CN114406169B - Processing method of two-phase titanium alloy large-size plate - Google Patents
Processing method of two-phase titanium alloy large-size plate Download PDFInfo
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- CN114406169B CN114406169B CN202210039240.7A CN202210039240A CN114406169B CN 114406169 B CN114406169 B CN 114406169B CN 202210039240 A CN202210039240 A CN 202210039240A CN 114406169 B CN114406169 B CN 114406169B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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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- Forging (AREA)
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Abstract
The application discloses a processing method of a two-phase titanium alloy large-size plate, which adopts a recrystallization circulation reversing upsetting forging mode and a reversing large-deformation hot rolling combined hot processing technology: the titanium alloy plate is prepared by adopting reversing upsetting forging and large-deformation reversing rolling processing with the alloy phase transition point as a reference and adopting gradual decreasing and increasing cyclic heating. The adoption of recrystallization circulation reversing upsetting forging avoids uneven forging blank structure caused by forging deformation dead zones, optimizes the uniformity of internal structure of the blank, fully breaks structure grains and obtains a binary structure form of primary alpha equiaxial; the reversing hot rolling with large deformation avoids the problems of transverse and longitudinal structure difference and uneven grain elongation caused by the traditional unidirectional rolling. By the technical scheme of the application, the two-phase titanium alloy structure is fully thinned, the (alpha+beta) equiaxial structure is obtained, and the transverse and longitudinal structures are consistent with the mechanical properties, so that the method is completely suitable for the performance requirements of structural members on alloy plates.
Description
Technical Field
The invention belongs to the technical field of titanium alloy plate preparation methods, and particularly relates to a processing method of a two-phase titanium alloy large-size plate.
Background
Titanium and titanium alloy have lower elastic modulus, corrosion resistance and excellent biological and mechanical compatibility, and are widely applied in the fields of aerospace and ocean engineering.
The two-phase titanium alloy large-size plate is widely applied to the field of aviation large aircrafts and ocean engineering at present, is used for manufacturing large-size bearing structural members, has extremely high requirements on the performance and the safety reliability of titanium alloy materials, and therefore, has high level requirements on the manufacturing process and the performance of the materials.
In general, large-size plates refer to plates with thickness larger than 10mm, length and width larger than 1000mm and monomer weight larger than 50kg, so that for a material processing and forming process, on one hand, the size is ensured, and more importantly, the internal organization and comprehensive mechanical properties of the material are ensured.
The two-phase titanium alloy consists of two phases (alpha and beta), and the thermal processing temperature window is narrow, the thermoplastic processing capacity below the phase transition point is limited, the structure and the performance of the titanium alloy are mainly controlled in the thermal processing process, and the technical difficulty is that how to obtain the whole structure uniformity and the sheet isotropy in the processing process for the large-size titanium alloy sheet.
Disclosure of Invention
Based on the problems, the application provides a processing method of a two-phase titanium alloy large-size plate, which can enable the large-size titanium alloy plate to obtain the uniformity of the whole structure and the isotropy of the plate through recrystallization forging.
The processing method of the two-phase titanium alloy large-size plate provided by the application is realized by the following technical scheme:
A processing method of a two-phase titanium alloy large-size plate comprises the following steps:
step one: obtaining a two-phase titanium alloy columnar ingot;
Step two: performing recrystallization upsetting forging treatment on the columnar ingot to obtain a plate blank;
step three: rolling the slab to obtain a semi-finished product;
step four: finishing the semi-finished product to obtain a titanium alloy finished product plate;
wherein, recrystallization upsetting forging treatment includes:
forging by fire: heating the columnar ingot to Tbeta+120-150 ℃, and upsetting, drawing and forging the columnar ingot to obtain a first forging stock;
Forging by two fires: heating the first forging stock to Tbeta-10-30 ℃, upsetting, drawing and forging the first forging stock to obtain a second forging stock;
Three-fire forging: placing the second forging stock in a condition of heating to Tbeta+10-30 ℃, and upsetting, drawing and forging the second forging stock to obtain a third forging stock;
and obtaining the slab according to the third forging stock.
