CN114406169A - 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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- CN114406169A CN114406169A CN202210039240.7A CN202210039240A CN114406169A CN 114406169 A CN114406169 A CN 114406169A CN 202210039240 A CN202210039240 A CN 202210039240A CN 114406169 A CN114406169 A CN 114406169A
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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
Abstract
The invention discloses a processing method of a two-phase titanium alloy large-size plate, which adopts a combined hot processing technology of a recrystallization circulating reversing upsetting-drawing forging mode and reversing large-deformation hot rolling, and comprises the following steps: the titanium alloy plate is prepared by adopting reversing upsetting forging and large-deformation reversing rolling processing of gradual and gradual increase and gradual increase cyclic heating based on the alloy phase change point. The method adopts recrystallization circulation reversing upsetting forging to avoid uneven forging blank structure caused by forging deformation dead zones, optimizes the internal structure uniformity of the blank, fully crushes the structure grains and obtains a primary alpha equiaxial two-state structure form; by the reversing hot rolling with large deformation, the problems of transverse and longitudinal structure difference and uneven grain elongation caused by the traditional unidirectional rolling are avoided. According to the technical scheme, the two-phase titanium alloy structure is fully refined, the (alpha + beta) equiaxial structure is obtained, the transverse and longitudinal structures are consistent with the mechanical property, and the titanium alloy structure is completely suitable for the performance requirements of the structural part on the alloy plate.
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 to the fields of aerospace and ocean engineering.
At present, the titanium alloy is widely applied to the fields of aviation large airplanes and ocean engineering, is a two-phase titanium alloy large-size plate, is used for manufacturing a large-size bearing structural member, and has extremely high requirements on the performance and the safety and the reliability of the titanium alloy material, so that high-level requirements are put forward on the manufacturing process and the performance of the material.
In general, the large-size plate is more than 10mm in thickness, more than 1000mm in length and width, and more than 50kg in monomer weight, so that for the material processing and forming process, the size is ensured, and more importantly, the internal structure and comprehensive mechanical properties of the material are ensured.
The two-phase titanium alloy consists of two phases (alpha + beta), 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 for large-size titanium alloy plates, how to obtain the uniformity of the whole structure and the isotropy of the plates in the processing process is a technical difficulty.
Disclosure of Invention
Based on the above problems, the present application provides a method for processing a two-phase titanium alloy large-size plate, which can obtain the uniformity of the overall structure and the isotropy of the plate by recrystallization forging.
The processing method of the two-phase titanium alloy large-size plate is realized by the following technical scheme:
a processing method of a two-phase titanium alloy large-size plate comprises the following steps:
the method comprises the following steps: obtaining a two-phase titanium alloy columnar ingot;
step two: performing recrystallization upsetting-drawing forging treatment on the columnar cast ingot to obtain a plate blank;
step three: rolling the plate blank to obtain a semi-finished product;
step four: finely processing the semi-finished product to obtain a titanium alloy finished plate;
wherein the recrystallization upsetting-drawing forging process comprises:
first-stage forging: heating the columnar ingot to Tbeta + 120-150 ℃, and carrying out upsetting, drawing and forging on the columnar ingot to obtain a first forging blank;
forging with two heats: heating the first forging stock to T beta-10-30 ℃, and carrying out upsetting, drawing and forging on the first forging stock to obtain a second forging stock;
forging with three heats: heating the second forging stock to T beta + 10-30 ℃, and carrying out upsetting, drawing and forging on the second forging stock to obtain a third forging stock;
and obtaining the plate blank according to the third forging stock.
In one possible implementation, the one-shot forging further includes:
heating the columnar ingot to Tbeta + 120-150 ℃, upsetting, drawing and forging the columnar ingot to obtain a first forging stock, sawing the first forging stock into two equal-weight pieces, heating to Tbeta + 50-100 ℃, and upsetting, drawing and forging the first forging stock.
In a possible implementation, said obtaining said slab from said third forging stock comprises:
four-fire forging: heating the third forging stock to T beta-10-30 ℃, performing reversing upsetting stretching forging on the third forging stock, repeating reversing upsetting stretching forging twice, and beating the third forging stock subjected to upsetting stretching forging into a plate shape to obtain a fourth forging stock;
forging with five heats: and heating the fourth forging stock to the temperature of Tbeta-30-50 ℃, drawing and forging the fourth forging stock, and beating the drawn and forged fourth forging stock into a plate shape to obtain the plate blank.
