CN109504889B - Bimetal positioning fusion process for (Ti, W) Cp/Fe in-situ composite material and product - Google Patents
Bimetal positioning fusion process for (Ti, W) Cp/Fe in-situ composite material and product Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/14—Casting in, on, or around objects which form part of the product the objects being filamentary or particulate in form
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
The invention discloses a (Ti, W) Cp/Fe in-situ composite bimetal positioning fusion process, which comprises the following steps: mixing hard phase particles (Ti, W) C and active element particles Cr, Mo and Cu with cold glue, preparing the mixture into particles, pressing the particles into a precast block, and placing the precast block at a specified position; pouring the molten steel of the matrix material which is well smelted into the precast block in a negative pressure environment, wherein the pouring temperature is 1600-1650 ℃; and (5) after the casting is finished, quenching after solidification to obtain the (Ti, W) Cp/Fe in-situ composite material. The mass ratio of the hard phase particles (Ti, W) C to the molten alloy steel serving as the matrix material is 5-30%, and the density ratio of the hard phase particles (Ti, W) C to the iron-based metal liquid is 0.9-1.1. According to the invention, through in-situ fusion of the (Ti, W) C particles and the active element with the base material, metallurgical bonding of the hard phase and the base material is strengthened, the hard phase is prevented from falling and separating, the uniform distribution of the particles is enhanced, the strength, toughness and wear resistance of a product positioning and enhancing area are enhanced, the product application range is improved, the service life is prolonged, and the process difficulty and production cost are reduced.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a (Ti, W) Cp/Fe in-situ composite bimetal positioning fusion process and a product.
Background
The composite material is called as a novel engineering material in the 21 st century, and the metal-based particle reinforced composite material becomes an important branch of the composite material with excellent comprehensive performance and development prospect of high specific strength, high specific modulus, low thermal expansion, heat resistance, wear resistance, electric conduction, flame retardance, no gas release in use and the like.
The research on metal matrix composite materials mainly focuses on the basic aspect of light materials at present, but the research and application of the metal matrix composite materials as steel matrix composite materials widely used in production are in the initial exploration stage, mainly on the theoretical aspects of microstructure, interface, solidification process preparation technology and the like under laboratory conditions, and the application and development of the metal matrix composite materials are rarely reported. The specific strength price of the steel material is the lowest engineering material except cement, but the comprehensive performance of the steel material is far higher than that of the cement, and the application range is wide.
Iron-based composite materials have a high melting point, a high density, a difficult manufacturing process and other reasons compared with light metal composite materials, and therefore, research results are few, and the iron-based composite materials become fields to be developed urgently.
At present, the main research results of the particle reinforced iron-based composite material are as follows:
1. integral composite
Powder metallurgy: the alloy elements and the iron-based powder are stirred, pressed into blocks and sintered to generate the iron-based composite material. This material has high hardness, but has high production cost and poor toughness, and is difficult to form a strong bond with the parent material.
A smelting method comprises the following steps: adding hard alloy particles into the iron-based metal liquid, electromagnetically stirring and mixing, and then casting and molding. The method has the disadvantages that the wettability of the reinforced particles and the matrix is poor, the reinforced particles cannot form fused metallurgical bonding with the matrix, the falling of the reinforced particles is easy to occur in the using process, the common reinforced particles are generally low in density, the segregation is serious, the dispersion and uniform distribution are difficult to form, and harmful phases are easy to generate.
In-situ reaction casting method: adding alloy element powder particles into iron-based molten metal in a smelting furnace, and carrying out isothermal reaction in the smelting process to generate a hard phase in situ. The carbide and the matrix are well wetted, the interface is clean, the reinforced particles are uniformly dispersed and distributed, the process is simple, and the cost is low. However, the method is limited to the integral reinforcement of a single material, and cannot be used for separately positioning and compounding the working parts, so that the performance requirements of different parts of the mechanical part cannot be met.
2. Surface layer composite
Coating method: the alloy powder and the binding component are mixed and sprayed on the surface of the casting mould, and the molten metal and the coating material are reflected to generate a composite layer. The disadvantages are that the composite layer is less than 1mm and the wear-resistant life is low.
