CN113857719A - Flux-cored wire for hardfacing of surface of extrusion roller - Google Patents
Flux-cored wire for hardfacing of surface of extrusion roller Download PDFInfo
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- CN113857719A CN113857719A CN202111239062.4A CN202111239062A CN113857719A CN 113857719 A CN113857719 A CN 113857719A CN 202111239062 A CN202111239062 A CN 202111239062A CN 113857719 A CN113857719 A CN 113857719A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
Abstract
The invention belongs to the field of welding materials, and particularly relates to a flux-cored welding wire for hardfacing on the surface of a squeeze roller, which comprises a sheath prepared from a Ti-13Nb-13Zr alloy strip, flux-cored powder and a graphene coating, wherein the flux-cored powder is filled in the sheath, and the graphene coating is uniformly coated on the outer part of the sheath. The powder of the medicine core comprises Fe with nickel plated on the surface50Cr25Mo9C13B315-18% of amorphous alloy particles and Zr plated with nickel on surface65Cu18Ni7Al1015-18% of amorphous alloy particles, 12-16% of CuBe4 intermediate alloy powder, 10-12% of AlV10 intermediate alloy powder and the balance of FZNi-35 self-fluxing alloy powder. The welding wire provided by the invention has the advantages of good corrosion resistance, good conductivity during welding, uniform structure of a surfacing alloy, high hardness, good toughness and strong crack resistance, does not crack in the use process after surfacing on the surface of the squeeze roll, and effectively prolongs the service cycle of the squeeze roll.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a flux-cored welding wire for hardfacing of the surface of a squeeze roller.
Background
Squeeze rolls of cement plants and mills in thermal power plants cannot be used continuously due to local wear and damage in the use process, and the loss is huge. The surfacing technology is a common surface modification and repair method, a flux-cored wire gradually becomes a preferred welding material for hardfacing in recent years, and special alloy is surfacing-welded on the surface of a squeeze roller by the flux-cored wire, so that the hardness of the squeeze roller can be improved, the wear resistance is enhanced, and the service cycle of the squeeze roller is prolonged.
The extrusion roll working process is a rotating dynamic process, a pair of extrusion rolls rotating in opposite directions has a great extrusion effect on intermediate materials, a wear-resistant layer on each extrusion roll is different from sliding wear generally borne, and the wear-resistant layer also bears tangential force action, namely three-body wear, and the biggest problem is that the wear-resistant layer requires high hardness and certain toughness, so that the wear-resistant layer is wear-resistant and is not easy to crack.
The prior hardfacing flux-cored wire has the following problems in surfacing:
(1) the hard phase formed in the deposited metal by surfacing mainly comprises carbide, the hardness is 65HRC at most, and the wear resistance is to be improved; recently, an amorphous surfacing welding technical method is adopted, a large amount of amorphous/nanocrystalline is obtained on a surfacing welding layer, and the hardness of the surfacing welding layer can be improved to 70HRC, such as a wear-resistant and corrosion-resistant iron-based amorphous surfacing welding electrode provided by Chinese patent CN103128463B and a preparation method thereof, a high amorphous nanocrystalline self-protection tubular welding wire provided by Chinese patent CN105499826B and an amorphous structured surfacing flux-cored welding wire provided by Chinese patent CN 102275049A. The form of combining carbide and amorphous alloy effectively improves the hardness of the wear-resistant layer, but has the following problems: although the initial state of the overlaying layer which generates the combination of carbide and a large amount of amorphous/nanocrystalline phases has no cracks, the overlaying layer is easy to crack in the use process (because the hardness is increased and the toughness is reduced), the overlaying layer is partially cracked after being used for a short time after the overlaying of the surfaces of a squeeze roller and the like, and then the overlaying layer is flaky and falls off, so that the service cycle of the wear-resistant layer on the squeeze roller is greatly shortened.
(2) In order to generate carbide hard phase, a carbon source needs to be added into the powder of the flux core, but an electric arc is a moving heat source during welding, the welding process is a process of rapid melting and rapid cooling solidification, the melting rate of carbon source particles in the flux core is difficult to guarantee, the improvement effect of the formed hard phase on the hardness of the wear-resistant surfacing layer is not obvious, and part of carbon source particles which are not melted exist as impurities, so that the fracture effect on the surfacing alloy is generated, and the service cycle of the wear-resistant layer is shortened.
