CN113319145B - Preparation method of steel/magnesium laminated composite plate strip - Google Patents
Preparation method of steel/magnesium laminated composite plate strip Download PDFInfo
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- CN113319145B CN113319145B CN202110519121.7A CN202110519121A CN113319145B CN 113319145 B CN113319145 B CN 113319145B CN 202110519121 A CN202110519121 A CN 202110519121A CN 113319145 B CN113319145 B CN 113319145B
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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
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Abstract
The invention discloses a preparation method of a steel/magnesium laminated composite plate strip, and belongs to the technical field of preparation of metal laminated composite materials. Firstly, softening and annealing steel and magnesium plate strip blanks, mechanically polishing the surfaces to be compounded, carrying out steel/magnesium lamination assembly, heating at 150-300 ℃, carrying out pre-rolling compounding to obtain steel/magnesium pre-composite plate strip, then carrying out stress relief annealing, mechanically polishing the surfaces to be compounded of the steel/magnesium pre-composite plate strip and the magnesium plate strip blank, carrying out (steel/magnesium)/magnesium lamination assembly, heating at 310-400 ℃, carrying out final rolling compounding to obtain steel/magnesium final composite plate strip, and finally carrying out diffusion annealing to obtain the steel/magnesium laminated composite plate strip. The technical scheme of the invention can realize high-strength metallurgical bonding between magnesium and steel, and is particularly suitable for preparing large-size heavy-coil-weight steel/magnesium laminated composite plate strips with a magnesium layer far thicker than a steel layer.
Description
Technical Field
The invention belongs to the technical field of metal layered composite material preparation, and particularly relates to a preparation method of a steel/magnesium layered composite plate strip, which is particularly suitable for preparing a steel/magnesium layered composite plate strip or a steel/magnesium/steel layered composite plate strip with large size and large coil weight and a thicker magnesium layer or a magnesium layer far thicker than a steel layer.
Background
The steel/magnesium (including steel/magnesium/steel) laminated composite plate strip has the advantages of low cost, excellent mechanical property and the like of steel and the advantages of low density, high damping property and the like of magnesium, is a novel structure-function integrated material with low cost, light weight, high strength and vibration reduction, and has wide application prospect in the fields of automobiles, ships, rail transit, aerospace, national defense war industry and the like. In the service process, the steel/magnesium laminated composite plate strip not only has high mechanical property and interface bonding strength, but also has a proper steel/magnesium layer thickness ratio (such as a magnesium layer is thicker or the magnesium layer is far thicker than the steel layer), so that the steel/magnesium laminated composite plate strip has the characteristics of light weight, high strength, high damping, vibration reduction and the like, and meets the special high-performance requirement of specific service conditions on the steel/magnesium laminated composite plate strip.
At present, the method for preparing the steel/magnesium laminated composite plate strip mainly comprises an explosive welding method and a hot rolling composite method.
The explosion welding method is to utilize the impact force generated by explosion of explosive to make the magnesium plate collide with the steel plate at high speed so as to realize metallurgical bonding between magnesium and steel. However, the explosive welding method has the problems of large energy consumption, serious environmental pollution, complex process, low production efficiency, high product cost and the like, and can not continuously produce large-size and heavy-coil-weight steel/magnesium laminated composite plate strips.
By way of analysis, the applicant has found that the prior art mainly comprises the following solutions:
1. plating zinc and/or aluminum layers on the surfaces to be bonded of the magnesium plate and/or the steel plate → assembling → heating under the condition of vacuum or inert gas atmosphere → hot rolling and compounding → the magnesium-steel composite plate. The method realizes indirect metallurgical bonding of the magnesium/steel interface of the metal difficult to be mutually dissolved by adding the aluminum or zinc of the intermediate metal layer. However, both aluminum and zinc can react with iron and magnesium to form intermetallic compounds, resulting in a low interfacial bond strength of the composite panel. In addition, the method has the following disadvantages: (1) the magnesium/steel combined blank needs to be heated under the vacuum or inert gas atmosphere condition, the preparation process is long, the requirement on equipment is high, and the production cost of the composite plate is improved; (2) the size of the vacuum heat treatment equipment limits the width and the length of the composite plate, continuous production in the true sense is difficult to realize, and a steel/magnesium laminated composite plate strip with large size and large coil weight and a thicker magnesium layer (or the magnesium layer is much thicker than the steel layer) cannot be prepared.