Self-propagating cast infiltration (SHS): the prefabricated alloy powder sheet is placed on the surface layer, and is ignited by molten steel metal liquid, and the prefabricated sheet reflects heat to be dissolved in the matrix to form a hard phase. The combustion synthesis process is completed in a short time, the process is difficult to control, poor interface reaction and segregation are caused, and non-equilibrium transition phase impurities are remained; in addition, the porosity of the SHS process is high, making it difficult to produce dense materials.
3. Local compounding
There is an increased need in production to improve the wear resistance of the working parts of the components, however, the performance requirements of the component joints or supporting parts are often high toughness and strength, requiring the composite of hard materials in the working parts rather than the integral or skin composite.
Mechanical compounding: solid welding, embedding, solid-liquid combination and the like are generally adopted. However, the defects of mechanical bonding cause the bonding unreliability, and the phenomena of falling and breaking frequently occur in the work, which damages the equipment, affects the service life of parts, causes material waste and increases the equipment maintenance cost.
Double-liquid compounding: two kinds of metal liquid, hard material and tough material, are compounded together in semi-solidified state. The method has the defects of poor controllability and low yield in the compounding process; the interface has poor wetting, the composite quality is unstable, and the composite material is easy to fatigue fracture and fall off; the production process is complex and the product cost is high.
In the two previous inventions of the applicant, the bimetal composite product is prepared by placing hard alloy particles (the particle size is 0.1mm multiplied by 0.1mm to 20mm multiplied by 20mm) in a mould and then pouring the alloy solution of the matrix material, and the obtained product can realize the metallurgical bonding of the hard alloy material and the matrix material and has better wear resistance. However, in further practice, it is gradually found that the product adopting the scheme still has the phenomenon of particle shedding of the hard alloy part, and further improvement is needed.
In summary, the applicant of the present application has created a bimetal positioning fusion process and product of (Ti, W) Cp/Fe in-situ composite material, which can satisfy the requirement of forming a dispersive metallurgical fusion in situ between a hard reinforcing phase and a matrix material, avoid the separation by falling off, and fix the composite material in a designated area, thereby realizing the local reinforcement (non-surface layer), and satisfying the different performance requirements of different parts of the part.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a bimetal positioning fusion process for a (Ti, W) Cp/Fe in-situ composite material, which can meet the requirement of in-situ formation of dispersive metallurgical fusion between a hard reinforcing phase and a base material, avoid falling and separation, fix the composite material in a specified area, realize local reinforcement (non-surface layer), meet different performance requirements of different parts of a part, and overcome the defects of the existing bimetal composite process.
In order to solve the technical problems, the invention provides a (Ti, W) Cp/Fe in-situ composite bimetal positioning fusion process, which comprises the following steps:
(1) mixing hard phase particles (Ti, W) C and active element particles Cr, Mo and Cu with cold glue, preparing the mixture into particles, pressing the particles into a precast block, and placing the precast block at a specified position;
(2) pouring the molten base material steel subjected to smelting treatment into the precast block in a negative pressure environment, wherein the pouring temperature is 1600-1650 ℃;
(3) after the pouring is finished and the solidification is finished, the (Ti, W) Cp/Fe in-situ composite material is generated by quenching.
In a further improvement, the grain size of the hard phase particles (Ti, W) C and the active element particles Cr, Mo and Cu in the step (1) is 5-10 microns.
Further improvement, the mass ratio of the hard phase particles (Ti, W) C to the matrix material molten steel is 5-30%.
Further improved, the ratio of the density of the hard phase particles (Ti, W) C to the density of the matrix material molten steel is 0.9-1.1.
Further improvement, the mass ratio of the active element particles Cr, Mo and Cu to the matrix material molten steel is respectively 1-5%, 0.3-0.5% and 0.3-0.5%;
the prefabricated block also comprises an auxiliary agent accounting for 0.3-0.4% of the mass ratio of the matrix material molten steel.
In a further improvement, the negative pressure environment in the step (2) is obtained by vacuumizing a closed box body, the precast block is arranged at a designated position in a mould, and the mould is arranged in the closed box body; the base material is cast steel or alloy cast steel.
In a further improvement, precious pearl sand with low thermal conductivity is filled between the inner wall of the closed box body and the outer side of the mould.
Further improvement, after the pouring in the step (3) is finished, the negative pressure is stopped for 1-2 minutes, and the temperature in the box body is kept to be not lower than 1550 ℃ within 3 minutes; then the negative pressure is started rapidly to achieve rapid cooling.
