CN115026139A - Method for preparing nickel-magnesium composite board by rolling - Google Patents
Method for preparing nickel-magnesium composite board by rolling Download PDFInfo
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- CN115026139A CN115026139A CN202210955429.0A CN202210955429A CN115026139A CN 115026139 A CN115026139 A CN 115026139A CN 202210955429 A CN202210955429 A CN 202210955429A CN 115026139 A CN115026139 A CN 115026139A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
- B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
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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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- B21B2001/386—Plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
Abstract
The invention relates to a method for preparing a nickel-magnesium composite board by rolling, belongs to the technical field of composite material preparation, solves the technical problem of compounding a magnesium alloy plate and a nickel alloy plate, and adopts the following solution: the method comprises the steps of carrying out surface laser cleaning on a magnesium alloy plate and a nickel alloy plate, preparing micro textures on to-be-compounded interfaces of the magnesium alloy plate and the nickel alloy plate by controlling laser parameters, carrying out symmetrical assembly according to the sequence of the nickel alloy plate, the magnesium alloy plate, a steel strip, the magnesium alloy plate and the nickel alloy plate, carrying out hot rolling compounding and annealing treatment, cutting a sealing welding position of an annealed rolling composite blank, removing a steel strip layer, and obtaining two nickel-magnesium composite plates.
Description
Technical Field
The invention belongs to the technical field of composite material preparation, and particularly relates to a method for preparing a nickel-magnesium composite plate by rolling.
Background
The inherent defects of low plastic deformation capability, strong surface notch sensitivity, poor corrosion resistance and the like of the magnesium alloy make the application of the magnesium alloy relatively limited compared with a plurality of metal materials. At present, methods for improving the corrosion of the surface of the magnesium alloy include electroplating, chemical plating, thermal spraying and the like to add a metal coating to the magnesium alloy and improve the corrosion of a magnesium alloy matrix. The operation is complex, the coating is thin, the bonding strength of the coating and the magnesium matrix is low, and the mechanical property of the magnesium alloy matrix is not improved.
The nickel-based alloy is a high alloy steel which can resist corrosion of acid, alkali, salt and solution thereof and other corrosive mediums, and is one of the most widely used metals in industrial production. The nickel-based alloy has excellent corrosion resistance, mechanical strength, high-temperature oxidation resistance, toughness and weldability. In view of the characteristics of high plasticity and corrosion resistance of the nickel-based alloy, if the magnesium alloy and the nickel-based alloy are combined to prepare the composite plate, the surface corrosion resistance of the magnesium alloy material can be improved, the comprehensive mechanical property of the magnesium alloy matrix can be improved, and the service requirement of the material can be met. The method is an effective way for widening the application of the magnesium alloy material and has important practical significance.
At present, the processing method for preparing the layered metal composite material is an explosive welding method and rolling composite.
The explosion welding method is to utilize the impact force produced by explosion of explosive to make the nickel alloy plate and the magnesium alloy plate collide at high speed to realize metallurgical bonding between nickel and magnesium, and the interface is wavy bonding with high bonding strength. 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 large-coil-weight laminated composite materials.
At present, the rolling method for preparing the metal laminated composite material has become a trend, and because the material properties (deformation resistance, plasticity, thermal conductivity, melting point and the like) of nickel and magnesium are greatly different, two problems mainly exist in the preparation process: firstly, the deformation of the rolled nickel and magnesium blanks is extremely inconsistent, and secondly, the interface of the composite plate is in straight combination, the combination strength is low, and the interface is easy to layer.
The waveform bonding interface and the straight interface are the conventional bonding interface of the metal laminated composite material, and the waveform bonding interface is the specific interface of the explosive welding composite plate, because the waveform interface is favorable for expanding the metallurgical bonding area of the dissimilar materials and simultaneously forms the mechanical interlocking effect, the bonding strength of the interfaces can be increased. The composite board prepared by the rolling method is generally a straight bonding interface, the strength is lower than that of a wave-shaped interface, and interface layering often occurs in processing such as later bending and rolling. If the wave-shaped interface can be prepared by using a rolling method, the interface bonding strength of the composite material is enhanced, and the later reprocessing and manufacturing of the rolled composite material are facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the background art and provides a method for preparing a nickel-magnesium composite plate by rolling.