2. Mechanically polishing the surface to be compounded of the magnesium plate and the steel plate → assembling → packaging in vacuum in a sheath → hot rolling and compounding → diffusion heat treatment → the magnesium/steel laminated composite plate. The method realizes the direct metallurgical bonding of the steel/magnesium interface by utilizing a new defect-atom diffusion mechanism without adding an intermediate layer. However, this method requires vacuum packaging of the assembly with a metal sheath before hot roll lamination, which makes it difficult to produce a steel/magnesium laminated composite sheet strip having a thick magnesium layer (or a magnesium layer much thicker than the steel layer) with a large coil weight and a limited width and length.
Therefore, in view of the above problems of the current method for manufacturing a steel/magnesium laminated composite plate strip, there is a need to develop a new method for manufacturing a steel/magnesium laminated composite plate strip with a thicker magnesium layer (or a magnesium layer much thicker than the steel layer) with low cost and high efficiency, and large coil weight.
Disclosure of Invention
The invention aims to provide a preparation method of a steel/magnesium laminated composite plate strip, which is characterized in that a process of combining pre-rolling compounding and final rolling compounding at a lower temperature below a recrystallization temperature is adopted, high-strength metallurgical bonding between steel and magnesium is realized without vacuum, reducing atmosphere or protective atmosphere, and the steel/magnesium laminated composite plate strip is prepared at low cost and high efficiency, and is particularly suitable for preparing the steel/magnesium laminated composite plate strip with large size and large coil weight and a thicker magnesium layer (or the magnesium layer is far thicker than the steel layer).
The preparation method of the steel/magnesium laminated composite plate strip comprises the following steps:
step 1: respectively carrying out softening annealing on the steel plate strip blank and the magnesium plate strip blank in an air atmosphere;
step 2: respectively mechanically polishing the surfaces to be compounded of the steel plate strip blank and the magnesium plate strip blank, wherein the direction of a polishing stripe formed is vertical to the length direction of the steel plate strip blank and the magnesium plate strip blank, then stacking and assembling the steel/magnesium strip blank according to the sequence of steel/magnesium to form a steel/magnesium layered blank, heating the steel/magnesium layered blank in the air atmosphere, wherein the heating temperature is 150-300 ℃, the heat preservation time is 0.05-30 min, then performing pre-rolling compounding on the heated steel/magnesium layered blank to obtain a steel/magnesium pre-compounded plate strip, and the pre-rolling compounding reduction rate is 10-50%;
and step 3: performing stress relief annealing on the steel/magnesium pre-clad plate strip in an air atmosphere;
and 4, step 4: respectively mechanically polishing the magnesium surface of the steel/magnesium pre-composite plate strip and the surface to be composited of the magnesium plate strip blank, wherein the direction of a polishing stripe formed is vertical to the length direction of the steel/magnesium pre-composite plate strip and the magnesium plate strip blank, then stacking and assembling the (steel/magnesium)/magnesium layers according to the sequence of (steel/magnesium)/magnesium to form a (steel/magnesium)/magnesium layer-shaped blank, then heating the (steel/magnesium)/magnesium layer-shaped blank in an air atmosphere, wherein the heating temperature is 310-400 ℃, the heat preservation time is 0.05-30 min, then performing final rolling and compositing on the heated (steel/magnesium)/magnesium layer-shaped blank to obtain a steel/magnesium final composite plate strip, and the final rolling composite reduction rate is 10-50%;
and 5: and carrying out diffusion annealing on the steel/magnesium final composite plate strip in an air atmosphere.
Further, the steel strip includes, but is not limited to, at least one of a carbon steel strip, a stainless steel strip, a heat resistant steel strip, or an alloy steel strip, the magnesium strip includes, but is not limited to, at least one of a pure magnesium strip or a magnesium alloy strip, and the magnesium alloy strip includes, but is not limited to, at least one of an AZ31 magnesium alloy strip, an AZ91 magnesium alloy strip, a ZK60 magnesium alloy strip, or a WE43 magnesium alloy strip.
Further, the steel strip and the magnesium strip are simultaneously in a single sheet form or in a coil form.
Further, the mechanical polishing is off-line mechanical polishing or on-line mechanical polishing, including but not limited to at least one of belt polishing, grinding wheel polishing, wire brush polishing, louver polishing or laser polishing.
Further, the lamination assembly is an off-line lamination assembly or an on-line lamination assembly.
