CN111809084A - High-strength high-ductility composite board material and processing technology thereof - Google Patents
High-strength high-ductility composite board material and processing technology thereof Download PDFInfo
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- CN111809084A CN111809084A CN202010657149.2A CN202010657149A CN111809084A CN 111809084 A CN111809084 A CN 111809084A CN 202010657149 A CN202010657149 A CN 202010657149A CN 111809084 A CN111809084 A CN 111809084A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
The invention relates to a processing technology of a high-strength high-ductility composite board material, wherein a multi-layer composite material consists of a brazing layer and a core layer, the brazing layer adopts A4045 aluminum alloy and plays a role of melting firstly, spreading and then welding in brazing, the core layer is 3003Mod aluminum alloy, the melting point of the core layer is higher than 65 ℃ of the brazing layer material, the core layer has certain strength in brazing and can not be melted, and the function of maintaining the strength of the whole material matrix is achieved, and the processing technological process comprises the following steps: the high-strength high-ductility multilayer composite material for the water tank main board prepared by the method has better higher strength and better ductility compared with the traditional material, and can be widely applied to the fields of automobile water tanks and the like.
Description
Technical Field
The invention relates to the technical field of automobile heat exchange materials, in particular to a high-strength high-ductility composite plate material and a processing technology thereof.
Background
In recent years, the light weight of vehicles such as automobiles and the like becomes an important item for strategic development of the manufacturing industry in China, the light weight heat transfer aluminum alloy composite material has the strategic significance of driving the global development of the manufacturing industry in China and realizing the modernization and high technology of the manufacturing industry, the weight of an automobile is reduced by 10 percent, the oil consumption can be reduced by 6 to 8 percent, the fuel efficiency is improved by 5 to 8 percent, the oil consumption can be reduced by 0.7L every 100 kilograms, the weight reduction and the energy saving are key technical problems which must be solved in the development process of the automobile industry, the heat transfer aluminum alloy composite material has wide application market in the field of automobile cooling systems (automobile water tanks and fan heaters), the light weight, high strength, corrosion resistance and thickness reduction of the heat transfer aluminum alloy composite material have great relation to the weight reduction and the energy saving and emission reduction of the automobile, different cooling media have great influence on the service life of the material, and simultaneously, the processing, however, the existing materials for the water tank main plate have the problems of insufficient strength and ductility after brazing, and therefore a high-strength high-ductility composite plate material and a processing technology thereof need to be designed to solve the problems.
Disclosure of Invention
The invention aims to provide a high-strength high-ductility composite board material and a processing technology thereof aiming at the problems of insufficient strength and ductility after brazing of a water tank main board at present, and the specific technical scheme is as follows:
the high-strength high-ductility composite board material sequentially comprises a brazing layer and a core layer, wherein the brazing layer is composed of A4045 aluminum alloy, the thickness ratio of the brazing layer to the whole material is 6 +/-1.5%, and the core layer is composed of 3003Mod aluminum alloy.
The invention is further improved in that: the brazing layer comprises the following materials: 9.0 to 11.0 percent of Si-, less than or equal to 0.3 percent of Fe-, less than or equal to 0.15 percent of Cu-, less than or equal to 0.05 percent of Mn-, less than or equal to 0.03 percent of Mg-, less than or equal to 0.1 percent of Zn-, and the balance of Al.
The invention is further improved in that: the core layer comprises the following materials: si-less than or equal to 0.2 percent, Fe-0.15-0.32 percent, Cu-0.5-0.8 percent, Mn-1.4-2.3 percent, Mg-less than or equal to 0.1 percent, Zn-less than or equal to 0.2 percent, Ti-less than or equal to 0.05 percent, Zr-0.05-0.2 percent and the balance of Al.
