CN111321356A - Laser additive manufacturing sink roller composite shaft sleeve and preparation method thereof - Google Patents
Laser additive manufacturing sink roller composite shaft sleeve and preparation method thereof Download PDFInfo
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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- C22C27/06—Alloys based on chromium
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
Abstract
The invention relates to a laser additive manufacturing sink roll composite shaft sleeve and a preparation method thereof, wherein the shaft sleeve comprises a sink roll shaft sleeve body and an abrasion-resistant and corrosion-resistant surface layer, and the abrasion-resistant and corrosion-resistant surface layer covers the sink roll shaft sleeve bodyKUGreater than 65J/cm2(ii) a The surface layer of the sink roll composite shaft sleeve prepared by the method is high in hardness, and the hardness is more than 1250 HV; the surface layer of the sink roll composite shaft sleeve prepared by the invention has excellent zinc liquid corrosion and abrasion resistance, and the service life of the sink roll composite shaft sleeve is more than 45 days and is greatly prolonged compared with a 316L stainless steel sink roll shaft sleeve in a zinc liquid corrosion environment at 480 ℃.
Description
Technical Field
The invention belongs to the technical field of sink rolls, and particularly relates to a laser additive manufacturing sink roll composite shaft sleeve and a preparation method thereof.
Background
At present, 80 wide strip steel continuous galvanizing lines are introduced from abroad by domestic large-scale steel enterprises, the production lines have the characteristics of advanced equipment, high yield, high product grade and the like, and a sink roll device is important equipment in a continuous hot galvanizing production line. The sink roll works in the zinc plating solution at the temperature of about 460 ℃, whether the sink roll can stably run for a long time or not is judged, and the quality and the qualified rate of galvanized products are greatly influenced. In order to ensure the safe use of the sink roll, the shaft sleeves are assembled at the two ends of the sink roll, and the shaft sleeves and the bearing bushes of the sink roll need to have the following characteristics: the coating resists corrosion of zinc liquid, resists abrasion and has low friction coefficient.
In order to improve the performance of the sink roll shaft sleeve, chinese patent CN108018511A discloses a high wear-resistant sink roll shaft sleeve and a preparation method thereof, which mainly solve the technical problems of low shaft sleeve hardness and poor high temperature and wear resistance in the use process in the prior art. The invention relates to a high-wear-resistance sink roller shaft sleeve which consists of a stainless steel substrate and a cobalt-based overlaying layer, wherein the cobalt-based overlaying layer is welded on the surface of the stainless steel substrate, the thickness of the cobalt-based overlaying layer is 2.0-4.0mm, and the cobalt-based overlaying layer comprises the following chemical components in percentage by weight: 10.0 to 14.0 percent of Co10, 1.5 to 2.0 percent of C, 27 to 30 percent of Cr, 8 to 12 percent of W, less than or equal to 1.5 percent of Si, less than or equal to 1 percent of B, and the balance of Fe and inevitable impurities. The Chinese invention patent CN 107630168A also discloses a sink roll shaft sleeve, which comprises the following components: 0.24-0.45% of C, 0.60-2.0% of Mn0.80-1.10% of Si, 0.02-0.12% of Zr0.02, 0.035-0.080% of Al, 2.7-3.5% of Cr2, 0.75-1.60% of Ni0.02-0.03% of Y, 0.5-2.5% of Mo0.03-0.55% of Nb0.03, 2.5-3.3% of B, 0.003-0.01% of N, less than 0.035% of P, less than 0.045% of S and the balance of Fe. The sinking roller shaft is sleeved on the basis of low-carbon high-speed steel, and boron is added, so that the sinking roller shaft has excellent zinc liquid corrosion resistance on the premise of keeping the high-speed steel to have good high-temperature red hardness. In addition, the invention also adds proper amount of yttrium, magnesium, calcium, titanium, niobium and potassium, which mainly plays the roles of deoxidation, desulfurization, tissue refinement and inclusion morphology and distribution improvement, and is beneficial to improving the mechanical property of the sink roll shaft sleeve, in particular the toughness of the sink roll shaft sleeve.
