CN116770116A - Weak texture TA18 titanium alloy bar and preparation method thereof - Google Patents
Weak texture TA18 titanium alloy bar and preparation method thereof Download PDFInfo
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- CN116770116A CN116770116A CN202311034491.7A CN202311034491A CN116770116A CN 116770116 A CN116770116 A CN 116770116A CN 202311034491 A CN202311034491 A CN 202311034491A CN 116770116 A CN116770116 A CN 116770116A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000005242 forging Methods 0.000 claims abstract description 103
- 238000003723 Smelting Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000010304 firing Methods 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 18
- 238000004321 preservation Methods 0.000 claims description 16
- 229920000742 Cotton Polymers 0.000 claims description 15
- 238000005498 polishing Methods 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 241000755266 Kathetostoma giganteum Species 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 229910000756 V alloy Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- HIMLGVIQSDVUJQ-UHFFFAOYSA-N aluminum vanadium Chemical compound [Al].[V] HIMLGVIQSDVUJQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 4
- 235000010215 titanium dioxide Nutrition 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Abstract
The invention belongs to the field of titanium alloy processing, and discloses a TA18 titanium alloy bar with weak texture and a preparation method thereof, wherein the preparation method comprises the steps of preparing a TA18 titanium alloy consumable electrode; carrying out twice vacuum consumable smelting on the consumable electrode to obtain an ingot; and forging the cast ingot for three times by adopting diagonal drawing and reversing upsetting drawing to obtain the TA18 titanium alloy bar with the weak texture. According to the invention, the TA18 titanium alloy bar is prepared by optimizing the smelting and forging processes of the TA18 titanium alloy and adopting diagonal drawing and reversing upsetting, the prepared bar has uniform structure at each part, is an equiaxial structure, has no obvious elongated structure, is scattered and random in orientation distribution, has weaker bar structure, is beneficial to control of seamless tube structure in the later cold and hot processing process, and can provide blanks for preparing TA18 titanium alloy seamless tubes for aviation high pressure.
Description
Technical Field
The invention belongs to the field of titanium alloy processing, and particularly relates to a TA18 titanium alloy bar with a weak texture and a preparation method thereof.
Background
TA18 (Ti-3 Al-2.5V) is a near alpha titanium alloy developed at the end of the year 60 of the U.S. 20 century, was developed for the application of aircraft pipeline pressurization systems in the early stage, has good room temperature, high temperature mechanical properties and corrosion resistance, is more expensive, and has excellent cold and hot working process plasticity, formability and weldability; in addition, the TA18 titanium alloy is insensitive to gaps, has excellent matching with the strength and the rigidity of the composite material, and can further obtain a good weight reduction effect. Therefore, the TA18 titanium alloy can be used for manufacturing parts with working temperature reaching 315 ℃ and certain strength and oxidation resistance requirements, for example, the TA18 titanium alloy seamless pipe is suitable for being used as a high-pressure resistant and light hydraulic and fuel oil pipeline system on an airplane and an engine in the aspect of aerospace. The TA18 titanium alloy bar produced by forging or rolling at present often has stronger texture, strengthens the anisotropy of the bar, and is not beneficial to use in some special environments.