The invention also discloses a (Ti, W) Cp/Fe in-situ composite bimetal positioning fusion product, which is prepared by applying the (Ti, W) Cp/Fe in-situ composite bimetal positioning fusion process, wherein the hardness of a working part of the product is HRC60-65, and the microhardness is 2.795 GPa.
Further improved, the product is a crusher hammer head, a lining plate, a railway tamping pickaxe or a mining machinery equipment accessory.
After adopting such design, the invention has at least the following advantages:
the invention further strengthens the metallurgical fusion between the titanium tungsten carbide hard phase and the matrix metal material by the in-situ fusion of the hard carbide (Ti, W) C particles and the active elements with the matrix material, thereby effectively avoiding the falling and separation of the hard phase.
According to the invention, the strength, toughness and wear resistance of the designated part of the bimetal composite product are further enhanced through the positioning and compounding of the (Ti, W) Cp/Fe in-situ composite material and the matrix material, the application range of the bimetal composite product is improved, and the service life of the bimetal composite product is prolonged; and because the one-time pouring is adopted, a plurality of difficulties of secondary pouring of the bimetal liquid are avoided, the process difficulty and the production cost are reduced, and the method is more suitable for popularization and application.
The invention has controllable process, low production cost, high yield and firm compounding, and can meet the performance requirements of different parts of mechanical parts.
Detailed Description
The invention aims to provide a (Ti, W) Cp/Fe in-situ composite material bimetal positioning composite process, which exerts the characteristic of strong bonding capability of active elements, and the reinforcing phase (Ti, W) C and the matrix alloy molten steel form in-situ fusion to avoid falling and separation. And the position of the (Ti, W) Cp/Fe in-situ composite material is fixed, and the fusion is positioned according to production requirements, so that the wear resistance of the working surface can be further improved, and the process difficulty and the production cost are reduced. The specific process steps are as follows:
the process for bimetallic positioning fusion of the (Ti, W) Cp/Fe in-situ composite material comprises the following steps:
(1) mixing hard phase particles (Ti, W) C, active element particles Cr, Mo and Cu and an auxiliary agent with cold glue to prepare particles with the size similar to that of lost foam beads, pressing the particles into a precast block with a required shape, and placing the precast block at a specified position of a mold;
wherein, the Mohs hardness of titanium carbide (TiC) is 9.5, the microhardness is 2.795GPa, the hardness is second to that of diamond, the high thermal stability is achieved, the high hardness face-centered cubic structure is achieved, the lattice constant and the lattice type are very similar to those of austenite, and the combination with a matrix is convenient. The Mohs hardness of tungsten carbide (WC) is 9, the microhardness is 1.73GPa, the melting point is high (2870 degrees) and the density is highest (19.3 g/cm)2) The high-temperature-resistant and high-elasticity-resistant composite material has the highest high-temperature performance and thermal conductivity, has very high compression modulus and elastic modulus, and has excellent wettability with iron-based metal. The lattice structures of W and Ti are similar, and eutectic compounds are easily formed; w replaces Ti in TiC, and the density of generated (Ti, W) C is close to that of iron-based metal, so that the segregation of a reinforcing phase and a matrix is reduced, and the dispersion and the uniform distribution are facilitated.
In the embodiment, the density ratio of the hard phase particles (Ti, W) C to the iron-based metal liquid is 0.9-1.1, namely the density of the hard phase particles (Ti, W) C is approximate to that of the iron-based metal liquid, so that the in-situ composite reaction is promoted, and the material performance is improved.
The particle sizes of the hard phase particles (Ti, W) C and the active element particles Cr, Mo and Cu are 5-10 microns. And the mass of the hard phase particles (Ti, W) C, Cr, Mo, Cu and the auxiliary agent accounts for 3-15%, 1-5%, 0.3-0.5% and 0.3-0.4% of the mass of the matrix of the reinforced part respectively.
In the embodiment, the cold glue is EPS cold glue, and the auxiliary agent is a common homogenizing agent in the field, so that the homogenization effect is achieved.
(2) And pouring molten base material steel which is well smelted into the prepared precast block in a negative pressure environment, wherein the pouring temperature is 1600-1650 ℃.
The matrix material is cast steel or alloy cast steel, and the molten steel of the matrix material in the embodiment is iron-based metal liquid, and the density of the molten steel is about 7.8. In this embodiment, the negative pressure environment is obtained by vacuuming the enclosure, placing the precast block at a designated position in a mold, and placing the mold inside the enclosure.
