CN108326516B - Preparation method of titanium steel composite board - Google Patents
Preparation method of titanium steel composite board Download PDFInfo
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- CN108326516B CN108326516B CN201810104517.3A CN201810104517A CN108326516B CN 108326516 B CN108326516 B CN 108326516B CN 201810104517 A CN201810104517 A CN 201810104517A CN 108326516 B CN108326516 B CN 108326516B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0033—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—Welding
- B23K15/008—Spot welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—Welding
- B23K15/0093—Welding characterised by the properties of the materials to be welded
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/06—Electron-beam welding or cutting within a vacuum chamber
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
Abstract
The invention discloses a preparation method of a titanium steel composite board, which prepares the titanium steel composite board with high bonding performance through the procedures of blank preparation, surface treatment, separant coating, symmetrical assembly, electron beam sealing and welding, heating, rolling, straightening, cutting and board splitting and the like. The lamination is added on the interface to be compounded of titanium and steel in the assembly process, so that the titanium and the steel in the composite blank can not be fully contacted, the mutual diffusion of elements in the heating process is prevented, the generation of brittle phases such as interface carbide and intermetallic compounds is controlled, then an interface oxide film is damaged through rolling with large reduction, the formation and the full metallurgical bonding of a new bonding interface of the titanium and the steel are realized, the rapid cooling is carried out after the rolling, the re-formation of the brittle phases is inhibited, and the titanium and steel composite plate with high bonding performance and no brittle phases is prepared. Compared with the method of adding the nickel foil or the copper foil in the middle layer, the method has the advantages of simpler operation, lower production cost and high bonding performance.
Description
Technical Field
The invention belongs to the technical field of bimetal composite manufacturing, relates to preparation of composite plates, and particularly relates to a preparation method of a titanium steel composite plate.
Background
Titanium has remarkably excellent corrosion resistance, and the corrosion resistance of titanium exceeds that of stainless steel in most corrosion environments, so that the titanium is widely applied to the fields of chemical devices, pressure vessels, heat exchangers, offshore operation platforms, aerospace and the like. However, titanium is expensive, which increases the material cost for manufacturing the device, which limits the use of titanium. The titanium steel composite plate has excellent corrosion resistance of titanium and toughness of steel, greatly reduces the use amount of titanium, saves cost, and has high economic value and good application prospect.
At present, the main preparation methods of the titanium steel composite plate comprise an explosion cladding method, an explosion-rolling cladding method and a vacuum rolling cladding method. The explosion cladding method has the disadvantages of noise pollution and environmental pollution, is greatly influenced by weather, has low production efficiency, and is not a green, environment-friendly and sustainable production mode. The vacuum rolling composite method is a production process for realizing good metallurgical bonding of the base material and the clad material by vacuum welding assembly and heating and rolling, has higher production efficiency, low pollution and low energy consumption, and can produce metal composite plates with wide specifications. Therefore, the titanium steel composite plate produced by adopting the vacuum rolling composite method is a future development trend.
However, when the titanium steel composite plate is prepared by the vacuum rolling method, because titanium and steel have severe interface reaction at high temperature, if titanium and steel are directly rolled and compounded, brittle phases such as Ti-Fe intermetallic compounds and TiC are easily produced on the compound interface, and the bonding performance of the titanium steel composite plate is greatly influenced. In order to suppress the formation of an interface brittle phase, an intermediate layer such as a nickel foil or a copper foil is usually added between titanium and steel to prevent the bonding of Ti and C or Ti and Fe, thereby enhancing the bonding strength of the titanium-steel composite interface. For example, in patent publication 201510249152.X "high-temperature preparation method of titanium steel composite plate using nickel as intermediate layer" and 201510247275.X "preparation method of titanium steel composite plate with high bonding strength" nickel foil is added as intermediate layer to roll titanium steel composite plate so as to obtain titanium steel composite plate with good bonding property. However, the addition of the intermediate layer not only complicates the production process, but also increases the production cost. Therefore, it is necessary to find a suitable production process for preparing titanium steel composite plates with high bonding performance.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a preparation method of a titanium steel composite plate, aiming at solving the problem that the bonding performance of the composite plate is influenced by serious interface reaction generated when the titanium steel composite plate is prepared by adopting a vacuum rolling method.