In a possible implementation mode, the thickness of the plate blank is 150-180 mm, the width is 700-800 mm, and the length is 1000-1200 mm.
In one possible implementation, the upsetting and drawing forging the columnar ingot comprises:
and repeatedly reversing, upsetting, drawing and forging the columnar cast ingot, and performing four-edge and eight-direction reversing treatment to obtain the first forging stock in the shape of a long eight-direction column.
In a possible implementation manner, the rolling is reverse rolling, and the step three includes:
rolling the plate blank by one fire, heating the plate blank to the temperature of Tbeta-50-60 ℃, rolling the plate blank, and trisecting the plate blank according to the length direction to obtain a first rolled piece;
and (2) carrying out second-fire rolling, heating the first rolled piece to the temperature of T beta-70-80 ℃, and reversing the first rolled piece of the plate to roll to obtain the semi-finished product.
In one possible implementation manner, the fourth step includes:
carrying out heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment comprises: preserving heat for 30-75min at 800-820 ℃, cooling the furnace to 700-720 ℃, and preserving heat for 60-90 min;
discharging, and carrying out annealing leveling treatment;
and air cooling and machining the semi-finished product to obtain the titanium alloy finished plate.
In a possible implementation mode, the columnar ingot is a cubic VAR titanium alloy ingot with the phi 620-phi 720 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-drawing mode, namely: multi-fire forging with temperature steps step by step above the phase transformation point, equiaxial forging of a structure below the phase transformation point, and carrying out homogenization forging at a temperature above the phase transformation point, so that the structure nonuniformity caused by a local deformation dead zone formed by the previous forging is avoided, the internal structure uniformity of the blank is optimized, and the temperature below the phase transformation point is forged step by step; meanwhile, different from the conventional upsetting and drawing, the upsetting and drawing in a reversing mode are adopted, the forging deformation ratio is increased, the forging permeability is improved, the tissue grains are fully crushed, the two-state tissue morphology with the same axial dimension as primary alpha is obtained, and the flaw detection reaches A1 level.
2. In order to solve the problems that longitudinal alpha grains of the plate are in an elongated state and are not crushed and spheroidized due to the traditional unidirectional rolling, the crystal grain structure is thick, elongated and uneven, the method adopts cogging and hot rolling with large deformation amount, then reversing finish rolling of a finished product is carried out, the grain size is fully refined, a uniform equiaxial structure is obtained, the transverse and longitudinal section structure and the mechanical property are basically consistent, and the method is completely suitable for the requirements of an engineering structural member on a two-phase titanium alloy large-size plate.
3.150-180 mm thick plate blank can be rolled to 10-25mm thick finished product through two rolling times, needs three hot rolling modes than the tradition, has reduced a rolling number of times, improves production efficiency and yield, has reduced manufacturing cost, is applicable to 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 first flowchart of a method for processing a two-phase titanium alloy large-size plate 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 representation of a recrystallization reverse upset forging deformation;
FIG. 4 is a schematic representation of recrystallization reversal upset-draw forging heating temperatures;
FIG. 5 is a metallographic structure diagram providing a cross section (b) and a longitudinal section of a conventional forged titanium alloy slab (a);
FIG. 6 is a metallographic structure diagram of a cross section (a) and a longitudinal section (b) of a titanium alloy plate after conventional rolling;
FIG. 7 is a metallographic structure of a longitudinal section of a cross section (b) of a titanium alloy slab after recrystallization cycle reverse heading forging according to an embodiment of the present invention;
FIG. 8 is a metallographic structure diagram of different positions of a cross section of a titanium alloy slab subjected to recrystallization cycle reverse upsetting forging according to an embodiment of the invention;
FIG. 9 is a metallographic structure diagram of a cross section (b) and a longitudinal section of a titanium alloy plate after reversing rolling (a) provided by an embodiment of the invention;
FIG. 10 is a graph showing the comparison of the properties of titanium alloy sheets produced in a conventional manner and in accordance with the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example one
The embodiment of the present application provides a method for processing a two-phase titanium alloy large-size plate, as shown in fig. 1 and 2, the method may include the following steps:
and S110, obtaining a two-phase titanium alloy columnar ingot.
And S111, recrystallizing, upsetting and forging the columnar cast ingot to obtain a slab.
And S112, rolling the plate blank to obtain a semi-finished product.