The chinese invention patent CN106282810A also discloses an alloy for a sink roll shaft sleeve, which comprises the following components by mass percent: molybdenum: 7.2-10.5%, titanium: 3.3-5.7%, zirconium: 2.9 to 4.4%, hafnium: 0.8 to 2.2%, niobium: 1.7-2.5%, silicon: 1.2-2.1%, carbon: 1.4-3.0%, less than 0.02% of phosphorus, less than 0.02% of sulfur and the balance of iron. China utility model zl201721497221.x has still announced a wear-resisting type sink roll axle sleeve, including the axle sleeve body, axle sleeve body opening one side be provided with connecting flange, the opposite side is provided with the arch, axle sleeve body inner wall intermediate position is provided with first bush and second bush, first bush and second bush set up the mode of dog through both sides respectively and this body coupling of axle sleeve fixed, wherein first bush and second bush and axle sleeve body centre are provided with the graphite gasket respectively, axle sleeve body surface be provided with straight shape slot, straight shape slot and annular groove communicate with each other. The utility model discloses a be provided with the graphite gasket in the middle of bush and the axle sleeve body, prevent that bush and axle sleeve from producing the crackle because of the zinc liquid adhesion in the use, axle sleeve body surface is provided with straight shape slot moreover, straight shape slot and annular groove communicate with each other, prevent that the zinc dross from stifled commentaries on classics.
The Chinese invention patent CN103233173A also discloses a sink roll shaft sleeve and a preparation method thereof, belonging to the technical field of corrosion and wear resistant materials. The chemical components of the sinking roller sleeve material are (mass fraction): 0.10-0.25C,2.0-3.0B,16.0-18.0Mn,2.0-3.5Cr,0.15-0.30N, S <0.03, P <0.03, and Fe in balance. The shaft sleeve material can be produced by an electric furnace, has the characteristics of high hardness and strength, good toughness, corrosion resistance and wear resistance and the like, and is simple and convenient in manufacturing process and low in production cost. The shaft sleeve material can obviously improve the operation rate of a hot galvanizing production line and has good economic benefit. The Chinese invention patent CN102851597A also discloses an abrasion-resistant sink roller shaft sleeve and a manufacturing method thereof, and the specific components and mass percentages are as follows: 0.15-0.28C, 3.0-3.5B, 2.0-2.5Cr, 9.5-10.0W, 2.5-3.0Mo, 0.65-0.80Al, 1.20-1.50Si, 0.25-0.50Mn, 0.04-0.08Y, 0.06-0.10Ti, 0.06-0.10Nb, 0.03-0.06Ca, 0.05-0.08Mg, 0.08-0.12K, S <0.04, P < 0.05, and the balance Fe. The abrasion-resistant sink roll shaft sleeve is formed by smelting in an electric furnace and adopting a casting method, and is subjected to finish machining after quenching and tempering. The Chinese invention patent CN102128208A also discloses a preparation method of the sink roll shaft sleeve with high bonding strength. The stainless steel and the ceramic matrix are connected by ceramic surface metallization and brazing technology. The main procedures are as follows: 1. metallizing the surface of the ceramic; 2. and adopting Co-based brazing filler metal to braze and connect the ceramic and stainless steel basal bodies. The Co-based brazing filler metal contains Co, Si, Cu, Cr, B, W, C and a binder, and the raw materials can be simple substance powder, alloy or compound, and can also be the combination of the materials; the binder may be an inorganic substance, and also a part of additives and auxiliaries. The preparation method of the high-bonding-strength shaft sleeve has the advantages that: the bonding strength of the ceramic and the metal is high, the thickness of the molten zinc corrosion resistant layer can reach more than 2mm, and the high-temperature zinc liquid corrosion resistant service life is greatly prolonged; the manufacturing method has strong adaptability, simple and convenient operation, strong standardization, lower production cost and great practical value. Chinese patent ZL201420009202.8 also discloses a hot galvanizing device part, and particularly relates to a sink roller shaft sleeve, which comprises a hollow sink roller shaft sleeve main body in the axial direction, wherein the inner surface and the outer surface of the sink roller shaft sleeve main body are both welded with corrosion-resistant hardened layers taking WC or/and MoB as hard phases. The utility model discloses a beneficial effect is: on the inner surface and the outer surface of the main body of the sink roller shaft sleeve, cobalt base is used as bonding metal, and a corrosion-resistant hardened layer which takes WC and MoB as hard phases is welded, so that the red hardness of the surface of the roller body is ensured, the roller body has super-strong wear resistance, and the WC and MoB have stable chemical properties and have no chemical corrosion with zinc liquid, thereby prolonging the service life of the sink roller shaft sleeve.