Further, the annealing is off-line annealing or on-line annealing, and is performed in vacuum, a reducing atmosphere or a protective atmosphere.
Further, the heating is off-line heating or on-line heating, and is performed in vacuum, a reducing atmosphere or a protective atmosphere.
Further, the steel/magnesium laminated composite plate strip is a steel/magnesium laminated composite plate strip or a steel/magnesium/steel laminated composite plate strip with 2-10 layers, wherein the thickness of the magnesium layer is 0.1-100 mm.
Further, in the step 1, the softening annealing system of the steel plate strip blank is furnace cooling after heat preservation for 1-3 h at 880-910 ℃, and the softening annealing system of the magnesium plate strip blank is furnace cooling after heat preservation for 3-5 h at 300-400 ℃, so that the hardness matching requirement during rolling is met.
Furthermore, in the step 3, the stress relief annealing system is to perform heat preservation at 300-480 ℃ for 3-5 hours and then perform air cooling.
Further, in the step 5, the diffusion annealing system is to carry out heat preservation for 1-10 hours at 300-500 ℃ and then furnace cooling to obtain the steel/magnesium laminated composite plate strip.
The main advantages of the invention are:
(1) by adopting the method, the steel/magnesium interface can generate accumulated deformation, mutual diffusion of Mg-Fe atoms of the metal which is difficult to be mutually dissolved in the steel/magnesium interface layer is promoted, interface metallurgical bonding is realized, and high interface bonding strength is obtained.
(2) By adopting the method, the thickness of the magnesium layer can be adjusted during final rolling and compounding, and the steel/magnesium laminated composite plate strip with different steel/magnesium layer thickness ratios (such as the magnesium layer is thicker or the magnesium layer is far thicker than the steel layer) can be prepared.
(3) By adopting the method, pre-rolling compounding is carried out after heating at a lower temperature of 150-300 ℃ below the recrystallization temperature for a short time, so that pre-compounding of the steel plate strip blank and the thinner magnesium plate strip blank is realized, and the problem that pre-compounding is difficult to realize due to severe oxidation of the surfaces to be compounded of the steel plate strip blank and the magnesium plate strip blank caused by long-time heating at a high temperature in the traditional air atmosphere is solved; and then heating for a short time at a lower temperature of 310-400 ℃ below the recrystallization temperature, and performing final rolling compounding, wherein the final compounding is realized by the interface metallurgical bonding of similar metals between a thinner magnesium layer and a thicker magnesium plate strip blank on the steel/magnesium pre-compounded plate strip in the rolling deformation process, so that the rolling force required by rolling compounding can be reduced, the requirement on a rolling mill is reduced, the interface bonding performance seriously influenced by the oxidation of the surface to be compounded of magnesium caused by long-time heating at a high temperature in the traditional air atmosphere is avoided, and the edge crack of the magnesium layer in the rolling process is reduced or eliminated.
(4) When the method is adopted to prepare the steel/magnesium laminated composite plate strip, vacuum, reducing atmosphere or protective atmosphere is not needed, the operation is convenient, the requirement on equipment is not high, the production efficiency is high, the product cost is low, and the method is particularly suitable for continuously preparing the steel/magnesium laminated composite plate strip or the steel/magnesium/steel laminated composite plate strip which has large size and large coil weight, has thicker magnesium layer (or the magnesium layer is far thicker than the steel layer), and has two or more layers.
Drawings
FIG. 1 is a schematic diagram of a continuous pre-rolling composite process for manufacturing a coiled steel/magnesium pre-composite plate strip. Wherein, 1 is an uncoiling device, 2 is an online polishing device, 3 is a magnesium plate strip blank, 4 is a steel plate strip blank, 5 is an online assembly device, 6 is an online heating device, 7 is a rolling mill, 8 is a coiling device, and 9 is a steel/magnesium pre-composite plate strip.
FIG. 2 is a schematic view of a continuous preparation and final rolling composite process of a steel/magnesium/steel final composite plate strip in a coiled form. Wherein, 1 is an uncoiling device, 2 is an online grinding device, 3 is a magnesium plate strip blank, 5 is an online assembly device, 6 is an online heating device, 7 is a rolling mill, 8 is a coiling device, 9 is a steel/magnesium pre-composite plate strip, and 10 is a steel/magnesium/steel final composite plate strip.
FIG. 3 is a cross-sectional view of a 20# steel/AZ 31 magnesium alloy/20 # steel laminated composite plate strip with a layer thickness combination of 0.5/1.2/0.6mm prepared by the method of example 1 of the invention.