(3) In order to improve production efficiency, generally adopt automatic or semi-automatization welding mode during the build-up welding, require like this that the flux-cored wire must have certain length (lapping), the tubulose welding wire then can't reach this kind of requirement, the seamed flux-cored wire who adopts strap parcel flux-cored powder preparation now more, because to the existence of seam, the unable copper facing in welding wire surface, the problem of existence is: the surface of the welding wire is easy to generate rust, so that the welding wire and the contact tip are in poor contact during welding, the current is suddenly reduced during welding, the structure of a surfacing alloy is uneven, and the wear resistance is seriously influenced.
How to solve the above problems is a critical need for the technicians in this field to work.
Disclosure of Invention
The invention aims to provide a flux-cored welding wire for hardfacing of the surface of a squeeze roller, which solves the following technical problems: firstly, the flux-cored wire has strong corrosion resistance and is in good contact with a contact nozzle during welding; secondly, the alloy after surfacing on the surface of the extrusion roller has high hardness (good wear resistance) and good toughness (good crack resistance); and the extrusion roller has good working performance under high-temperature working conditions.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a squeeze roll is flux-cored welding wire for hardfacing, a serial communication port, including crust, flux-cored powder and graphite alkene coating, the crust is the ring form in perpendicular welding wire length direction's cross-section, the flux-cored powder is filled inside the crust, graphite alkene coating evenly coats outside the crust.
The sheath is prepared from a Ti-13Nb-13Zr alloy strip.
The medicine core powder comprises the following chemical components in percentage by mass: fe with nickel-plated surface50Cr25Mo9C13B3Amorphous alloy particles 15-18% (atom percentage), Zr plated with nickel on surface65Cu18Ni7Al1015-18% of amorphous alloy particles (atomic percent), 12-16% of CuBe4 master alloy powder, 10-12% of AlV10 master alloy powder and the balance of FZNi-35 self-fluxing alloy powder.
The flux-cored powder accounts for 40-45% of the total mass of the welding wire.
The thickness of the graphene coating is 50nm-120nm, preferably 80nm-100 nm.
The diameter of the welding wire is 3.2mm-8.0mm, and preferably 4.0mm-7.0 mm.
Said surface nickel-plated Fe50Cr25Mo9C13B3(atomic percent) the grain diameter of the amorphous alloy grain is 10-20 μm when the amorphous alloy grain is not plated with nickel, and the Zr65Cu18Ni7Al10(atomic percent) the grain diameter of the amorphous alloy grain is 10-20 μm when the amorphous alloy grain is not plated with nickel, and the Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles and Zr65Cu18Ni7Al10(atomic percent) the thickness of the nickel plating layer of the amorphous alloy particles is 0.8-1.2 μm.
Preferably, the particle size of the CuBe4 master alloy powder is 300-400 meshes.
Preferably, the grain diameter of the AlV10 master alloy powder is 300 meshes-400 meshes.
Preferably, the FZNi-35 self-fluxing alloy powder has a particle size of 300 meshes to 400 meshes.
The invention relates to a preparation method of a flux-cored welding wire for hardfacing of the surface of a squeeze roller, which comprises the following steps:
1) selecting materials: controlling the quality and purity according to the raw materials of the chemical components of the medicinal core powder.
2) Powder sieving: mixing Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10The amorphous alloy particles, the CuBe4 intermediate alloy powder, the AlV10 intermediate alloy powder and the FZNi-35 self-fluxing alloy powder are screened by corresponding screens, and the required powder is preserved after screening.
3) Treating the medicinal powder: putting the medicinal powder into an open quartz container, and drying in a drying oven at 100 + -5 deg.C for 1.8-2.5 h.
4) Chemical nickel plating: mixing Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10And (atomic percent) carrying out chemical nickel plating on the amorphous alloy particles.
5) Powder preparation and mixing: the medicine powder is weighed according to the proportion and added into a powder mixing machine to be stirred and mixed to form mixed medicine powder.
6) Rolling a Ti-13Nb-13Zr alloy strip and packaging medicinal powder: placing the Ti-13Nb-13Zr alloy strip on a strip placing device of a flux-cored wire forming machine, manufacturing the Ti-13Nb-13Zr alloy strip into a U-shaped groove by the forming machine, adding the mixed powder obtained in the step 5) into the U-shaped groove, rolling and closing the U-shaped groove by the forming machine to form an O shape, wrapping the powder in the groove, drawing and reducing the diameter by a wire drawing machine channel by channel, and drawing the diameter to 3.2mm-8.0 mm.