At present, the invention fails to well solve the problems that the sink roll shaft sleeve needs to simultaneously have wear resistance and corrosion resistance, and the shaft sleeve body needs to have good high-temperature toughness so as to ensure the use safety of the shaft sleeve.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a sink roll composite shaft sleeve manufactured by laser additive and a preparation method thereof.
The invention provides a composite shaft sleeve of a sink roller manufactured by laser additive manufacturing, which comprises a sink roller shaft sleeve body and an anti-wear and anti-corrosion surface layer, wherein the anti-wear and anti-corrosion surface layer covers the sink roller shaft sleeve body.
The sink roll shaft sleeve body has good high-temperature toughness, and the wear-resistant and corrosion-resistant surface layer has the performance of resisting zinc liquid corrosion and wear.
Further, the chemical composition and the mass fraction of the material of the sink roll sleeve body comprise 0.30-0.43% of C, 22.15-22.83% of Cr, 8.06-8.51% of Ni, 0.03-0.06% of Ce, 0.02-0.05% of N, 5.40-5.79% of Mo, 2.64-2.88% of Al, 12.18-12.53% of Nb, 3.21-3.46% of Si, 0.27-0.41% of Mn, < 0.025% of P, < 0.020% of S, and the balance of Fe and other inevitable impurities.
According to the invention, 5.40-5.79% of Mo, 2.64-2.88% of Al, 12.18-12.53% of Nb and 3.21-3.46% of Si are added into the shaft sleeve body material, so that the high-temperature strength of the body material can be greatly improved. The addition of 22.15-22.83% of Cr and 2.64-2.88% of Al can obviously improve the zinc liquid corrosion resistance of the bulk material. Adding 8.06-8.51% of Ni, 0.03-0.06% of Ce and 0.02-0.05% of N can obviously improve the high-temperature toughness of the bulk material.
Furthermore, the chemical composition and the mass fraction of the wear-resistant and corrosion-resistant surface layer material comprise 18.03-18.77% of B, 28.17-28.60% of Cr, 16.45-16.92% of Co, 9.75-10.66% of W, 0.75-0.89% of Y, 2.17-2.30% of C and 23.21-23.74% of Ni.
Wherein, the addition of 18.03-18.77% of B, 28.17-28.60% of Cr, 16.45-16.92% of Co and 0.75-0.89% of Y can greatly improve the anti-corrosion capability of zinc liquid on the surface layer. 9.75-10.66% of W and 2.17-2.30% of C are added to generate fine WC particles, the high-temperature wear resistance of the surface layer is greatly improved, and the B and the W are combined to generate high-hardness W2And B, the high-temperature wear resistance of the surface layer is also improved. The addition of Y in 0.75-0.89% and Ni in 23.21-23.74% can raise the strength and toughness of the surface layer and prevent the surface layer from cracking and peeling off during high temperature use.