Detailed Description
The present invention is described in detail with reference to the following examples, which are intended to be illustrative only and should not be construed as limiting the scope of the invention, and that the invention will be susceptible to insubstantial modifications and variations within the spirit of the invention.
The invention discloses a preparation method of a steel/magnesium laminated composite plate strip, which has the advantages that the high-strength metallurgical bonding between magnesium and steel can be realized by adopting a process of combining pre-rolling compounding and final rolling compounding at a lower temperature below the recrystallization temperature without vacuum, reducing atmosphere or protective atmosphere, and the method is particularly suitable for preparing the steel/magnesium laminated composite plate strip with large size, large coil weight and a magnesium layer far thicker than a steel layer.
With reference to the accompanying drawings, fig. 1 is a schematic diagram of a continuous pre-rolling composite process for preparing a coiled steel/magnesium pre-composite plate strip; FIG. 2 is a schematic view of a continuous preparation and final rolling composite process of a steel/magnesium/steel final composite plate strip in a coiled form. Wherein, 1 is an uncoiling device, 2 is an online grinding device, 3 is a magnesium plate strip blank, 4 is a steel plate strip blank, 5 is an online assembly device, 6 is an online heating device, 7 is a rolling mill, 8 is a coiling device, 9 is a steel/magnesium pre-composite plate strip, and 10 is a steel/magnesium/steel final composite plate strip.
Example 1:
a20 # steel/AZ 31 magnesium alloy/20 # steel laminated composite plate strip is prepared by taking a single-sheet 20# steel plate strip with the thickness of 1mm and a single-sheet AZ31 magnesium alloy plate strip with the thickness of 1mm as raw materials.
Respectively carrying out softening annealing treatment on the 20# steel plate strip blank and the AZ31 magnesium alloy plate strip blank, wherein the softening annealing system of the 20# steel plate strip blank is that furnace cooling is carried out at the temperature of 910 ℃ for 1h, and the softening annealing system of the AZ31 magnesium alloy plate strip blank is that furnace cooling is carried out at the temperature of 350 ℃ for 5 h;
respectively carrying out off-line mechanical grinding on the surfaces to be compounded of the 20# steel plate strip blank and the AZ31 magnesium alloy plate strip blank by using an angle grinder with louver blades, removing pollutants and an oxide layer on the surfaces to be compounded to obtain a clean and rough surface to be compounded, wherein the direction of grinding stripes formed by mechanical grinding is vertical to the length direction of the 20# steel plate strip blank and the AZ31 magnesium alloy plate strip blank;
stacking and assembling the mechanically polished 20# steel plate strip blank and the AZ31 magnesium alloy plate strip blank according to the sequence of steel/magnesium to obtain a 20# steel/AZ 31 magnesium alloy layered blank;
heating the 20# steel/AZ 31 magnesium alloy laminar blank in an air atmosphere, wherein the heating temperature is 150 ℃, and the heat preservation time is 10min, and then pre-rolling and compounding the heated 20# steel/AZ 31 magnesium alloy laminar blank, wherein the pre-rolling and compounding reduction rate is 30%, so as to obtain a 20# steel/AZ 31 magnesium alloy pre-compounded plate strip;
carrying out stress relief annealing on the 20# steel/AZ 31 magnesium alloy pre-clad plate strip in an air atmosphere, wherein the stress relief annealing system is air cooling after heat preservation at 400 ℃ for 3 h;
respectively carrying out off-line mechanical grinding on the surfaces to be compounded of 2 pieces of 20# steel/AZ 31 magnesium alloy pre-compounded plate strip and 1 piece of AZ31 magnesium alloy plate strip blank, wherein the direction of the formed grinding stripe is vertical to the length direction of the 20# steel/AZ 31 magnesium alloy pre-compounded plate strip and the AZ31 magnesium alloy plate strip blank, and then stacking and assembling the blanks according to the sequence of (steel/magnesium)/magnesium/(magnesium/steel) to obtain a (20# steel/AZ 31 magnesium alloy)/AZ 31 magnesium alloy/(AZ 31 magnesium alloy/20 # steel) layered blank;
heating the (20# steel/AZ 31 magnesium alloy)/AZ 31 magnesium alloy/(AZ 31 magnesium alloy/20 # steel) laminated blank in an air atmosphere, wherein the heating temperature is 350 ℃, and the heat preservation time is 10min, and then performing final rolling compounding on the heated (20# steel/AZ 31 magnesium alloy)/AZ 31 magnesium alloy/(AZ 31 magnesium alloy/20 # steel) laminated blank, wherein the final rolling compounding reduction rate is 39.5%, so as to obtain a 20# steel/AZ 31 magnesium alloy/20 # steel final composite plate strip;
and (3) carrying out diffusion annealing on the final 20# steel/AZ 31 magnesium alloy/20 # steel composite plate strip in an air atmosphere, wherein the diffusion annealing system is to carry out heat preservation for 3 hours at 350 ℃ and then carry out furnace cooling to obtain the laminated 20# steel/AZ 31 magnesium alloy/20 # steel composite plate strip with the layer thickness combination of 0.5/1.2/0.6 mm. The cross-sectional shape of the 20# steel/AZ 31 magnesium alloy/20 # steel laminated composite plate strip with the layer thickness combination of 0.5/1.2/0.6mm is shown in FIG. 3.