Therefore, it is necessary to provide a preparation method of a TA18 titanium alloy bar with weak texture, which weakens the anisotropy of the bar and is beneficial to the control of the texture of the seamless tube in the later cold and hot processing process.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the TA18 titanium alloy bar with the weak texture and the preparation method thereof, so that the anisotropy of the bar is weakened, the bar is uniform in structure and weak in texture, and the control of the texture of the seamless tube in the later cold and hot processing process is facilitated.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the preparation method of the TA18 titanium alloy bar with the weak texture is characterized by comprising the following steps of:
adopting titanium sponge, aluminum-vanadium alloy, aluminum particles, titanium-iron alloy and titanium white to mix and press a plurality of electrode blocks, and welding the plurality of electrode blocks to obtain a consumable electrode;
carrying out twice vacuum consumable smelting on the consumable electrode to obtain an ingot;
forging the cast ingot in a first stage: performing three upsetting and three drawing on the ingot with even number of fires, wherein each upsetting and drawing with odd number of fires adopts diagonal drawing, each upsetting and drawing with even number of fires adopts reversing upsetting and drawing, air cooling after forging, and polishing to obtain a primary forging blank;
forging the primary forging blank in a second stage: performing three upsetting and three drawing on the primary forging blank with even number of fires, wherein each upsetting and drawing with odd number of fires adopts diagonal drawing, each upsetting and drawing with even number of fires adopts reversing upsetting and drawing, adding heat-insulating cotton below and above the primary forging blank in the upsetting and drawing process, performing air cooling after forging, and polishing to obtain a secondary forging blank;
forging the secondary forging blank in a third stage: and drawing the secondary forging blank to eight directions by the first firing, and rounding the secondary forging blank by adopting a tool and die by the second firing to obtain the TA18 titanium alloy bar.
Further, performing twice vacuum consumable smelting on the consumable electrode, including:
the parameters of the first vacuum consumable smelting include: the smelting voltage is 21-31V, the smelting current is 3-5kA, the vacuum degree is less than or equal to 1.0Pa, and the vacuum leakage rate is less than or equal to 1.0Pa/min.
Further, the method for carrying out twice vacuum consumable smelting on the consumable electrode further comprises the following steps:
the parameters of the secondary vacuum consumable smelting include: the smelting voltage is 26-30V, the smelting current is 4-6kA, the vacuum degree is less than or equal to 1.0Pa, and the vacuum leakage rate is less than or equal to 1.0Pa/min.
Further, before performing three upsetting three drawing on the ingot with even number of fires, the method comprises the following steps:
peeling and flattening the cast ingot, and preserving heat for 1 hour at 800 ℃;
before three upsetting and three pulling out each time, the temperature of the cast ingot is raised to 930-1150 ℃ and the heat preservation time is 3-4 hours.
Further, before performing three upsetting three drawing for an even number of times on a forging blank, it includes:
and before three upsetting and three drawing steps are performed on each time, the forging blank is subjected to heat preservation for 2.5-4 hours at 870-920 ℃.
Further, the upsetting deformation of the diagonal drawing is 35-50%, and the upsetting deformation of the reversing upsetting is 40-60%.
Further, the second forging blank is subjected to third stage forging including:
controlling the forging deformation of the third stage to be less than or equal to 35 percent.
Further, before the second forging stock is drawn to eight directions by the first firing time, the method comprises:
and (3) preserving the temperature of the secondary forging blank for 2-3 hours at 830-900 ℃.
Further, before the second firing uses the tooling to round the secondary forging blank, the method comprises:
the tooling was preheated to 350-450 ℃.
On the other hand, the invention discloses a TA18 titanium alloy bar with weak texture, which is prepared by adopting the method.