In one possible implementation, the one-fire forging further includes:
after the columnar ingot is heated to Tbeta+120-150 ℃, upsetting, drawing and forging the columnar ingot to obtain a first forging stock, sawing and cutting the first forging stock into two parts with equal weight, heating to Tbeta+50-100 ℃, and upsetting, drawing and forging the first forging stock.
In one possible implementation manner, the obtaining the slab according to the third forging stock includes:
Forging with four fires: heating the third forging stock to Tbeta-10-30 ℃, carrying out reversing upsetting and drawing forging on the third forging stock, repeating the reversing upsetting and drawing forging twice, and beating the upsetting and drawing forged third forging stock into a plate shape to obtain a fourth forging stock;
forging with five fires: and heating the fourth forging stock to Tbeta-30-50 ℃, performing drawing forging on the fourth forging stock, and beating the fourth forging stock after drawing forging into a plate shape to obtain the slab.
In one possible implementation, the slab has a thickness of 150 to 180mm, a width of 700 to 800mm, and a length of 1000 to 1200mm.
In one possible implementation, the upsetting, drawing and forging the columnar ingot includes:
and repeatedly reversing, upsetting, drawing and forging the columnar cast ingot, and performing four-edge reverse octagon treatment to obtain the first forging stock with the shape of an octagon cylinder.
In one possible implementation, the rolling is reversing rolling, and the third step includes:
Heating the slab to Tbeta-50-60 ℃ by one fire, rolling the slab, and trisecting the slab in the length direction to obtain a first rolled piece;
and (3) rolling by two fires, heating the first rolled piece to Tbeta-70-80 ℃, and reversing and rolling the first rolled piece of the plate to obtain the semi-finished product.
In one possible implementation manner, the step four includes:
performing heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment comprises: preserving heat at 800-820 ℃ for 30-75min, cooling to 700-720 ℃ and preserving heat for 60-90min;
Discharging from the furnace, and performing annealing leveling treatment;
And carrying out air cooling and machining treatment on the semi-finished product to obtain the titanium alloy finished product plate.
In one possible implementation, the columnar ingot is a tri-VAR titanium alloy ingot of Φ620- Φ720 mm.
Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:
1. The invention adopts a recrystallization circulation reversing upsetting mode, namely: multi-fire forging of temperature steps step by step above a transformation point, equiaxial forging of a structure below the transformation point, homogenizing forging at the temperature above the transformation point, avoiding structure non-uniformity caused by a local deformation dead zone formed by the previous forging, optimizing the internal structure uniformity of a blank, and forging step by step at the temperature below the transformation point; meanwhile, unlike the conventional upsetting and drawing, the invention increases the forging deformation ratio by upsetting and drawing in a reversing manner, improves the forging permeability, fully breaks the structure grains, obtains the binary structure form of the primary alpha equiaxed, and achieves the A1 level of flaw detection.
2. In order to solve the problems that longitudinal alpha grains of a plate are in an elongated state and are not broken and spheroidized, and coarse and elongated grain structures are not uniform due to the fact that the conventional unidirectional rolling is adopted, the large-deformation cogging hot rolling is adopted, the finish rolling of a reversing finished product is carried out, the grain size is fully refined, uniform equiaxed structures are obtained, the transverse and longitudinal section structures are basically consistent with mechanical properties, and the method is completely suitable for the requirements of engineering structural members on two-phase titanium alloy large-size plates.
The blank with the thickness of 3.150-180 mm can be rolled into a finished product with the thickness of 10-25 mm through two rolling fires, compared with the traditional three-fire hot rolling mode, one rolling fire is reduced, the production efficiency and the yield are improved, the production cost is reduced, and the method is suitable for commercial popularization and application.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and examples.