The invention is further improved in that: the method comprises the following specific steps:
step 1: carrying out material component ratio of the brazing layer and the core layer;
step 2: a smelting process: the brazing layer 4045 is added with Si blocks at the melting temperature of 750-760 ℃, stirred for 20-30 minutes, and then added with aluminum ingots to be cooled to 740-750 ℃; refining and slagging off; the core layer 3003Mod is smelted at the temperature of 760-780 ℃, Cu and Mn intermediate alloy is added, the mixture is stirred for 20-30 minutes, then aluminum ingots are added, the temperature is reduced to 750-760 ℃, and the mixture is refined and slag is removed; and step 3: refining degassing: after the components of the alloy are qualified, refining by adopting argon for 20-25 minutes at the refining temperature of 750-760 ℃, and detecting that the hydrogen content of the liquid aluminum alloy is not higher than 0.15 ml/100 gAl; and 4, step 4: a filtering process: filtering by adopting a 30PPi +40PPi double-stage ceramic filter plate; and 5: a casting procedure: performing the process according to the casting temperature of 680-710 ℃, the casting speed of 45-55mm/min, the water pressure of 0.1-0.2Mpa and the water temperature of less than or equal to 30 ℃ to obtain a flat ingot meeting the internal control standard; step 6: a sawing procedure: the sawing length of the ingot casting gate part is 150 mm and 200 mm; and 7: a soaking process: carrying out ingot casting soaking treatment by adopting a process of 600-; and 8: a face milling procedure: the milling amount of the large surface of the cast ingot is 10-12mm per surface; and step 9: a compounding procedure: polishing the contact surface of the brazing layer and the core layer, cleaning two large surfaces of the core layer, stacking the two large surfaces in sequence, and bundling the two large surfaces by using a steel belt; step 10: a hot rolling procedure: hot rolling, bonding and rolling the 445mm thick cast ingot obtained in the above steps to obtain an aluminum coil with the thickness of 5-7 mm; step 11: a cold rolling procedure: cold rolling the coil obtained by the hot rolling by using a proper cold working rate until the thickness of the coil is 1.3-1.8 mm; step 12: an annealing process; step 13: and (5) cutting.
The invention is further improved in that: the finishing temperature of the hot rolling process of the step 10 is 300 ℃ to 340 ℃.
The invention is further improved in that: annealing step 12: and (3) carrying out roll annealing by adopting an annealing process of annealing the finished product at the metal temperature of 405 +/-3 ℃ for 1.5 hours, protecting by using nitrogen, and sending the aluminum roll with the preset thickness into the annealing furnace for annealing the finished product.
The invention is further improved in that: and step 13, in the slitting process, thick longitudinal scissors are used for shearing, and the height of burrs is controlled within 50 microns.
The invention is further improved in that: and (3) obtaining a qualified composite aluminum strip through precision slitting, wherein the thickness of a brazing layer in the composite aluminum strip accounts for 4.5-7.5% of the total thickness, and the final delivery state of the material is in an O state.
The invention has the beneficial effects that:
the high-strength high-ductility multilayer composite material of the invention improves the strength and ductility, reduces the thickness by 20 percent compared with the thickness of the common pipe material, plays a decisive role in reducing the weight of the water tank, saves the material cost for customers, achieves the design purpose through batch production, meanwhile, the preparation method of the high-strength corrosion-resistant composite aluminum alloy material comprises the steps of selecting inner and outer layer alloy components which are matched with each other, preparing a core material ingot and a skin material ingot by adopting a semi-continuous casting method, wherein the skin material ingot is a brazing layer, sawing, milling, heating, hot rolling and slicing the skin material ingot to obtain the required skin material, and then compounding the alloy with a milled core ingot, and performing hot rolling, cold rolling, annealing and cutting on the compounded ingot to obtain a material meeting the requirements.
Detailed Description
The first embodiment is as follows:
the utility model provides a high-strength high-ductility composite board material, includes brazing layer and sandwich layer in proper order, the brazing layer comprises A4045 aluminum alloy, the thickness of brazing layer accounts for whole material thickness ratio and is 6 +/-1.5%, the sandwich layer comprises 3003Mod aluminum alloy, the material composition on brazing layer is: 9.0% by weight of Si, 0.1% by weight of Fe, 0.1% by weight of Cu, 0.02% by weight of Mn, 0.01% by weight of Mg, 0.05% by weight of Zn, and the balance of Al, wherein the core layer comprises the following materials: 0.1% by weight of Si, 0.15% by weight of Fe, 0.5% by weight of Cu, 1.5% by weight of Mn, 0.05% by weight of Mg, 0.1% by weight of Zn, 0.02% by weight of Ti, 0.05% by weight of Zr, and the balance of Al.