The second purpose of the invention is to provide a preparation method of the sink roll composite shaft sleeve by laser additive manufacturing, which comprises the following steps:
(1) smelting the sink roll shaft sleeve body into molten metal, casting into a sink roll composite shaft sleeve body blank, continuously heating, carrying out heat preservation treatment, cooling the furnace to the temperature lower than 150 ℃, taking the sink roll shaft sleeve body out of the furnace, air-cooling to room temperature, and roughly processing to obtain the sink roll composite shaft sleeve body;
(2) covering the wear-resistant and corrosion-resistant surface layer on the outer surface of the sink roll composite shaft sleeve body obtained in the step (1) by adopting a laser cladding additive manufacturing method, and performing laser cladding and finish machining to specified size and precision to obtain the laser additive manufactured sink roll composite shaft sleeve.
Further, the temperature of the molten metal when the blank of the composite shaft sleeve body of the sink roll is poured is 1564-1578 ℃.
The composite shaft sleeve body blank of the sink roll is poured by adopting the temperature, the structure is compact, and the casting defects are few.
Further, the heating is continued to 600-650 ℃ in the step (1), and the temperature is kept for 3-4 h.
Further, in the step (1), the temperature is continuously heated to 625 ℃, and the temperature is kept for 3.5 hours.
In order to prevent the composite shaft sleeve body from deforming or cracking due to overlarge stress in use, the blank of the composite shaft sleeve body of the sink roll is heated to 600-650 ℃, the blank is insulated for 3-4 hours, then the blank is cooled to a temperature lower than 150 ℃, and is taken out of a furnace for air cooling to room temperature, stress relief annealing treatment is carried out, and then rough machining is carried out, so as to obtain the composite shaft sleeve body of the sink roll.
Further, the method for casting the sink roll composite shaft sleeve body blank in the step (1) is lost foam casting or investment casting.
The sinking roller shaft composite sleeve body is processed by adopting a lost foam casting method or an investment casting method, so that the efficiency is high and the cost is low. In addition, the molten metal of the sink roll composite shaft sleeve body material is smelted in the medium-frequency induction electric furnace, so that the melting efficiency is high, and the temperature and the components are easy to control.
Further, laser cladding of the wear-resistant and corrosion-resistant surface layer with the unilateral thickness of 3.2-3.6mm in the step (2).
Further, the parameters of the laser cladding additive manufacturing method in the step (2) are 3800-.
By adopting the parameters in the laser cladding additive manufacturing method, the cladding surface layer can be ensured to have no defects such as air holes, cracks and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) laser additive manufacturing prepared by the inventionThe sink roll composite shaft sleeve body has good high-temperature toughness, the tensile strength at 500 ℃ is more than 850MPa, and the impact toughness is αKUGreater than 65J/cm2；
(2) The surface layer of the sink roll composite shaft sleeve prepared by the method is high in hardness, and the hardness is more than 1250 HV; the surface layer of the sink roll composite shaft sleeve prepared by the method has excellent zinc liquid corrosion wear resistance, and the service life of the sink roll composite shaft sleeve is longer than 45 days in a zinc liquid corrosion environment at 480 ℃, and is greatly prolonged compared with a 316L stainless steel sink roll shaft sleeve;
(3) the preparation method disclosed by the invention is strong in adaptability, simple to operate and popularize and apply, and the shaft sleeve prepared by the invention can improve the operation rate of a hot galvanizing unit, reduce the labor intensity of workers, improve the surface quality of a hot galvanizing steel plate and has good economic and social benefits;
(4) according to the invention, the sink roller shaft sleeve is prepared from the material components in a specific proportion, the microstructure is more compact compared with the existing shaft sleeve, the mechanical property is excellent, the sink roller shaft sleeve is durable, and the long-time stable operation of the sink roller can be effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a composite shaft sleeve of a laser additive manufacturing sink roll according to the present invention;
reference numerals
1-sinking the shaft sleeve body of the roller; 2-abrasion-resistant and corrosion-resistant surface layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1
The composite shaft sleeve for the sink roller manufactured by the laser additive manufacturing method comprises a sink roller shaft sleeve body 1 and an anti-wear and anti-corrosion surface layer 2, wherein the anti-wear and anti-corrosion surface layer 2 covers the sink roller shaft sleeve body 1.