7) Coating a graphene coating: and uniformly coating a graphene coating on the surface of the flux-cored wire obtained in the step 6).
The invention has the following beneficial technical effects:
1. the structure of the surfacing alloy is uniform: the surface of the welding wire has strong corrosion resistance, and the welding wire is in good contact with a contact tip during welding, so that the stability of welding current is ensured, and the structure of a surfacing alloy is uniform.
2. The hardness of the surfacing alloy is high: the graphene coating and the Ti-13Nb-13Zr outer skin are completely melted, so that an unmelted carbon source does not exist in the surfacing alloy, the surfacing alloy is not subjected to a splitting effect, and the surfacing alloy has good toughness. In addition, the nano-level graphene is combined with other atoms after being melted, so that the graphene canGenerating carbide hard phases of uniformly distributed nano-scale titanium carbide, niobium carbide, zirconium carbide, vanadium carbide and the like; ② Fe during overlaying50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10The nickel-plated layer is set on the surface of amorphous alloy particle, so that it is slow in melting, and the heat input of electric arc is moved, after the nickel-plated layer is melted, the two kinds of amorphous particles can be partially melted to produce solidification of molten pool, so that the amorphous particles can be converted into the mixture of amorphous and nano crystal, and uniformly distributed in the surfacing alloy. The carbide and the amorphous alloy are combined and uniformly distributed, so that the hardness of the surfacing alloy is effectively improved.
3. The surfacing alloy has good toughness and does not crack in the using process: CuBe4 intermediate alloy powder, AlV10 intermediate alloy powder and FZNi-35 form crystals after being melted from the surface layer of the alloy powder and the matrix, carbide, amorphous/nanocrystalline and the crystals are uniformly distributed and combined together, and the existence of copper, beryllium, aluminum, vanadium, nickel, niobium, zirconium and titanium elements greatly improves the toughness and crack resistance of the surfacing alloy; although the heat input value is small during surfacing, the CuBe4 intermediate alloy powder, the AlV10 intermediate alloy powder and the FZNi-35 self-fluxing alloy powder with low melting points are adopted, so that the three alloy powders can be completely melted, the phenomenon that part of particles are not melted and solidified and then exist as inclusions is avoided, and the toughness and the crack resistance of the surfacing alloy are improved.
4. The extrusion roller has good working performance under high-temperature working conditions: after the squeeze roll works for a period of time, the heat is generated under the action of friction, the temperature of the wear-resistant surfacing layer is increased, and the service performance of a common wear-resistant layer is reduced. Because the Ti-13Nb-13Zr outer skin and the FZNi-35 self-fluxing alloy powder are adopted, the surfacing alloy has good high-temperature resistance, the phenomenon of mechanical property reduction can not occur, and the service cycle of the extrusion roller is long.
5. The surfacing alloy provided by the invention has the advantages of uniform structure, high hardness, good toughness and strong crack resistance, does not crack in the use process after surfacing on the surface of the squeeze roller, and effectively prolongs the service cycle of the squeeze roller. Experiments show that: the minimum hardness of the surfacing alloy is 70HRC, the minimum value of the impact absorption energy is 22J (generally not more than 15J), the service cycle of each 1mm wear-resistant layer of the squeeze roller is increased to 820h (generally not more than 200h), and the service cycle of the squeeze roller is effectively prolonged.
Drawings
FIG. 1 is a cross-sectional view of a flux-cored wire for hardfacing of squeeze rolls in a direction perpendicular to the length direction.
In the figure: 1. a skin; 2. powder of the medicine core; 3. and (4) coating graphene.
Detailed Description
The invention is further illustrated by the following examples, without restricting its scope to the specific embodiments.
Example 1:
the utility model provides a squeeze roll hardfacing flux-cored welding wire, includes crust, flux-cored powder and graphite alkene coating, and the crust is the ring form in perpendicular welding wire length direction's cross-section, and the flux-cored powder is filled inside the crust, and graphite alkene coating evenly coats outside the crust.
The sheath is prepared by Ti-13Nb-13Zr alloy strip.