Example 2:
a20 # steel/pure magnesium laminated composite plate strip is prepared by taking a 20# steel plate strip with the thickness of 2mm in a single-sheet mode and a pure magnesium plate strip with the thickness of 2mm and 10mm in a single-sheet mode as raw materials.
Respectively carrying out softening annealing treatment on the 20# steel plate strip blank and the pure magnesium plate strip blank, wherein the softening annealing system of the 20# steel plate strip blank is to carry out heat preservation for 2h of furnace cooling at 900 ℃, and the softening annealing system of the pure magnesium plate strip blank is to carry out heat preservation for 4h of furnace cooling at 360 ℃;
respectively carrying out off-line mechanical polishing on the surfaces to be compounded of the 20# steel plate strip blank and the pure magnesium plate strip blank with the thickness of 2mm by using an angle grinder with a grinding wheel, removing pollutants and an oxide layer on the surface to be compounded to obtain a clean and rough surface to be compounded, wherein the direction of polishing stripes formed by mechanical polishing is vertical to the length direction of the 20# steel plate strip blank and the pure magnesium plate strip blank;
stacking and assembling the mechanically polished 20# steel plate strip blank and the pure magnesium plate strip blank according to the steel/magnesium sequence to obtain a 20# steel/pure magnesium layered blank;
heating the 20# steel/pure magnesium layered blank in an air atmosphere, wherein the heating temperature is 300 ℃, and the heat preservation time is 5min, then performing pre-rolling compounding on the heated 20# steel/pure magnesium layered blank, wherein the pre-rolling compounding reduction rate is 40%, and obtaining a 20# steel/pure magnesium pre-compounded plate strip;
carrying out stress relief annealing on the 20# steel/pure magnesium pre-clad plate strip in an air atmosphere, wherein the stress relief annealing system is air cooling after heat preservation at 380 ℃ for 4 h;
respectively mechanically polishing the pure magnesium surface of 1 piece of 20# steel/pure magnesium pre-composite plate strip and the surface to be composited of 1 piece of pure magnesium plate strip blank with the thickness of 10mm, wherein the direction of the formed polishing stripe is vertical to the length direction of the 20# steel/pure magnesium pre-composite plate strip and the pure magnesium plate strip blank, and then stacking and assembling the blank according to the sequence of (steel/magnesium)/magnesium to obtain a (20# steel/pure magnesium)/pure magnesium layered blank;
heating the (20# steel/pure magnesium)/pure magnesium layered blank in an air atmosphere, keeping the heating temperature at 380 ℃ for 10min, and then performing final rolling compounding on the heated (20# steel/pure magnesium)/pure magnesium layered blank, wherein the final rolling compounding reduction rate is 40%, so as to obtain a 20# steel/pure magnesium final composite plate strip;
and (3) carrying out diffusion annealing on the 20# steel/pure magnesium final composite plate strip in an air atmosphere, wherein the diffusion annealing system is to carry out furnace cooling after heat preservation for 2h at 450 ℃ to obtain the 20# steel/pure magnesium laminated composite plate strip with the layer thickness combination of 0.8/7.38 mm.
Example 3:
the rolled Q235 steel plate strip with the thickness of 1mm and the rolled ZK60 magnesium alloy plate strip with the thickness of 1mm and 2mm respectively are taken as raw materials to continuously prepare the rolled Q235 steel/ZK 60 magnesium alloy/Q235 steel laminated composite plate strip.