The chemical composition and mass fraction of the material of the sink roll sleeve body 1 comprise 0.30% of C, 22.83% of Cr, 8.06% of Ni, 0.06% of Ce, 0.02% of N, 5.79% of Mo, 2.64% of Al, 12.53% of Nb, 3.21% of Si, 0.41% of Mn, 0.022% of P, 0.019% of S, and the balance of Fe and other unavoidable impurities. The chemical composition and the mass fraction of the wear-resistant and corrosion-resistant surface layer 2 material comprise 18.03 percent of B, 28.60 percent of Cr, 16.45 percent of Co, 10.66 percent of W, 0.75 percent of Y, 2.30 percent of C and 23.21 percent of Ni.
The preparation method of the composite shaft sleeve of the sink roller by laser additive manufacturing comprises the following steps:
(1) smelting the sink roll shaft sleeve body into molten metal in a 500 kg medium frequency induction electric furnace, when the temperature of the molten metal reaches 1564 ℃, pouring the molten metal into a sink roll composite shaft sleeve body blank by adopting a lost foam casting method, continuously heating the blank to 600 ℃, carrying out heat preservation treatment for 4 hours, cooling the blank in the furnace to the temperature of less than 150 ℃, discharging the blank out of the furnace, carrying out air cooling to the room temperature, and carrying out rough machining to obtain a sink roll composite shaft sleeve body 1;
(2) covering the wear-resistant and corrosion-resistant surface layer 2 on the outer surface of the sink roll composite shaft sleeve body 1 obtained in the step (1) by adopting a laser cladding additive manufacturing method, cladding the wear-resistant and corrosion-resistant surface layer 2 with the unilateral thickness of 3.2-3.3mm by using laser, fixing laser beam spots into square spots with the thickness of 5mm × 5mm, scanning at the speed of 8 mm/s and the powder feeding rate of 25 g/min, and carrying out laser cladding and then carrying out finish machining to the specified size and precision to obtain the laser additive manufactured sink roll composite shaft sleeve.
The body 1 of the sink roll composite shaft sleeve of the embodiment has good high-temperature toughnessProperty, tensile strength 875MPa at 500 ℃ and impact toughness αKU69J/cm2(ii) a The wear-resistant and corrosion-resistant surface layer 2 of the composite shaft sleeve has high hardness of 1273 HV.
Example 2
The composite shaft sleeve for the sink roller manufactured by the laser additive manufacturing method comprises a sink roller shaft sleeve body 1 and an anti-wear and anti-corrosion surface layer 2, wherein the anti-wear and anti-corrosion surface layer 2 covers the sink roller shaft sleeve body 1.
The chemical composition and mass fraction of the material of the sink roll sleeve body 1 comprise 0.43% of C, 22.15% of Cr, 8.51% of Ni, 0.03% of Ce, 0.05% of N, 5.40% of Mo, 2.88% of Al, 12.18% of Nb, 3.46% of Si, 0.27% of Mn, 0.021% of P, 0.015% of S, and the balance of Fe and other unavoidable impurities. The chemical composition and the mass fraction of the wear-resistant and corrosion-resistant surface layer 2 material comprise 18.77% of B, 28.17% of Cr, 16.51% of Co, 9.75% of W, 0.89% of Y, 2.17% of C and 23.74% of Ni.
