CN117680586A - Preparation method of trace element reinforced TC4 titanium alloy oversized bar - Google Patents
Preparation method of trace element reinforced TC4 titanium alloy oversized bar Download PDFInfo
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- CN117680586A CN117680586A CN202311718578.6A CN202311718578A CN117680586A CN 117680586 A CN117680586 A CN 117680586A CN 202311718578 A CN202311718578 A CN 202311718578A CN 117680586 A CN117680586 A CN 117680586A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 235000013619 trace mineral Nutrition 0.000 title claims abstract description 9
- 239000011573 trace mineral Substances 0.000 title claims abstract description 9
- 238000005242 forging Methods 0.000 claims description 55
- 238000010438 heat treatment Methods 0.000 claims description 27
- 230000009466 transformation Effects 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 235000010627 Phaseolus vulgaris Nutrition 0.000 claims description 5
- 244000046052 Phaseolus vulgaris Species 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 4
- 230000003064 anti-oxidating effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
The invention relates to the technical field of titanium alloy, and particularly discloses a preparation method of a trace element reinforced TC4 titanium alloy oversized bar, which is characterized in that in the upper and lower limit range of industry standard, the room temperature strength is improved by adding Fe element, C element and O element, the high temperature strength is improved by adding Si element, and the upper limit of the added elements is controlled, so that better strength and plasticity matching are obtained, wherein the room temperature strength of the reinforced TC4 titanium alloy reaches 1100MPa, the high temperature strength of 400 ℃ reaches 750MPa, the elongation is more than 10%, and the fracture toughness is more than 60 MPa.m0.5.
Description
Technical Field
The invention relates to the field of titanium and titanium alloy processing, in particular to a preparation method of a trace element reinforced TC4 titanium alloy ultra-large-size (phi 400-phi 550 mm) bar for an engine.
Background
The TC4 alloy is a medium-strength alpha-beta two-phase titanium alloy, and the nominal component of the alloy is Ti-6Al-4V. The alloy has excellent comprehensive performance, can be operated at 400 ℃ for a long time, and is mainly used for manufacturing fans, compressor discs and blades of engines and important bearing members such as beams, joint box formers and the like in aircraft structures in the aviation industry. Along with the requirements of large size and high thrust-weight ratio of an aeroengine, the effective thickness of a forging piece is greatly increased, and higher requirements are put forward for large-size TC4 titanium alloy bars for parts such as fan discs, for example, the diameter of the bars is larger than 450mm, the room-temperature tensile strength is expected to reach over 1030MPa, the strength is reduced along with the increase of the diameter of the bars, and the general strength is about 950MPa and cannot meet the technical requirements.
The TC4 titanium alloy belongs to a solid solution strengthening type titanium alloy, and to increase the temperature and high temperature strength, a large amount of solid solution strengthening elements are required to be added, while the TC4 titanium alloy has a range of components, and if the material components are greatly changed, for example, the Al element is added to more than 5.75% (wt) of the upper standard limit or the C element is added to more than 0.1% (wt) of the upper standard limit, the component range of the TC4 titanium alloy is exceeded, and the TC4 titanium alloy cannot be used as the TC4 titanium alloy in the industry.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of trace element reinforced TC4 titanium alloy oversized bars, which has the advantages of reduced fire, short production period and high batch quality consistency, wherein the prepared bars have the dimensions of phi 400-phi 550mm, the room-temperature tensile strength of 1100MPa and the high-temperature tensile strength of 750MPa, and simultaneously have higher strength, better plasticity and toughness.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the preparation method of the trace element reinforced TC4 titanium alloy oversized bar is characterized by comprising the following steps of:
step 1), ingot casting preparation
Mixing and pressing titanium sponge, al beans, al-V intermediate alloy, al-V-Fe intermediate alloy, aluminum silicon, carbon powder and TiO2 powder into an electrode, and then carrying out three-time vacuum consumable arc melting to obtain a TC4 titanium alloy cast ingot; the TC4 titanium alloy cast ingot comprises the following elements in percentage by mass: 6.3 to 6.8 percent of Al, 4.2 to 4.5 percent of V, 0.15 to 0.3 percent of Fe, 0.2 to 0.25 percent of O, 0.02 to 0.1 percent of C, 0.07 to 0.14 percent of Si, less than or equal to 0.03 percent of N, less than or equal to 0.01 percent of H, less than or equal to 0.1 percent of other impurity elements and the balance of Ti;
step 2), cogging forging
Heating to 750-850 ℃, charging, preserving heat for 2-3 hours, then heating to 1100-1200 ℃, preserving heat for 120-300 minutes, discharging, cogging and forging on a rapid forging machine, and controlling upsetting deformation to be 30% -50%;
step 3), high-low cycle forging
Heating and heat-preserving forging at 30-150 ℃ above the beta transformation point of one fire and heating and heat-preserving forging at 30-70 ℃ below the beta transformation point of one fire, and circularly forging for 2-3 times, wherein the single deformation is 15% -50%;
