CN113430413A - Processing technology of high-strength AZ91D alloy material - Google Patents
Processing technology of high-strength AZ91D alloy material Download PDFInfo
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- CN113430413A CN113430413A CN202110699491.3A CN202110699491A CN113430413A CN 113430413 A CN113430413 A CN 113430413A CN 202110699491 A CN202110699491 A CN 202110699491A CN 113430413 A CN113430413 A CN 113430413A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1084—Alloys containing non-metals by mechanical alloying (blending, milling)
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
Abstract
The invention relates to the technical field of alloys, in particular to a processing technology of a high-strength AZ91D alloy material, which comprises the following raw materials in parts by weight: 10 parts of graphene powder, 99 parts of AZ91D powder and 99 parts of attapulgite clay powder, and specifically comprises the following steps; s1, taking materials: taking 1-10 parts of graphene powder, 80-99 parts of AZ91D powder and 1-99 parts of attapulgite clay powder; s2, mixing: putting the raw materials obtained in the step S1 into an attritor mill for compounding to obtain composite metal powder; s3, manufacturing a blank: the composite metal powder is charged into a vessel and then melted together with the vessel into liquid metal in a muffle furnace. According to the invention, graphene powder and AZ91D powder are compounded, so that the mechanical properties such as impact resistance and tensile resistance of military equipment and aerospace equipment made of the prepared AZ91D composite material are improved, the military equipment and the aerospace equipment are ensured to be equally firm, the quality is further reduced, and the equipment is more portable.
Description
Technical Field
The invention relates to the technical field of alloys, in particular to a processing technology of a high-strength AZ91D alloy material.
Background
AZ91D belongs to the cast magnesium alloy, mainly depends on the pressure die casting to assist the mode of post-processing to process, can use surface modes such as electrophoresis to change the appearance, the characteristic is that the specific strength is high and the corrosion resistance is improved by a wide margin than pure magnesium, mainly used for the manufacturing of equipment such as military project equipment, aerospace equipment.
Chinese patent No. 201610901581.5 discloses a preparation method of AZ91D alloy with ultra-fine grain solidification structure, which comprises the following steps: (1) pretreatment: carrying out diffusion annealing on the AZ91D alloy cast ingot, and cutting the cast ingot into a sample; (2) sample high-pressure solidification treatment: and (3) placing the sample in the step (1) in a CS-1B type high-pressure cubic press for high-pressure solidification treatment to obtain the sample.
Chinese patent No. 201210017472.9 discloses a combined processing method for preparing high-strength corrosion-resistant magnesium alloy, which comprises the following steps: step one, continuous equal-channel angular extrusion processing: cutting an as-cast AZ91D magnesium alloy block into columnar test pieces, uniformly coating a solid lubricant on the surfaces of the test pieces and a die after the test pieces are subjected to conventional pretreatment, putting the test pieces into the die, heating the test pieces to 230-300 ℃ along with a furnace, carrying out continuous multi-pass equal channel angular extrusion deformation, and rotating the test pieces by 180 degrees between adjacent extrusion passes to realize the ultrafine alloy structure; the second step is that: subsequent micro-arc oxidation surface treatment: cutting the test piece obtained in the first step into a shape required by a member, carrying out micro-arc oxidation treatment on the surface of the test piece after grinding, polishing and ultrasonic cleaning, putting the test piece into silicate electrolyte, and carrying out micro-arc oxidation treatment for 15-20min under the conditions of the applied voltage of 350-400V, the duty ratio of 15-30% and the frequency of 400-600Hz to finally obtain the AZ91D magnesium alloy block material with excellent obdurability and corrosion resistance.
The AZ91D in the prior art has poor impact resistance and tensile resistance, so that manufactured military equipment and aerospace equipment are heavy, the AZ91D material has a defect of microstructure inside, the structural performance of the military equipment and the aerospace equipment is unstable, the AZ91D material has poor corrosion resistance, and the service life of the military equipment and the aerospace equipment is shortened, so that the development of a high-strength AZ91D alloy material processing technology is urgently needed.
Disclosure of Invention
The invention aims to provide a processing technology of a high-strength AZ91D alloy material, which aims to solve the problems of poor impact resistance and tensile resistance, defect in the material and short service life of the material in the background technology.