The preparation method of the composite shaft sleeve of the sink roller by laser additive manufacturing comprises the following steps:
(1) smelting the sink roll shaft sleeve body into molten metal in a 1000 kg medium-frequency induction electric furnace, when the temperature of the molten metal reaches 1578 ℃, pouring the molten metal into a sink roll composite shaft sleeve body blank by adopting a lost foam casting method, continuously heating the blank to 650 ℃, carrying out heat preservation treatment for 3 hours, cooling the blank in the furnace to the temperature of less than 150 ℃, discharging the blank out of the furnace, carrying out air cooling to the room temperature, and carrying out rough machining to obtain a sink roll composite shaft sleeve body 1;
(2) covering the wear-resistant and corrosion-resistant surface layer 2 on the outer surface of the sink roll composite shaft sleeve body 1 obtained in the step (1) by adopting a laser cladding additive manufacturing method, cladding the wear-resistant and corrosion-resistant surface layer 2 with the unilateral thickness of 3.5-3.6mm by using laser, fixing laser beam spots into square spots with the thickness of 5mm × 5mm, scanning at the speed of 12 mm/s and the powder feeding rate of 30 g/min, and carrying out laser cladding and then carrying out finish machining to the specified size and precision to obtain the laser additive manufactured sink roll composite shaft sleeve.
The body 1 of the sink roll composite shaft sleeve of the embodiment has good high-temperature toughness, tensile strength of 890MPa at 500 ℃ and impact toughnessSex αKU67J/cm2(ii) a The wear-resistant and corrosion-resistant surface layer 2 of the composite shaft sleeve has high hardness of 1288 HV.
Example 3
The composite shaft sleeve for the sink roller manufactured by the laser additive manufacturing method comprises a sink roller shaft sleeve body 1 and an anti-wear and anti-corrosion surface layer 2, wherein the anti-wear and anti-corrosion surface layer 2 covers the sink roller shaft sleeve body 1.
The chemical composition and mass fraction of the material of the sink roll sleeve body 1 comprise 0.38% of C, 22.60% of Cr, 8.35% of Ni, 0.05% of Ce, 0.03% of N, 5.61% of Mo, 2.76% of Al, 12.30% of Nb, 3.29% of Si, 0.34% of Mn, 0.020% of P, 0.017% of S, and the balance of Fe and other inevitable impurities. The chemical composition and the mass fraction of the wear-resistant and corrosion-resistant surface layer 2 material comprise 18.08 percent of B, 28.34 percent of Cr, 16.92 percent of Co, 10.12 percent of W, 0.80 percent of Y, 2.23 percent of C and 23.51 percent of Ni.
The preparation method of the composite shaft sleeve of the sink roller by laser additive manufacturing comprises the following steps:
(1) smelting the sink roll shaft sleeve body into molten metal in a 500 kg medium-frequency induction electric furnace, when the temperature of the molten metal reaches 1571 ℃, pouring the molten metal into a sink roll composite shaft sleeve body blank by adopting a lost foam casting method, continuously heating the blank to 625 ℃, carrying out heat preservation treatment for 3.5 hours, cooling the blank in the furnace to the temperature lower than 150 ℃, taking the blank out of the furnace, carrying out air cooling to the room temperature, and carrying out rough machining to obtain a sink roll composite shaft sleeve body 1;
(2) covering the wear-resistant and corrosion-resistant surface layer 2 on the outer surface of the sink roll composite shaft sleeve body 1 obtained in the step (1) by adopting a laser cladding additive manufacturing method, cladding the wear-resistant and corrosion-resistant surface layer 2 with the unilateral thickness of 3.4-3.5mm by using laser, fixing laser beam spots into square spots with the thickness of 5mm × 5mm, scanning at the speed of 10 mm/s and the powder feeding rate of 28 g/min, and carrying out laser cladding and then carrying out finish machining to the specified size and precision to obtain the laser additive manufactured sink roll composite shaft sleeve.
The body 1 of the sink roll composite shaft sleeve of the embodiment has good high-temperature toughness, tensile strength of 880MPa at 500 ℃ and impact toughness of αKU74 J/cm2(ii) a CompoundingThe wear-resistant and corrosion-resistant surface layer 2 of the shaft sleeve has high hardness of 1291 HV.