The technical scheme is as follows: the invention relates to a preparation method of a titanium steel composite plate, which comprises the following steps:
(1) carrying out surface treatment on the surfaces to be compounded of the base material and the cover material blank;
(2) coating a release agent on the non-composite surface of the clad material obtained in the step (1), and drying;
(3) selecting a base material obtained in the step (1) as a lower blank, fixing the periphery of the surface to be compounded of the lower blank by using seal bars in a spot welding manner to form a groove in a surrounding manner, fixing a plurality of lamination sheets on the surface to be compounded of the lower blank in the groove in a spot welding manner, then superposing the non-compounded surfaces of the two cladding materials obtained in the step (2) in a groove, using the other base material obtained in the step (1) as an upper blank, fixing a plurality of lamination sheets on the surface to be compounded of the upper blank in a spot welding manner, covering the surface to be compounded of the upper blank on the two cladding materials downwards, and ensuring that the outer edges of the periphery of the upper blank and the periphery of the lower blank are parallel and level with the outer edge of the seal bar to form a;
(4) welding the symmetrical combined blank obtained in the step (3) in a vacuum environment;
(5) heating the symmetrical combined blank obtained in the step (4);
(6) carrying out hot rolling and cooling on the symmetrical combined blank obtained in the step (5);
(7) and (4) straightening, cooling and cutting the symmetrical combined blank obtained in the step (6) to separate the blank into plates, so as to obtain the titanium steel composite plate.
In the step (1), the base material is carbon steel or low-alloy high-strength steel, the clad material is industrial pure titanium, such as TA1 and TA2, and the components and the performance of the clad material meet the requirements of corresponding standards; the surface treatment method is abrasive belt grinding or milling machine processing, and the surface treatment aims at removing a rust layer and an oxidation layer on the surface of a blank so as to completely expose fresh metal on the surface.
In the step (2), the main component of the separant is MgO powder.
In the step (3), the components of the seal are consistent with those of the base material, the width of the seal is 30-60 mm, and the height of the seal is the sum of the thickness of the two superposed titanium plates and the thickness of the two superposed sheets; the welding depth of the seal and the upper blank and the lower blank is 30-60 mm, so that enough welding line strength is provided to ensure that the composite blank is not cracked in the rolling process. Preferably, the width of the seal is 35-55 mm.
The components of the lamination in the step (3) are consistent with those of the base material, the lamination is a circular lamination, the diameter of the lamination is 10-30 mm, and the thickness of the lamination is 0.5-2 mm; the arrangement modes of the laminations on the surface to be compounded of the lower blank and the surfaces to be compounded of the upper blank are the same, and the laminations are arranged at intervals of 0.5-1.5 m; preferably, the lamination positions on the surface to be compounded of the lower blank and the lamination positions on the surface to be compounded of the upper blank are in one-to-one correspondence, so that the titanium plate is prevented from deforming in the process of combining and compacting the blank, the titanium plate is ensured to be isolated from the surface to be compounded of the base material, and meanwhile, an oxide layer and welding slag caused by spot welding need to be polished and cleaned after spot welding, so that the surface to be compounded is ensured to be clean. Preferably, the thickness of the lamination is 1-2 mm.
Welding in the step (4) by adopting a vacuum electron beam welding method, wherein the vacuum degree is less than 5 × 10 during welding-2Pa; and welding the upper blank and the lower blank of the symmetrically combined blank with the seal and the gaps between the seal and the seal by welding. The welding depth is 30-60 mm.
And (5) controlling the heating temperature to be 850-930 ℃ and the heating time to be 10-30 min/cm according to the thickness of the symmetrical combined blank. Preferably, the heating temperature is 880-910 ℃.