Softening and annealing the coiled Q235 steel plate strip blank and the ZK60 magnesium alloy plate strip blank respectively, wherein the softening and annealing schedule of the No. 20 steel plate strip blank is 890 ℃, 2 hours of furnace cooling is carried out, and the softening and annealing schedule of the ZK60 magnesium alloy plate strip blank is 370 ℃, 5 hours of furnace cooling is carried out;
respectively uncoiling a coiled Q235 steel plate strip blank with the thickness of 1mm and a coiled ZK60 magnesium alloy plate strip blank with the thickness of 1mm by using uncoiling equipment 1, respectively and mechanically grinding to-be-compounded surfaces of the ZK60 magnesium alloy plate strip blank and the Q235 steel plate strip blank by using online grinding equipment 2 with louver blades on line to remove pollutants and an oxide layer on the to-be-compounded surfaces to obtain clean and rough to-be-compounded surfaces, wherein the direction of grinding stripes formed by mechanical grinding is vertical to the length direction of the Q235 steel plate strip blank and the ZK60 magnesium alloy plate strip blank;
stacking and assembling the mechanically-polished ZK60 magnesium alloy plate strip blank and the Q235 steel plate strip blank according to the steel/magnesium sequence by using an online assembly device 5 to obtain a Q235 steel/ZK 60 magnesium alloy layered blank;
heating the Q235 steel/ZK 60 magnesium alloy layered blank in an air atmosphere by using an online heating device 6, wherein the heating temperature is 300 ℃, the heat preservation time is 0.05min, then entering a rolling mill 7 for pre-rolling compounding, the pre-rolling compounding reduction rate is 35%, and obtaining a rolled Q235 steel/ZK 60 magnesium alloy pre-compounded plate strip by using a rolling device 8;
performing stress relief annealing on the coiled Q235 steel/ZK 60 magnesium alloy pre-composite plate strip in an air atmosphere, wherein the stress relief annealing system is that the strip is subjected to heat preservation at 450 ℃ for 1 hour and then is cooled in air;
respectively uncoiling a Q235 steel/ZK 60 magnesium alloy pre-composite plate strip material in a coiling form by utilizing an uncoiling device 1 and a ZK60 magnesium alloy plate strip blank in a coiling form with the thickness of 2mm in a coiling form by utilizing a coiling device 1, respectively carrying out online mechanical grinding on the surfaces to be compounded of the Q235 steel/ZK 60 magnesium alloy pre-composite plate strip material and the ZK60 magnesium alloy plate strip blank by utilizing an online grinding device 2 with louver blades, wherein the direction of the formed grinding stripe is vertical to the length direction of the Q235 steel/ZK 60 magnesium alloy pre-composite plate strip material and the ZK60 magnesium alloy plate strip blank, then, stacking and assembling the Q235 steel/ZK 60 magnesium alloy pre-composite plate strip and the ZK60 magnesium alloy plate strip by using an online assembly device 5 according to the sequence of (steel/magnesium)/magnesium/(magnesium/steel) to obtain a (Q235 steel/ZK 60 magnesium alloy)/ZK 60 magnesium alloy/(ZK 60 magnesium alloy/Q235 steel) layered blank;
then, heating the (Q235 steel/ZK 60 magnesium alloy)/ZK 60 magnesium alloy/(ZK 60 magnesium alloy/Q235 steel) laminated blank in an air atmosphere by using an online heating device 6, wherein the heating temperature is 400 ℃, the heat preservation time is 0.05min, then, feeding the blank into a rolling mill 7 for final rolling compounding, the final rolling compounding reduction rate is 40%, and obtaining a coiled Q235 steel/ZK 60 magnesium alloy/Q235 steel final composite plate strip by using a coiling device 8;
and (3) performing diffusion annealing on the coiled Q235 steel/ZK 60 magnesium alloy/Q235 steel final composite plate strip in the air atmosphere, wherein the diffusion annealing system is to perform furnace cooling after heat preservation at 400 ℃ for 3h to obtain the coiled Q235 steel/ZK 60 magnesium alloy/Q235 steel layered composite plate strip with the layer thickness combination of 0.5/1.76/0.5 mm.
Example 4:
a304 stainless steel/AZ 91 magnesium alloy/304 stainless steel laminated composite plate strip material in a coiled form is continuously prepared by taking a 304 stainless steel plate strip material in a coiled form with the width of 600mm and the thickness of 0.5mm and an AZ91 magnesium alloy plate strip material in a coiled form with the width of 600mm and the thickness of 0.5mm and 1mm respectively as raw materials.
