titanium alloy is Ti-6Al-2Zr-2Sn-2Mo-1.5Cr-2N;
the technological parameters of the TC21 titanium alloy linear friction welding in the step 1 are as follows: vibration frequency is 30 Hz-70 Hz, amplitude is 2 mm-5 mm, friction pressure is 30 MPa-70 MPa, upsetting pressure is 50 MPa-90 MPa, and dwell time is 10 s-20 s;
step 2, preparing a strip sample required by electric pulse treatment on the welded joint in a machining mode, and preprocessing the surface of the strip sample;
In the step 2, the dimension is 90 multiplied by 10 multiplied by 3mm 3, the surface of the sample is ground by a grinding machine, and the surface machining precision is controlled within 0.01 mm;
step 3, fixing the strip-shaped sample processed in the step 2 between two copper electrodes of the electric pulse equipment;
in the step 3, the sizes of the two copper electrodes are 240 multiplied by 30 multiplied by 3.2mm 3, and the effective distance between the two copper electrodes is 60mm;
step 4, controlling the electric pulse processing temperature and range by adjusting the electric pulse charging voltage, the pulse frequency and the pulse time;
In the step 4, a contact surface thermometer is adopted when the temperature is measured, and the range of the electric pulse processing parameters is as follows: the charging voltage is 10V-70V, the pulse frequency is 100 Hz-300 Hz, the pulse time is 10 s-100 s, and the root mean square current density is 1X 10 6A/m2～9×106A/m2;
Step 5, air cooling to room temperature after electric pulse treatment, and testing the strength and toughness of the sample after electric pulse treatment to clarify the interdependence relationship between the joint structure and the toughness;
and 5, testing the joint strength by using a tensile sample, characterizing the joint toughness by using an impact sample, analyzing the joint structure corresponding to the toughness under different electric pulse conditions, and clarifying the dependence relationship between the microstructure and the toughness of the TC21 titanium alloy joint.
Example 1
The electric pulse toughening treatment method of the high-toughness titanium alloy linear friction welding head is implemented according to the following steps:
Step 1, preparing a TC21 titanium alloy linear friction welding structural member by a preferential welding process, wherein the parameter range of the TC21 titanium alloy linear friction welding process is the vibration frequency: 35Hz, amplitude 4mm, friction pressure 60MPa, upsetting pressure 80MPa and dwell time 10s.
Step 2, preparing a strip-shaped sample required by electric pulse treatment on a welded joint in a machining mode, preprocessing the surface of the strip-shaped sample, wherein the size of the sample is 90 multiplied by 10 multiplied by 3mm 3, grinding the surface of the sample by a grinding machine, and controlling the surface machining precision to be within 0.01 mm;
And 3, fixing the strip-shaped sample processed in the step 2 between two copper electrodes of an electric pulse device, wherein the sizes of the two copper electrodes are 240 multiplied by 30 multiplied by 3.2mm 3, and fixing the processed sample between the two copper electrodes, and the effective distance between the copper electrodes is 60mm.
Step 4, controlling the electric pulse processing temperature and range by adjusting the electric pulse charging voltage, the pulse frequency and the pulse time; the range of the electric pulse processing parameters is as follows: the charging voltage was 50V, the pulse frequency was 190Hz, the pulse time was 70s, and the root mean square current density was 6.35X10 6A/m2.
And 5, air cooling to room temperature after electric pulse treatment, testing the strength and toughness of the samples after the electric pulse treatment, clarifying the interdependence relation between the joint structure and the toughness, testing the joint strength by using a tensile sample, characterizing the joint toughness by using an impact sample, and analyzing the joint structure corresponding to the toughness under different electric pulse conditions.
Example 2
The electric pulse toughening treatment method of the high-toughness titanium alloy linear friction welding head is implemented according to the following steps:
Step 1, preparing a TC21 titanium alloy linear friction welding structural member by a preferential welding process, wherein the parameter range of the TC21 titanium alloy linear friction welding process is the vibration frequency: 70Hz, amplitude 3mm, friction pressure 40MPa, upsetting pressure 50MPa and dwell time 15s.