In the step (6), a conventional rolling and post-rolling rapid cooling mode is adopted, the descaling box does not descale, and the rolling is descaled for the first time; and (4) high-speed steel throwing after rolling. The finishing temperature of the hot rolling is more than or equal to 700 ℃, the rolling with large reduction is adopted, the total rolling reduction rate is more than or equal to 80 percent, and the maximum single-pass reduction rate is more than or equal to 20 percent. The cooling is rapid cooling or air natural cooling, the rapid cooling is carried out at the speed of 2-20 ℃/s, and the temperature of red return is controlled at 400-700 ℃; when the total rolling thickness is larger than 16mm, rapid cooling is adopted; when the rolling total thickness is less than or equal to 16mm, rapid cooling or air natural cooling is adopted.
The straightening and cooling steps in the step (7) are as follows: straightening the rolled composite plate, cooling the composite plate on a cooling bed after straightening, and taking the composite plate off line when the surface temperature is reduced to below 300 ℃; the cutting and board dividing steps are as follows: and after the composite board is subjected to head cutting, tail cutting and two sides in a plasma mode, separating an upper single-sided composite board from a lower single-sided composite board, straightening the single-sided composite boards, and finally obtaining the titanium steel composite board product with the required specification after surface polishing, performance detection and packaging. The total thickness of the titanium steel composite plate product is 6-60 mm, and the thickness of the clad material is 0.5-5 mm.
Has the advantages that:
(1) according to the invention, the manner of adding the lamination between titanium and steel in the assembly process is adopted, so that the titanium and steel are completely isolated in the heating process, the mutual diffusion of elements in the heating process is prevented, and the generation of brittle phases such as TiC, TiFe and the like at the interface is effectively prevented; and (3) rolling under high pressure to destroy an interface oxide film to form a new bonding interface, and simultaneously, rapidly cooling after rolling to prevent a brittle phase from being formed again so as to obtain the titanium steel composite plate with high bonding performance.
(2) The invention directly seals and welds in the vacuum chamber environment, reduces the procedures of the traditional technology such as submerged arc sealing, drilling, vacuumizing and the like, effectively prevents the oxidation of the surface to be compounded by the submerged arc sealing, and simultaneously ensures the vacuum degree.
(3) According to the invention, the lamination is added between the titanium and steel composite surfaces, so that the generation of the interface brittle phase of the titanium steel composite plate is effectively prevented, compared with the method of adding the nickel foil or the copper foil in the middle layer, the operation is simpler, the production cost is lower, and the high-bonding-performance titanium steel composite plate product can be obtained.
Drawings
FIG. 1 is a schematic view of a lamination placed on a surface to be laminated of a substrate blank, wherein 1 is the substrate blank and 2 is the lamination;
FIG. 2 is a microstructure view of the interface of the titanium steel composite plate of example 2.
Detailed Description
Example 1
In this example, a Q235B steel grade with a base material billet thickness of 66mm, a commercial pure titanium TA2 with a cover material billet thickness of 6mm, and a TA2/Q235B composite plate with a rolled finished product thickness of 0.5+5.5mm were selected.
I, surface treatment: and (3) polishing the surfaces to be compounded of the two Q235B substrate blanks and the two TA2 cover material blanks, and removing rust layers and oxidation layers on the surfaces of the blanks to ensure that fresh metal is completely exposed on the surfaces.
II, coating a release agent: and (4) coating a release agent on the non-polished surface of the clad material, and then drying the release agent.
III, symmetrically combining blanks: selecting one of the base materials as a lower blank, fixing the periphery of the surface to be compounded of the base material by using seal spot welding, wherein the width of the seal is 30mm, the thickness of the seal is 13mm, placing a circular lamination on the surface to be compounded of the base material in a groove defined by the seal at intervals of 0.5m (the distance of an arrow shown in figure 1), and fixing the lamination on the surface to be compounded of the lower blank by using a spot welding mode, wherein the size of the lamination is phi 10 multiplied by 0.5 mm; then the non-composite surfaces of the two clad materials are overlapped and placed in the groove. And then, taking the other base material as an upper blank, performing spot welding on the lamination at the same position of the surface to be compounded which is symmetrical with the lower blank, then, covering the surface to be compounded of the upper blank with the surface to be compounded facing downwards on the two laminated clad materials to ensure that the four side edges of the upper and lower base materials are flush with the outer edge of the seal strip, thus forming the composite blank to be sealed and welded.