The invention has the technical effects and advantages that:
according to the invention, the TA18 titanium alloy bar is prepared by optimizing the smelting and forging processes of the TA18 titanium alloy and adopting diagonal drawing and reversing upsetting, the prepared bar has uniform structure at each part, is an equiaxial structure, has no obvious elongated structure, is scattered and random in orientation distribution, has weaker bar structure, is beneficial to control of seamless tube structure in the later cold and hot processing process, and can provide blanks for preparing TA18 titanium alloy seamless tubes for aviation high pressure.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a flow chart of a method for preparing a TA18 titanium alloy bar with weak texture;
FIG. 2 is a drawing showing the microstructure of a TA18 rod of phi 90mm gauge according to example 1 of the present invention;
FIG. 3 is a transverse metallographic view of the edges of the TA18 bar of phi 90mm gauge of example 1 of the present invention;
FIG. 4 is a 1/2 radius transverse metallographic structure diagram of a TA18 bar with a phi 90mm specification of example 1 of the present invention;
FIG. 5 is a center transverse metallographic structure diagram of a TA18 bar with a phi 90mm specification of example 1 of the present invention;
FIG. 6 is a longitudinal metallographic view of the edges of a TA18 bar of phi 90mm gauge according to example 1 of the present invention;
FIG. 7 is a 1/2 radius longitudinal metallographic structure diagram of a TA18 bar with a phi 90mm specification of example 1 of the present invention;
FIG. 8 is a center longitudinal metallographic view of a TA18 bar of phi 90mm gauge of example 1 of the present invention;
FIG. 9 is a texture pole diagram of a TA18 bar of phi 90mm gauge of example 1 of the present invention;
FIG. 10 is a drawing showing the microstructure of a TA18 rod of 150mm diameter in accordance with example 2 of the present invention;
FIG. 11 is a transverse metallographic view of the edges of a TA18 bar of 150mm phi gauge according to example 2 of the present invention;
FIG. 12 is a 1/2 radius transverse metallographic structure diagram of a TA18 bar with a phi 150mm specification of example 2 of the present invention;
FIG. 13 is a center transverse metallographic view of a TA18 rod of 150mm gauge phi in example 2 of the present invention;
fig. 14 is an edge longitudinal metallographic structure diagram of TA18 bar with phi 150mm specification of example 2 of the present invention;
FIG. 15 is a 1/2 radius longitudinal metallographic structure of TA18 bar with 150mm phi specification of example 2 of the present invention;
FIG. 16 is a center longitudinal metallographic view of a TA18 rod of 150mm gauge phi according to example 2 of the present invention;
fig. 17 is a texture pole diagram of TA18 bar with a phi 150mm specification of example 2 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the invention provides a preparation method of a TA18 titanium alloy bar with weak texture, which comprises the following steps:
adopting titanium sponge, aluminum-vanadium alloy, aluminum particles, titanium-iron alloy and titanium white to mix and press a plurality of electrode blocks, and welding the plurality of electrode blocks to obtain a consumable electrode;
carrying out twice vacuum consumable smelting on the consumable electrode to obtain an ingot;
forging the cast ingot in a first stage: performing three upsetting and three drawing on the ingot with even number of fires, wherein each upsetting and drawing with odd number of fires adopts diagonal drawing to ensure that crystal grains are broken to a greater extent, each upsetting and drawing with even number of fires adopts reversing upsetting and drawing to weaken anisotropy of the blank, and performing air cooling and polishing after forging to obtain a forged blank;
forging the primary forging blank in a second stage: carrying out three upsetting and three drawing on the primary forging blank for even number of times, wherein each upsetting and drawing for odd number of times adopts diagonal drawing, each upsetting and drawing for even number of times adopts reversing upsetting and drawing, adding heat-insulating cotton below and above the primary forging blank in the upsetting and drawing process, carrying out air cooling after forging, and polishing to obtain a secondary forging blank;
forging the secondary forging blank in a third stage: and drawing the secondary forging blank to eight directions by the first firing, and rounding the secondary forging blank by adopting a tool and die by the second firing to obtain the TA18 titanium alloy bar.
In some embodiments of the invention, the twice vacuum consumable smelting of the consumable electrode comprises:
the parameters of the first vacuum consumable smelting include: the smelting voltage is 21-31V, the smelting current is 3-5kA, the vacuum degree is less than or equal to 1.0Pa, and the vacuum leakage rate is less than or equal to 1.0Pa/min.
In some embodiments of the invention, the consumable electrode is subjected to two times of vacuum consumable smelting, further comprising:
the parameters of the secondary vacuum consumable smelting include: the smelting voltage is 26-30V, the smelting current is 4-6kA, the vacuum degree is less than or equal to 1.0Pa, and the vacuum leakage rate is less than or equal to 1.0Pa/min.
In some embodiments of the invention, prior to performing an even fire triple heading triple pull on the ingot, the method comprises:
peeling and flattening the cast ingot, and preserving heat for 1 hour at 800 ℃;
before three upsetting and three pulling out each time, the temperature of the cast ingot is raised to 930-1150 ℃ and the heat preservation time is 3-4 hours.
In some embodiments of the invention, prior to performing three upsets and three drawing for an even number of fires on a single forging blank, the method comprises:
the primary forging blank is kept at 870-920 ℃ for 2.5-4h.