FIG. 1 is a flowchart I of a method for processing a two-phase titanium alloy large-size sheet material according to an embodiment of the present invention;
FIG. 2 is a second flowchart of a method for processing a two-phase titanium alloy large-size plate according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a recrystallization reverse upsetting forging deformation;
FIG. 4 is a schematic diagram of the heating temperature of recrystallization reverse upsetting forging;
FIG. 5 is a metallographic structure diagram of a cross section (b) of a titanium alloy slab (a) after conventional forging;
FIG. 6 is a metallographic structure diagram of a cross section (b) of a titanium alloy sheet (a) after conventional rolling;
FIG. 7 is a metallographic structure diagram of the longitudinal section position of the cross section (b) of the titanium alloy plate blank (a) after recrystallization cycle reverse upsetting forging provided by the embodiment of the invention;
FIG. 8 is a metallographic structure diagram of different positions of a cross section of a titanium alloy plate blank after recrystallization cycle reverse upsetting forging provided by the embodiment of the invention;
FIG. 9 is a metallographic structure diagram of a cross section (b) of a titanium alloy sheet (a) subjected to reversing rolling provided by the embodiment of the invention;
FIG. 10 is a schematic diagram comparing the performance of a titanium alloy sheet produced in a conventional manner with that of the present invention.
Detailed Description
The following detailed description, structural features and functions of the present invention are provided with reference to the accompanying drawings and examples in order to further illustrate the technical means and effects of the present invention to achieve the predetermined objects.
Example 1
The embodiment of the application provides a processing method of a two-phase titanium alloy large-size plate, as shown in fig. 1 and 2, which can comprise the following steps:
S110, obtaining a two-phase titanium alloy columnar ingot.
S111, recrystallizing, upsetting and forging the columnar ingot to obtain a plate blank.
And S112, rolling the slab to obtain a semi-finished product.
And S113, finishing the semi-finished product to obtain a titanium alloy finished product plate.
Wherein, the recrystallization upsetting forging the columnar ingot comprises:
forging by fire: heating the columnar ingot to Tbeta+120-150 ℃, and upsetting, drawing and forging the columnar ingot to obtain a first forging stock;
Forging by two fires: heating the first forging stock to Tbeta-10-30 ℃, upsetting, drawing and forging the first forging stock to obtain a second forging stock;
Three-fire forging: placing the second forging stock in a condition of heating to Tbeta+10-30 ℃, and upsetting, drawing and forging the second forging stock to obtain a third forging stock; and obtaining the slab according to the third forging stock.
In an embodiment of the present application, as an optional implementation manner, as shown in fig. 2, the step of one-fire forging may further include:
after the columnar ingot is heated to Tbeta+120-150 ℃, upsetting, drawing and forging the columnar ingot to obtain a first forging stock, sawing and cutting the first forging stock into two parts with equal weight, heating to Tbeta+50-100 ℃, and upsetting, drawing and forging the first forging stock.
In one example, after the first forging stock is obtained, the first forging stock may be sawn into a plurality of pieces with equal weight.
In the embodiment of the present application, as an example, the above-described recrystallization upsetting forging and slab rolling processes may be performed in a box resistance furnace.
In one example, one-shot forging may be performed by upsetting, drawing, and forging the columnar ingot with a 63MN rapid forging machine; the second-fire forging can use a 25MN rapid forging machine to perform reversing upsetting and drawing forging on the first forging stock.
In an embodiment of the present application, as an alternative implementation manner, after the three-fire forging, the method may further include:
forging with four fires: and heating the third forging stock to Tbeta-10-30 ℃, carrying out reversing upsetting and drawing forging on the third forging stock, repeating the reversing upsetting and drawing forging twice, and beating the upsetting and drawing forged third forging stock into a plate shape to obtain a fourth forging stock.
Forging with five fires: and heating the fourth forging stock to Tbeta-30-50 ℃, performing drawing forging on the fourth forging stock, and beating the fourth forging stock after drawing forging into a plate shape to obtain a plate blank.
The manner of performing the reverse upsetting-drawing forging on each forging stock is shown in a schematic diagram of recrystallization reverse upsetting-drawing forging deformation in fig. 3.