VI, electron beam sealing and welding, namely conveying the assembled composite blank to a vacuum chamber, then vacuumizing the vacuum chamber until the vacuum degree of the vacuum chamber reaches 3 × 10-2And when Pa is required, welding a gap between the seal and the base material by adopting an electron beam, wherein the welding depth of the upper blank and the welding depth of the lower blank are both 30mm, so that the composite blank with the total thickness of 145mm is obtained.
V, heating: and (3) conveying the composite blank to a stepping heating furnace for heating at 900 ℃ for 240 min.
VI, rolling and cooling: and (3) rolling by adopting a conventional mode, wherein the descaling box does not descale, and the first-pass descaling is carried out in the rolling process. The total rolling reduction rate is 91.7%, the maximum pass reduction rate is 28%, the final rolling temperature is controlled to be about 720 ℃, the final rolling thickness is 12mm, and air is adopted for natural cooling after rolling.
VII, straightening and cutting the split plate: after straightening, the steel plate is cooled on a cooling bed, and the steel plate is off-line when the surface temperature is reduced to 300 ℃. After the head and the tail are cut and two sides are cut, an upper single-layer composite board and a lower single-layer composite board are separated, the single-layer composite boards are straightened, then the surface of the clad material is polished, and finally a finished TA2/Q235B composite board product with the thickness of 0.5+5.5mm is obtained.
The test shows that the shear strength of the TA2/Q235B composite board is about 272MPa, and the composite board has high bonding performance.
Example 2
In this example, a Q345B steel grade with a base material billet thickness of 100mm, a TA2 industrial pure titanium plate with a cover material billet thickness of 10mm, and a TA2/Q345B composite plate with a finished product thickness of 2+20mm were selected.
I, surface treatment: and (3) polishing the surfaces to be compounded of the two Q345B substrate blanks and the two TA2 cover material blanks, and removing rust layers and oxidation layers on the surfaces of the blanks to ensure that fresh metal is completely exposed on the surfaces.
II, coating a release agent: and (4) coating a release agent on the non-polished surface of the clad material, and then drying the release agent.
III, symmetrically combining blanks: selecting one of the base materials as a lower blank, fixing the periphery of the surface to be compounded of the base material by using seal spot welding, wherein the width of the seal is 45mm, the thickness of the seal is 23mm, placing circular lamination sheets on the surface to be compounded of the base material in a groove defined by the seal at intervals of 0.8 m, and fixing the lamination sheets on the surface to be compounded of the lower blank by using a spot welding mode, wherein the size of the lamination sheets is phi 20 multiplied by 1.5 mm; then the non-composite surfaces of the two clad materials are overlapped and placed in the groove. And then, taking the other base material as an upper blank, performing spot welding on the lamination at the same position of the surface to be compounded which is symmetrical with the lower blank, then, covering the surface to be compounded of the upper blank with the surface to be compounded facing downwards on the two laminated clad materials to ensure that the four side edges of the upper and lower base materials are flush with the outer edge of the seal strip, thus forming the composite blank to be sealed and welded.
VI, electron beam sealing and welding, namely conveying the assembled composite blank to a vacuum chamber, then vacuumizing the vacuum chamber until the vacuum degree of the vacuum chamber reaches 4 × 10-2And when Pa is required, welding a gap between the seal and the base material by adopting an electron beam, wherein the welding depth of the upper blank and the welding depth of the lower blank are both 45mm, so that the composite blank with the total thickness of 223mm is obtained.
V, heating: and (3) conveying the composite blank to a stepping heating furnace for heating, wherein the heating temperature is 850 ℃, and the total heating time is 360 min.
VI, rolling and cooling: and (3) rolling by adopting a conventional mode, wherein the descaling box does not descale, and the first-pass descaling is carried out in the rolling process. The total rolling reduction rate is 80.3 percent, the maximum pass reduction rate is 25 percent, the final rolling temperature is controlled to be about 790 ℃, and the final rolling thickness is 44 mm. And (3) after rolling, high-speed steel throwing, and quickly cooling the composite plate in ultra-fast cooling at the cooling speed of 4 ℃/s and the re-reddening temperature of 650 ℃.