Step 2, preparing a strip-shaped sample required by electric pulse treatment on a welded joint in a machining mode, preprocessing the surface of the strip-shaped sample, wherein the size of the sample is 90 multiplied by 10 multiplied by 3mm 3, grinding the surface of the sample by a grinding machine, and controlling the surface machining precision to be within 0.01 mm;
And 3, fixing the strip-shaped sample processed in the step 2 between two copper electrodes of an electric pulse device, wherein the sizes of the two copper electrodes are 240 multiplied by 30 multiplied by 3.2mm 3, and fixing the processed sample between the two copper electrodes, and the effective distance between the copper electrodes is 60mm.
Step 4, controlling the electric pulse processing temperature and range by adjusting the electric pulse charging voltage, the pulse frequency and the pulse time; the range of the electric pulse processing parameters is as follows: the charging voltage was 50V, the pulse frequency was 220Hz, the pulse time was 70s, and the root mean square current density was 7.07X 10 6A/m2.
And 5, air cooling to room temperature after electric pulse treatment, testing the strength and toughness of the samples after the electric pulse treatment, clarifying the interdependence relation between the joint structure and the toughness, testing the joint strength by using a tensile sample, characterizing the joint toughness by using an impact sample, and analyzing the joint structure corresponding to the toughness under different electric pulse conditions.
Example 3
The electric pulse toughening treatment method of the high-toughness titanium alloy linear friction welding head is implemented according to the following steps:
Step 1, preparing a TC21 titanium alloy linear friction welding structural member by a preferential welding process, wherein the parameter range of the TC21 titanium alloy linear friction welding process is the vibration frequency: 40Hz, amplitude 3.5mm, friction pressure 50MPa, upsetting pressure 60MPa and dwell time 13s.
Step 2, preparing a strip-shaped sample required by electric pulse treatment on a welded joint in a machining mode, preprocessing the surface of the strip-shaped sample, wherein the size of the sample is 90 multiplied by 10 multiplied by 3mm 3, grinding the surface of the sample by a grinding machine, and controlling the surface machining precision to be within 0.01 mm;
And 3, fixing the strip-shaped sample processed in the step 2 between two copper electrodes of an electric pulse device, wherein the sizes of the two copper electrodes are 240 multiplied by 30 multiplied by 3.2mm 3, and fixing the processed sample between the two copper electrodes, and the effective distance between the copper electrodes is 60mm.
Step 4, controlling the electric pulse processing temperature and range by adjusting the electric pulse charging voltage, the pulse frequency and the pulse time; the range of the electric pulse processing parameters is as follows: the charging voltage was 50V, the pulse frequency was 250Hz, the pulse time was 60s, and the root mean square current density was 7.36X 10 6A/m2.
And 5, air cooling to room temperature after electric pulse treatment, testing the strength and toughness of the samples after the electric pulse treatment, clarifying the interdependence relation between the joint structure and the toughness, testing the joint strength by using a tensile sample, characterizing the joint toughness by using an impact sample, and analyzing the joint structure corresponding to the toughness under different electric pulse conditions.
Example 4
The electric pulse toughening treatment method of the high-toughness titanium alloy linear friction welding head is implemented according to the following steps:
Step 1, preparing a TC21 titanium alloy linear friction welding structural member by a preferential welding process, wherein the parameter range of the TC21 titanium alloy linear friction welding process is the vibration frequency: 50Hz, amplitude 3mm, friction pressure 50MPa, upsetting pressure 70MPa and dwell time 15s.
Step 2, preparing a strip-shaped sample required by electric pulse treatment on a welded joint in a machining mode, preprocessing the surface of the strip-shaped sample, wherein the size of the sample is 90 multiplied by 10 multiplied by 3mm 3, grinding the surface of the sample by a grinding machine, and controlling the surface machining precision to be within 0.01 mm;
And 3, fixing the strip-shaped sample processed in the step 2 between two copper electrodes of an electric pulse device, wherein the sizes of the two copper electrodes are 240 multiplied by 30 multiplied by 3.2mm 3, and fixing the processed sample between the two copper electrodes, and the effective distance between the copper electrodes is 60mm.