It should be noted that the steps of the four-fire forging and the five-fire forging described above may be performed a plurality of times after the three-fire forging step.
It should be noted that, referring to fig. 4, the temperatures corresponding to the first-fire forging are the temperatures of stage 1 and stage 2 in fig. 4, the temperatures corresponding to the second-fire forging are the temperatures of stage 3 in fig. 4, the temperatures corresponding to the third-fire forging are the temperatures of stage 4 in fig. 4, and the temperatures corresponding to the fourth-fire forging and the fifth-fire forging are the temperatures of stage 5 and stage 6 in fig. 4, respectively.
In the embodiment of the application, the thickness of the plate blank processed by the method is 150-180 mm, the width is 700-800 mm, and the length is 1000-1200 mm.
In an embodiment of the present application, as an alternative implementation manner, the upsetting and drawing process in the one-fire forging process may adopt a reversing upsetting and drawing manner.
In one example, the upsetting, drawing and forging the columnar ingot includes: and repeatedly reversing, upsetting, drawing and forging the columnar ingot blank, and performing four-edge inversion eight-direction treatment to obtain the first forging blank in the shape of an eight-direction long cylinder.
In one example, the rolling is reversing rolling, and the step three may include:
Heating the slab to Tbeta-50-60 ℃ by one fire, rolling the slab, and trisecting the slab in the length direction to obtain a first rolled piece;
and (3) rolling by two fires, heating the first rolled piece to Tbeta-70-80 ℃, and reversing and rolling the first rolled piece of the plate to obtain the semi-finished product.
In one example, the fourth step may include: performing heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment comprises: preserving heat at 800-820 ℃ for 30-75min, cooling to 700-720 ℃ and preserving heat for 60-90min;
Discharging from the furnace, and performing annealing leveling treatment;
And carrying out air cooling and machining treatment on the semi-finished product to obtain the titanium alloy finished product plate.
In the embodiment of the present application, the columnar ingot may be a cubic VAR titanium alloy ingot of (Φ620- Φ720) mm, as an example.
Example two
The method provided by the embodiment of the present application will be described in detail below by using specific examples.
In practical application, the method provided by the embodiment of the application can be implemented by adopting the following steps.
Step one, obtaining columnar cast ingots.
In an embodiment of the present application, as an example, the columnar ingot may be a TC4 titanium alloy ingot of Φ720mm three VAR.
And step two, recrystallizing, upsetting and forging the columnar ingot to obtain a plate blank.
In an embodiment of the present application, the recrystallization upsetting forging may include:
Forging by fire: taking a columnar ingot blank 1.5T, placing the columnar ingot blank in a box-type resistance furnace, heating the columnar ingot blank to 1139 ℃ (Tbeta=983 ℃), upsetting, drawing and forging the columnar ingot blank by using a 63MN rapid forging machine (drawing from the other direction after upsetting), repeating reversing, upsetting, drawing and forging three times, and forging four sides into a rectangular column in an eight directions to obtain a first forging blank; the first forging stock is sawed into two parts of 0.75T, the two parts are placed in a box-type resistance furnace, the box-type resistance furnace is heated to 1060 ℃, a 25MN rapid forging machine is used for conducting reversing upsetting and drawing forging on the first forging stock (the upsetting needs to be drawn from the other direction), and the reversing upsetting and drawing forging is repeated for three times.
Forging by two fires: and (3) placing the first forging stock in a box-type resistance furnace, heating to 965 ℃, and carrying out reversing upsetting and drawing forging on the first forging stock by using a 25MN quick forging machine to obtain a second forging stock.
Three-fire forging: and (3) placing the second forging stock in a box-type resistance furnace, heating to 1000 ℃, and carrying out reversing upsetting and drawing forging on the second forging stock by using a 25MN quick forging machine to obtain a third forging stock.