And S113, finishing the semi-finished product to obtain a titanium alloy finished plate.
Wherein, the recrystallization upsetting forging the columnar ingot to obtain the slab comprises the following steps:
first-stage forging: heating the columnar ingot to Tbeta + 120-150 ℃, and carrying out upsetting, drawing and forging on the columnar ingot to obtain a first forging blank;
forging with two heats: heating the first forging stock to T beta-10-30 ℃, and carrying out upsetting, drawing and forging on the first forging stock to obtain a second forging stock;
forging with three heats: heating the second forging stock to T beta + 10-30 ℃, and carrying out upsetting, drawing and forging on the second forging stock to obtain a third forging stock; and obtaining the plate blank according to the third forging stock.
In the embodiment of the present application, as an alternative implementation, as shown in fig. 2, the step of one-shot forging may further include:
heating the columnar ingot to Tbeta + 120-150 ℃, upsetting, drawing and forging the columnar ingot to obtain a first forging stock, sawing the first forging stock into two equal-weight pieces, heating to Tbeta + 50-100 ℃, and upsetting, drawing and forging the first forging stock.
In one example, after the first forging stock is obtained as described above, the first forging stock may be sawn into pieces of equal weight.
In the embodiments of the present application, the above-described recrystallization-upsetting forging and slab rolling processes may be performed in a box-type electric resistance furnace, as an example.
In one example, a hot forging may employ a 63MN rapid forging machine to upset, draw and forge the columnar ingot; the second-fire forging can be implemented by using a 25MN quick forging machine to perform reversing upsetting and drawing-out forging on the first forging stock.
In the embodiment of the present application, as an optional implementation manner, after the three-fire forging, the method may further include:
four-fire forging: and heating the third forging stock to the temperature of Tbeta-10-30 ℃, performing reversing upsetting stretching forging on the third forging stock, repeating the reversing upsetting stretching forging twice, and beating the third forging stock subjected to upsetting stretching forging into a plate shape to obtain a fourth forging stock.
Forging with five heats: and heating the fourth forging stock to the temperature of Tbeta-30-50 ℃, drawing and forging the fourth forging stock, and beating the drawn and forged fourth forging stock into a plate shape to obtain a plate blank.
The above-mentioned manner of performing reverse upsetting long forging on each forging stock is shown in fig. 3, which is a schematic diagram of recrystallization reverse upsetting forging deformation.
It should be noted that the steps of four-fire forging and 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 above-mentioned one-fire forging are those at stages 1 and 2 in fig. 4, the temperatures corresponding to the above-mentioned two-fire forging are those at stage 3 in fig. 4, the temperatures corresponding to the above-mentioned three-fire forging are those at stage 4 in fig. 4, and the temperatures corresponding to the above-mentioned four-fire forging and five-fire forging are those at stages 5 and 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 the embodiment of the present application, as an alternative implementation manner, the upsetting elongation processing in the one-shot forging process may adopt a reverse upsetting elongation manner.
In one example, said upsetting elongation forging of said columnar ingot comprises: and repeatedly reversing, upsetting, drawing and forging the columnar ingot blank, and performing four-edge and eight-direction reversing treatment to obtain the first forging blank in the shape of a long eight-direction column.
In an example, the rolling is reverse rolling, and the third step may include:
rolling the plate blank by one fire, heating the plate blank to the temperature of Tbeta-50-60 ℃, rolling the plate blank, and trisecting the plate blank according to the length direction to obtain a first rolled piece;
and (2) carrying out second-fire rolling, heating the first rolled piece to the temperature of T beta-70-80 ℃, and reversing the first rolled piece of the plate to roll to obtain the semi-finished product.
In one example, the fourth step may include: carrying out heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment comprises: preserving heat for 30-75min at 800-820 ℃, cooling the furnace to 700-720 ℃, and preserving heat for 60-90 min;
discharging, and carrying out annealing leveling treatment;
and air cooling and machining the semi-finished product to obtain the titanium alloy finished plate.
In the embodiment of the present application, as an example, the columnar ingot may be a cubic VAR titanium alloy ingot of (Φ 620 — Φ 720) mm.
Example two
The method provided by the embodiments of the present application is described in detail below by using specific examples.
In practical applications, the method provided by the embodiment of the present application can also be implemented by using the following steps.
Step one, obtaining a columnar ingot.