The invention is realized by adopting the following technical scheme:
a method for preparing a nickel-magnesium composite plate by rolling comprises the following steps:
s1, selecting two magnesium alloy plates, two nickel alloy plates and a steel strip with the same width and length dimensions as required, and respectively annealing and toughening the magnesium alloy plates, the nickel alloy plates and the steel strip:
the annealing and toughening treatment temperature of the magnesium alloy plate is 350-400 ℃, and the heat preservation time is 120-180 min;
the annealing and toughening treatment temperature of the nickel alloy plate is 650-750 ℃, and the heat preservation time is 120-180 min;
the annealing and toughening treatment temperature of the steel strip is 700-850 ℃, and the heat preservation time is 60-120 min;
s2, respectively treating the surfaces to be compounded of the nickel alloy plate and the magnesium alloy plate by utilizing laser cleaning to expose fresh metal, and preparing microtextures parallel to the width direction of the plate on the surfaces to be compounded of the nickel alloy plate and the magnesium alloy plate by controlling laser cleaning parameters; then, sequentially polishing by using an angle grinder, polishing by using sand paper, wiping by using acetone and drying by air, removing rust layers and oxide layers on the non-laser cleaning surface of the magnesium alloy plate and the surfaces on the two sides of the steel strip, and coating a blocking agent on the mechanical polishing surface, so that the rolled steel strip and the magnesium alloy plate can be conveniently separated;
wherein:
the laser power of the magnesium alloy plate to be subjected to laser cleaning on the composite surface is 50W-100W, the scanning speed is 2000 mm/s-3000 mm/s, the scanning line width of a laser beam is 20 mm-35 mm, and the depth of a microtexture on the magnesium alloy plate is 300 mu m-500 mu m;
the laser power of the nickel alloy plate to be subjected to laser cleaning on the composite surface is 150W-200W, the scanning speed is 3500 mm/s-4000 mm/s, the scanning line width of a laser beam is 35 mm-45 mm, and the depth of a microtexture on the nickel alloy plate is 500 mu m-800 mu m;
s3, symmetrically assembling the nickel alloy plate, the magnesium alloy plate, the steel strip, the magnesium alloy plate and the nickel alloy plate in sequence, matching a wave trough area of a micro-texture on the surface of the magnesium alloy plate to be compounded with a wave crest of the micro-texture on the corresponding surface of the nickel alloy plate to be compounded, matching a wave crest area of the micro-texture on the surface of the magnesium alloy plate to be compounded with a wave trough area of the micro-texture on the corresponding surface of the nickel alloy plate to be compounded, fitting and aligning the surfaces to be processed to prepare a layered composite blank, and fixing the layered composite blank by using an aluminum rivet;
s4, sealing and welding the layered composite blank prepared in the step S3 in a vacuum electron beam welding mode, wherein the vacuum degree is kept between 0.01Pa and 0.05Pa, and the interface to be processed is ensured to be in a vacuum state;
s5, introducing inert gas into an induction heating furnace, heating the layered composite blank obtained after sealing and welding in the step S4 in the heating furnace to 550-750 ℃, and preserving heat for 120-180 min to obtain a heat-treated composite blank;
s6, hot-feeding the heat-treated composite blank prepared in the step S5 to a rolling mill for rolling, wherein the first pass reduction rate is 15-20%, the total reduction rate is 50-60%, and the rolling speed is 0.5-2 m/min, so that a rolled composite blank is obtained;
s7, annealing the rolled composite blank prepared in the step S6 to accelerate solid diffusion between nickel and magnesium elements and improve the bonding strength of the interface. The annealing temperature is 350 ℃, and the annealing time is 120 min;
s8, cutting off the seal welding position of the annealed rolled composite blank prepared in the step S7, and removing the steel belt layer to obtain two nickel-magnesium composite plates.
Further, in the step S2, the laser beam and the surface to be laser cleaned are perpendicular to each other during the laser cleaning process, and the focal point of the laser beam is located on the surface to be cleaned.
Further, in the step S2, each micro texture is connected end to end, and the continuous micro textures are arranged in a serpentine shape along the length direction of the plate as a whole.
Further, in the step S2, the depth of the microtexture is controlled by setting the laser reciprocating scan number.
Further, in step S2, the blocking agent is any one of talc, graphite powder, rubber, and lubricating oil.
Further, in step S5, the inert gas is argon or helium with a purity of 99%, so as to prevent the surface of the nickel alloy sheet from being oxidized during the heating process.