Forging with four fires: placing the third forging stock in a box-type resistance furnace, heating to 960 ℃, carrying out reversing upsetting and drawing forging on the third forging stock by using a 25MN rapid forging machine, repeating the reversing upsetting and drawing forging twice, and beating the upsetting and drawing forged third forging stock into a plate shape to obtain a fourth forging stock; the thickness of the fourth forging stock is 210mm.
Forging with five fires: placing the fourth forging stock in a box-type resistance furnace, heating to 950 ℃, performing drawing forging on the fourth forging stock by using a 25MN rapid forging machine, beating the fourth forging stock after drawing forging into a plate shape, and machining blank blanks to obtain the blank; wherein, the thickness of slab is 150mm, and the width is 800mm, and length is 1200mm.
And thirdly, rolling the slab to obtain a semi-finished product.
In an embodiment of the present application, step three may include:
Rolling by fire: placing the slab in a box-type resistance furnace, heating to 930 ℃, rolling the slab into 3600mm with the size of 50mm x 800mm, and trisecting according to the length direction to obtain a first rolled piece;
And (3) rolling by two fires: and (3) placing the first rolled piece in a box-type resistance furnace, heating to 910 ℃, reversing and rolling the first rolled piece into a rolled piece with the size of 15mm or 1200mm or 2667mm, and obtaining a second rolled piece, namely the two-phase titanium alloy plate semi-finished product.
And step four, finishing the semi-finished product to obtain a titanium alloy finished product plate.
In an embodiment of the present application, as an example, the finishing process may include:
Performing heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment process comprises: the semi-finished product is kept at 820 ℃ for 45min, cooled to 720 ℃ for 60min, discharged from the furnace, and annealed and leveled;
And (3) performing air cooling and machining treatment on the semi-finished product to obtain a TC4 titanium alloy large-size plate finished product.
Other technical scheme details and technical effects of the embodiments of the present application can be referred to related descriptions in other embodiments of the present application, and are not repeated here.
Example III
The embodiment of the application also provides an optional implementation mode of the method. This embodiment includes the steps of:
Step one, obtaining columnar cast ingots.
In an embodiment of the application, the columnar ingot may be a TC11 titanium alloy ingot of a three-time VAR of phi 650mm, for example.
And step two, recrystallizing, cyclically upsetting and forging the columnar ingot to obtain a slab.
In an embodiment of the present application, the second step may include:
Forging by fire: taking 1.4T of columnar ingot blank, placing into a box-type resistance furnace, heating to 1170 ℃ (Tbeta)
Using a 63MN rapid forging machine to perform upsetting, drawing and forging (upsetting is performed with drawing from the other direction), repeating reversing, upsetting, drawing and forging three times, and four-edge inverted eight-direction forging to obtain a first forging blank; the first forging stock is sawed into two parts of 0.7T, the two parts are placed in a box-type resistance furnace, the box-type resistance furnace is heated to 1100 ℃, a 25MN rapid forging machine is used for carrying out reversing upsetting and drawing forging on the first forging stock (the upsetting needs to be drawn from the other direction), and the reversing upsetting and drawing forging is repeated for three times.
Forging by two fires: and placing the first forging stock in a box-type resistance furnace, heating to 1015 ℃, and carrying out reversing upsetting and drawing forging on the first forging stock by using a 25MN quick forging machine to obtain a second forging stock.
Three-fire forging: and (3) placing the second forging stock in a box-type resistance furnace, heating to 1050 ℃, and carrying out reversing upsetting and drawing forging on the second forging stock by using a 25MN quick forging machine to obtain a third forging stock.
Forging with four fires: placing the third forging stock in a box-type resistance furnace, heating to 1015 ℃, carrying out reversing upsetting and drawing forging on the third forging stock by using a 25MN rapid forging machine, repeating the reversing upsetting and drawing forging twice, and beating the upsetting and drawing forged third forging stock into a plate shape to obtain a fourth forging stock; the thickness of the fourth forging stock is 210mm.