VII, straightening and cutting the split plate: then the steel is straightened and is cooled on a cooling bed, and the steel is off-line when the surface temperature is reduced to 300 ℃. After cutting the head, the tail and two sides, separating an upper single-layer composite board from a lower single-layer composite board, straightening the single-layer composite boards, and polishing the surface of the clad material to finally obtain a finished TA2/Q345B composite board product with the thickness of 2+20 mm.
According to the test, the shear strength of the TA2/Q345B composite plate added with the lamination assembly is about 252MPa, and the composite plate has high bonding performance, while the shear strength of the TA2/Q345B composite plate added with the nickel foil of the middle layer and having the same thickness is only 243MPa according to the comparative example 1, as shown in the table 1. Therefore, the added lamination can effectively block the interface reaction of the titanium steel and obtain high shear strength. An interfacial microstructure diagram of the TA2/Q345B titanium steel composite plate is shown in figure 2, no unbonded area is found between the titanium and the steel, and the composite plate achieves good metallurgical bonding.
Example 3
In this example, a grade of Q370R steel with a substrate billet thickness of 275mm was selected, a grade of TA1 commercial pure titanium with a cover billet thickness of 25mm was selected, and a TA1/Q370R clad plate with a thickness of 5+55mm was rolled.
I, surface treatment: and (3) polishing the surfaces to be compounded of the two Q370R substrate blanks and the two TA1 cover material blanks, and removing rust layers and oxidation layers on the surfaces of the blanks to ensure that fresh metal is completely exposed on the surfaces.
II, coating a release agent: and (4) coating a release agent on the non-polished surface of the clad material, and then drying the release agent.
III, symmetrically combining blanks: selecting one of the base materials as a lower blank, fixing the periphery of the surface to be compounded of the base material by using seal spot welding, wherein the width of the seal is 60mm, the thickness of the seal is 54mm, placing a circular lamination on the surface to be compounded of the base material in a groove defined by the seal at intervals of 1.5 meters, and fixing the lamination on the surface to be compounded of the lower blank in a spot welding mode, wherein the size of the lamination is phi 30 multiplied by 2.0 mm; then the non-composite surfaces of the two clad materials are overlapped and placed in the groove. And then, taking the other base material as an upper blank, performing spot welding on the lamination at the same position of the surface to be compounded which is symmetrical with the lower blank, then, covering the surface to be compounded of the upper blank with the surface to be compounded facing downwards on the two laminated clad materials to ensure that the four side edges of the upper and lower base materials are flush with the outer edge of the seal strip, thus forming the composite blank to be sealed and welded.
VI, electron beam sealing and welding, namely conveying the assembled composite blank to a vacuum chamber, then vacuumizing the vacuum chamber until the vacuum degree of the vacuum chamber reaches 5 × 10-2And when Pa is required, welding a gap between the seal and the base material by adopting an electron beam, wherein the welding depth of the upper blank and the welding depth of the lower blank are both 60mm, so that the composite blank with the total thickness of 604mm is obtained.
V, heating: and (3) conveying the composite blank to a trolley furnace for heating, wherein the heating temperature is 880 ℃, and the total heating time is 820 min.
VI, rolling and cooling: and (3) rolling by adopting a conventional mode, wherein the descaling box does not descale, and the first-pass descaling is carried out in the rolling process. The total rolling reduction rate is 80.1 percent, the maximum pass reduction rate is 22 percent, the final rolling thickness is 120mm, and the final rolling temperature is controlled to be about 810 ℃. And (3) after rolling, high-speed steel throwing, and quickly cooling the composite plate in ultra-fast cooling at the cooling speed of 6 ℃/s and the re-reddening temperature of 630 ℃.