step 4), forging in two-phase region
Forging for 2-6 times after heating at 30-60 ℃ below the beta phase transition point, wherein the single upsetting deformation is controlled to be 30% -50%;
step 5), forming forging
And heating the steel bar at 20-50 ℃ below the beta phase transition point, and then forging and forming the steel bar with 1-3 times of fire, wherein the single deformation is controlled to be 10% -30%, and the steel bar with the diameter of 450-550mm is obtained.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts various microelements to strengthen the performance of the conventional TC4 titanium alloy, in the upper and lower limit range of the industrial standard, the room temperature strength is improved by adding Fe element, C element and O element, the high temperature strength is improved by adding Si element, and the upper limit of the added elements is controlled, so that better strength and plasticity matching are obtained, wherein the room temperature strength of the strengthened TC4 titanium alloy reaches 1100MPa, the high temperature strength of 400 ℃ reaches 750MPa, the elongation is more than 10%, and the fracture toughness is more than 60 MPa.m0.5; the large-specification TC4 titanium alloy bar prepared in this way not only meets the requirements of industry standards, but also can obtain higher room temperature and high temperature strength;
the invention adopts a cyclic recrystallization forging process, and can obtain uniform and fine two-phase area titanium alloy forging structure on the basis of using less fire, thereby leading the bar to obtain excellent plasticity and toughness.
Description of the embodiments
The following examples illustrate the invention in more detail, but are not intended to limit the invention in any way.
Example 1
The material prepared in the embodiment is TC4 titanium alloy cast ingot with the diameter of phi 780mm, and large-specification bars with the diameter of phi 500mm are produced according to the method of the invention. The preparation method comprises the following specific steps:
(1) Mixing and pressing titanium sponge, al beans, al-V intermediate alloy, al-V-Fe intermediate alloy, aluminum silicon, carbon powder and TiO2 powder into an electrode, and then carrying out three-time vacuum consumable arc melting to obtain a TC4 titanium alloy cast ingot; the TC4 titanium alloy cast ingot comprises the following elements in percentage by mass: 6.6% of Al, 4.4% of V, 0.26% of Fe, 0.22% of O, 0.05% of C, 0.07% of Si, less than or equal to 0.03% of N, less than or equal to 0.01% of H and the balance of Ti;
(2) And (3) cogging forging: an antioxidation coating is coated on the surface of the cast ingot, the cast ingot is charged when the resistance furnace is heated to 800 ℃, the temperature is kept for 2 hours, the temperature is raised to 1150 ℃, the cast ingot is discharged after the heat is kept for 280 minutes, and cogging forging is carried out on a 45KN rapid forging machine;
(3) High-low cycle forging: heating in an electric furnace at a temperature of between 100 ℃ and 30 ℃ below the beta transformation point and 40 ℃ below the transformation point, forging on a rapid forging machine after each heating, wherein the deformation is 40%, 30%, 40% and 30%;
(4) Forging in a two-phase region: heating below the beta transformation point at 40 ℃ and then upsetting and forging for 3 times, wherein the deformation is 40%;
(5) And (5) forming and forging: heating at 45 ℃ below the beta transformation point, and then forging and forming for 2 times, wherein the deformation amounts are 30% and 15% respectively.
The bar material of example 1 was examined for properties and structure after heat treatment, and the results are shown in the following Table
Table one: trace element reinforced TC4 bar material and high-temperature tensile mechanical property at temperature of 400 DEG C
。
Example two
The material prepared in the embodiment is TC4 titanium alloy cast ingot with diameter phi 880mm, and large-sized bars with diameter phi 400mm are produced according to the method of the invention. The preparation method comprises the following specific steps:
(1) Mixing and pressing titanium sponge, al beans, al-V intermediate alloy, al-V-Fe intermediate alloy, aluminum silicon, carbon powder and TiO2 powder into an electrode, and then carrying out three-time vacuum consumable arc melting to obtain a TC4 titanium alloy cast ingot; the TC4 titanium alloy cast ingot comprises the following elements in percentage by mass: 6.5% of Al, 4.4% of V, 0.22% of Fe, 0.22% of O, 0.08% of C, 0.12% of Si, less than or equal to 0.03% of N, less than or equal to 0.01% of H and the balance of Ti;
(2) And (3) cogging forging: an antioxidation coating is coated on the surface of the cast ingot, the cast ingot is charged when the resistance furnace is heated to 800 ℃, the temperature is kept for 2 hours, the temperature is raised to 1150 ℃, the cast ingot is discharged after the heat is kept for 360 minutes, and the cast ingot is subjected to cogging forging on a 45KN rapid forging machine;
(3) High-low cycle forging: heating in an electric furnace at a temperature of between 100 ℃ and 30 ℃ below the beta transformation point and 40 ℃ below the transformation point, forging on a rapid forging machine after each heating, wherein the deformation is 40%, 30%, 40% and 30%;
(4) Forging in a two-phase region: heating below the beta transformation point at 40 ℃ and then upsetting and forging for 3 times, wherein the deformation is 40%;
(5) And (5) forming and forging: heating below the beta transformation point at 45 ℃ and then forging and forming for 3 times, wherein the deformation amounts are 30%, 30% and 15% respectively.