In some embodiments of the invention, the diagonally drawn down upsetting amount is 35-50% and the reverse upsetting amount is 40-60%.
In some embodiments of the invention, the third stage forging of the secondary forging stock includes:
controlling the forging deformation of the third stage to be less than or equal to 35 percent.
In some embodiments of the invention, prior to drawing the secondary forging stock to eight directions at the first firing time, comprising:
and (3) preserving the temperature of the secondary forging blank for 2-3 hours at 830-900 ℃.
In some embodiments of the invention, prior to the second firing the secondary forging blank is rounded with a tooling, comprising:
the tooling was preheated to 350-450 ℃.
On the other hand, the invention discloses a TA18 titanium alloy bar with weak texture, which is prepared by adopting the method.
For a better illustration of the present solution, the following examples are also provided.
Example 1
And (3) producing the TA18 titanium alloy bar with the specification of phi 90 mm.
S1: according to the required elements of TA18 titanium alloy, sponge titanium, aluminum vanadium alloy, aluminum particles, ferrotitanium alloy and titanium white powder are mixed, pressed and welded into the phi 140mm consumable electrode.
S2: carrying out primary vacuum consumable smelting under the smelting voltage of 21-31V and the smelting current of 3-5kA to obtain primary cast ingots with phi of 190mm, wherein the vacuum degree is less than or equal to 1.0Pa and the vacuum leakage rate is less than or equal to 1.0Pa/min before power transmission smelting;
and carrying out secondary vacuum consumable smelting on the primary ingot with the diameter of 190mm under the smelting voltage of 26-30V and the smelting current of 4-6kA to obtain the ingot with the diameter of 250mm, wherein the vacuum degree is less than or equal to 1.0Pa and the vacuum leakage rate is less than or equal to 1.0Pa/min before power transmission smelting.
S3: peeling off and flathead treatment is carried out on the cast ingot with the diameter of phi 250mm, the flathead end is 20mm, the outer diameter is peeled off and the cast ingot with the diameter of phi 240mm is obtained;
then forging a phi 240mm cast ingot in a first stage, performing three upsetting three drawing steps on the first firing time, insulating the phi 240mm cast ingot at 800 ℃ for 1 hour, then insulating the cast ingot at 1150 ℃ for 3 hours, drawing the cast ingot three upsetting three to phi 230mm, drawing the cast ingot by diagonal drawing each time, and performing air cooling and grinding after forging, wherein the deformation of each time of upsetting is 35%; and (3) carrying out three upsetting and three drawing on the second fire time, wherein the phi 230mm square billet is subjected to heat preservation at 800 ℃ for 1 hour, then subjected to heat preservation at 930 ℃ for 3 hours, the three upsetting and three drawing are carried out to obtain a phi 230mm once forged billet, each drawing adopts reversing upsetting and drawing (one upsetting and drawing are carried out along three directions of a space coordinate axis of the billet), each time of upsetting deformation is 40%, and the billet is subjected to air cooling and grinding after forging.
S4: performing second-stage forging on a primary forging blank with the diameter of 230mm, performing three upsetting and three drawing steps after the primary forging blank with the diameter of 230mm is subjected to heat preservation at 920 ℃ for 2.5 hours at the first firing time, performing upsetting and drawing to the diameter of 230mm at the first two times, performing upsetting and drawing to the diameter of 180mm at the third time, pre-placing a piece of heat-preserving cotton on an anvil during forging, additionally placing a piece of heat-preserving cotton above the primary forging blank before upsetting, performing diagonal drawing for each drawing, performing air cooling after forging, and grinding; and (3) insulating a square billet with the diameter of 180mm at 870 ℃ for 2.5 hours at the second firing time, performing three upsetting and three drawing steps, upsetting and drawing the square billet to the diameter of 180mm at the first two times, performing three upsetting and drawing steps to obtain a square billet with the diameter of 120mm at the third upsetting and drawing steps, pre-placing a piece of insulating cotton on an anvil during forging, placing another piece of insulating cotton above the square billet before upsetting, performing reverse upsetting and drawing (performing one upsetting and drawing step along three directions of a space coordinate axis of the billet), performing air cooling after forging, and grinding each time, wherein the upsetting deformation is 40%.