VII, straightening and cutting the split plate: then the steel is straightened and is cooled on a cooling bed, and the steel is off-line when the surface temperature is reduced to 300 ℃. After the head and the tail are cut and two sides are cut, an upper single-layer composite board and a lower single-layer composite board are separated, the single-layer composite boards are straightened, then the surface of the clad material is polished, and finally a finished TA1/Q370R composite board product with the thickness of 5+55mm is obtained.
The test shows that the shear strength of the TA1/Q370R composite board is about 232MPa, and the composite board still has high bonding performance in a large-thickness composite board.
Example 4
In this example, an X70 steel grade with a base material billet thickness of 98mm, a TA1 industrial pure titanium plate with a cover material billet thickness of 14mm, and a TA1/X70 pipeline titanium steel composite plate with a rolled finished product thickness of 2+14mm were selected.
I, surface treatment: and (3) polishing the surfaces to be compounded of the two X70 substrate blanks and the two TA1 cover material blanks, and removing rust layers and oxidation layers on the surfaces of the blanks to ensure that fresh metal is completely exposed on the surfaces.
II, coating a release agent: and (4) coating a release agent on the non-polished surface of the clad material, and then drying the release agent.
III, symmetrically combining blanks: selecting one of the base materials as a lower blank, fixing the periphery of the surface to be compounded of the base material by using seal spot welding, wherein the width of the seal is 40mm, the thickness of the seal is 30mm, placing circular lamination sheets on the surface to be compounded of the base material in a groove defined by the seal at intervals of 0.5m, and fixing the lamination sheets on the surface to be compounded of the lower blank by using a spot welding mode, wherein the size of the lamination sheets is phi 10 multiplied by 1.0 mm; then the non-composite surfaces of the two clad materials are overlapped and placed in the groove. And then, taking the other base material as an upper blank, performing spot welding on the lamination at the same position of the surface to be compounded which is symmetrical with the lower blank, then, covering the surface to be compounded of the upper blank with the surface to be compounded facing downwards on the two laminated clad materials to ensure that the four side edges of the upper and lower base materials are flush with the outer edge of the seal strip, thus forming the composite blank to be sealed and welded.
VI, electron beam sealing and welding: the assembled composite blanks are sent to a vacuum chamber and thenVacuumizing the vacuum chamber until the vacuum degree of the vacuum chamber reaches 3 × 10-2And when Pa, welding a gap between the seal and the base material by adopting an electron beam, wherein the welding depth of the upper blank and the welding depth of the lower blank are both 40mm, so that the composite blank with the total thickness of 226mm is obtained.
V, heating: and (3) conveying the composite blank to a step furnace for heating, wherein the heating temperature is 930 ℃, and the total heating time is 350 min.
VI, rolling and cooling: and (3) rolling by adopting a conventional mode, wherein the descaling box does not descale, and the first-pass descaling is carried out in the rolling process. The total rolling reduction rate is 85.8 percent, the maximum pass reduction rate is 27 percent, the final rolling thickness is 32mm, and the final rolling temperature is controlled to be about 800 ℃. And (3) after rolling, high-speed steel throwing, and quickly cooling the composite plate in ultra-fast cooling at the cooling speed of 20 ℃/s and the re-reddening temperature of 400 ℃.
VII, straightening and cutting the split plate: then the steel is straightened and is cooled on a cooling bed, and the steel is off-line when the surface temperature is reduced to 300 ℃. After cutting the head, the tail and two sides, separating an upper single-layer composite board from a lower single-layer composite board, straightening the single-layer composite boards, and polishing the surface of the clad material to finally obtain a finished titanium steel composite board product for TA1/X70 pipelines with the thickness of 2+14 mm.
The test shows that the shear strength of the TA1/X70 composite board is about 268MPa, and the composite board has high bonding performance.