In the embodiment of the application, as an example, the columnar ingot can be a TC4 titanium alloy ingot of phi 720mm cubic VAR.
And step two, carrying out recrystallization, upsetting and forging on the columnar cast ingot to obtain a slab.
In an embodiment of the present application, the recrystallization upset forging may include:
first-stage forging: taking a columnar ingot blank 1.5T, placing the columnar ingot blank in a box type resistance furnace, heating to 1139 ℃ (T beta is 983 ℃), using a 63MN quick forging machine to carry out upsetting and drawing forging on the columnar ingot blank (the columnar ingot blank needs to be drawn out from the other direction after upsetting), repeating reversing upsetting and drawing forging for three times, and carrying out four-edge inverted eight-square forging to form an eight-square column body to obtain a first forging blank; the first forging stock is divided into two pieces of 0.75T by sawing, the two pieces are placed in a box-type resistance furnace, the heating is carried out to 1060 ℃, a 25MN quick forging machine is used for carrying out reversing upsetting stretching forging on the first forging stock (stretching from the other direction after upsetting), and the reversing upsetting stretching forging is repeated for three times.
Forging with two heats: and (3) placing the first forging stock in a box-type resistance furnace, heating to 965 ℃, and performing reversing upsetting, drawing and forging on the first forging stock by using a 25MN quick forging machine to obtain a second forging stock.
Forging with three heats: and (3) placing the second forging stock in a box-type resistance furnace, heating to 1000 ℃, and performing reversing upsetting, drawing and forging on the second forging stock by using a 25MN quick forging machine to obtain a third forging stock.
Four-fire forging: placing the third forging stock in a box-type resistance furnace, heating to 960 ℃, performing reversing upsetting stretching forging on the third forging stock by using a 25MN quick forging machine, repeating the reversing upsetting stretching forging twice, and beating the third forging stock subjected to upsetting stretching forging into a plate shape to obtain a fourth forging stock; the thickness of the fourth forging stock is 210 mm.
Forging with five heats: placing the fourth forging stock in a box-type resistance furnace, heating to 950 ℃, using a 25MN quick forging machine to perform drawing forging on the fourth forging stock, beating the drawn and forged fourth forging stock into a plate shape, and mechanically adding a blank to obtain a plate blank; wherein the thickness of the plate blank is 150mm, the width is 800mm, and the length is 1200 mm.
And step three, rolling the plate blank to obtain a semi-finished product.
In the embodiment of the present application, step three may include:
rolling in one fire: placing the plate blank in a box-type resistance furnace, heating to 930 ℃, rolling the plate blank into the size of 50mm x 800mm x 3600mm, and trisecting according to the length direction to obtain a first rolled piece;
and (3) rolling with two heats: and (3) placing the first rolled piece in a box-type resistance furnace, heating to 910 ℃, and reversely rolling the first rolled piece into a second rolled piece, namely a two-phase titanium alloy plate semi-finished product, wherein the size of the second rolled piece is 15mm x 1200mm x 2667 mm.
And step four, finely machining the semi-finished product to obtain a titanium alloy finished plate.
In the embodiment of the present application, as an example, the finishing process may include:
carrying out heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment process comprises: keeping the temperature of the semi-finished product at 820 ℃ for 45min, cooling the semi-finished product to 720 ℃ in a furnace, keeping the temperature for 60min, discharging the semi-finished product out of the furnace, and carrying out annealing leveling treatment;
and air cooling and machining the semi-finished product to obtain a finished product of the TC4 titanium alloy large-size plate.
For details and technical effects of other technical solutions in the embodiments of the present application, reference may be made to relevant descriptions in other embodiments of the present application, which are not described herein again.
EXAMPLE III
The embodiment of the application also provides an optional implementation mode of the method. This embodiment comprises the steps of:
step one, obtaining a columnar ingot.
In the embodiment of the application, the columnar ingot can be a TC11 titanium alloy ingot with phi 650mm cubic VAR as an example.
And step two, performing recrystallization, circulating upsetting-drawing and forging the columnar cast ingot to obtain a plate blank.