The medicine core powder comprises the following chemical components in percentage by mass: fe with nickel-plated surface50Cr25Mo9C13B3Amorphous alloy particles 15-18% (atom percentage), Zr plated with nickel on surface65Cu18Ni7Al1015 percent of amorphous alloy particles, 12 percent of CuBe4 master alloy powder, 10 percent of AlV10 master alloy powder and the balance of FZNi-35 self-fluxing alloy powder.
The flux-cored powder accounts for 40% of the total mass of the welding wire.
The thickness of the graphene coating is 50 nm.
The diameter of the wire is 3.2 mm.
Fe with nickel-plated surface50Cr25Mo9C13B3(atomic percent) the grain diameter of the amorphous alloy grain is 10-20 mu m when the amorphous alloy grain is not plated with nickel, Zr65Cu18Ni7Al10(atomic percent) the grain diameter of the amorphous alloy grain is 10-20 mu m when the amorphous alloy grain is not plated with nickel, and Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles and Zr65Cu18Ni7Al10(atomic%) the thickness of the nickel plating layer of the amorphous alloy particles was 0.8. mu.m.
The particle size of the CuBe4 master alloy powder is 300 meshes-400 meshes.
The grain diameter of the AlV10 master alloy powder is 300 meshes-400 meshes.
The grain size of the FZNi-35 self-fluxing alloy powder is 300 meshes to 400 meshes.
The invention relates to a preparation method of a flux-cored welding wire for hardfacing of the surface of a squeeze roller, which comprises the following steps:
1) selecting materials: controlling the quality and purity according to the raw materials of the chemical components of the medicinal core powder.
2) Powder sieving: mixing Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10The amorphous alloy particles, the CuBe4 intermediate alloy powder, the AlV10 intermediate alloy powder and the FZNi-35 self-fluxing alloy powder are screened by corresponding screens, and the required powder is preserved after screening.
3) Treating the medicinal powder: putting the medicinal powder into an open quartz container, and then placing the container in a drying oven for drying at 100 +/-5 ℃ for 1.8 h.
4) Chemical nickel plating: mixing Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10And (atomic percent) carrying out chemical nickel plating on the amorphous alloy particles.
5) Powder preparation and mixing: the medicine powder is weighed according to the proportion and added into a powder mixing machine to be stirred and mixed to form mixed medicine powder.
6) Rolling a Ti-13Nb-13Zr alloy strip and packaging medicinal powder: placing the Ti-13Nb-13Zr alloy strip on a strip placing device of a flux-cored wire forming machine, manufacturing the Ti-13Nb-13Zr alloy strip into a U-shaped groove by the forming machine, adding the mixed powder obtained in the step 5) into the U-shaped groove, rolling and closing the U-shaped groove by the forming machine to form an O shape, wrapping the powder in the groove, drawing and reducing the diameter by drawing machine channel by channel, and drawing the diameter to 3.2 mm.
7) Coating a graphene coating: and uniformly coating a graphene coating on the surface of the flux-cored wire obtained in the step 6).
Example 2:
the utility model provides a squeeze roll hardfacing flux-cored welding wire, includes crust, flux-cored powder and graphite alkene coating, and the crust is the ring form in perpendicular welding wire length direction's cross-section, and the flux-cored powder is filled inside the crust, and graphite alkene coating evenly coats outside the crust.
The sheath is prepared by Ti-13Nb-13Zr alloy strip.
The medicine core powder comprises the following chemical components in percentage by mass: fe with nickel-plated surface50Cr25Mo9C13B3Amorphous alloy particle 16.5% (atomic percentage), Zr with nickel plated surface65Cu18Ni7Al1016.5 percent of amorphous alloy particles, 14 percent of CuBe4 master alloy powder, 11 percent of AlV10 master alloy powder and the balance of FZNi-35 self-fluxing alloy powder.
The flux-cored powder accounts for 42.5 percent of the total mass of the welding wire.
The thickness of the graphene coating is 90 nm.
The diameter of the wire is 5.0 mm.
Fe with nickel-plated surface50Cr25Mo9C13B3(atomic percent) the grain diameter of the amorphous alloy grain is 10-20 mu m when the amorphous alloy grain is not plated with nickel, Zr65Cu18Ni7Al10(atomic percent) the grain diameter of the amorphous alloy grain is 10-20 mu m when the amorphous alloy grain is not plated with nickel, and Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles and Zr65Cu18Ni7Al10(atomic percent) the thickness of the nickel plating layer of the amorphous alloy particles was 1.0. mu.m.