According to the chemical components, the high-strength high-ductility composite board material is obtained through the following steps, wherein the process flow comprises the following steps of 1: carrying out material component ratio of the brazing layer and the core layer; step 2: a smelting process: the brazing layer 4045 is added with Si blocks at the melting temperature of 750-760 ℃, stirred for 20-30 minutes, and then added with aluminum ingots to be cooled to 740-750 ℃; refining and slagging off; the core layer 3003Mod is smelted at the temperature of 760-780 ℃, Cu and Mn intermediate alloy is added, the mixture is stirred for 20-30 minutes, then aluminum ingots are added, the temperature is reduced to 750-760 ℃, and the mixture is refined and slag is removed; and step 3: refining degassing: after the components of the alloy are qualified, refining by adopting argon for 20-25 minutes at the refining temperature of 750-760 ℃, and detecting that the hydrogen content of the liquid aluminum alloy is not higher than 0.15 ml/100 gAl; and 4, step 4: a filtering process: filtering by adopting a 30PPi +40PPi double-stage ceramic filter plate; and 5: a casting procedure: performing the process according to the casting temperature of 680-710 ℃, the casting speed of 45-55mm/min, the water pressure of 0.1-0.2Mpa and the water temperature of less than or equal to 30 ℃ to obtain a flat ingot meeting the internal control standard; step 6: a sawing procedure: the sawing length of the ingot casting gate part is 150 mm and 200 mm; and 7: a soaking process: carrying out ingot casting soaking treatment by adopting a process of 600-; and 8: a face milling procedure: the milling amount of the large surface of the cast ingot is 10-12mm per surface; and step 9: a compounding procedure: polishing the contact surface of the brazing layer and the core layer, cleaning two large surfaces of the core layer, stacking the two large surfaces in sequence, and bundling the two large surfaces by using a steel belt; step 10: a hot rolling procedure: rolling the 445mm thick ingot obtained by the steps into an aluminum coil with the thickness of 5-7mm through hot rolling, bonding and rolling, wherein the final rolling temperature of the hot rolling procedure is 300-340 ℃; step 11: a cold rolling procedure: cold rolling the coil obtained by the hot rolling by using a proper cold working rate until the thickness of the coil is 1.3-1.8 mm; step 12: annealing, namely performing roll annealing by adopting an annealing process of annealing the finished product at the metal temperature of 405 +/-3 ℃ for 1.5 hours, protecting by using nitrogen, and sending the aluminum roll with the preset thickness into the annealing furnace to perform finished product annealing; step 13: and a slitting process, namely using thick longitudinal shears to perform shearing, controlling the height of burrs within 50 mu m, and performing precise slitting to obtain a qualified composite aluminum strip, wherein the thickness of a brazing layer in the composite aluminum strip accounts for 4.5-7.5% of the total thickness, and the final delivery state of the material is in an O state.
The process flow using method comprises the following steps:
using the core alloy and the skin alloy, casting a flat ingot with the length of 5750mm, the width of 1340mm and the thickness of 445mm by using casting equipment in a casting workshop, detecting chemical components of the alloy, sawing and milling the ingot, wherein the size of the ingot after sawing and milling is 425 multiplied by 1340 multiplied by 5500mm, then putting the ingot into a heating furnace, heating at 475 ℃/8h, then hot rolling, rolling a brazing layer to the thickness of 30mm, only milling the surface of a core layer ingot, then binding the brazing layer and the core layer together by using a steel strip, carrying out hot rolling until the thickness is 6mm, then carrying out cold rolling, cold rolling until the thickness is 1.3mm, then annealing to an O state according to requirements, then slitting to obtain a composite aluminum coil with the thickness of 1.3 multiplied by 55mm, carrying out simulated brazing in a muffle furnace, wherein a stainless steel box with the space of 5 square decimeters is contained in the muffle furnace, the stainless steel box is filled with nitrogen, carrying out linear heating from room temperature to 600 ℃ within 45, the temperature was maintained for 3min, after which the muffle was taken out and cooled in air to room temperature, table 1 shows the results of the post-braze experiments.