In this embodiment of the present application, the second step may include:
first-stage forging: taking 1.4T of columnar ingot blank, placing the columnar ingot blank in a box-type resistance furnace, and heating to 1170 ℃ (Tbeta)
At 1033 ℃, upsetting and drawing out the columnar ingot blank by using a 63MN quick forging machine (the columnar ingot blank needs to be drawn out from the other direction after upsetting), repeatedly reversing, upsetting and drawing out for three times, and forging the columnar ingot blank into a rectangular octagonal column in a four-edge inverted octagonal manner to obtain a first forging blank; sawing the first forging stock into two pieces of 0.7T, placing the two pieces of 0.7T in a box-type resistance furnace, heating to 1100 ℃, using a 25MN quick forging machine to perform reversing upsetting stretching forging on the first forging stock (stretching from the other direction after upsetting), and repeating the reversing upsetting stretching forging for three times.
Forging with two heats: and (3) placing the first forging stock in a box-type resistance furnace, heating to 1015 ℃, and performing reversing upsetting, drawing and forging on the first forging stock by using a 25MN quick forging machine to obtain a second forging stock.
Forging with three heats: and (3) placing the second forging stock in a box-type resistance furnace, heating to 1050 ℃, and performing reversing upsetting, drawing and forging on the second forging stock by using a 25MN quick forging machine to obtain a third forging stock.
Four-fire forging: placing the third forging stock in a box-type resistance furnace, heating to 1015 ℃, performing reversing upsetting stretching forging on the third forging stock by using a 25MN quick forging machine, repeating the reversing upsetting stretching forging twice, and beating the third forging stock subjected to upsetting stretching forging into a plate shape to obtain a fourth forging stock; the thickness of the fourth forging stock is 210 mm.
Forging with five heats: placing the fourth forging stock in a box-type resistance furnace, heating to 990 ℃, using a 25MN quick forging machine to perform drawing forging on the fourth forging stock, beating the drawn and forged fourth forging stock into a plate shape, and mechanically adding a blank to obtain a plate blank; wherein, the thickness of slab is 160mm, and the width is 750mm, and length is 1120 mm.
And step three, rolling the plate blank to obtain a semi-finished product.
In an embodiment of the present application, the step three may include:
rolling in one fire: placing the plate blank in a box-type resistance furnace, heating to 975 ℃, rolling the plate blank into a size of 52mm by 750mm by 3446mm, and quartering according to the length direction to obtain a first rolled piece;
and (3) rolling with two heats: and (3) placing the first rolled piece in a box type resistance furnace, heating to 960 ℃, and reversely rolling the first rolled piece into a second rolled piece, namely a two-phase titanium alloy plate semi-finished product, wherein the size of the first rolled piece is 18mm 1149mm 2167 mm.
And step four, finely machining the semi-finished product to obtain a titanium alloy finished plate.
In this embodiment of the present application, the step four may include:
carrying out heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment process comprises: the semi-finished product is insulated for 50min at 800 ℃, furnace cooling is carried out to 700 ℃ and insulated for 90min,
discharging, and carrying out annealing leveling treatment;
and air cooling and machining the semi-finished product to obtain a finished product of the TC11 titanium alloy large-size plate.
For details and technical effects of other technical solutions in the embodiments of the present application, reference may be made to relevant descriptions in other embodiments of the present application, which are not described herein again.
Example four
The embodiment of the application also provides another optional implementation mode of the method. This embodiment comprises the steps of:
step one, obtaining a columnar ingot;
specifically, the columnar ingot is a TC20 titanium alloy ingot of phi 620mm three-time VAR.
Step two: and performing repeated recrystallization upsetting-drawing forging on the columnar cast ingot to obtain a plate blank.
Specifically, the first-stage forging: taking a columnar ingot blank 1.6T, placing the columnar ingot blank in a box-type resistance furnace, heating to 1150 ℃ (T beta is 1020 ℃), using a 63MN quick forging machine to carry out upsetting and drawing forging on the columnar ingot blank (the columnar ingot blank needs to be drawn out from the other direction after upsetting), repeating reversing upsetting and drawing forging for three times, and carrying out four-edge and eight-direction forging to obtain a long eight-direction cylinder to obtain a first forging blank;
sawing the first forging stock into two pieces of 0.8T, placing the two pieces of 0.8T in a box-type resistance furnace, heating to 1080 ℃, using a 25MN quick forging machine to perform reversing upsetting stretching forging on the first forging stock (stretching from the other direction after upsetting), and repeating the reversing upsetting stretching forging for three times.