The particle size of the CuBe4 master alloy powder is 300 meshes-400 meshes.
The grain diameter of the AlV10 master alloy powder is 300 meshes-400 meshes.
The grain size of the FZNi-35 self-fluxing alloy powder is 300 meshes to 400 meshes.
The invention relates to a preparation method of a flux-cored welding wire for hardfacing of the surface of a squeeze roller, which comprises the following steps:
1) selecting materials: controlling the quality and purity according to the raw materials of the chemical components of the medicinal core powder.
2) Powder sieving: mixing Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10The amorphous alloy particles, the CuBe4 intermediate alloy powder, the AlV10 intermediate alloy powder and the FZNi-35 self-fluxing alloy powder are screened by corresponding screens, and the required powder is preserved after screening.
3) Treating the medicinal powder: putting the medicinal powder into an open quartz container, and drying in a drying oven at 100 + -5 deg.C for 1.8-2.5 h.
4) Chemical nickel plating: mixing Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10And (atomic percent) carrying out chemical nickel plating on the amorphous alloy particles.
5) Powder preparation and mixing: the medicine powder is weighed according to the proportion and added into a powder mixing machine to be stirred and mixed to form mixed medicine powder.
6) Rolling a Ti-13Nb-13Zr alloy strip and packaging medicinal powder: placing the Ti-13Nb-13Zr alloy strip on a strip placing device of a flux-cored wire forming machine, manufacturing the Ti-13Nb-13Zr alloy strip into a U-shaped groove by the forming machine, adding the mixed powder obtained in the step 5) into the U-shaped groove, rolling and closing the U-shaped groove by the forming machine to form an O shape, wrapping the powder in the groove, drawing and reducing the diameter by drawing machine channel by channel, and drawing the diameter to 5.0 mm.
7) Coating a graphene coating: and uniformly coating a graphene coating on the surface of the flux-cored wire obtained in the step 6).
Example 3:
the utility model provides a squeeze roll hardfacing flux-cored welding wire, includes crust, flux-cored powder and graphite alkene coating, and the crust is the ring form in perpendicular welding wire length direction's cross-section, and the flux-cored powder is filled inside the crust, and graphite alkene coating evenly coats outside the crust.
The sheath is prepared by Ti-13Nb-13Zr alloy strip.
The medicine core powder comprises the following chemical components in percentage by mass: fe with nickel-plated surface50Cr25Mo9C13B318% of amorphous alloy particles (atomic percentage) and Zr plated with nickel on the surface65Cu18Ni7Al10The alloy comprises (by atom percent) amorphous alloy particles 18%, CuBe4 intermediate alloy powder 16%, AlV10 intermediate alloy powder 12%, and the balance of FZNi-35 self-fluxing alloy powder.
The flux-cored powder accounts for 45 percent of the total mass of the welding wire.
The thickness of the graphene coating was 120 nm.
The diameter of the wire is 8.0 mm.
Fe with nickel-plated surface50Cr25Mo9C13B3(atomic percent) the grain diameter of the amorphous alloy grain is 10-20 μm when the amorphous alloy grain is not plated with nickel, and the Zr65Cu18Ni7Al10(atomic percent) the grain diameter of the amorphous alloy grain is 10-20 μm when the amorphous alloy grain is not plated with nickel, and the Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles and Zr65Cu18Ni7Al10(atomic percent) the thickness of the nickel plating layer of the amorphous alloy particles was 1.2. mu.m.
The particle size of the CuBe4 master alloy powder is 300 meshes-400 meshes.
The grain diameter of the AlV10 master alloy powder is 300 meshes-400 meshes.
The grain size of the FZNi-35 self-fluxing alloy powder is 300 meshes to 400 meshes.
The invention relates to a preparation method of a flux-cored welding wire for hardfacing of the surface of a squeeze roller, which comprises the following steps:
1) selecting materials: controlling the quality and purity according to the raw materials of the chemical components of the medicinal core powder.
2) Powder sieving: mixing Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10The amorphous alloy particles, the CuBe4 intermediate alloy powder, the AlV10 intermediate alloy powder and the FZNi-35 self-fluxing alloy powder are screened by corresponding screens, and the required powder is preserved after screening.
