CN115595471B - Laser processing method for prolonging service life of conveying roller of continuous annealing furnace by using alloy powder - Google Patents
Laser processing method for prolonging service life of conveying roller of continuous annealing furnace by using alloy powder Download PDFInfo
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- CN115595471B CN115595471B CN202211349259.8A CN202211349259A CN115595471B CN 115595471 B CN115595471 B CN 115595471B CN 202211349259 A CN202211349259 A CN 202211349259A CN 115595471 B CN115595471 B CN 115595471B
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- 238000000137 annealing Methods 0.000 title claims abstract description 100
- 239000000843 powder Substances 0.000 title claims abstract description 48
- 239000000956 alloy Substances 0.000 title claims abstract description 44
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 44
- 238000003672 processing method Methods 0.000 title claims abstract description 17
- 238000004372 laser cladding Methods 0.000 claims abstract description 35
- 238000005253 cladding Methods 0.000 claims description 78
- 238000000034 method Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000005498 polishing Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 238000005336 cracking Methods 0.000 abstract description 6
- 239000002244 precipitate Substances 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 229910000765 intermetallic Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000010285 flame spraying Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000024121 nodulation Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910020010 Nb—Si Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a laser processing method for prolonging the service life of a conveying roller of a continuous annealing furnace by using alloy powder, wherein the alloy powder used for laser cladding comprises the following components: 0.24-0.26wt%; cr:24.5-25.5wt%; co:29.8 to 30.2wt%; mn:0.2 to 0.30wt%; mo:2.9 to 3.1wt%; nb:0.21 to 0.23wt%; si:0.7-1.1wt%; o: less than or equal to 0.015wt%; s is less than or equal to 0.030wt%; p is less than or equal to 0.030wt%; the invention also discloses a laser processing method for prolonging the service life of the conveying roller of the continuous annealing furnace by using the alloy powder, which improves the high-temperature red hardness and the cracking resistance of the laser coating and prolongs the service life of the conveying roller of the continuous annealing furnace while reducing the cost.
Description
Technical Field
The invention relates to the field of laser cladding processing, in particular to a laser processing method for prolonging the service life of a conveying roller of a continuous annealing furnace by using alloy powder.
Background
The continuous annealing furnace conveying roller of the steel mill silicon steel production line is usually manufactured by a nickel-chromium alloy pipe of Cr28Ni48W5, and the pipe is usually repaired or scrapped in a lower line due to the problems of abrasion, deformation, nodulation and the like under the working condition environment of 900-1100 ℃. The thickness of the roll surface of the conveying roll is only 10-14mm, and a common repairing mode is supersonic spraying or flame spraying, but the repairing mode has the problems of poor compactness of a coating and weak binding force between the coating and a substrate, so that the problem of coating nodulation after spraying can be further aggravated and the phenomenon of coating chipping can be caused. The work piece after the ultrasonic spraying or flame spraying repair is on line only for about 15-30 days and needs to be repaired once off line, and after the work piece is repaired for 8 times on average, the conveying roller enters a scrapping process. Therefore, the additive manufacturing method with low heat output, compact coating and strong binding force between the coating and the substrate is urgently needed in the iron and steel industry to replace the existing spraying technology, the laser cladding technology can solve the problems in the industry, and the laser cladding technology utilizes the characteristic of high energy density per unit area, has small heat output compared with the traditional overlaying welding, has compact coating and is metallurgically bound with the substrate compared with spraying.
The Chinese patent publication No. CN110747465A discloses a laser manufacturing method of a hearth roller of a hot-rolling annealing furnace, wherein two alloy powders used in the method are cobalt-based alloy powders with high carbon (0.8-2.0 wt%) and high tungsten (7-15 wt%) and the hardness of a cladding layer is 35-45HRC, and the powder mainly has the following three defects: the first is that the powder of the combination of high carbon and high tungsten has poor cracking resistance during laser cladding. The roller is made of a pipe, the wall thickness is only 10-14mm, the temperature rise of the roller surface is quick (average 450 ℃/min) during laser cladding, and the temperature drop is quick after cladding is finished, so that the cladding layer is torn by huge deformation shrinkage force, and the invention does not mention the use of some measures for reducing the cracking risk; secondly, the thermal expansion coefficients of the cobalt-based alloy cladding layer and the nichrome base material are different, and in a high-temperature environment of 900-1100 ℃, the deformation of the conveying roller can be accelerated, so that the phenomenon of so-called 'kowtow' in the industry is caused when the silicon steel sheet is continuously annealed, and the continuous operation of a production line is influenced; the third is that the price of cobalt-base alloy is high, the price per kilogram is about 500 yuan, on the other hand, taking the continuous annealing furnace conveying roller with the diameter of 150mm and the length of 3.26m as an example, the price of one roller is about 4 ten thousand RMB, the average use area of each roller is 1.22 square meters, and under the condition that the average cladding thickness is 3mm, the powder cost of a single roller is more than 1.34 ten thousand yuan, and the powder cost of the single roller is more than three times the new roller cost, so that the repairing cost of an old roller is high.