3) After the pouring is finished and the solidification is finished, the (Ti, W) Cp/Fe in-situ composite material is generated by quenching.
Wherein the quenching temperature is 850-950 ℃.
After the hard phase (Ti, W) C and the high-temperature iron-based metal liquid are subjected to one-time pouring and mixing, the iron-based metal liquid, the hard phase (Ti, W) C and the active element form in-situ fusion in the processes of heat preservation and solidification, and meanwhile, the titanium-carbon reaction releases heat to provide heat for the continuous reaction of other carbon and titanium; wherein the active elements reduce the interface energy, so that the electronegativity is stronger, and dispersive in-situ fusion is formed. The hard phase generated in situ has obvious strengthening effect relative to the matrix; the matrix material is formed by tightly and firmly fusing titanium tungsten carbide together by using a strong martensite matrix, and has a supporting and protecting effect on reinforced particles, and the two materials supplement each other, so that the performance of the composite material is greatly improved, and the service life of a product is finally prolonged.
In addition, in the pouring process, the closed box body is filled with the jewel sand with low thermal conductivity in a matched mode, and if the jewel sand is filled between the inner wall of the closed box body and the outer side of the mold, a good heat preservation effect can be achieved. If after pouring, the negative pressure is stopped for 1-2 minutes, the temperature in the box body can be kept to be not lower than 1550 ℃ within 3 minutes, then the negative pressure is started rapidly, the heat in the box body is removed, the box body is solidified rapidly, the high-temperature-preservation and rapid-solidification process is realized, and the completion of in-situ composite reaction is facilitated.
In the (Ti, W) Cp/Fe in-situ composite material bimetal positioning composite process, as the density of the reinforced phase (Ti, W) C is similar to that of an iron-based metal matrix material, and the reinforced phase (Ti, W) C is similar to the lattice type of austenite and has good wettability, the reinforced phase (Ti, W) C can be used as the crystal core of the austenite, and can play a role in refining the structure and strengthening the matrix. Active elements are diffused to the edge of the enhanced phase and are enriched in a phase interface layer to form a coating film structure, so that the wettability can be improved, the complex reaction of (Ti, W) C and other elements is promoted, and the enhanced phase and a base material are promoted to form metallurgical fusion.
The invention also solves the segregation problem caused by the density difference between the reinforcing phase and the matrix material by reacting under the non-gravity condition of the negative pressure environment; in addition, the pouring temperature and the heat preservation time in the process are also important conditions for the in-situ composite reaction between the reinforcing phase and the matrix material, the complete reaction of the composite process can be well promoted, and the generation of harmful phases is reduced.
Therefore, the (Ti, W) Cp/Fe in-situ composite bimetal positioning and compounding process can solve the problems of poor uniformity, poor wettability and poor density in the existing technology for producing the iron-based composite.
The (Ti, W) Cp/Fe in-situ composite bimetal positioning fusion process can produce the (Ti, W) Cp/Fe in-situ composite bimetal positioning fusion product which can be a crusher hammer head, a lining plate, a railway tamping pick or a mining machinery equipment accessory. The hardness of the working part of the product is HRC60-65, and the microhardness is 2.795 GPa.
Specific product examples are as follows.
Example one
The tamping pickaxe of the railway tamping equipment is produced by utilizing the (Ti, W) Cp/Fe in-situ composite material bimetal positioning fusion process, the matrix component is an alloy cast steel material, reinforcing element titanium tungsten carbide, active element particles Cr, Mo, Cu, a homogenizing agent and the like are mixed to prepare particles with the size similar to that of lost foam beads, and the particles are formed by cold glue and are placed at the top end of a working part in a tamping pickaxe die. Pouring the matrix molten steel at 1650 ℃ to generate a compound titanium tungsten carbide in situ, wherein the microhardness is 2.795 GPa; the quenching temperature is 850 ℃ for air cooling, and the hardness of the working part of the hammer head of the tamping pick is HRC 66. The upper part of the tamping pickaxe is cylindrical, the wear-resistant composite layer is 50mm 35mm 130mm, and the total weight is 13.5 kg.
The tamping pick works on granite stones, strong impact is generated in the working process, and the hard alloy of the wear-resistant pick palm part is not cracked in the tamping pick test.