3) Treating the medicinal powder: putting the medicinal powder into an open quartz container, and then placing the container in a drying oven for drying at 100 +/-5 ℃ for 1.8 h.
4) Chemical nickel plating: mixing Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10And (atomic percent) carrying out chemical nickel plating on the amorphous alloy particles.
5) Powder preparation and mixing: the medicine powder is weighed according to the proportion and added into a powder mixing machine to be stirred and mixed to form mixed medicine powder.
6) Rolling a Ti-13Nb-13Zr alloy strip and packaging medicinal powder: placing the Ti-13Nb-13Zr alloy strip on a strip placing device of a flux-cored wire forming machine, manufacturing the Ti-13Nb-13Zr alloy strip into a U-shaped groove by the forming machine, adding the mixed powder obtained in the step 5) into the U-shaped groove, rolling and closing the U-shaped groove by the forming machine to form an O shape, wrapping the powder in the groove, drawing and reducing the diameter by a wire drawing machine channel by channel, and drawing the diameter to 8.0 mm.
7) Coating a graphene coating: and uniformly coating a graphene coating on the surface of the flux-cored wire obtained in the step 6).
Comparative example 1:
essentially the same as example 2, except that there is no outermost graphene coating.
Comparative example 2:
essentially the same as example 2, except that there is no outermost graphene coating, but a corresponding mass of graphite powder is added to the core powder.
Comparative example 3:
essentially the same as example 2, except that the outermost coating was a graphite coating.
Comparative example 4:
basically the same as example 2 except that the Ti-13Nb-13Zr alloy outer skin was changed to a low-carbon cold-rolled steel strip.
Comparative example 5:
substantially the same as example 2 except that Fe in the powder of the core is added50Cr25Mo9C13B3(atomic%) amorphous alloy particles, Zr65Cu18Ni7Al10The surface of the amorphous alloy particles (atomic percentage) is not plated with nickel.
Comparative example 6:
essentially the same as example 2, except that the core powder is free of surface nickel plated Fe50Cr25Mo9C13B3(atomic%) amorphous alloy particles.
Comparative example 7:
substantially the same as example 2 except that no surface nickel-plated Zr was contained in the powder of the core65Cu18Ni7Al10(atomic%) amorphous alloy particles.
Comparative example 8:
essentially the same as example 2, except that the core powder is free of surface nickel plated Fe50Cr25Mo9C13B3(atomic percent) amorphous alloy particles, and Zr without surface nickel plating65Cu18Ni7Al10(atomic%) amorphous alloy particles.
Comparative example 9:
essentially the same as example 2, except that the powder core does not contain a CuBe4 master alloy powder.
Comparative example 10:
the process was substantially the same as in example 2 except that the CuBe4 master alloy powder in the powder core was replaced by copper powder and beryllium powder of the respective masses.
Comparative example 11:
essentially the same as example 2, except that the core powder was free of AlV10 master alloy powder.
Comparative example 12:
basically the same as example 2, except that the AlV10 master alloy powder in the powder core was changed to aluminum powder and vanadium powder of the corresponding mass.
Comparative example 13:
the same as example 2, except that FZNi-35 in the powder core was changed from the alloy powder to nickel powder, chromium powder, boron powder, and silicon powder of the corresponding mass.
Comparative example 14:
substantially the same as in example 2 except that FZNi-35 in the cored powder was changed from the alloyed powder to a reduced iron powder of the corresponding mass.
The flux-cored wires obtained in the examples and the comparative examples are used for surface overlaying of squeeze rollers, the welding current is 120A-130A, the welding voltage is 25-28V, and the welding speed is 1.3-1.4 mm/s.
The flux-cored wires obtained in the examples and the comparative examples are used for surfacing of the surface of a Q235 plate, and a Q235 plate layer is planed after welding, and the surfacing layer is left to be manufactured into an impact test sample.
And measuring the hardness and the impact absorption energy of the overlaying layer, observing the uniformity of a metallographic structure, and carrying out a production working condition abrasion experiment on the extrusion roller subjected to overlaying. Examples and comparative examples 10 experiments were performed for each example and the average of 10 results was taken.
The results of the examples and comparative examples are shown in Table 1.
TABLE 1
Note: the service time of the wear-resistant layer refers to the service time of the extrusion roller during production after the wear-resistant alloy is deposited.