The body of the sink roll composite shaft sleeve has good high-temperature toughness, the tensile strength at 500 ℃ is more than 850MPa, and the impact toughness is αKUGreater than 65J/cm2And the shaft sleeve is ensured not to deform and crack in use. The composite shaft sleeve of the sink roll has high surface hardness which is more than 1250HV, excellent wear resistance and good zinc liquid corrosion resistance, and has the service life of more than 45 days in a 480 ℃ zinc liquid corrosion environment, which is greatly prolonged compared with the service life of a 316L stainless steel sink roll shaft sleeve. The invention adopts innovative component proportion to manufacture the sinking roller shaft sleeve, has compact microstructure compared with the prior shaft sleeve, excellent mechanical property and durability, and can effectively ensure the long-time stable operation of the sinking roller. The manufacturing method has strong adaptability, simple and convenient operation, strong standardization, lower production cost and great practical value, and the shaft sleeve is popularized and applied, can improve the operating rate of a hot galvanizing unit, reduce the labor intensity of workers, improve the surface quality of a hot galvanizing steel plate and has good economic and social benefits.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The composite shaft sleeve for the sink roller manufactured by the laser additive is characterized by comprising a sink roller shaft sleeve body and an anti-wear and anti-corrosion surface layer, wherein the anti-wear and anti-corrosion surface layer covers the sink roller shaft sleeve body.
2. The composite bushing of claim 1, wherein the chemical composition and mass fraction of the material of the bushing body comprises 0.30-0.43% of C, 22.15-22.83% of Cr, 8.06-8.51% of Ni, 0.03-0.06% of Ce, 0.02-0.05% of N, 5.40-5.79% of Mo, 2.64-2.88% of Al, 12.18-12.53% of Nb, 3.21-3.46% of Si, 0.27-0.41% of Mn, < 0.025% of P, < 0.020% of S, and the balance of Fe and other unavoidable impurities.
3. The composite bushing of claim 1 or 2, wherein the wear and corrosion resistant surface layer material comprises, by mass, 18.03-18.77% of B, 28.17-28.60% of Cr, 16.45-16.92% of Co, 9.75-10.66% of W, 0.75-0.89% of Y, 2.17-2.30% of C, and 23.21-23.74% of Ni.
4. A method for manufacturing a composite shaft sleeve of a sink roll according to any one of claims 1 to 3, comprising the following steps:
(1) smelting the sink roll shaft sleeve body into molten metal, casting into a sink roll composite shaft sleeve body blank, continuously heating, carrying out heat preservation treatment, cooling the furnace to the temperature lower than 150 ℃, taking the sink roll shaft sleeve body out of the furnace, air-cooling to room temperature, and roughly processing to obtain the sink roll composite shaft sleeve body;
(2) covering the wear-resistant and corrosion-resistant surface layer on the outer surface of the sink roll composite shaft sleeve body obtained in the step (1) by adopting a laser cladding additive manufacturing method, and performing laser cladding and finish machining to specified size and precision to obtain the laser additive manufactured sink roll composite shaft sleeve.
5. The method as claimed in claim 4, wherein the temperature of the molten metal when the blank of the composite shaft sleeve body of the sink roll is poured is 1564-1578 ℃.
6. The method for preparing the composite shaft sleeve of the sink roller by the laser additive manufacturing method as claimed in claim 4, wherein in the step (1), the heating is continued to 600-650 ℃, and the temperature is maintained for 3-4 h.
7. The method for preparing the sink roll composite shaft sleeve through laser additive manufacturing according to claim 6, wherein in the step (1), the heating is continued to 625 ℃, and the heat preservation is carried out for 3.5 hours.
8. The method for preparing the sink roll composite shaft sleeve through laser additive manufacturing according to claim 6, wherein the method for casting the sink roll composite shaft sleeve body blank in the step (1) is lost foam casting or investment casting.
9. The preparation method of the composite shaft sleeve of the sink roll by the laser additive manufacturing according to claim 4, wherein the step (2) comprises laser cladding of the anti-wear and anti-corrosion surface layer with the unilateral thickness of 3.2-3.6 mm.
10. The method for preparing the sinking roller composite shaft sleeve through laser additive manufacturing according to claim 4, wherein the parameters of the laser cladding additive manufacturing method in the step (2) are 3800-.
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