Comparative example 1
The preparation method is the same as the example 2, except that in the step III, when the blanks are symmetrically combined, the lamination is not added, but the nickel foil with the middle layer is selected and added, and the specific process is as follows: firstly, two nickel foils which are consistent with the length and width of the clad material and have the thickness of 0.5mm are additionally prepared, and oxide layers on the upper surface and the lower surface of each nickel foil are cleaned to ensure that the upper surface and the lower surface are clean. Selecting one of the base materials as a lower blank, fixing the periphery of the surface to be compounded of the lower blank by using seal spot welding, wherein the width of the seal is 45mm, the thickness of the seal is 21mm, and placing one of nickel foils on the surface to be compounded of the base material in a groove defined by the seal; then the non-composite surfaces of the two clad materials are overlapped and placed on the nickel foil in the groove, and then another nickel foil is placed on the two overlapped clad materials. And then, taking the other base material as an upper blank, covering the upper blank with the surface to be compounded facing downwards on the nickel foil, and simultaneously ensuring that four side edges of the upper and lower base materials are flush with the outer edge of the seal strip, thus forming the composite blank to be sealed and welded. And VI, sealing and welding by using an electron beam to obtain the composite blank with the total thickness of 221 mm. And then heating, rolling and cooling, straightening, cutting and splitting to obtain the TA2/Q345B composite board with the thickness of 2+20mm and the nickel foil added with the middle layer, wherein the shear strength is 243MPa through detection and is shown in Table 1.
Comparative example 2
The preparation method is the same as example 2, except that direct assembly is adopted when the blanks are symmetrically combined in the step III, no lamination or intermediate layer is added, and the TA2/Q345B composite board with the thickness of 2+20mm is prepared. Through detection, the shear strength of the directly assembled titanium steel composite plate TA2/Q345B is only 178MPa, and is shown in Table 1.
The comparison of the data in table 1 shows that by adding the lamination, the titanium steel composite plate with high bonding performance can be prepared, and the shear strength of the titanium steel composite plate is equivalent to that of the titanium foil added with the intermediate layer and far exceeds that of the titanium steel composite plate prepared by directly assembling. But the process is simple and the cost is low by adding the lamination assembly; the nickel foil with the middle layer is expensive, and the operation of cleaning the upper surface and the lower surface of the nickel foil is complicated, so that the cost is high.
TABLE 1 comparison of shear strengths of titanium steel composite panels prepared with added laminations, with added interlayer nickel foil, and with direct assembly
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. The preparation method of the titanium steel composite plate is characterized by comprising the following steps:
(1) carrying out surface treatment on the surfaces to be compounded of the base material and the cover material blank; wherein the base material is carbon steel or low-alloy high-strength steel, and the clad material is industrial pure titanium; the surface treatment method is abrasive belt grinding or milling machine processing;
(2) coating a release agent on the non-composite surface of the clad material obtained in the step (1), and drying;
(3) selecting a base material obtained in the step (1) as a lower blank, fixing the periphery of the surface to be compounded of the lower blank by using seal bars in a spot welding manner to form a groove in a surrounding manner, fixing a plurality of lamination sheets on the surface to be compounded of the lower blank in the groove in a spot welding manner, then superposing the non-compounded surfaces of the two cladding materials obtained in the step (2) in a groove, using the other base material obtained in the step (1) as an upper blank, fixing a plurality of lamination sheets on the surface to be compounded of the upper blank in a spot welding manner, covering the surface to be compounded of the upper blank on the two cladding materials downwards, and ensuring that the outer edges of the periphery of the upper blank and the periphery of the lower blank are parallel and level with the outer edge of the seal bar to form a; the components of the lamination are consistent with those of the base material, the lamination is a circular lamination, the diameter of the lamination is 10-30 mm, and the thickness of the lamination is 0.5-2 mm; the arrangement modes of the laminations on the surface to be compounded of the lower blank and the surfaces to be compounded of the upper blank are the same, and the laminations are arranged at intervals of 0.5-1.5 m;
(4) welding the symmetrical combined blank obtained in the step (3) in a vacuum environment;
(5) heating the symmetrical combined blank obtained in the step (4); the heating temperature is 850-930 ℃, and the heating time is controlled according to the thickness of the combined blank and 10-30 min/cm;
(6) carrying out hot rolling and cooling on the symmetrical combined blank obtained in the step (5); the finishing temperature of the hot rolling is more than or equal to 700 ℃, the total rolling reduction rate is more than or equal to 80 percent, and the single-pass maximum reduction rate is more than or equal to 20 percent; the cooling is rapid cooling or air natural cooling; the rapid cooling is carried out at the speed of 2-20 ℃/s, and the temperature of the red returning is controlled to be 400-700 ℃; when the total rolling thickness is larger than 16mm, rapid cooling is adopted; when the rolling total thickness is less than or equal to 16mm, adopting quick cooling or air natural cooling;
(7) and (4) straightening, cutting and splitting the symmetrical combined blank obtained in the step (6) to obtain the titanium steel composite board.