TABLE 1 mechanical Properties after welding of alloy examples and comparative examples
Example two:
the utility model provides a high-strength high-ductility composite board material, includes brazing layer and sandwich layer in proper order, the brazing layer comprises A4045 aluminum alloy, the thickness of brazing layer accounts for whole material thickness ratio and is 6 +/-1.5%, the sandwich layer comprises 3003Mod aluminum alloy, the material composition on brazing layer is: 10% by weight of Si, 0.2% by weight of Fe, 0.12% by weight of Cu, 0.03% by weight of Mn, 0.02% by weight of Mg, 0.05% by weight of Zn, and the balance of Al, wherein the core layer is made of the following materials: 0.1% by weight of Si, 0.22% by weight of Fe, 0.65% by weight of Cu, 1.7% by weight of Mn, 0.05% by weight of Mg, 0.15% by weight of Zn, 0.03% by weight of Ti, 0.12% by weight of Zr, and the balance of Al.
According to the chemical components, the high-strength high-ductility composite board material is obtained through the following steps, wherein the process flow comprises the following steps of 1: carrying out material component ratio of the brazing layer and the core layer; step 2: a smelting process: the brazing layer 4045 is added with Si blocks at the melting temperature of 750-760 ℃, stirred for 20-30 minutes, and then added with aluminum ingots to be cooled to 740-750 ℃; refining and slagging off; the core layer 3003Mod is smelted at the temperature of 760-780 ℃, Cu and Mn intermediate alloy is added, the mixture is stirred for 20-30 minutes, then aluminum ingots are added, the temperature is reduced to 750-760 ℃, and the mixture is refined and slag is removed; and step 3: refining degassing: after the components of the alloy are qualified, refining by adopting argon for 20-25 minutes at the refining temperature of 750-760 ℃, and detecting that the hydrogen content of the liquid aluminum alloy is not higher than 0.15 ml/100 gAl; and 4, step 4: a filtering process: filtering by adopting a 30PPi +40PPi double-stage ceramic filter plate; and 5: a casting procedure: performing the process according to the casting temperature of 680-710 ℃, the casting speed of 45-55mm/min, the water pressure of 0.1-0.2Mpa and the water temperature of less than or equal to 30 ℃ to obtain a flat ingot meeting the internal control standard; step 6: a sawing procedure: the sawing length of the ingot casting gate part is 150 mm and 200 mm; and 7: a soaking process: carrying out ingot casting soaking treatment by adopting a process of 600-; and 8: a face milling procedure: the milling amount of the large surface of the cast ingot is 10-12mm per surface; and step 9: a compounding procedure: polishing the contact surface of the brazing layer and the core layer, cleaning two large surfaces of the core layer, stacking the two large surfaces in sequence, and bundling the two large surfaces by using a steel belt; step 10: a hot rolling procedure: rolling the 445mm thick ingot obtained by the steps into an aluminum coil with the thickness of 5-7mm through hot rolling, bonding and rolling, wherein the final rolling temperature of the hot rolling procedure is 300-340 ℃; step 11: a cold rolling procedure: cold rolling the coil obtained by the hot rolling by using a proper cold working rate until the thickness of the coil is 1.3-1.8 mm; step 12: annealing, namely performing roll annealing by adopting an annealing process of annealing the finished product at the metal temperature of 405 +/-3 ℃ for 1.5 hours, protecting by using nitrogen, and sending the aluminum roll with the preset thickness into the annealing furnace to perform finished product annealing; step 13: and a slitting process, namely using thick longitudinal shears to perform shearing, controlling the height of burrs within 50 mu m, and performing precise slitting to obtain a qualified composite aluminum strip, wherein the thickness of a brazing layer in the composite aluminum strip accounts for 4.5-7.5% of the total thickness, and the final delivery state of the material is in an O state.