Forging with five fires: placing the fourth forging stock in a box-type resistance furnace, heating to 990 ℃, performing drawing forging on the fourth forging stock by using a 25MN rapid forging machine, beating the fourth forging stock after drawing forging into a plate-like shape, and machining blank blanks to obtain the blank; wherein, the thickness of slab is 160mm, and the width is 750mm, and length is 1120mm.
And thirdly, rolling the slab to obtain a semi-finished product.
In an embodiment of the present application, the third step may include:
Rolling by fire: placing the slab in a box-type resistance furnace, heating to 975 ℃, rolling the slab into a size of 52mm x 750mm x 3446mm, and dividing the slab into four parts along the length direction to obtain a first rolled piece;
and (3) rolling by two fires: and (3) placing the first rolled piece in a box-type resistance furnace, heating to 960 ℃, reversing and rolling the first rolled piece into a rolled piece with the size of 18mm 1149mm 2167mm, and obtaining a second rolled piece, namely the two-phase titanium alloy plate semi-finished product.
And step four, finishing the semi-finished product to obtain a titanium alloy finished product plate.
In an embodiment of the present application, the fourth step may include:
Performing heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment process comprises: the semi-finished product is kept at 800 ℃ for 50min, furnace cooled to 700 ℃ for 90min,
Discharging from the furnace, and performing annealing leveling treatment;
and (3) performing air cooling and machining treatment on the semi-finished product to obtain a TC11 titanium alloy large-size plate finished product.
Other technical scheme details and technical effects of the embodiments of the present application can be referred to related descriptions in other embodiments of the present application, and are not repeated here.
Example IV
The embodiment of the application also provides another alternative implementation mode of the method. This embodiment includes the steps of:
step one, obtaining columnar cast ingots;
specifically, the columnar cast ingot is a TC20 titanium alloy cast ingot of three VAR with the diameter of phi 620 mm.
Step two: and recrystallizing, upsetting and forging the columnar ingot to obtain a slab.
Specifically, one-fire forging: taking a columnar ingot blank 1.6T, placing the columnar ingot blank in a box-type resistance furnace, heating to 1150 ℃ (Tbeta=1020 ℃), upsetting, drawing and forging the columnar ingot blank by using a 63MN rapid forging machine (drawing from the other direction after upsetting), repeatedly reversing, upsetting, drawing and forging three times, and forging four edges into a long eight-direction cylinder in an inverted eight-direction manner to obtain a first forging blank;
The first forging stock is sawed into two pieces of 0.8T, the two pieces are placed in a box-type resistance furnace, the box-type resistance furnace is heated to 1080 ℃, a 25MN rapid forging machine is used for carrying out reversing upsetting and drawing forging on the first forging stock (the upsetting needs to be drawn from the other direction), and the reversing upsetting and drawing forging is repeated for three times.
Forging by two fires: placing the first forging stock in a box-type resistance furnace, heating to 1000 ℃, and carrying out reversing upsetting and drawing forging on the first forging stock by using a 25MN quick forging machine to obtain a second forging stock;
three-fire forging: and (3) placing the second forging stock in a box-type resistance furnace, heating to 1040 ℃, and carrying out reversing upsetting and drawing forging on the second forging stock by using a 25MN quick forging machine to obtain a third forging stock.
Forging with four fires: placing the third forging stock in a box-type resistance furnace, heating to 1000 ℃, carrying out reversing upsetting and drawing forging on the third forging stock by using a 25MN rapid forging machine, repeating the reversing upsetting and drawing forging twice, and beating the upsetting and drawing forged third forging stock into a plate shape to obtain a fourth forging stock; the thickness of the fourth forging stock is 210mm.
Forging with five fires: placing the fourth forging stock in a box-type resistance furnace, heating to 985 ℃, performing drawing forging on the fourth forging stock by using a 25MN rapid forging machine, beating the fourth forging stock after drawing forging into a plate shape, and machining blank blanks to obtain the blank; wherein, the thickness of slab is 180mm, and width is 700mm, and length is 1200mm.