Furthermore, the thickness of the nickel alloy plate is not more than 2mm, the thickness of the steel strip is equal to that of the nickel alloy plate, the thickness ratio of the single layer of the magnesium alloy plate to the single layer of the nickel alloy plate is (5-20): 1, and the thickness of the layered composite blank is not more than 50 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) before rolling, laser cleaning is carried out on the surfaces to be compounded of the magnesium alloy plate and the nickel alloy plate to prepare a micro-texture, and then rolling compounding is carried out, so that a corrugated joint surface is generated on a magnesium/nickel connecting interface, a metallurgical joint area is increased, mechanical interlocking is generated, and the interface bonding strength of the magnesium/nickel composite material is increased. In addition, compared with the traditional chemical cleaning and mechanical cleaning, the laser cleaning method has better efficiency, environmental protection and no pollution;
(2) and the steel strip is used as a lining plate and promotes nickel-magnesium rolling coordinated deformation. Meanwhile, the characteristics of magnesium steel metallurgy insolubility are utilized, a blocking agent is coated, after rolling annealing treatment is completed, magnesium-steel is separated, a steel belt layer is removed, two nickel-magnesium composite boards are obtained, and the efficiency is high.
Drawings
FIG. 1 is a schematic illustration of a laser cleaning path;
FIG. 2 is a schematic longitudinal sectional view of the layered composite billet;
FIG. 3 is a schematic view of a layered composite billet being rolled;
FIG. 4 is a microstructure of a waveform bonding interface of the nickel-magnesium composite panel prepared in example 1;
fig. 5 is a diffusion diagram of interface elements of the nickel-magnesium composite plate prepared in example 1.
In the figure: 1 is a nickel alloy plate, 2 is a magnesium alloy plate, 3 is a steel strip, and 4 is a roller.
Detailed Description
The invention is described in further detail below with reference to the figures and examples of the specification.
Example 1
In this example 1, two AZ31B magnesium alloy plates and two pure nickel alloy plates were selected as the base material for rolling and compounding, and the size of the AZ31B magnesium alloy plate was: length 450mm x width 300mm x thickness 10mm, the pure nickel alloy plate size is: 450mm by 300mm by 1.5 mm. A Q235 steel strip was selected as the backing layer, 450mm in length, 300mm in width and 1.5mm in thickness.
A method for preparing a nickel-magnesium composite plate by rolling comprises the following steps:
s1, selecting two magnesium alloy plates, two nickel alloy plates and a steel strip with the same width and length dimensions as required, and respectively annealing and toughening the magnesium alloy plates, the nickel alloy plates and the steel strip:
the annealing and toughening treatment temperature of the magnesium alloy plate is 380 ℃, and the heat preservation time is 150 min;
the annealing and toughening treatment temperature of the nickel alloy plate is 750 ℃, and the heat preservation time is 120 min;
the annealing and toughening treatment temperature of the steel strip is 750 ℃, and the heat preservation time is 90 min;
s2, respectively processing the surfaces to be compounded of the nickel alloy plate and the magnesium alloy plate by utilizing laser cleaning, wherein a laser beam is vertical to the surfaces to be cleaned by the laser in the laser cleaning process, the focus of the laser beam is positioned on the surfaces to be cleaned to expose fresh metal, and micro-textures parallel to the width direction of the plate are prepared on the surfaces to be compounded of the nickel alloy plate and the magnesium alloy plate by controlling laser cleaning parameters, each micro-texture is connected end to end, and the continuous micro-textures are integrally arranged in a snake shape along the length direction of the plate (as shown in figure 1); then, sequentially polishing by using an angle grinder, polishing by using sand paper, wiping by using acetone and drying by air, removing rust layers and oxide layers on the non-laser cleaning surface of the magnesium alloy plate and the surfaces on the two sides of the steel strip, and coating a blocking agent on the mechanical polishing surface, wherein the blocking agent is talcum powder;