S5: and forging the phi 120mm secondary forging blank in a third stage, wherein the first firing time is to heat-preserving the phi 120mm secondary forging blank at 860 ℃ for 2 hours, drawing the blank to phi 110mm with the deformation of 30 percent, the second firing time is to heat-preserving the blank at 830 ℃ for 2 hours, the blank is round-cast and drawn into a phi 95mm bar by adopting a tool and die preheated to 350 ℃, the deformation of 29 percent, and the forging is carried out by adopting air cooling, so that the TA18 alloy bar with the finished product specification of phi 90mm is obtained after machining.
FIG. 2 is a drawing showing the microstructure of the TA18 alloy bar with the specification phi 90mm, which is prepared by the method, wherein no obvious metallurgical defects exist at low magnification, and the microstructure is uniform and takes the form of fuzzy crystals.
Fig. 3, fig. 4 and fig. 5 are respectively transverse metallographic structures of the edge, 1/2 radius and center of the TA18 alloy bar with the phi 90mm specification prepared by the embodiment, and the structures of all parts are very uniform and are equiaxed structures.
Fig. 6, 7 and 8 are respectively longitudinal metallographic structures of the edge, 1/2 radius and center of the TA18 alloy bar with phi 90mm specification prepared by the embodiment, and the structures of all parts are very uniform and are equiaxed structures without obvious elongation structures.
Fig. 9 is a texture polar diagram of a TA18 alloy bar with a phi 90mm specification, which is prepared in the embodiment, and the orientation distribution in the polar diagram can be found to be scattered and random, which indicates that the bar texture is weaker.
Example 2
And (3) producing the TA18 titanium alloy bar with the specification of phi 150 mm.
S1: according to the required elements of TA18 titanium alloy, sponge titanium, aluminum vanadium alloy, aluminum particles, ferrotitanium alloy and titanium white powder are mixed, pressed and welded into the phi 140mm consumable electrode.
S2: carrying out primary vacuum consumable smelting under the smelting voltage of 21-31V and the smelting current of 3-5kA to obtain primary cast ingots with phi of 190mm, wherein the vacuum degree is less than or equal to 1.0Pa and the vacuum leakage rate is less than or equal to 1.0Pa/min before power transmission smelting;
and carrying out secondary vacuum consumable smelting on the primary ingot with the diameter of 190mm under the smelting voltage of 26-30V and the smelting current of 4-6kA to obtain the ingot with the diameter of 250mm, wherein the vacuum degree is less than or equal to 1.0Pa and the vacuum leakage rate is less than or equal to 1.0Pa/min before power transmission smelting.
S3: peeling off and flathead treatment is carried out on the cast ingot with the diameter of phi 250mm, the flathead end is 20mm, the outer diameter is peeled off and the cast ingot with the diameter of phi 240mm is obtained;
then forging a phi 240mm cast ingot in a first stage, performing three upsetting three drawing steps on the first firing time, insulating the phi 240mm cast ingot at 800 ℃ for 1 hour, then insulating the cast ingot at 1150 ℃ for 4 hours, drawing the cast ingot three upsetting three to phi 230mm, drawing the cast ingot by diagonal drawing each time, wherein the upsetting deformation amount is 50% each time, and performing air cooling and grinding after forging; and (3) carrying out three upsetting and three drawing on the second fire time, wherein the phi 230mm square billet is subjected to heat preservation at 800 ℃ for 1 hour, then subjected to heat preservation at 930 ℃ for 4 hours, the three upsetting and three drawing are carried out to obtain a phi 230mm once forged billet, each drawing adopts reversing upsetting and drawing (one upsetting and drawing are carried out along three directions of a space coordinate axis of the billet), each time of upsetting deformation is 60%, and the billet is subjected to air cooling and grinding after forging.