The technical scheme of the invention is as follows: a processing technology of a high-strength AZ91D alloy material comprises the following raw materials in parts by weight: 10 parts of graphene powder, 99 parts of AZ91D powder and 99 parts of attapulgite clay powder, and specifically comprises the following steps;
s1, taking materials: taking 1-10 parts of graphene powder, 80-99 parts of AZ91D powder and 1-99 parts of attapulgite clay powder;
s2, mixing: putting the raw materials obtained in the step S1 into an attritor mill for compounding to obtain composite metal powder;
s3, manufacturing a blank: filling the composite metal powder into a container, melting the composite metal powder and the container in a muffle furnace to form liquid metal, pouring the liquid metal into a rectangular mold for cooling, and demolding the container to form a composite metal solid blank after the metal in the rectangular mold is molded;
s4, forging: heating the composite metal solid blank in an electric furnace, and forging the heated composite metal solid blank on an electric screw press to obtain a forged piece;
s5, melting, namely putting the forged piece into a smelting furnace for melting, and fishing out the floating slag on the upper layer by using a strainer;
s6, casting: pouring the metal liquid after deslagging into a mould, beating the mould while adding, and demoulding after the metal liquid is formed to obtain a semi-finished workpiece;
s7, quenching: calcining the semi-finished workpiece to 400-500 ℃, and then cooling in the prepared molten salt;
s8, nitriding: putting the semi-finished workpiece after quenching into a vacuum nitriding furnace, electrifying, closing a furnace door when the temperature is raised to 200 ℃ from room temperature, vacuumizing until the pressure in the furnace is minus 0.1-minus 0.06Mpa, and generating a nitriding reaction peak phenomenon during the period of 400-450 ℃, and filling nitrogen at intervals during the period, and cooling to obtain a composite material finished product;
s9, packaging: brushing oil on the newspaper, then airing the newspaper in the sun to prepare oiled paper, and then wrapping the composite material finished product by adopting the aired oiled paper.
Further, in the step S1, the graphene powder is a graphene material with 1-10 layers, the particle size of the AZ91D powder is 10-50 nm, and the AZ91D powder is subjected to magnetic impurity removal.
Further, in the S2, the rotating speed of the ball mill is 30-40 Hz, and the compounding time is 150-200 min.
Further, in the step S3, the temperature of the muffle furnace is 650-750 ℃, and the residue inside the muffle furnace is filtered before the liquid metal is poured into the rectangular mold.
Further, in the S4, the heating temperature in the electric furnace is 550-600 ℃, and the forging time is 0.5-1 h.
Further, in the step S5, the temperature of the smelting furnace is 650-750 ℃, and the strainer is made of graphite.
Further, in S6, before the molten metal is poured into the mold, a mold release agent is coated on the inner surface of the mold, wherein the mold release agent is one or a combination of two or more of methyl silicone oil, emulsified methyl silicone oil, hydrogen-containing methyl silicone oil, silicone grease, silicone resin, silicone rubber and a silicone rubber toluene solution.
Further, in the S7, the molten salt is a mixture of sodium chloride and zinc chloride, and is heated to 400-500 ℃ for melting, and the volume ratio of the sodium chloride to the zinc chloride is 2: 1.
Further, in the step S8, the temperature of the vacuum nitriding furnace is raised to 300 ℃, then cooling circulating water is sent, the temperature is raised to 350 ℃, then heat preservation is carried out for 2-4 hours, after the nitriding reaction is finished, the power is cut off, the temperature is reduced to 200 ℃, then the nitriding furnace is discharged, and in the reaction process, when the temperature is raised to 450 ℃, water accumulated in the furnace is discharged for three times.
Furthermore, the newspaper is overdue newspaper, and the oil brushed on the newspaper is one of linseed oil, tung oil and catalpa oil.
The invention provides a high-strength AZ91D alloy material processing technology by improving, compared with the prior art, the invention has the following improvements and advantages:
(1) according to the invention, graphene powder and AZ91D powder are compounded, so that the mechanical properties such as impact resistance and tensile resistance of military equipment and aerospace equipment made of the prepared AZ91D composite material are improved, the military equipment and the aerospace equipment are ensured to be equally firm, the quality is further reduced, and the equipment is more portable.
(2) According to the invention, the composite metal solid blank is forged by using the press, so that the defects in the composite metal solid blank are eliminated, the microstructure is optimized, the internal structure of the composite material is controlled, and the structural performance of the manufactured military equipment and aerospace equipment is more stable.