The process flow using method comprises the following steps:
using the core alloy and the skin alloy, casting a flat ingot with the length of 5750mm, the width of 1340mm and the thickness of 445mm by using casting equipment in a casting workshop, detecting chemical components of the alloy, sawing and milling the ingot, wherein the size of the ingot after sawing and milling is 425 multiplied by 1340 multiplied by 5500mm, then putting the ingot into a heating furnace, heating at 475 ℃/8h, then hot rolling, rolling a brazing layer to the thickness of 30mm, only milling the surface of a core layer ingot, then binding the brazing layer and the core layer together by using a steel strip, carrying out hot rolling until the thickness is 6mm, then carrying out cold rolling, cold rolling until the thickness is 1.3mm, then annealing to an O state according to requirements, then slitting to obtain a composite aluminum coil with the thickness of 1.3 multiplied by 55mm, carrying out simulated brazing in a muffle furnace, wherein a stainless steel box with the space of 5 square decimeters is contained in the muffle furnace, the stainless steel box is filled with nitrogen, carrying out linear heating from room temperature to 600 ℃ within 45, the temperature was maintained for 3min, after which the muffle was taken out and cooled in air to room temperature, table 2 shows the results of the post-braze experiments.
TABLE 2 mechanical Properties of alloy examples and comparative examples after welding
Example three:
the utility model provides a high-strength high-ductility composite board material, includes brazing layer and sandwich layer in proper order, the brazing layer comprises A4045 aluminum alloy, the thickness of brazing layer accounts for whole material thickness ratio and is 6 +/-1.5%, the sandwich layer comprises 3003Mod aluminum alloy, the material composition on brazing layer is: 10.0% by weight of Si, 0.3% by weight of Fe, 0.15% by weight of Cu, 0.05% by weight of Mn, 0.03% by weight of Mg, 0.1% by weight of Zn, and the balance of Al, wherein the core layer is made of the following materials: 0.2% by weight of Si, 0.35% by weight of Fe, 0.8% by weight of Cu, 1.8% by weight of Mn, 0.1% by weight of Mg, 0.2% by weight of Zn, 0.05% by weight of Ti, 0.2% by weight of Zr, and the balance of Al.
According to the chemical components, the high-strength high-ductility composite board material is obtained through the following steps, wherein the process flow comprises the following steps of 1: carrying out material component ratio of the brazing layer and the core layer; step 2: a smelting process: the brazing layer 4045 is added with Si blocks at the melting temperature of 750-760 ℃, stirred for 20-30 minutes, and then added with aluminum ingots to be cooled to 740-750 ℃; refining and slagging off; the core layer 3003Mod is smelted at the temperature of 760-780 ℃, Cu and Mn intermediate alloy is added, the mixture is stirred for 20-30 minutes, then aluminum ingots are added, the temperature is reduced to 750-760 ℃, and the mixture is refined and slag is removed; and step 3: refining degassing: after the components of the alloy are qualified, refining by adopting argon for 20-25 minutes at the refining temperature of 750-760 ℃, and detecting that the hydrogen content of the liquid aluminum alloy is not higher than 0.15 ml/100 gAl; and 4, step 4: a filtering process: filtering by adopting a 30PPi +40PPi double-stage ceramic filter plate; and 5: a casting procedure: performing the process according to the casting temperature of 680-710 ℃, the casting speed of 45-55mm/min, the water pressure of 0.1-0.2Mpa and the water temperature of less than or equal to 30 ℃ to obtain a flat ingot meeting the internal control standard; step 6: a sawing procedure: the sawing length of the ingot casting gate part is 150 mm and 200 mm; and 7: a soaking process: carrying out ingot casting soaking treatment by adopting a process of 600-; and 8: a face milling procedure: the milling amount of the large surface of the cast ingot is 10-12mm per surface; and step 9: a compounding procedure: polishing the contact surface of the brazing layer and the core layer, cleaning two large surfaces of the core layer, stacking the two large surfaces in sequence, and bundling the two large surfaces by using a steel belt; step 10: a hot rolling procedure: rolling the 445mm thick ingot obtained by the steps into an aluminum coil with the thickness of 5-7mm through hot rolling, bonding and rolling, wherein the final rolling temperature of the hot rolling procedure is 300-340 ℃; step 11: a cold rolling procedure: cold rolling the coil obtained by the hot rolling by using a proper cold working rate until the thickness of the coil is 1.3-1.8 mm; step 12: annealing, namely performing roll annealing by adopting an annealing process of annealing the finished product at the metal temperature of 405 +/-3 ℃ for 1.5 hours, protecting by using nitrogen, and sending the aluminum roll with the preset thickness into the annealing furnace to perform finished product annealing; step 13: and a slitting process, namely using thick longitudinal shears to perform shearing, controlling the height of burrs within 50 mu m, and performing precise slitting to obtain a qualified composite aluminum strip, wherein the thickness of a brazing layer in the composite aluminum strip accounts for 4.5-7.5% of the total thickness, and the final delivery state of the material is in an O state.