Respectively carrying out softening annealing treatment on a coiled 304 stainless steel plate strip blank and a coiled AZ91 magnesium alloy plate strip blank, wherein the softening annealing system of the 304 stainless steel plate strip blank is that furnace cooling is carried out at 900 ℃ for 1h, and the softening annealing system of the AZ91 magnesium alloy plate strip blank is that furnace cooling is carried out at 390 ℃ for 4 h;
uncoiling a coiled 304 stainless steel plate strip blank with the thickness of 0.5mm and a coiled AZ91 magnesium alloy plate strip blank with the thickness of 0.5mm by utilizing uncoiling equipment 1, and performing online mechanical polishing on the surfaces to be compounded of the AZ91 magnesium alloy plate strip blank and the 304 stainless steel plate strip blank by utilizing online polishing equipment 2 provided with a grinding wheel to remove pollutants and an oxide layer on the surface to be compounded to obtain a clean and rough surface to be compounded, wherein the direction of polishing stripes formed by mechanical polishing is vertical to the length directions of the 304 stainless steel plate strip blank and the AZ91 magnesium alloy plate strip blank;
stacking and assembling the mechanically polished AZ91 magnesium alloy plate strip blank and 304 stainless steel plate strip blank according to the steel/magnesium sequence by using online assembly equipment 5 to obtain 304 stainless steel/AZ 91 magnesium alloy layered blank;
heating the 304 stainless steel/AZ 91 magnesium alloy laminar blank in an air atmosphere by using an online heating device 6, wherein the heating temperature is 300 ℃, the heat preservation time is 0.05min, then entering a rolling mill 7 for pre-rolling compounding, the pre-rolling compounding reduction rate is 40%, and obtaining a coiled 304 stainless steel/AZ 91 magnesium alloy pre-compounded plate strip by using a coiling device 8;
carrying out stress relief annealing on the coiled 304 stainless steel/AZ 91 magnesium alloy pre-clad plate strip in an air atmosphere, wherein the stress relief annealing system is that the strip is subjected to heat preservation at 400 ℃ for 1h and then is cooled in air;
respectively uncoiling a 304 stainless steel/AZ 91 magnesium alloy pre-composite plate strip material in a coiled form by using uncoiling equipment 1 and an AZ91 magnesium alloy plate strip blank in a coiled form with the thickness of 1mm in a coiled form by using 2, respectively carrying out online mechanical grinding on to-be-compounded surfaces of the 304 stainless steel/AZ 91 magnesium alloy pre-composite plate strip material and the AZ91 magnesium alloy plate strip blank by using online grinding equipment 2 provided with a grinding wheel, wherein the direction of the formed grinding stripes is vertical to the length direction of the 304 stainless steel/AZ 91 magnesium alloy pre-composite plate strip material and the AZ91 magnesium alloy plate strip blank, then, stacking and assembling the 304 stainless steel/AZ 91 magnesium alloy pre-composite plate strip and the AZ91 magnesium alloy plate strip by using an online assembly device 5 according to the sequence of (steel/magnesium)/magnesium/(magnesium/steel) to obtain a (304 stainless steel/AZ 91 magnesium alloy)/AZ 91 magnesium alloy/(AZ 91 magnesium alloy/304 stainless steel) layered blank;
heating the (304 stainless steel/AZ 91 magnesium alloy)/AZ 91 magnesium alloy/(AZ 91 magnesium alloy/304 stainless steel) laminated blank in an air atmosphere by using an online heating device 6, wherein the heating temperature is 400 ℃, the heat preservation time is 0.05min, then entering a rolling mill 7 for final rolling compounding, the final rolling compounding reduction rate is 40%, and obtaining a coiled 304 stainless steel/AZ 91 magnesium alloy/304 stainless steel final composite plate strip by using a coiling device 8;
and (3) performing diffusion annealing on the coiled 304 stainless steel/AZ 91 magnesium alloy/304 stainless steel final composite plate strip in the air atmosphere, wherein the diffusion annealing system is that the temperature is kept at 300 ℃ for 4h, and then the plate is cooled in a furnace to obtain the coiled 304 stainless steel/AZ 91 magnesium alloy/304 stainless steel laminated composite plate strip with the layer thickness combination of 0.3/0.72/0.3mm and the width of 600 mm.