(3) The workpiece is treated by quenching and nitriding, so that the surface of the workpiece is firmer and corrosion resistant, the service life of military equipment and aerospace equipment is prolonged, and the cost of scientific research projects of the military equipment and the aerospace equipment is reduced.
(4) The invention utilizes the newspaper coated with oil to package the workpiece, thereby conveniently realizing the waste utilization of the expired newspaper, reducing the pollution of the waste package to the environment, and on the other hand, the contained newspaper can protect the formed product, so that the phenomenon of corrosion caused by moist air can not occur in the product storage process.
Drawings
The invention is further explained below with reference to the figures and examples:
FIG. 1 is an overall flow diagram of the present invention;
FIG. 2 is a flow chart of blank making according to the present invention.
Detailed Description
The present invention will be described in detail with reference to fig. 1-2, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
A processing technology of a high-strength AZ91D alloy material comprises the following raw materials in parts by weight: 10 parts of graphene powder, 99 parts of AZ91D powder and 99 parts of attapulgite clay powder, and specifically comprises the following steps;
s1, taking materials: taking 4 parts of graphene powder, 90 parts of AZ91D powder and 20 parts of attapulgite clay powder;
s2, mixing: putting the raw materials obtained in the step S1 into an attritor mill for compounding to obtain composite metal powder;
s3, manufacturing a blank: filling the composite metal powder into a container, melting the composite metal powder and the container in a muffle furnace to form liquid metal, pouring the liquid metal into a rectangular mold for cooling, and demolding the container to form a composite metal solid blank after the metal in the rectangular mold is molded;
s4, forging: heating the composite metal solid blank in an electric furnace, and forging the heated composite metal solid blank on an electric screw press to obtain a forged piece;
s5, melting, namely putting the forged piece into a smelting furnace for melting, and fishing out the floating slag on the upper layer by using a strainer;
s6, casting: pouring the metal liquid after deslagging into a mould, beating the mould while adding, and demoulding after the metal liquid is formed to obtain a semi-finished workpiece;
s7, quenching: calcining the semi-finished workpiece to 400 ℃, and then cooling in the prepared molten salt;
s8, nitriding: putting the semi-finished workpiece after quenching into a vacuum nitriding furnace, electrifying, closing a furnace door when the temperature is raised to 200 ℃ from room temperature, vacuumizing until the pressure in the furnace is negative 0.1Mpa, generating a nitriding reaction peak phenomenon at 400 ℃, filling nitrogen at intervals during the period, and cooling to obtain a composite material finished product;
s9, packaging: brushing oil on the newspaper, then airing the newspaper in the sun to prepare oiled paper, and then wrapping the composite material finished product by adopting the aired oiled paper.
Further, in S1, the graphene powder is a 5-layer graphene material, the particle size of the AZ91D powder is 10 nm, and the AZ91D powder is subjected to removal of magnetic impurities.
Further, in S2, the ball mill rotation speed was 30Hz, and the compounding time was 150 min.
Further, at S3, the muffle furnace temperature is 650 ℃, and the residue inside is filtered before the liquid metal is poured into the rectangular mold.
Further, in S4, the heating temperature in the electric furnace was 550 ℃ and the forging time was 1 hour.
Further, in S5, the temperature of the smelting furnace is 650 ℃, and the colander is made of graphite.
Further, in S6, before the molten metal is poured into the mold, a mold release agent is applied to the inner surface of the mold, wherein the mold release agent is one or a combination of two or more of methyl silicone oil, emulsified methyl silicone oil, hydrogen-containing methyl silicone oil, silicone grease, silicone resin, silicone rubber, and a silicone rubber toluene solution.
Further, in S7, the molten salt is a mixture of sodium chloride and zinc chloride, which is heated to 400-500 ℃ for melting, and the volume ratio of the sodium chloride to the zinc chloride is 2: 1.
Further, in S8, the vacuum nitriding furnace is heated to 300 ℃, then cooling circulating water is sent, the temperature is raised to 350 ℃, then heat preservation is carried out for 2 hours, after the nitriding reaction is finished, the power is cut off, the temperature is reduced to 200 ℃, then the nitriding furnace is discharged, and in the reaction process, when the temperature is raised to 450 ℃, water accumulated in the furnace is discharged for three times.
Furthermore, the newspaper is overdue newspaper, and the oil brushed on the newspaper is linseed oil.