The bar material of example 2 was examined for properties and structure after heat treatment, and the results are shown in Table II below:
and (II) table: trace element reinforced TC4 bar material and high-temperature tensile mechanical property at temperature of 400 DEG C
。
Comparative example one
The material prepared in the embodiment is TC4 titanium alloy cast ingot with diameter phi 880mm, and large-sized bars with diameter phi 400mm are produced according to the method of the invention. The preparation method comprises the following specific steps:
(1) Mixing and pressing titanium sponge, al beans, al-V intermediate alloy and TiO2 powder into an electrode, and then carrying out three-time vacuum consumable arc melting to obtain a TC4 titanium alloy cast ingot; the TC4 titanium alloy cast ingot comprises the following elements in percentage by mass: 6.5% of Al, 4.4% of V, 0.04% of Fe, 0.19% of O, 0.01% of C, 0.002% of Si, less than or equal to 0.02% of N, less than or equal to 0.01% of H and the balance of Ti;
(2) And (3) cogging forging: an antioxidation coating is coated on the surface of the cast ingot, the cast ingot is charged when the resistance furnace is heated to 800 ℃, the temperature is kept for 2 hours, the temperature is raised to 1150 ℃, the cast ingot is discharged after the heat is kept for 360 minutes, and the cast ingot is subjected to cogging forging on a 45KN rapid forging machine;
(3) Forging in a single-phase region: heating the materials in an electric furnace at a temperature of 100 ℃ above a beta transformation point and 50 ℃ above the transformation point in sequence, and forging the materials on a rapid forging machine for 2 times after each heating, wherein the deformation amounts are about 40 percent respectively;
(4) Forging in a two-phase region: heating below the beta transformation point at 40 ℃ and then upsetting and forging for 5 times, wherein the deformation is 30%;
(5) And (5) forming and forging: heating below the beta transformation point at 45 ℃ and then forging and forming for 3 times, wherein the deformation amounts are 30%, 30% and 15% respectively.
After heat treatment, the bar material of comparative example 1 was examined for properties and structure, and the results are shown in the following Table III:
table three: high-temperature tensile mechanical property of conventional TC4 titanium alloy large-specification bar at high temperature of 400 DEG C
。
Claims (1)
1. The preparation method of the trace element reinforced TC4 titanium alloy oversized bar is characterized by comprising the following steps of:
step 1), ingot casting preparation
Mixing and pressing titanium sponge, al beans, al-V intermediate alloy, al-V-Fe intermediate alloy, aluminum silicon, carbon powder and TiO2 powder into an electrode, and then carrying out three-time vacuum consumable arc melting to obtain a TC4 titanium alloy cast ingot; the TC4 titanium alloy cast ingot comprises the following elements in percentage by mass: 6.3 to 6.8 percent of Al, 4.2 to 4.5 percent of V, 0.15 to 0.3 percent of Fe, 0.2 to 0.25 percent of O, 0.02 to 0.1 percent of C, 0.07 to 0.14 percent of Si, less than or equal to 0.03 percent of N, less than or equal to 0.01 percent of H, less than or equal to 0.1 percent of other impurity elements and the balance of Ti;
step 2), cogging forging
Heating to 750-850 ℃, charging, preserving heat for 2-3 hours, then heating to 1100-1200 ℃, preserving heat for 120-300 minutes, discharging, cogging and forging on a rapid forging machine, and controlling upsetting deformation to be 30% -50%;
step 3), high-low cycle forging
Heating and heat-preserving forging at 30-150 ℃ above the beta transformation point of one fire and heating and heat-preserving forging at 30-70 ℃ below the beta transformation point of one fire, and circularly forging for 2-3 times, wherein the single deformation is 15% -50%;
step 4), forging in two-phase region
Forging for 2-6 times after heating at 30-60 ℃ below the beta phase transition point, wherein the single upsetting deformation is controlled to be 30% -50%;
step 5), forming forging
And heating the steel bar at 20-50 ℃ below the beta phase transition point, and then forging and forming the steel bar with 1-3 times of fire, wherein the single deformation is controlled to be 10% -30%, and the steel bar with the diameter of 450-550mm is obtained.
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