S4: performing second-stage forging on a primary forging blank with the diameter of 230mm, performing three upsetting and three drawing to the diameter of 230mm after the primary forging blank with the diameter of 230mm is subjected to heat preservation at 920 ℃ for 4 hours at the first firing time, pre-placing a piece of heat preservation cotton on an anvil during forging, additionally placing a piece of heat preservation cotton above the primary forging blank before upsetting, performing diagonal drawing for each drawing, performing air cooling after forging for each upsetting deformation of 50%, and polishing; the second firing time is to heat-preserving the square billet with the diameter of phi 230mm for 4 hours at the temperature of 920 ℃, three upsetting steps are carried out until the diameter of phi 230mm is reached, a piece of heat-preserving cotton is put on the anvil in advance during forging, a piece of heat-preserving cotton is put on the square billet in addition before upsetting, each time of drawing adopts reversing upsetting (one upsetting step is carried out along three directions of a blank space coordinate axis), each time of upsetting deformation is 50% (40-60), air cooling is carried out after forging, and grinding is carried out; after heat preservation for 4 hours at 910 ℃ for a square billet with phi of 230mm, carrying out three upsetting and three drawing to lead to phi of 230mm, pre-placing a piece of heat preservation cotton on an anvil during forging, additionally placing a piece of heat preservation cotton above a forging blank before upsetting, drawing diagonally for each time, carrying out air cooling after forging, and grinding; and (3) preserving heat of a square billet with the diameter of 230mm for 4 hours at 900 ℃ for three upsetting and three drawing steps, upsetting and drawing the square billet with the diameter of 230mm for the first two times, forging the square billet with the diameter of 200mm for the third time, pre-placing a piece of heat-preserving cotton on an anvil during forging, placing another piece of heat-preserving cotton above the square billet before upsetting, drawing each time by adopting reversing upsetting and drawing (upsetting and drawing are carried out for one time along three directions of a space coordinate axis of the billet), and carrying out air cooling and grinding after forging when the upsetting deformation amount is 60% each time.
S5: and forging the phi 200mm secondary forging blank in a third stage, wherein the first firing time is to keep the temperature of the phi 200mm secondary forging blank at 900 ℃ for 3 hours, pull the blank to be phi 180mm, the deformation is 33%, the second firing time is to keep the temperature at 850 ℃ for 3 hours, the blank is cast and pulled into a phi 155mm bar by adopting a tool and die preheated to 450 ℃, the deformation is 30%, and the forging is carried out by adopting air cooling, so that the TA18 alloy bar with the finished product specification of phi 150mm is obtained after machining.
FIG. 10 is a drawing showing the microstructure of a TA18 alloy bar with a phi 150mm specification, which is prepared in the embodiment, and has no obvious metallurgical defects at low magnification, uniform microstructure and fuzzy crystal.
Fig. 11, fig. 12 and fig. 13 are respectively transverse metallographic structures of the edge, 1/2 radius and center of the TA18 alloy bar with the phi 150mm specification, which is prepared by the embodiment, and the structures of all parts are very uniform and are equiaxed structures.
Fig. 14, 15 and 16 are respectively longitudinal metallographic structures of the edge, 1/2 radius and center of the TA18 alloy bar with phi 90mm specification prepared by the embodiment, and the structures of all the parts are very uniform and are equiaxed structures without obvious elongation structures.
Fig. 17 is a texture polar diagram of a TA18 alloy bar with a phi 150mm specification, which is prepared in this example, and the orientation distribution in the polar diagram can be found to be scattered and random, which indicates that the bar texture is weaker.