Example two
A processing technology of a high-strength AZ91D alloy material comprises the following raw materials in parts by weight: 10 parts of graphene powder, 99 parts of AZ91D powder and 99 parts of attapulgite clay powder, and specifically comprises the following steps;
s1, taking materials: taking 6 parts of graphene powder, 90 parts of AZ91D powder and 20 parts of attapulgite clay powder;
s2, mixing: putting the raw materials obtained in the step S1 into an attritor mill for compounding to obtain composite metal powder;
s3, manufacturing a blank: filling the composite metal powder into a container, melting the composite metal powder and the container in a muffle furnace to form liquid metal, pouring the liquid metal into a rectangular mold for cooling, and demolding the container to form a composite metal solid blank after the metal in the rectangular mold is molded;
s4, forging: heating the composite metal solid blank in an electric furnace, and forging the heated composite metal solid blank on an electric screw press to obtain a forged piece;
s5, melting, namely putting the forged piece into a smelting furnace for melting, and fishing out the floating slag on the upper layer by using a strainer;
s6, casting: pouring the metal liquid after deslagging into a mould, beating the mould while adding, and demoulding after the metal liquid is formed to obtain a semi-finished workpiece;
s7, quenching: calcining the semi-finished workpiece to 400 ℃, and then cooling in the prepared molten salt;
s8, nitriding: putting the semi-finished workpiece after quenching into a vacuum nitriding furnace, electrifying, closing a furnace door when the temperature is raised to 200 ℃ from room temperature, vacuumizing until the pressure in the furnace is negative 0.1Mpa, generating a nitriding reaction peak phenomenon at 400 ℃, filling nitrogen at intervals during the period, and cooling to obtain a composite material finished product;
s9, packaging: brushing oil on the newspaper, then airing the newspaper in the sun to prepare oiled paper, and then wrapping the composite material finished product by adopting the aired oiled paper.
Further, in S1, the graphene powder is a 5-layer graphene material, the particle size of the AZ91D powder is 10 nm, and the AZ91D powder is subjected to removal of magnetic impurities.
Further, in S2, the ball mill rotation speed was 30Hz, and the compounding time was 150 min.
Further, at S3, the muffle furnace temperature is 650 ℃, and the residue inside is filtered before the liquid metal is poured into the rectangular mold.
Further, in S4, the heating temperature in the electric furnace was 550 ℃ and the forging time was 1 hour.
Further, in S5, the temperature of the smelting furnace is 650 ℃, and the colander is made of graphite.
Further, in S6, before the molten metal is poured into the mold, a mold release agent is applied to the inner surface of the mold, wherein the mold release agent is one or a combination of two or more of methyl silicone oil, emulsified methyl silicone oil, hydrogen-containing methyl silicone oil, silicone grease, silicone resin, silicone rubber, and a silicone rubber toluene solution.
Further, in S7, the molten salt is a mixture of sodium chloride and zinc chloride, which is heated to 400-500 ℃ for melting, and the volume ratio of the sodium chloride to the zinc chloride is 2: 1.
Further, in S8, the vacuum nitriding furnace is heated to 300 ℃, then cooling circulating water is sent, the temperature is raised to 350 ℃, then heat preservation is carried out for 2 hours, after the nitriding reaction is finished, the power is cut off, the temperature is reduced to 200 ℃, then the nitriding furnace is discharged, and in the reaction process, when the temperature is raised to 450 ℃, water accumulated in the furnace is discharged for three times.
Furthermore, the newspaper is overdue newspaper, and the oil brushed on the newspaper is linseed oil.