wherein:
the laser power of the magnesium alloy plate to be subjected to laser cleaning on the composite surface is 75W, the scanning speed is 2500mm/s, the scanning line width of a laser beam is 30mm, and the depth of a microtexture on the magnesium alloy plate is 400 mu m;
the laser power of the nickel alloy plate to be subjected to laser cleaning on the composite surface is 160W, the scanning speed is 3600mm/s, the scanning line width of a laser beam is 40mm, and the depth of a microtexture on the nickel alloy plate is 600 mu m; controlling the depth of the microtexture by setting the reciprocating scanning times of the laser;
s3, symmetrically assembling the nickel alloy plate, the magnesium alloy plate, the steel strip, the magnesium alloy plate and the nickel alloy plate in sequence, matching a micro-texture wave trough area on the surface to be compounded of the magnesium alloy plate with a corresponding micro-texture wave crest on the surface to be compounded of the nickel alloy plate, matching a micro-texture wave trough area on the surface to be compounded of the magnesium alloy plate with a corresponding micro-texture wave trough area on the surface to be compounded of the nickel alloy plate, and jointing and aligning the surfaces to be processed to obtain a layered composite blank (as shown in figure 2), and fixing the layered composite blank by using an aluminum rivet;
s4, performing seal welding treatment on the layered composite blank prepared in the step S3 in a vacuum electron beam welding mode, wherein the vacuum degree is kept at 0.03Pa, and the interface to be processed is ensured to be in a vacuum state;
s5, introducing argon with the purity of 99% into an induction heating furnace, placing the layered composite blank obtained after sealing and welding in the step S4 into the heating furnace, heating to 650 ℃, and preserving heat for 150min to obtain a heat-treated composite blank;
s6, as shown in the figure 3, the heat-treated composite blank prepared in the step S5 is hot-fed to a rolling mill for rolling, the first reduction is 15%, the total reduction is 50%, and the rolling speed is 0.5m/min, so that a rolled composite blank is obtained;
s7, annealing the rolled composite blank prepared in the step S6, wherein the annealing temperature is 350 ℃, and the annealing time is 120 min;
s8, cutting off the seal welding position of the annealed rolled composite blank prepared in the step S7, and removing the steel belt layer to obtain two nickel-magnesium composite plates.
Flaw detection is carried out on the interface of the nickel/magnesium corrugated interface composite material according to the requirement of the GB/T7734-2015 composite board ultrasonic inspection, and the flaw detection result shows that the bonding rate of the nickel/magnesium corrugated interface composite board is 99.8%; according to GB/T6369-2008, testing the tensile shear strength of the interface of the nickel/magnesium composite plate, wherein the tensile shear strength of the interface is 205MPa, performing surface scanning analysis on a tensile shear fracture interface, wherein all the constituent elements of the two fracture surfaces are magnesium, and indicating that the tensile shear fracture occurs at a magnesium alloy position instead of an interface position, the nickel/magnesium composite material prepared by a rolling method is proved to have high interface bonding strength; as shown in fig. 4, when the composite interface is observed by scanning electron microscopy SEM, the bonding area shows a wave shape, the interface bonding is perfect, and there are no defects such as air holes and cracks. As shown in fig. 5, by performing line scan analysis near the interface with EDS, the magnesium element and the nickel element diffuse, indicating that the two materials achieve metallurgical bonding through diffusion reaction.
Example 2
In this example 2, two AZ61 magnesium alloy plates and two pure nickel alloy plates were selected as the base material for rolling and compounding, and the size of the AZ61 magnesium alloy plate was: length 450mm x width 300mm x thickness 12mm, the dimensions of the pure nickel alloy plate are: 450mm by 300mm by 2 mm. A Q235 steel strip was selected as the backing layer, 450mm in length, 300mm in width, 2mm in thickness.