2. The production method according to claim 1, wherein the partitioning agent in step (2) is MgO powder as a main component.
3. The method of claim 1, wherein the composition of the seal in step (3) is the same as the base material, the width of the seal is 30-60 mm, and the height of the seal is the sum of the thickness of the two laminated cover materials and the thickness of the two laminated sheets.
4. The preparation method according to claim 1, wherein in the step (4), the upper blank and the lower blank of the symmetrically combined blank are welded with the seal and the gaps between the seal and the seal by a vacuum electron beam welding method, the welding depth is 30-60 mm, and the vacuum degree during welding is less than 5 × 10-2Pa。
5. The preparation method according to claim 1, wherein the total thickness of the titanium steel composite plate in the step (7) is 6-60 mm, and the thickness of the clad material is 0.5-5 mm.
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| KR1020207023579A KR102225672B1 (en) | 2018-02-02 | 2018-12-05 | Manufacturing method of titanium-steel composite plate |
| PCT/CN2018/119274 WO2019148961A1 (en) | 2018-02-02 | 2018-12-05 | Method for preparing titanium-steel composite plate |
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| CN108326516B (en) * | 2018-02-02 | 2020-08-18 | 南京钢铁股份有限公司 | Preparation method of titanium steel composite board |
| EP3849738A1 (en) * | 2018-09-13 | 2021-07-21 | ArcelorMittal | An assembly of at least 2 metallic substrates |
| WO2020053736A1 (en) | 2018-09-13 | 2020-03-19 | Arcelormittal | A welding method for the manufacture of an assembly of at least 2 metallic substrates |
| MX2021002858A (en) | 2018-09-13 | 2021-05-28 | Arcelormittal | An assembly of at least 2 metallic substrates. |
| CN109317515B (en) * | 2018-10-19 | 2021-04-27 | 太原钢铁(集团)有限公司 | Rolling method for obtaining multiple hot rolled plates at one time |
| CN111659989A (en) * | 2020-05-25 | 2020-09-15 | 中山大学 | Method for preparing titanium steel composite plate through cladding |
| CN112108753B (en) * | 2020-09-17 | 2022-04-22 | 核工业西南物理研究院 | Welding method for vacuum electron beam single-side welding and double-side forming of 316LN-IG stainless steel |
| CN112872573B (en) * | 2021-01-19 | 2022-08-26 | 西部金属材料股份有限公司 | Large-specification metal blank containing easily segregated elements, super-large-specification metal blank and preparation method and application thereof |
| CN113732623B (en) * | 2021-07-01 | 2023-01-24 | 陕西铁路工程职业技术学院 | Butt welding connection method for composite plates |
| CN114043178B (en) * | 2021-12-07 | 2023-02-03 | 中国人民解放军陆军工程大学 | Novel vacuum creep-pressing compounding method for dissimilar metal composite material |
| CN114571827B (en) * | 2022-02-28 | 2023-04-21 | 北京科技大学 | Method for preparing titanium/steel layered composite material by regulating and controlling interfacial intermetallic compound |
| CN115319429B (en) * | 2022-10-17 | 2023-02-03 | 西安稀有金属材料研究院有限公司 | Method for crystallizing both welding seam area and base material area of titanium or titanium alloy welding plate |
| CN115958387B (en) * | 2022-11-28 | 2023-11-07 | 南京首勤特种材料有限公司 | Preparation method of stainless steel composite board, product and application thereof |
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| KR102225672B1 (en) | 2021-03-12 |
| KR20200105522A (en) | 2020-09-07 |
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