The process flow using method comprises the following steps:
using the core alloy and the skin alloy, casting a flat ingot with the length of 5750mm, the width of 1340mm and the thickness of 445mm by using casting equipment in a casting workshop, detecting chemical components of the alloy, sawing and milling the ingot, wherein the size of the ingot after sawing and milling is 425 multiplied by 1340 multiplied by 5500mm, then putting the ingot into a heating furnace, heating at 475 ℃/8h, then hot rolling, rolling a brazing layer to the thickness of 30mm, only milling the surface of a core layer ingot, then binding the brazing layer and the core layer together by using a steel strip, carrying out hot rolling until the thickness is 6mm, then carrying out cold rolling, cold rolling until the thickness is 1.3mm, then annealing to an O state according to requirements, then slitting to obtain a composite aluminum coil with the thickness of 1.3 multiplied by 55mm, carrying out simulated brazing in a muffle furnace, wherein a stainless steel box with the space of 5 square decimeters is contained in the muffle furnace, the stainless steel box is filled with nitrogen, carrying out linear heating from room temperature to 600 ℃ within 45, the temperature was maintained for 3min, after which the muffle was taken out and cooled in air to room temperature, table 3 shows the results of the post-braze experiments.
TABLE 3 mechanical Properties after welding of alloy examples and comparative examples
Through the three embodiments, the material proportion in the second embodiment is the optimal scheme.
The invention has the beneficial effects that:
the high-strength high-ductility multilayer composite material has the advantages that the strength and ductility are improved, the thickness is reduced by 20 percent compared with that of a common pipe material, the weight reduction of a water tank is decisive, the material cost is saved for customers, the design purpose is achieved through batch production, meanwhile, the preparation method of the high-strength corrosion-resistant composite aluminum alloy material is characterized in that inner and outer layer alloy components which are matched with each other are selected, a core material ingot and a skin material ingot are prepared by adopting a semi-continuous casting method, the skin material ingot is a brazing layer, the skin material ingot is subjected to saw cutting, surface milling, heating, hot rolling and slicing to obtain a required skin material, then the required skin material is compounded with the core material ingot after surface milling, the compounded ingot is subjected to hot rolling, cold rolling, annealing and slitting to obtain a material which meets requirements, the material prepared by the method has higher strength and better ductility, and can be widely applied to the water tank of an automobile, the concrete advantages are as follows:
1. the high-strength high-ductility multilayer composite material for the water tank main board has the same excellent forming performance as that of the common 3003 aluminum alloy, has the strength more than 20% higher than that of the 3003 aluminum alloy, has the characteristic of good forming performance, and can be widely applied to the field of automobile water tanks.
2. According to the high-strength high-ductility multilayer composite material for the water tank main board, disclosed by the invention, the core layer alloy is uniform, and the size and distribution density of dispersed phase particles are controlled later, so that the product has high strength and high ductility.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments described above. All equivalent structures made by using the content of the specification of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.
Claims (8)
1. A high-strength high-ductility composite board material is characterized in that: the brazing layer is composed of A4045 aluminum alloy, the thickness ratio of the brazing layer to the whole material is 6 +/-1.5%, and the core layer is composed of 3003Mod aluminum alloy.