Step 4, controlling the electric pulse processing temperature and range by adjusting the electric pulse charging voltage, the pulse frequency and the pulse time; the range of the electric pulse processing parameters is as follows: the charging voltage was 50V, the pulse frequency was 250Hz, the pulse time was 70s, and the root mean square current density was 7.28X10 6A/m2.
And 5, air cooling to room temperature after electric pulse treatment, testing the strength and toughness of the samples after the electric pulse treatment, clarifying the interdependence relation between the joint structure and the toughness, testing the joint strength by using a tensile sample, characterizing the joint toughness by using an impact sample, and analyzing the joint structure corresponding to the toughness under different electric pulse conditions.
FIG. 1 is a schematic illustration of an electrical pulse strengthening process for high toughness titanium alloy linear friction welding joints, which is an electrical pulse process for TC21 linear friction welding joints by an electro-plastic pulse device. Clamping and fixing the joint sample in a circuit by adopting a pulse power supply positive and negative electrode clamp which is made of pure copper and has the size of 240 multiplied by 30 multiplied by 3.2mm 3; connecting the digital storage oscilloscope with the positive electrode and the negative electrode of the pulse power supply for testing and storing relevant parameters of pulse current; and a contact type surface thermometer is adopted to be closely contacted with the surface of the sample, so that the real-time temperature rise of the central area of the sample is measured. And realizing joint tissue regulation and control by changing the variables such as pulse charging voltage, pulse frequency, pulse time and the like, and then air cooling to obtain a final sample.
FIG. 2 is a microstructure of weld areas before and after the joint electric pulse treatment obtained in example 2. FIG. 2 (a) shows the weld zone structure of the untreated joint after welding, the original equiaxed crystal structure is clearly visible, the grain boundary is a long-strip primary alpha phase, and a large amount of secondary alpha' phases and residual beta phases are dispersed and distributed in the crystal grain; after the electric pulse treatment, the original equiaxed crystals of the weld zone disappear, the primary alpha phase of the crystal boundary is converted into lamellar, the spherical dispersed particles in the crystal are converted into needle-shaped particles, and the structure conversion process is shown as figure 3, so that a mutually staggered basket structure is formed on the beta matrix.
FIG. 4 is a graph comparing strength and toughness of a joint subjected to different electric pulse treatments in the electric pulse toughening treatment method of the high-toughness titanium alloy linear friction welding joint of the invention. The impact toughness values of the joints obtained in examples 1-4 are in the range of 45J/cm 2～60J/cm2, the strength ranges from 915MPa to 1009MPa, and the strength and toughness of the joints after electric pulse treatment can reach more than 85% of the strength and toughness of TC21 base materials. Example 2 the toughness of the joint after the electric pulse treatment reaches 90.5% of the base metal toughness value, the joint strength reaches 87% of the base metal strength value, and the toughness of the joint after the electric pulse treatment is improved by 138.4% compared with the toughness of the welded joint.
FIG. 5 is a graph of post-weld green joint impact fracture sites in the electrical pulse toughening process of the high toughness titanium alloy linear friction weld joint of the present invention. The graph shows that the original welded joint cracking zone is approximately linearly expanded along the thermal influence zone in the central area of the welding seam, the shearing lip zone is arranged in the central part of the welding seam, and the whole crack expansion path is slightly deflected.
FIG. 6 is a graph showing the impact fracture sites of the joint obtained in example 2 in the method of electric pulse toughening treatment of a high-toughness titanium alloy linear friction welding joint according to the present invention. The graph shows that after electric pulse heat treatment, the crack propagation path of the joint is very tortuous and can be divided into four stages I-IV, and the propagation path shows twice deflection of approximately 90 degrees.
FIG. 7 is a graph of post-weld green joint impact fracture morphology in the electrical pulse toughening process of the high toughness titanium alloy linear friction weld joint of the present invention. As can be seen, the initiation region (fig. 7 a) has distinct cleavage planes and tear edges, the crack propagation region (fig. 7 b) is predominantly along the crystal fracture, there are many slush facets, and the shear lip region is very shallow in dimples, so the as-welded joint is a typical brittle fracture mode.