Example two
The (Ti, W) Cp/Fe in-situ composite bimetal positioning fusion process is used to produce one-piece hammer head for crusher, and the matrix consists of alloy cast steel material, reinforcing elements of titanium tungsten carbide, active elements of chromium, copper and molybdenum and homogeneous materialMixing the agent and the like, prefabricating a granular structure similar to the size of lost foam beads, molding by using cold glue, and placing the granular structure at a working part position in a hammer head die. Pouring matrix molten steel at 1600 ℃ to generate the (Ti, W) C in-situ fusion material, wherein the Mohs hardness of the (Ti, W) C is 9.5, the microhardness is 2.795GPa, the tensile strength is 514Mpa, and the impact toughness is 2.8J/cm2Bending strength: n/cm21150; the quenching temperature is 850 ℃ for air cooling, and the hardness of the hammer head working part is HRC 65. The total weight of the hammer is 9.5 kg, the shape is a cuboid 65mm 30mm 590mm, and the wear-resistant composite layer is 65mm 30mm 50 mm.
The hammer head can crush 4000-year 5000-calorie coal without strong impact force, the abrasion surface is concave-convex, and the positioning reinforced part has no fragmentation phenomenon.
EXAMPLE III
The matrix component is an alloy cast steel material, reinforcing elements such as titanium tungsten carbide, chromium, copper, molybdenum, a homogenizing agent and the like are mixed and prefabricated into a particle structure similar to the size of a lost foam bead, the particle structure is formed by cold glue, the particle structure is placed at the working part position in a large hammer mould, matrix molten steel is poured, the pouring temperature is 1600 ℃, and the (Ti, W) C in-situ fusion material is generated, wherein the Mohs hardness of the (Ti, W) C is 9.5, the microhardness is 2.795GPa, the tensile strength is 514MPa, and the impact toughness is 2.8J/cm2Bending strength: n/cm21150; the quenching temperature is 850 ℃ air cooling. The hammerhead is in the shape of a sector 360mm x 100mm x 500mm, the wear-resistant composite layer 360mm x 100mm x 80mm, and the total weight is 96 kilograms.
The hardness of the working part of the hammer head is HRC65, and the working life of the hammer head is prolonged by more than three times compared with the working life of the existing hammer head.
Metallographic analysis was carried out on the bimetallic composite mechanical products produced in the above product examples 1 to 3. And (3) metallographic display: the matrix structure of each product is martensite and a small amount of retained austenite, the carbide hard phase is uniformly distributed, a large amount of (Ti, W) C can be seen on the hard alloy structure and the matrix of the fusion bonding layer around the hard alloy structure, the reinforcing phase is completely wetted by the high-temperature solution, and the metallurgical bonding between the hard alloy material and the matrix material is realized.
The hardness test was performed on the bimetal composite mechanical products produced in the above product examples 1 to 3. Hardness test results show that the hardness of the working part of the bimetal composite process product produced in the embodiment is HRC60-65, the microhardness is 2.795GPa, the reinforcing phase titanium tungsten carbide part keeps the original hardness, the reinforcing phase titanium tungsten carbide part has stronger abrasive material chipping wear resistance, and the service life of the bimetal composite process product can be prolonged by 3-5 times compared with that of a traditional wear-resistant material product.
The bimetal composite product produced by the process has the advantages that the titanium carbide tungsten alloy has super-strong hardness and plays an obvious role in strengthening the matrix, the matrix material tightly and firmly fuses hard alloy particle materials together through the strong martensite structure of the matrix material, the hard alloy particle materials are supported and protected, the hard alloy particle materials and the hard alloy particle materials are complementary, the service life of the product is prolonged, and the production cost is reduced.
Compared with the manufacturing process of embedding the hard alloy prefabricated block in the base material adopted in the prior art, the invention focuses on the characteristics of reducing the interface energy, improving the wettability and the electronegativity of the material by active elements, improving the nucleation force and the in-situ reaction bonding force of crystals, reducing the segregation of an enhanced phase, realizing the uniform distribution of the enhanced phase, and effectively avoiding the phenomena of falling and breaking of the hard phase by the metallurgical bonding of the titanium tungsten carbide enhanced phase and the base material; the invention adopts the high heat preservation and quick solidification process in the production process, so that the base material of the non-reinforced part and the reinforced part form the bimetal composite, the performance requirements of different parts of mechanical parts are met, the in-situ composite technology and the bimetal positioning casting process are combined into a whole, the wear resistance and the application range of the bimetal composite product are improved, and the service life of the bimetal composite product is prolonged.