2. A high strength and high ductility composite plate material as claimed in claim 1, wherein: the brazing layer comprises the following materials: 9.0 to 11.0 percent of Si-, less than or equal to 0.3 percent of Fe-, less than or equal to 0.15 percent of Cu-, less than or equal to 0.05 percent of Mn-, less than or equal to 0.03 percent of Mg-, less than or equal to 0.1 percent of Zn-, and the balance of Al.
3. A high strength and high ductility composite plate material as claimed in claim 1, wherein: the core layer comprises the following materials: si-less than or equal to 0.2 percent, Fe-0.15-0.32 percent, Cu-0.5-0.8 percent, Mn-1.4-2.3 percent, Mg-less than or equal to 0.1 percent, Zn-less than or equal to 0.2 percent, Ti-less than or equal to 0.05 percent, Zr-0.05-0.2 percent and the balance of Al.
4. A processing technology of the high-strength high-ductility composite board material in the claim 1 comprises the following specific steps:
step 1: carrying out material component ratio of the brazing layer and the core layer;
step 2: a smelting process: the brazing layer 4045 is added with Si blocks at the melting temperature of 750-760 ℃, stirred for 20-30 minutes, and then added with aluminum ingots to be cooled to 740-750 ℃; refining and slagging off;
the core layer 3003Mod is smelted at the temperature of 760-780 ℃, Cu and Mn intermediate alloy is added, the mixture is stirred for 20-30 minutes, then aluminum ingots are added, the temperature is reduced to 750-760 ℃, and the mixture is refined and slag is removed;
and step 3: refining degassing: after the components of the alloy are qualified, refining by adopting argon for 20-25 minutes at the refining temperature of 750-760 ℃, and detecting that the hydrogen content of the liquid aluminum alloy is not higher than 0.15 ml/100 gAl;
and 4, step 4: a filtering process: filtering by adopting a 30PPi +40PPi double-stage ceramic filter plate;
and 5: a casting procedure: performing the process according to the casting temperature of 680-710 ℃, the casting speed of 45-55mm/min, the water pressure of 0.1-0.2Mpa and the water temperature of less than or equal to 30 ℃ to obtain a flat ingot meeting the internal control standard;
step 6: a sawing procedure: the sawing length of the ingot casting gate part is 150 mm and 200 mm;
and 7: a soaking process: carrying out ingot casting soaking treatment by adopting a process of 600-;
and 8: a face milling procedure: the milling amount of the large surface of the cast ingot is 10-12mm per surface;
and step 9: a compounding procedure: polishing the contact surface of the brazing layer and the core layer, cleaning two large surfaces of the core layer, stacking the two large surfaces in sequence, and bundling the two large surfaces by using a steel belt;
step 10: a hot rolling procedure: hot rolling, bonding and rolling the 445mm thick cast ingot obtained in the above steps to obtain an aluminum coil with the thickness of 5-7 mm;
step 11: a cold rolling procedure: cold rolling the coil obtained by the hot rolling by using a proper cold working rate until the thickness of the coil is 1.3-1.8 mm;
step 12: an annealing process;
step 13: and (5) cutting.
5. The processing technology of the high-strength high-ductility composite board according to claim 4, is characterized in that: the finishing temperature of the hot rolling process of the step 10 is 300 ℃ to 340 ℃.
6. The processing technology of the high-strength high-ductility composite board according to claim 4, is characterized in that: annealing step 12: and (3) carrying out roll annealing by adopting an annealing process of annealing the finished product at the metal temperature of 405 +/-3 ℃ for 1.5 hours, protecting by using nitrogen, and sending the aluminum roll with the preset thickness into the annealing furnace for annealing the finished product.
7. The processing technology of the high-strength high-ductility composite board according to claim 4, is characterized in that: and step 13, in the slitting process, thick longitudinal scissors are used for shearing, and the height of burrs is controlled within 50 microns.
8. The processing technology of the high-strength high-ductility composite board according to claim 7, is characterized in that: and (3) obtaining a qualified composite aluminum strip through precision slitting, wherein the thickness of a brazing layer in the composite aluminum strip accounts for 4.5-7.5% of the total thickness, and the final delivery state of the material is in an O state.
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Application publication date: 20201023 |