Forging with two heats: placing the first forging stock in a box-type resistance furnace, heating to 1000 ℃, and performing reversing upsetting, drawing and forging on the first forging stock by using a 25MN quick forging machine to obtain a second forging stock;
forging with three heats: and (3) placing the second forging stock in a box-type resistance furnace, heating to 1040 ℃, and performing reversing upsetting, drawing and forging on the second forging stock by using a 25MN quick forging machine to obtain a third forging stock.
Four-fire forging: placing the third forging stock in a box-type resistance furnace, heating to 1000 ℃, performing reversing upsetting stretching forging on the third forging stock by using a 25MN quick forging machine, repeating the reversing upsetting stretching forging twice, and beating the third forging stock subjected to upsetting stretching forging into a plate shape to obtain a fourth forging stock; the thickness of the fourth forging stock is 210 mm.
Forging with five heats: placing the fourth forging stock in a box-type resistance furnace, heating to 985 ℃, using a 25MN quick forging machine to perform drawing forging on the fourth forging stock, beating the drawn and forged fourth forging stock into a plate shape, and mechanically adding a blank to obtain a plate blank; the thickness of the plate blank is 180mm, the width of the plate blank is 700mm, and the length of the plate blank is 1200 mm.
Step three: and rolling the plate blank to obtain a semi-finished product.
Specifically, the plate blank is rolled in one fire, the plate blank is placed in a box type resistance furnace, the heating is carried out to 970 ℃, the plate blank is rolled into the size of 60mm x 700mm x 3600mm, and trisection is carried out according to the length direction, so that a first rolled piece is obtained;
and (2) rolling by using two fire, namely placing the first rolled piece in a box-type resistance furnace, heating to 950 ℃, and reversely rolling the first rolled piece into the plate with the size of 25mm x 1200mm x 1680mm to obtain a second rolled piece, namely the two-phase titanium alloy plate semi-finished product.
Step four: and finely processing the semi-finished product to obtain a titanium alloy finished 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 insulated for 60min at 800 ℃, furnace cooling is carried out to 720 ℃ and insulated for 75min,
discharging, and carrying out annealing leveling treatment;
and air cooling and machining the semi-finished product to obtain a finished product of the TC20 titanium alloy large-size plate.
For details and technical effects of other technical solutions in the embodiments of the present application, reference may be made to relevant descriptions in other embodiments of the present application, which are not described herein again.
The invention discloses a processing method of a two-phase titanium alloy large-size plate, which adopts a combined hot processing technology of a recrystallization circulating reversing upsetting-drawing forging mode and reversing large-deformation hot rolling, and comprises the following steps: the titanium alloy plate is prepared by adopting reversing upsetting forging and large-deformation reversing rolling processing of gradual and gradual increase and gradual increase cyclic heating based on the alloy phase change point. According to the invention, recrystallization circulation reversing upsetting forging is adopted to avoid uneven forging blank structure caused by forging deformation dead zones, and referring to fig. 5-10, the technical scheme of the embodiment of the invention can optimize the internal structure uniformity of the blank, fully crush the structure grains and obtain a two-state structure form such as primary alpha equiaxial; by the reversing hot rolling with large deformation, the problems of transverse and longitudinal structure difference and uneven grain elongation caused by the traditional unidirectional rolling are avoided. According to the technical scheme, the two-phase titanium alloy structure is fully refined, the (alpha + beta) equiaxial structure is obtained, the transverse and longitudinal structures are consistent with the mechanical property, and the titanium alloy structure is completely suitable for the performance requirements of the structural part on the alloy plate.
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 step-by-step temperature steps above the phase transformation point, equiaxial forging (such as two-fire forging) of a structure below the phase transformation point, and carrying out uniform forging at the temperature above the phase transformation point, so that the tissue nonuniformity caused by a local deformation dead zone formed by the previous forging is avoided, the internal tissue uniformity of the blank is optimized, and the step-by-step forging is carried out at the temperature below the phase transformation point; meanwhile, different from the conventional upsetting and drawing, the upsetting and drawing in a reversing mode are adopted, the forging deformation ratio is increased, the forging permeability is improved, the tissue grains are fully crushed, the two-state tissue morphology with the same axial dimension as primary alpha is obtained, and the flaw detection reaches A1 level.