The invention is an iron-based composite material prepared by a casting method, has low cost (superior to a novel titanium-iron composite hard Alloy material developed by a powder metallurgy process of American Alloy Technology International company), and excellent mechanical property; the invention can be applied to the tool die industry or the field needing high-hardness products, and is a novel high-hardness material with wide application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (8)
1. A process for bimetallic positioned fusion of (Ti, W) Cp/Fe in situ composites, comprising the steps of:
(1) mixing hard phase particles (Ti, W) C and active element particles Cr, Mo and Cu with cold glue, preparing the mixture into particles, pressing the particles into a precast block, and placing the precast block at a specified position;
wherein, the particle size of hard phase particles (Ti, W) C and active element particles Cr, Mo and Cu is 5-10 microns;
(2) pouring the molten base material steel subjected to smelting treatment into the precast block in a negative pressure environment, wherein the pouring temperature is 1600-1650 ℃;
(3) after the pouring is finished, the negative pressure is stopped for 1-2 minutes, the temperature is kept to be not lower than 1550 ℃ within 3 minutes, then the negative pressure is started rapidly to achieve rapid cooling, solidification and quenching, and then the (Ti, W) Cp/Fe in-situ composite material is generated.
2. The (Ti, W) Cp/Fe in situ composite bimetal located fusing process of claim 1, wherein the mass ratio of the hard phase particles (Ti, W) C to the matrix material molten steel is 5-30%.
3. The (Ti, W) Cp/Fe in situ composite bimetal located fusing process of claim 1, wherein the ratio of the density of the hard phase particles (Ti, W) C to the density of the matrix material molten steel is 0.9-1.1.
4. The process for bimetal positioning and fusing of (Ti, W) Cp/Fe in situ composite material as claimed in claim 1, wherein the mass ratio of the active element particles Cr, Mo and Cu to the molten base material is 1-5%, 0.3-0.5% and 0.3-0.5% respectively;
the prefabricated block also comprises an auxiliary agent accounting for 0.3-0.4% of the mass ratio of the matrix material molten steel.
5. The (Ti, W) Cp/Fe in situ composite bimetal positioning fusion process of claim 1, wherein the negative pressure environment in the step (2) is obtained by vacuumizing a closed box body, the precast block is placed at a designated position in a mould, and the mould is placed inside the closed box body;
the base material is cast steel or alloy cast steel.
6. The (Ti, W) Cp/Fe in situ composite bimetal located fusion process of claim 5, wherein the space between the inner wall of the closed box body and the outer side of the mould is filled with the precious pearl sand with low thermal conductivity.
7. A (Ti, W) Cp/Fe in situ composite bimetal located fusion product, which is prepared by applying the (Ti, W) Cp/Fe in situ composite bimetal located fusion process as claimed in any one of claims 1 to 6, wherein the hardness of a working part of the product is HRC60-65, and the microhardness is 2.795 GPa.
8. The (Ti, W) Cp/Fe in situ composite bimetallic position fusion product of claim 7, wherein the product is a railway tamping pick or a mining machinery equipment accessory.
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| JPS58147552A (en) * | 1982-02-25 | 1983-09-02 | Hitachi Metals Ltd | Composite jig and tool material and its manufacture |
| CN103302269B (en) * | 2013-07-11 | 2015-03-25 | 孙岗 | Bimetal complex product and hard alloy melt-casting process thereof |
| CN104209498B (en) * | 2014-07-24 | 2017-02-15 | 昆明理工大学 | Preparing method of interface modification layer of ceramic particle enhanced metal base composite material |
| CN104148621B (en) * | 2014-09-09 | 2016-03-23 | 孙岗 | A kind of bimetallic composite hard alloy particle founding and products thereof |
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Effective date of registration: 20230710 Address after: South West Point, Xiaopo Village, Diao Town, Zhangqiu District, Jinan City, Shandong Province 250000 Patentee after: Shandong Hengsen special equipment Co.,Ltd. Address before: No.12, door 1, 61 / F, Friendship Hotel, Haidian District, Beijing Patentee before: Sun Gang |