EXAMPLE III
A processing technology of a high-strength AZ91D alloy material comprises the following raw materials in parts by weight: 10 parts of graphene powder, 99 parts of AZ91D powder and 99 parts of attapulgite clay powder, and specifically comprises the following steps;
s1, taking materials: taking 8 parts of graphene powder, 90 parts of AZ91D powder and 20 parts of attapulgite clay powder, wherein the graphene powder is a 5-layer graphene material, the particle size of the AZ91D powder is 10 nanometers, and removing magnetic impurities from the AZ91D powder;
s2, mixing: putting the raw materials obtained in the step S1 into an attritor mill for compounding to obtain composite metal powder, wherein the rotating speed of the attritor mill is 30Hz, and the compounding time is 150 min;
s3, manufacturing a blank: filling the composite metal powder into a container, melting the composite metal powder and the container in a muffle furnace to form liquid metal, pouring the liquid metal into a rectangular mold for cooling, demolding the container to form a composite metal solid blank after the metal in the rectangular mold is formed, wherein the temperature of the muffle furnace is 650 ℃, and filtering residues inside the liquid metal before pouring the liquid metal into the rectangular mold;
s4, forging: heating the composite metal solid blank in an electric furnace, and forging the composite metal solid blank on an electric screw press after heating to obtain a forged piece, wherein the heating temperature in the electric furnace is 550 ℃, and the forging time is 1 h;
s5, melting, namely putting the forged piece into a melting furnace for melting, and fishing out floating slag on the upper layer by using a strainer, wherein the temperature of the melting furnace is 650 ℃, and the strainer is made of graphite;
s6, casting: pouring the metal liquid after deslagging into a mould, beating the mould while adding, demoulding after the metal liquid is formed to obtain a semi-finished workpiece, and brushing a demoulding agent on the inner surface of the mould before the metal liquid is poured into the mould, wherein the demoulding agent is one or the combination of more than two of methyl silicone oil, emulsified methyl silicone oil, hydrogen-containing methyl silicone oil, silicone grease, silicone resin, silicone rubber and a silicone rubber toluene solution;
s7, quenching: calcining the semi-finished workpiece to 400 ℃, and then cooling the semi-finished workpiece in prepared molten salt, wherein the molten salt is a mixture of sodium chloride and zinc chloride, and is heated to 500 ℃ for melting, and the volume ratio of the sodium chloride to the zinc chloride is 2: 1;
s8, nitriding: putting the semi-finished workpiece after quenching into a vacuum nitriding furnace, electrifying, closing a furnace door when the temperature rises to 200 ℃ from room temperature, vacuumizing until the pressure in the furnace is negative 0.1Mpa, and a nitriding reaction peak phenomenon appears at 400 ℃, intermittently filling nitrogen during the period, cooling to obtain a composite material finished product, heating the vacuum nitriding furnace to 300 ℃, sending cooling circulating water, heating to 350 ℃, keeping the temperature for 2 hours, cutting off the power and cooling to 200 ℃ after the nitriding reaction is finished, discharging the water accumulated in the furnace for three times during the reaction process when the temperature rises to 450 ℃;
s9, packaging: brushing oil on the newspaper, then airing the newspaper in the sun to prepare oiled paper, and then wrapping the composite material finished product by adopting the aired oiled paper, wherein the newspaper is overdue newspaper, and the oil brushed on the newspaper is linseed oil.
The parts of the graphene powder adopted in the first embodiment, the second embodiment and the third embodiment are different, and the other parameters are consistent, and the results are shown in the following table by performing a tensile test on the finally obtained composite alloy and comparing the composite alloy with a traditional magnesium alloy AZ 91D:
| material | Content of graphene | Content of AZ91D powder | Tensile strength |
| AZ91D alloy | Is free of | 90 portions of | 250mpa |
| Example one | 4 portions of | 90 portions of | 350mpa |
| Example two | 6 portions of | 90 portions of | 500mpa |
| EXAMPLE III | 8 portions of | 90 portions of | 710mpa |
As can be seen from the above table, the tensile strength is highest in the third example, and therefore the effect is the best in the third example.