Step three: rolling the slab to obtain a semi-finished product.
Specifically, rolling by one fire, namely placing the plate blank into a box-type resistance furnace, heating to 970 ℃, rolling the plate blank into 3600mm with the dimension of 60mm 700mm, and trisecting the plate blank according to the length direction to obtain a first rolled piece;
And (3) rolling by two fires, namely placing the first rolled piece in a box-type resistance furnace, heating to 950 ℃, reversing and rolling the first rolled piece into a rolled piece with the size of 25mm 1200mm 1680mm, and obtaining a second rolled piece, namely a two-phase titanium alloy plate semi-finished product.
Step four: and finishing the semi-finished product to obtain a titanium alloy finished product plate.
Specifically, the semi-finished product is subjected to heat treatment in a heating furnace; wherein the heat treatment process comprises: the semi-finished product is kept at 800 ℃ for 60min, furnace cooled to 720 ℃ for 75min,
Discharging from the furnace, and performing annealing leveling treatment;
and (3) performing air cooling and machining treatment on the semi-finished product to obtain a TC20 titanium alloy large-size plate finished product.
Other technical scheme details and technical effects of the embodiments of the present application can be referred to related descriptions in other embodiments of the present application, and are not repeated here.
The application discloses a processing method of a two-phase titanium alloy large-size plate, which adopts a recrystallization circulation reversing upsetting forging mode and a reversing large-deformation hot rolling combined hot processing technology: the titanium alloy plate is prepared by adopting reversing upsetting forging and large-deformation reversing rolling processing with the alloy phase transition point as a reference and adopting gradual decreasing and increasing cyclic heating. According to the technical scheme provided by the embodiment of the application, the forging blank structure is not uniform due to the forging deformation dead zone is avoided by adopting the recrystallization circulation reversing upsetting forging, and referring to fig. 5-10, the internal structure uniformity of the blank can be optimized, the structure grains are fully crushed, and the nascent alpha equiaxed two-state structure morphology is obtained; the reversing hot rolling with large deformation avoids the problems of transverse and longitudinal structure difference and uneven grain elongation caused by the traditional unidirectional rolling. By the technical scheme of the application, the two-phase titanium alloy structure is fully thinned, the (alpha+beta) equiaxial structure is obtained, and the transverse and longitudinal structures are consistent with the mechanical properties, so that the method is completely suitable for the performance requirements of structural members on alloy plates.
Compared with the prior art, the processing method provided by the embodiment of the application has the following beneficial effects:
1. The invention adopts a recrystallization circulation reversing upsetting mode, namely multi-fire forging with temperature steps above a transformation point step by step, equiaxial forging (for example, two-fire forging) with structure below the transformation point, then carrying out homogenization forging at the temperature above the transformation point, avoiding structure non-uniformity caused by local deformation dead zone formed by the previous forging, optimizing the internal structure uniformity of the blank, and then carrying out step-by-step forging at the temperature below the transformation point; meanwhile, unlike the conventional upsetting and drawing, the invention increases the forging deformation ratio by upsetting and drawing in a reversing manner, improves the forging permeability, fully breaks the structure grains, obtains the binary structure form of the primary alpha equiaxed, and achieves the A1 level of flaw detection.
2. The application solves the problems that the longitudinal alpha grains of the plate are in an elongated state and have no broken spheroidization, and the grain structure is coarse, elongated and uneven, and the application adopts large deformation amount cogging hot rolling (such as one-fire forging) to solve the problems, and then finish rolling the reversing finished product, fully refining the grain size, obtaining uniform equiaxed structure, and basically consistent transverse and longitudinal section structure and mechanical properties, and completely meeting the requirements of engineering structural members on two-phase titanium alloy large-size plates.