FIG. 8 is a graph of joint impact fracture morphology obtained in example 2 of the method for electric pulse toughening treatment of a high toughness titanium alloy linear friction welding joint according to the present invention. As can be seen, after the electrical pulse treatment, the initiation region (fig. 8 a), the crack extension region (fig. 8 b), and the shear lip region (fig. 8 c) are all composed of a plurality of dimples, and the crack extension region has no cleavage plane and no tearing edges, which is a typical ductile fracture mode.
The toughness of the TC21 titanium alloy joint obtained after the electric pulse treatment reaches 90.5% of the base metal toughness value, and the joint strength reaches 87% of the base metal strength value, which shows that the electric pulse heat/non-heat synergistic effect can effectively regulate and control joint structure, synchronously improve joint toughness, and has important theoretical significance and engineering application value.
Claims (6)
1. The electric pulse toughening treatment method of the high-toughness titanium alloy linear friction welding head is characterized by comprising the following steps of:
Step 1, preparing a TC21 titanium alloy linear friction welding structural member by a preferential welding process;
step 2, preparing a strip sample required by electric pulse treatment on the welded joint in a machining mode, and preprocessing the surface of the strip sample;
step 3, fixing the strip-shaped sample processed in the step 2 between two copper electrodes of the electric pulse equipment;
step 4, controlling the electric pulse processing temperature and range by adjusting the electric pulse charging voltage, the pulse frequency and the pulse time;
And 5, air cooling to room temperature after the electric pulse treatment, and testing the strength and toughness of the sample after the electric pulse treatment.
2. The method for electric pulse toughening treatment of high-toughness titanium alloy linear friction welding joint according to claim 1, wherein the technological parameters of the TC21 titanium alloy linear friction welding in the step 1 are as follows: the vibration frequency is 30 Hz-70 Hz, the amplitude is 2-5 mm, the friction pressure is 30-70 MPa, the upsetting pressure is 50-90 MPa, and the pressure maintaining time is 10-20 s.
3. The method for electric pulse toughening treatment of high-toughness titanium alloy linear friction welding joint according to claim 1, wherein the dimension in the step 2 is 90×10×3mm 3, the surface of the sample is ground by a grinding machine, and the surface machining precision is controlled within 0.01 mm.
4. The method for electric pulse toughening treatment of high-toughness titanium alloy linear friction welding joint according to claim 1, wherein in the step 3, the two copper electrodes are 240×30×3.2mm 3 in size, and the effective distance between the two copper electrodes is 60mm.
5. The method for strengthening and toughening the electrical pulse of the high-toughness titanium alloy linear friction welding head according to claim 1, wherein the temperature is measured in the step 4, a contact surface thermometer is adopted, and the electrical pulse treatment parameters range is as follows: the charging voltage is 10V-70V, the pulse frequency is 100 Hz-300 Hz, the pulse time is 10 s-100 s, and the root mean square current density is 1X 10 6A/m2～9×106A/m2.
6. The method for electric pulse toughening treatment of high-toughness titanium alloy linear friction welding joint according to claim 1, wherein in the step 5, the joint strength is tested by using a tensile sample, the joint toughness is characterized by using an impact sample, and the joint structure corresponding to the toughness under different electric pulse conditions is analyzed.
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| RU2456141C2 (en) * | 2010-06-18 | 2012-07-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Уфимский государственный авиационный технический университет" | Method of friction seam welding of parts from titanium alloys |
| CN111218631A (en) * | 2020-01-08 | 2020-06-02 | 西安理工大学 | Method for preparing high-strength-and-toughness TC21 titanium alloy gradient structure |
| CN116728009A (en) * | 2023-06-13 | 2023-09-12 | 西安理工大学 | Method for regulating and controlling titanium alloy friction welding joint structure based on electric pulse |
| CN117415442A (en) * | 2023-11-15 | 2024-01-19 | 中国航发沈阳黎明航空发动机有限责任公司 | Current-assisted local performance regulation and control method for linear friction welding joint of blisk |
| CN117583719A (en) * | 2023-11-15 | 2024-02-23 | 中国航发沈阳黎明航空发动机有限责任公司 | Current-assisted local shape correction method for linear friction welding joint of blisk |
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