The working principle is as follows: the composite material comprises the following raw materials in parts by weight: 10 parts of graphene powder, 99 parts of AZ91D powder and 99 parts of attapulgite clay powder, and specifically comprises the following steps; s1, taking materials: taking 4 parts of graphene powder, 90 parts of AZ91D powder and 20 parts of attapulgite clay powder; s2, mixing: putting the raw materials obtained in the step S1 into an attritor mill for compounding to obtain composite metal powder; s3, manufacturing a blank: filling the composite metal powder into a container, melting the composite metal powder and the container in a muffle furnace to form liquid metal, pouring the liquid metal into a rectangular mold for cooling, and demolding the container to form a composite metal solid blank after the metal in the rectangular mold is molded; s4, forging: heating the composite metal solid blank in an electric furnace, and forging the heated composite metal solid blank on an electric screw press to obtain a forged piece; s5, melting, namely putting the forged piece into a smelting furnace for melting, and fishing out the floating slag on the upper layer by using a strainer; s6, casting: pouring the metal liquid after deslagging into a mould, beating the mould while adding, and demoulding after the metal liquid is formed to obtain a semi-finished workpiece; s7, quenching: calcining the semi-finished workpiece to 400 ℃, and then cooling in the prepared molten salt; s8, nitriding: putting the semi-finished workpiece after quenching into a vacuum nitriding furnace, electrifying, closing a furnace door when the temperature is raised to 200 ℃ from room temperature, vacuumizing until the pressure in the furnace is negative 0.1Mpa, generating a nitriding reaction peak phenomenon at 400 ℃, filling nitrogen at intervals during the period, and cooling to obtain a composite material finished product; s9, packaging: brushing oil on the newspaper, then airing the newspaper in the sun to prepare oiled paper, and then wrapping the composite material finished product by adopting the aired oiled paper.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A processing technology of a high-strength AZ91D alloy material is characterized by comprising the following steps: the composite material comprises the following raw materials in parts by weight: 10 parts of graphene powder, 99 parts of AZ91D powder and 99 parts of attapulgite clay powder, and specifically comprises the following steps;
s1, taking materials: taking 1-10 parts of graphene powder, 80-99 parts of AZ91D powder and 1-99 parts of attapulgite clay powder;
s2, mixing: putting the raw materials obtained in the step S1 into an attritor mill for compounding to obtain composite metal powder;
s3, manufacturing a blank: filling the composite metal powder into a container, melting the composite metal powder and the container in a muffle furnace to form liquid metal, pouring the liquid metal into a rectangular mold for cooling, and demolding the container to form a composite metal solid blank after the metal in the rectangular mold is molded;
s4, forging: heating the composite metal solid blank in an electric furnace, and forging the heated composite metal solid blank on an electric screw press to obtain a forged piece;
s5, melting, namely putting the forged piece into a smelting furnace for melting, and fishing out the floating slag on the upper layer by using a strainer;
s6, casting: pouring the metal liquid after deslagging into a mould, beating the mould while adding, and demoulding after the metal liquid is formed to obtain a semi-finished workpiece;
s7, quenching: calcining the semi-finished workpiece to 400-500 ℃, and then cooling in the prepared molten salt;
s8, nitriding: putting the semi-finished workpiece after quenching into a vacuum nitriding furnace, electrifying, closing a furnace door when the temperature is raised to 200 ℃ from room temperature, vacuumizing until the pressure in the furnace is minus 0.1-minus 0.06Mpa, and generating a nitriding reaction peak phenomenon during the period of 400-450 ℃, and filling nitrogen at intervals during the period, and cooling to obtain a composite material finished product;
s9, packaging: brushing oil on the newspaper, then airing the newspaper in the sun to prepare oiled paper, and then wrapping the composite material finished product by adopting the aired oiled paper.
2. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: in the S1, the graphene powder is a graphene material with 1-10 layers, the particle size of the AZ91D powder is 10-50 nanometers, and the AZ91D powder is subjected to magnetic impurity removal.
3. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: in the S2, the rotating speed of the ball mill is 30-40 Hz, and the compounding time is 150-200 min.
4. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: in the step S3, the temperature of the muffle furnace is 650-750 ℃, and the residue inside the muffle furnace is filtered before the liquid metal is poured into the rectangular mold.
5. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: in the S4, the heating temperature in the electric furnace is 550-600 ℃, and the forging time is 0.5-1 h.
6. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: in the step S5, the temperature of the smelting furnace is 650-750 ℃, and the strainer is made of graphite.
7. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: in S6, before the molten metal is poured into the mold, a mold release agent is coated on the inner surface of the mold, wherein the mold release agent is one or a combination of two or more of methyl silicone oil, emulsified methyl silicone oil, hydrogen-containing methyl silicone oil, silicone grease, silicone resin, silicone rubber and a silicone rubber toluene solution.
8. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: in the S7, the molten salt is a mixture of sodium chloride and zinc chloride, which is heated to 400-500 ℃ for melting, and the volume ratio of the sodium chloride to the zinc chloride is 2: 1.
9. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: and in the S8, heating the vacuum nitriding furnace to 300 ℃, then sending cooling circulating water, heating to 350 ℃, then preserving heat for 2-4h, cutting off the power, cooling to 200 ℃ and then discharging, wherein in the reaction process, when the temperature is increased to 450 ℃, water accumulated in the furnace is discharged for three times.
10. The processing technology of the high-strength AZ91D alloy material according to claim 1, wherein the processing technology comprises the following steps: the newspaper is overdue newspaper, and the oil brushed on the newspaper is one of linseed oil, tung oil and catalpa oil.
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