From the comparative examples and examples it can be seen that:
1) the flux-cored wire prepared by the technical scheme of the invention has the advantages of uniform structure of surfacing alloy, high hardness, good toughness and strong crack resistance, does not crack in the use process after surfacing on the surface of the squeeze roller, and has long service time of a wear-resistant layer of the squeeze roller.
2) The outermost layer of the comparative example 1 is free of a graphene coating, the corrosion resistance is poor, the conductivity is poor during welding, the structure of a surfacing alloy is uneven, the surfacing layer is poor in hardness and good in toughness due to the fact that no carbon source exists, and although the surfacing layer is not prone to cracking in the use process after surfacing on the surface of the squeeze roller, the wear-resistant layer of the squeeze roller is short in service time due to the fact that the hardness is low.
3) The outermost layer of the comparative example 2 is free of a graphene coating, the corrosion resistance is poor, the conductivity is poor during welding, the structure of a surfacing alloy is uneven, a carbon source exists in powder of a medicine core, the carbon source cannot be completely melted, the hardness of the surfacing layer is high, the toughness is reduced, the surfacing layer is easy to crack in the using process after surfacing on the surface of the extrusion roller, and the service time of a wear-resistant layer of the extrusion roller is short.
4) Comparative examples 3 to 14 all change some technical characteristics of the invention, some have large hardness reduction and some have poor toughness, and are easy to crack in the using process after surfacing welding on the surface of the extrusion roll, and the service time of the wear-resistant layer of the extrusion roll is short. The technical characteristics of all parts of the invention are mutually supported and matched to achieve the beneficial effect of the invention.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. The flux-cored welding wire for the hardfacing of the surface of the squeeze roller is characterized by comprising a sheath (1), flux-cored powder (2) and a graphene coating (3), wherein the cross section of the sheath (1) in the direction perpendicular to the length direction of the welding wire is in a circular ring shape, the flux-cored powder (2) is filled in the sheath (1), and the graphene coating (3) is uniformly coated outside the sheath (1);
the sheath (1) is prepared from a Ti-13Nb-13Zr alloy strip;
the medicine core powder (2) comprises the following chemical components in percentage by mass: fe with nickel-plated surface50Cr25Mo9C13B315% -18% of amorphous alloy particles and Zr plated with nickel on surface65Cu18Ni7Al1015-18% of amorphous alloy particles, 12-16% of CuBe4 intermediate alloy powder, 10-12% of AlV10 intermediate alloy powder and the balance of FZNi-35 self-melting alloy powderAnd (3) alloy powder.
2. The flux-cored welding wire for hardfacing on the surfaces of the squeeze rollers according to claim 1, wherein the flux-cored powder (2) accounts for 40-45% of the total mass of the welding wire.
3. Flux-cored wire for hardfacing of squeeze roll surfaces according to claim 1, characterized in that the thickness of the graphene coating (3) is 50-120 nm, preferably 80-100 nm.
4. The flux-cored welding wire for squeeze roll hardfacing according to claim 1, wherein a diameter of the wire is 3.2mm to 8.0mm, preferably 4.0mm to 7.0 mm.
5. The flux-cored welding wire for hardfacing of the surfaces of squeeze rollers of claim 1, wherein the surface is nickel-plated Fe50Cr25Mo9C13B3The grain diameter of the amorphous alloy grain is 10-20 μm when the amorphous alloy grain is not plated with nickel, and the Zr65Cu18Ni7Al10The grain diameter of the amorphous alloy grain is 10-20 μm when the amorphous alloy grain is not plated with nickel, and the Fe50Cr25Mo9C13B3Amorphous alloy particles and Zr65Cu18Ni7Al10The thickness of the nickel plating layer of the amorphous alloy particles is 0.8-1.2 μm.
6. The flux-cored welding wire for hardfacing of the surfaces of squeeze rollers according to claim 1, wherein the particle size of the CuBe4 master alloy powder is 300-400 mesh.
7. The flux-cored welding wire for hardfacing of the surfaces of squeeze rollers according to claim 1, wherein the grain size of the AlV10 master alloy powder is 300-400 mesh.
8. The flux-cored welding wire for hardfacing of the surfaces of squeeze rollers of claim 1, wherein the FZNi-35 self-fluxing alloy powder has a particle size of 300 to 400 mesh.
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