Claims (10)
1. A preparation method of a steel/magnesium laminated composite plate strip is characterized by comprising the following steps:
step 1: respectively carrying out softening annealing on the steel plate strip blank and the magnesium plate strip blank in an air atmosphere;
step 2: respectively mechanically polishing the surfaces to be compounded of the steel plate strip blank and the magnesium plate strip blank, wherein the direction of a polishing stripe formed is vertical to the length direction of the steel plate strip blank and the magnesium plate strip blank, then stacking and assembling the steel/magnesium strip blank according to the sequence of steel/magnesium to form a steel/magnesium layered blank, heating the steel/magnesium layered blank in an air atmosphere, wherein the heating temperature is lower than the recrystallization temperature and is 150-300 ℃, the heat preservation time is 0.05-30 min, then pre-rolling and compounding the heated steel/magnesium layered blank to obtain a steel/magnesium pre-compounded plate strip, and the pre-rolling compound reduction rate is 10-50%;
and step 3: performing stress relief annealing on the steel/magnesium pre-clad plate strip in an air atmosphere;
and 4, step 4: respectively mechanically polishing the magnesium surface of the steel/magnesium pre-composite plate strip and the surface to be composited of the magnesium plate strip blank, wherein the direction of a polishing stripe formed is vertical to the length direction of the steel/magnesium pre-composite plate strip and the magnesium plate strip blank, then stacking and assembling the steel/magnesium in sequence to form a steel/magnesium layered blank, then heating the steel/magnesium layered blank in an air atmosphere, wherein the heating temperature is lower than the recrystallization temperature and is 310-400 ℃, the heat preservation time is 0.05-30 min, then performing final rolling and compositing on the heated steel/magnesium layered blank to obtain a steel/magnesium final composite plate strip, and the final rolling composite reduction rate is 10-50%;
and 5: and carrying out diffusion annealing on the steel/magnesium final composite plate strip in an air atmosphere.
2. The method of claim 1, wherein the steel strip includes but is not limited to at least one of a carbon steel strip, a stainless steel strip, a heat resistant steel strip, or an alloy steel strip, wherein the magnesium strip includes but is not limited to at least one of a pure magnesium strip or a magnesium alloy strip, and wherein the magnesium alloy strip includes but is not limited to at least one of an AZ31 magnesium alloy strip, an AZ91 magnesium alloy strip, a ZK60 magnesium alloy strip, or a WE43 magnesium alloy strip.
3. The method of claim 1, wherein the steel plate strip and the magnesium plate strip are simultaneously in a single sheet form or in a roll form.
4. The method of claim 1, wherein the mechanical grinding is off-line mechanical grinding or on-line mechanical grinding, including but not limited to at least one of belt grinding, wheel grinding, wire brush grinding, louver grinding or laser grinding.
5. The method of making a steel/magnesium laminated composite plate strip of claim 1, wherein said lamination stack is an off-line lamination stack or an on-line lamination stack.
6. The method of claim 1, wherein the heating is off-line heating or in-line heating, and the annealing is off-line annealing or in-line annealing, and is performed in a vacuum, a reducing atmosphere, or a protective atmosphere.
7. The method of claim 1, wherein the steel/magnesium laminated composite strip is 2-10 layers of steel/magnesium laminated composite strip or steel/magnesium/steel laminated composite strip, wherein the thickness of the magnesium layer is 0.1-100 mm.
8. The method for preparing the steel/magnesium laminated composite plate strip as claimed in claim 1, wherein in the step 1, the softening annealing schedule of the steel plate strip blank is that the steel plate strip blank is subjected to furnace cooling after being kept at 880-910 ℃ for 1-3 h, and the softening annealing schedule of the magnesium plate strip blank is that the steel plate strip blank is subjected to furnace cooling after being kept at 300-400 ℃ for 3-5 h, so that the hardness matching requirement during rolling is met.
9. The method for preparing a steel/magnesium laminated composite plate strip according to claim 1, wherein in the step 3, the stress relief annealing process is performed after heat preservation at 300-480 ℃ for 3-5 hours and air cooling.
10. The method for preparing the steel/magnesium laminated composite plate strip according to claim 1, wherein in the step 5, the diffusion annealing process is performed for 1 to 10 hours at 300 to 500 ℃ and then furnace cooling is performed to obtain the steel/magnesium laminated composite plate strip.
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