The blank with the thickness of 3.150-180 mm can be rolled into a finished product with the thickness of 10-25 mm through two rolling fires, and compared with the traditional three-fire hot rolling mode, one rolling fire is reduced, the production efficiency and the yield are improved, the production cost is reduced, and the method is suitable for commercial popularization and application.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (7)
1. The processing method of the two-phase titanium alloy large-size plate is characterized by comprising the following steps of:
step one: obtaining a two-phase titanium alloy columnar ingot;
Step two: performing recrystallization upsetting forging treatment on the columnar ingot to obtain a plate blank;
step three: rolling the slab to obtain a semi-finished product;
step four: finishing the semi-finished product to obtain a titanium alloy finished product plate;
wherein, recrystallization upsetting forging treatment includes:
Forging by fire: heating the columnar ingot to T β +120-150 ℃, and upsetting, drawing and forging the columnar ingot to obtain a first forging stock; after a first forging stock is obtained, sawing and cutting the first forging stock into two parts with equal weight, heating to T β +50-100 ℃, and upsetting, drawing and forging the first forging stock;
Forging by two fires: heating the first forging stock to T β -10-30 ℃, upsetting, drawing and forging the first forging stock to obtain a second forging stock;
Three-fire forging: placing the second forging stock in a condition of heating to T β +10-30 ℃, and upsetting, drawing and forging the second forging stock to obtain a third forging stock;
Forging with four fires: heating the third forging stock to T β -10-30 ℃, carrying out reversing upsetting and drawing forging on the third forging stock, repeating the reversing upsetting and drawing forging twice, and beating the upsetting and drawing forged third forging stock into a plate shape to obtain a fourth forging stock;
Forging with five fires: and heating the fourth forging stock to T β -30-50 ℃, performing drawing forging on the fourth forging stock, and beating the fourth forging stock after drawing forging into a plate shape to obtain the slab.
2. The method for processing a two-phase titanium alloy large-size plate according to claim 1, wherein the thickness of the plate blank is 150-180 mm, the width is 700-800 mm, and the length is 1000-1200 mm.
3. The method for processing a two-phase titanium alloy large-size sheet material according to claim 1, wherein the upsetting-drawing forging of the columnar ingot comprises:
and repeatedly reversing, upsetting, drawing and forging the columnar cast ingot, and performing four-edge reverse octagon treatment to obtain the first forging stock with the shape of an octagon cylinder.
4. The method for processing a two-phase titanium alloy large-size sheet material according to claim 1, wherein the third step comprises:
Rolling by fire: heating the slab to T β -50-60 ℃, rolling the slab, and trisecting the slab in the length direction to obtain a first rolled piece;
And (3) rolling by two fires: and heating the first rolling piece to T β -70-80 ℃, and reversing and rolling the first rolling piece to obtain the semi-finished product.
5. The method for processing a two-phase titanium alloy large-size plate according to claim 4, wherein the semi-finished product has a thickness ranging from 10 mm to 25mm, a width ranging from 1000 mm to 1200mm and a length ranging from 1500 mm to 3000mm.
6. The method for processing a two-phase titanium alloy large-size sheet according to claim 1, wherein the fourth step comprises:
performing heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment comprises: preserving heat at 800-820 ℃ for 30-75min, cooling to 700-720 ℃ and preserving heat for 60-90min;
Discharging from the furnace, and performing annealing leveling treatment;
And carrying out air cooling and machining treatment on the semi-finished product to obtain the titanium alloy finished product plate.
7. The method for processing a two-phase titanium alloy large-size plate according to claim 1, wherein the columnar ingot is a three-time VAR titanium alloy ingot with a diameter of phi 620-phi 720 mm.
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| CN115921740A (en) * | 2022-12-26 | 2023-04-07 | 西北工业大学 | Method for Improving Microstructure Uniformity of Bars and Method for Improving Microstructure Uniformity of Forgings |
| CN116833351A (en) * | 2023-07-28 | 2023-10-03 | 宝鸡荣炜康钛金属材料有限公司 | A method for preparing high-performance titanium alloy plates |
| CN117107176A (en) * | 2023-08-28 | 2023-11-24 | 西安圣泰金属材料有限公司 | Preparation method of superfine crystal titanium alloy bar |
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