A method for preparing a nickel-magnesium composite plate by rolling comprises the following steps:
s1, selecting two magnesium alloy plates, two nickel alloy plates and a steel strip with the same width and length dimensions as required, and respectively annealing and toughening the magnesium alloy plates, the nickel alloy plates and the steel strip:
the annealing and toughening treatment temperature of the magnesium alloy plate is 380 ℃, and the heat preservation time is 150 min;
the annealing and toughening treatment temperature of the nickel alloy plate is 750 ℃, and the heat preservation time is 120 min;
the annealing and toughening treatment temperature of the steel strip is 750 ℃, and the heat preservation time is 90 min;
s2, respectively processing the surfaces to be compounded of the nickel alloy plate and the magnesium alloy plate by utilizing laser cleaning, wherein a laser beam is vertical to the surfaces to be cleaned by the laser in the laser cleaning process, the focus of the laser beam is positioned on the surfaces to be cleaned to expose fresh metal, and micro-textures parallel to the width direction of the plate are prepared on the surfaces to be compounded of the nickel alloy plate and the magnesium alloy plate by controlling laser cleaning parameters, each micro-texture is connected end to end, and the continuous micro-textures are integrally arranged in a snake shape along the length direction of the plate; then, sequentially polishing by using an angle grinder, polishing by using sand paper, wiping by using acetone and drying by air, removing rust layers and oxide layers on the non-laser cleaning surface of the magnesium alloy plate and the surfaces on the two sides of the steel strip, and coating a barrier agent on the mechanical polishing surface, wherein the barrier agent is graphite powder;
wherein:
the laser power of the magnesium alloy plate to be subjected to laser cleaning on the composite surface is 75W, the scanning speed is 2500mm/s, the scanning line width of a laser beam is 30mm, and the depth of a microtexture on the magnesium alloy plate is 400 mu m;
the laser power of the nickel alloy plate to be subjected to laser cleaning on the composite surface is 160W, the scanning speed is 3600mm/s, the scanning line width of a laser beam is 40mm, and the depth of a microtexture on the nickel alloy plate is 650 mu m; controlling the depth of the microtexture by setting the reciprocating scanning times of the laser;
s3, symmetrically assembling the nickel alloy plate, the magnesium alloy plate, the steel strip, the magnesium alloy plate and the nickel alloy plate in sequence, matching a wave trough area of a micro-texture on the surface of the magnesium alloy plate to be compounded with a wave crest of the micro-texture on the corresponding surface of the nickel alloy plate to be compounded, matching a wave crest area of the micro-texture on the surface of the magnesium alloy plate to be compounded with a wave trough area of the micro-texture on the corresponding surface of the nickel alloy plate to be compounded, fitting and aligning the surfaces to be processed to prepare a layered composite blank, and fixing the layered composite blank by using an aluminum rivet;
s4, performing seal welding treatment on the layered composite blank prepared in the step S3 in a vacuum electron beam welding mode, wherein the vacuum degree is kept at 0.03Pa, and the interface to be processed is ensured to be in a vacuum state;
s5, introducing argon with the purity of 99% into an induction heating furnace, placing the layered composite blank obtained after sealing and welding in the step S4 into the heating furnace, heating to 650 ℃, and preserving heat for 150min to obtain a heat-treated composite blank;
s6, hot-feeding the heat-treated composite blank prepared in the step S5 to a rolling mill for rolling, wherein the first-pass rolling reduction is 20%, the total rolling reduction is 40%, and the rolling speed is 0.8m/min, so that a rolled composite blank is obtained;
s7, annealing the rolled composite blank prepared in the step S6, wherein the annealing temperature is 350 ℃, and the annealing time is 120 min;
s8, cutting off the seal welding position of the annealed rolled composite blank prepared in the step S7, and removing the steel belt layer to obtain two nickel-magnesium composite plates.
Flaw detection is carried out on the interface of the nickel/magnesium corrugated interface composite material according to the requirement of the GB/T7734-2015 composite board ultrasonic inspection, and the flaw detection result shows that the bonding rate of the nickel/magnesium corrugated interface composite board is 99.8%; according to GB/T6369-2008, testing the tensile shear strength of the interface of the nickel/magnesium composite plate, wherein the tensile shear strength of the interface is 185MPa, performing surface scanning analysis on a tensile shear fracture interface, wherein all the constituent elements of the two fracture surfaces are magnesium, and indicating that the tensile shear fracture occurs at a magnesium alloy position instead of an interface position, the nickel/magnesium composite material prepared by a rolling method is proved to have high interface bonding strength; and a scanning electron microscope SEM is used for observing the composite interface, the combination area presents a wave shape, the interface combination is complete, and the defects such as air holes and cracks are avoided. By utilizing the EDS to perform line scanning analysis near the interface, the magnesium element and the nickel element are diffused, which shows that the two materials realize metallurgical bonding through diffusion reaction.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The method for preparing the nickel-magnesium composite plate by rolling is characterized by comprising the following steps of:
s1, selecting two magnesium alloy plates, two nickel alloy plates and a steel strip with the same width and length dimensions as required, and respectively annealing and toughening the magnesium alloy plates, the nickel alloy plates and the steel strip:
the annealing and toughening treatment temperature of the magnesium alloy plate is 350-400 ℃, and the heat preservation time is 120-180 min;
the annealing and toughening treatment temperature of the nickel alloy plate is 650-750 ℃, and the heat preservation time is 120-180 min;
the annealing and toughening treatment temperature of the steel strip is 700-850 ℃, and the heat preservation time is 60-120 min;
s2, respectively treating the surfaces to be compounded of the nickel alloy plate and the magnesium alloy plate by utilizing laser cleaning to expose fresh metal, and preparing microtextures parallel to the width direction of the plate on the surfaces to be compounded of the nickel alloy plate and the magnesium alloy plate by controlling laser cleaning parameters; then, sequentially polishing by using an angle grinder, polishing by using sand paper, wiping by using acetone and air drying, removing rust layers and oxide layers on the non-laser cleaning surface of the magnesium alloy plate and the surfaces on the two sides of the steel strip, and coating a blocking agent on the mechanical polishing surface;
wherein:
the laser power of the magnesium alloy plate to be subjected to laser cleaning on the composite surface is 50W-100W, the scanning speed is 2000 mm/s-3000 mm/s, the scanning line width of a laser beam is 20 mm-35 mm, and the depth of a microtexture on the magnesium alloy plate is 300 mu m-500 mu m;
the laser power of the nickel alloy plate to be subjected to laser cleaning on the composite surface is 150W-200W, the scanning speed is 3500 mm/s-4000 mm/s, the scanning line width of a laser beam is 35 mm-45 mm, and the depth of a microtexture on the nickel alloy plate is 500 mu m-800 mu m;
s3, symmetrically assembling the nickel alloy plate, the magnesium alloy plate, the steel strip, the magnesium alloy plate and the nickel alloy plate in sequence, matching a wave trough area of a micro-texture on the surface of the magnesium alloy plate to be compounded with a wave crest of the micro-texture on the corresponding surface of the nickel alloy plate to be compounded, matching a wave crest area of the micro-texture on the surface of the magnesium alloy plate to be compounded with a wave trough area of the micro-texture on the corresponding surface of the nickel alloy plate to be compounded, fitting and aligning the surfaces to be processed to prepare a layered composite blank, and fixing the layered composite blank by using an aluminum rivet;
s4, sealing and welding the layered composite blank prepared in the step S3 in a vacuum electron beam welding mode, wherein the vacuum degree is kept between 0.01Pa and 0.05Pa, and the interface to be processed is ensured to be in a vacuum state;
s5, introducing inert gas into an induction heating furnace, heating the layered composite blank obtained after sealing and welding in the step S4 in the heating furnace to 550-750 ℃, and preserving heat for 120-180 min to obtain a heat-treated composite blank;
s6, hot-feeding the heat-treated composite blank prepared in the step S5 to a rolling mill for rolling, wherein the first pass reduction rate is 15-20%, the total reduction rate is 50-60%, and the rolling speed is 0.5-2 m/min, so that a rolled composite blank is obtained;
s7, annealing the rolled composite blank prepared in the step S6, wherein the annealing temperature is 350 ℃, and the annealing time is 120 min;
and S8, cutting off the seal welding position of the annealed rolled composite blank prepared in the step S7, and removing the steel tape layer to obtain two nickel-magnesium composite plates.
2. The method for rolling and preparing the nickel-magnesium composite plate according to claim 1, wherein the method comprises the following steps: in step S2, the laser beam and the surface to be laser cleaned are perpendicular to each other during laser cleaning, and the focal point of the laser beam is located on the surface to be cleaned.
3. The method for rolling and preparing the nickel-magnesium composite plate according to claim 1, wherein the method comprises the following steps: in step S2, each microtexture is connected end to end, and the continuous microtexture is arranged in a serpentine shape along the length direction of the plate as a whole.
4. The method for rolling and preparing the nickel-magnesium composite plate according to claim 1, wherein the method comprises the following steps: in the step S2, the depth of the microtexture is controlled by setting the laser reciprocating scan number.
5. The method for rolling and preparing the nickel-magnesium composite plate according to claim 1, wherein the method comprises the following steps: in step S2, the blocking agent is any one of talc, graphite powder, rubber, or lubricating oil.
6. The method for rolling and preparing the nickel-magnesium composite plate according to claim 1, wherein the method comprises the following steps: in step S5, the inert gas is argon or helium with a purity of 99%.
7. The method for rolling and preparing the nickel-magnesium composite plate according to claim 1, wherein the method comprises the following steps: the thickness of the nickel alloy plate is not more than 2mm, the thickness of the steel strip is equal to that of the nickel alloy plate, the thickness ratio of the magnesium alloy plate to the nickel alloy plate is (5-20): 1, and the thickness of the layered composite blank is not more than 50 mm.
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| CN115591937A (en) * | 2022-10-26 | 2023-01-13 | 哈尔滨理工大学（Cn） | Wedge-shaped modular lining plate rolling method for high-performance metal plate |
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