In summary, the TA18 titanium alloy bar is prepared by optimizing smelting and forging processes of the TA18 titanium alloy and adopting diagonal drawing and reversing upsetting, the prepared bar has uniform structure of all parts, is an equiaxial structure, has no obvious elongated structure, has scattered and random orientation distribution, has weaker bar texture, is beneficial to control of the seamless tube texture in the later cold and hot processing process, and can provide blanks for preparing the TA18 titanium alloy seamless tube for aviation high pressure.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. The preparation method of the TA18 titanium alloy bar with the weak texture is characterized by comprising the following steps of:
mixing titanium sponge, aluminum-vanadium alloy, aluminum particles, titanium-iron alloy and titanium dioxide to press a plurality of electrode blocks, and welding a plurality of electrode blocks to obtain a consumable electrode;
carrying out twice vacuum consumable smelting on the consumable electrode to obtain an ingot;
forging the cast ingot in a first stage: performing three upsetting and three drawing on the ingot with even number of fires, wherein each upsetting and drawing with odd number of fires adopts diagonal drawing, each upsetting and drawing with even number of fires adopts reversing upsetting and drawing, air cooling after forging, and polishing to obtain a primary forging blank;
forging the primary forging blank in a second stage: performing three upsetting and three drawing on the primary forging blank for even number of times, wherein each upsetting and drawing for odd number of times adopts diagonal drawing, each upsetting and drawing for even number of times adopts reversing upsetting and drawing, heat-insulating cotton is added below and above the primary forging blank in the upsetting and drawing process, and after forging, air cooling and polishing are performed to obtain a secondary forging blank;
and forging the secondary forging blank in a third stage: and drawing the secondary forging blank to eight directions by the first firing time, and rounding the secondary forging blank by adopting a tool and die by the second firing time to obtain the TA18 titanium alloy bar.
2. The method for preparing a TA18 titanium alloy bar with weak texture according to claim 1, wherein the twice vacuum consumable smelting of the consumable electrode comprises:
the parameters of the first vacuum consumable smelting include: the smelting voltage is 21-31V, the smelting current is 3-5kA, the vacuum degree is less than or equal to 1.0Pa, and the vacuum leakage rate is less than or equal to 1.0Pa/min.
3. The method for preparing a TA18 titanium alloy bar with weak texture according to claim 2, wherein the twice vacuum consumable smelting is performed on the consumable electrode, further comprising:
the parameters of the secondary vacuum consumable smelting include: the smelting voltage is 26-30V, the smelting current is 4-6kA, the vacuum degree is less than or equal to 1.0Pa, and the vacuum leakage rate is less than or equal to 1.0Pa/min.
4. The method for preparing a TA18 titanium alloy bar with weak texture according to claim 1, wherein before the three upsetting three drawing steps are performed on the ingot for even number of times, the method comprises the following steps:
peeling and flathead treatment are carried out on the cast ingot, and the cast ingot is kept at 800 ℃ for 1 hour;
before three upsetting and three pulling out each time, the cast ingot is heated to 930-1150 ℃ and the heat preservation time is 3-4 hours.
5. The method for producing a TA18 titanium alloy bar with weak texture according to claim 4, comprising, before said three upsetting three drawing steps for an even number of fires of said one forging stock:
and before three upsetting and three drawing steps are performed on each time, the primary forging blank is subjected to heat preservation for 2.5-4 hours at 870-920 ℃.
6. The method for preparing the TA18 titanium alloy bar with weak texture according to claim 5, which is characterized in that,
the upsetting deformation of the opposite angle drawing is 35-50%, and the upsetting deformation of the reversing upsetting is 40-60%.
7. The method for producing a TA18 titanium alloy bar with weak texture according to any one of claims 1 to 6, wherein said performing a third stage forging on said secondary forging stock comprises:
controlling the forging deformation of the third stage to be less than or equal to 35 percent.
8. The method for producing a weakly textured TA18 titanium alloy bar according to claim 7, wherein prior to the drawing the secondary forging stock to eight directions at the first firing rate, comprising:
and (3) preserving the temperature of the secondary forging blank for 2-3 hours at 830-900 ℃.
9. The method for producing a TA18 titanium alloy bar with weak texture according to claim 8, wherein before the second firing uses a tool and die to round the secondary forging stock, comprising:
the tooling was preheated to 350-450 ℃.
10. A weakly textured TA18 titanium alloy bar, characterized in that the TA18 titanium alloy bar is produced by the method of any one of claims 1-9.
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