2. The problem that longitudinal alpha grains of a plate are in an elongated state and are not crushed and spheroidized due to the fact that traditional unidirectional rolling causes thick elongation and non-uniformity of a grain structure can be solved, and according to the problem, cogging and hot rolling (such as one-shot forging) with large deformation amount are adopted, then reversing finish rolling is carried out on a finished product, the grain size is fully refined, uniform equiaxial structures are obtained, the transverse and longitudinal section structures and the mechanical property are basically consistent, and the method is completely suitable for the requirements of engineering structural members on two-phase titanium alloy large-size plates.
3.150-180 mm thick plate blank can be rolled to 10-25mm thick finished product through two rolling times, needs three hot rolling modes than the tradition, has reduced a rolling number of times, improves production efficiency and yield, has reduced manufacturing cost, is applicable to commercial popularization and application.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A processing method of a two-phase titanium alloy large-size plate is characterized by comprising the following steps:
the method comprises the following steps: obtaining a two-phase titanium alloy columnar ingot;
step two: performing recrystallization upsetting-drawing forging treatment on the columnar cast ingot to obtain a plate blank;
step three: rolling the plate blank to obtain a semi-finished product;
step four: finely processing the semi-finished product to obtain a titanium alloy finished plate;
wherein the recrystallization upsetting-drawing forging process comprises:
first-stage forging: heating the columnar ingot to TβCarrying out upsetting, drawing and forging on the columnar cast ingot at + 120-150 ℃ to obtain a first forging blank;
forging with two heats: heating the first forging stock to TβCarrying out upsetting, drawing and forging on the first forging stock at the temperature of-10-30 ℃ to obtain a second forging stock;
forging with three heats: placing the second forging stock in a heating to TβCarrying out upsetting, drawing and forging on the second forging stock at + 10-30 ℃ to obtain a third forging stock;
and obtaining the plate blank according to the third forging stock.
2. The method of processing a two-phase titanium alloy sheet according to claim 1, wherein said one-shot forging further comprises:
heating the columnar ingot 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 equal-weight pieces, and heating to TβAnd + 50-100 ℃, carrying out upsetting, drawing and forging on the first forging stock.
3. The method for processing two-phase titanium alloy large-size plates according to claim 1, wherein the slab is obtained from the third forging stock and comprises the following steps:
four-fire forging: heating the third forging stock to TβReversing upsetting stretching forging is carried out on the third forging stock at the temperature of-10-30 ℃, reversing upsetting stretching forging is repeated twice, and the third forging stock after upsetting stretching forging is patted into a plate shape to obtain a fourth forging stock;
forging with five heats: heating the fourth forging stock to TβAnd (3) carrying out drawing forging on the fourth forging stock at the temperature of-30-50 ℃, and beating the drawn and forged fourth forging stock into a plate shape to obtain the plate blank.
4. A processing method of a two-phase titanium alloy large-size plate according to claim 3, wherein the thickness of the plate blank is 150-180 mm, the width is 700-800 mm, and the length is 1000-1200 mm.
5. The processing method of the two-phase titanium alloy large-size plate as claimed in claim 1, wherein the upsetting and drawing forging of the columnar ingot comprises the following steps:
and repeatedly reversing, upsetting, drawing and forging the columnar cast ingot, and performing four-edge and eight-direction reversing treatment to obtain the first forging stock in the shape of a long eight-direction column.
6. A method for processing a two-phase titanium alloy large-size plate according to claim 1, wherein the third step comprises:
rolling in one fire: heating the slab to TβRolling the plate blank at the temperature of 50-60 ℃, and trisecting the plate blank according to the length direction to obtain a first rolled piece;
and (3) rolling with two heats: heating the first rolled piece to TβAnd reversing and rolling the first rolled piece at the temperature of between 70 and 80 ℃ to obtain the semi-finished product.
7. The method as claimed in claim 6, wherein the thickness of the semi-finished product is 10-25mm, the width is 1000-1200mm, and the length is 1500-3000 mm.
8. A method for processing a two-phase titanium alloy large-size plate according to claim 1, wherein the fourth step comprises:
carrying out heat treatment on the semi-finished product in a heating furnace; wherein the heat treatment comprises: preserving heat for 30-75min at 800-820 ℃, cooling the furnace to 700-720 ℃, and preserving heat for 60-90 min;
discharging, and carrying out annealing leveling treatment;
and air cooling and machining the semi-finished product to obtain the titanium alloy finished plate.
9. The method for processing the two-phase titanium alloy large-size plate according to claim 1, wherein the columnar ingot is a cubic VAR titanium alloy ingot with the diameter of phi 620-phi 720 mm.
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