In view of the foregoing, there is a need for an alloy powder that allows the laser cladding layer to be tightly bonded to the continuous annealing furnace conveyor rolls and to be adapted to the operating conditions of the continuous annealing furnace, and that has excellent high-temperature red hardness and cracking resistance.
Disclosure of Invention
In order to solve the above problems, the present invention provides a novel alloy powder for laser processing for improving the service life of a continuous annealing furnace conveying roller, which is characterized in that: the alloy powder comprises the following components: 0.24-0.26wt%; cr:24.5-25.5wt%; co:29.8 to 30.2wt%; mn:0.2 to 0.30wt%; mo:2.9 to 3.1wt%; nb:0.21 to 0.23wt%; si:0.7-1.1wt%; o: less than or equal to 0.015wt%; s is less than or equal to 0.030wt%; p is less than or equal to 0.030wt%; ni is the balance.
Further, the use of the alloy powder in the field of laser cladding processing is used for inhibiting the generation of thermal cracks and fatigue cracks of a cladding layer of a conveying roller of a continuous annealing furnace during laser cladding processing.
Further, the alloy powder is used in the field of laser cladding processing, and the alloy powder is used for improving the high-temperature red hardness of a cladding layer of a conveying roller of a continuous annealing furnace during the laser cladding processing.
Further, a laser processing method for improving the service life of a conveying roller of a continuous annealing furnace by using the alloy powder is characterized in that: the method comprises the following steps:
s1, performing laser cladding on the surface of a conveying roller of a continuous annealing furnace by using a direct output semiconductor laser;
s2, heating the cladding layer which is already clad by using a heating belt during laser cladding, and keeping the temperature of a continuous annealing furnace conveying roller constant;
s3, immediately placing the continuous annealing furnace conveying roller in a resistance furnace for heat preservation for 12 hours after the laser cladding is finished, then cooling to 230-250 ℃ along with the furnace, taking out the continuous annealing furnace conveying roller, and immediately placing the continuous annealing furnace conveying roller on a straightening machine for correction;
s4, cooling the continuous annealing furnace conveying roller to room temperature, placing the continuous annealing furnace conveying roller on a lathe, and polishing the cooled continuous annealing furnace conveying roller.
Further, step S1 directly outputs the semiconductor laser with the spot size of 2x6mm, the power of 5800-6000w, the single-side cladding thickness of 1.4-1.6mm, the linear speed of 30-32mm/S and the lap joint rate of 53-55% of the spot length, and the single-side cladding is performed for two times.
Further, the temperature of the conveying roller of the continuous annealing furnace in the step S2 is 650-700 ℃.
Further, the temperature in the resistance furnace in the step S3 is 640-660 ℃.
Further, the integral deformation of the conveying roller of the continuous annealing furnace after correction in the step S3 is not more than 0.3mm.
Further, the polishing operation in step S4 includes fixing the continuous annealing furnace conveying roller to the lathe using a bracket, and the processing and polishing operation of the cladding layer using the method of the segment type grinding wheel polishing includes fixing the continuous annealing furnace conveying roller to the lathe using a bracket, and the processing of the cladding layer using the method of the segment type grinding wheel polishing.
Further, the fixed interval of conveying rollers of the continuous annealing furnace in the step S4 is 0.5m, and the thickness of a cladding layer on the surface of a workpiece after polishing is not less than 1.0mm.
The beneficial effects are that:
the characteristic that the energy density is high on the unit area of the laser cladding technology is utilized, the metal coating is tightly combined with the conveying roller surface wall, the cladding heating control temperature after cladding is controlled by using the heating belt, the conveying rolling deformation caused by the conveying temperature change during laser cladding is reduced, on the other hand, the conveying rolling deformation is reduced by correcting the conveying by a straightening machine for the product, and the conveying rolling repair quality is improved.
The alloy powder adopts nickel element which is the same as the main element of the base material as the main alloy element, ensures that the thermal expansion coefficient of the cladding layer is consistent with that of the conveying base material, and utilizes the heat resistance of cobalt element and the capability of promoting precipitation strengthening of medium-strength carbide and intermetallic compound of Ni and Co to prepare proper amount of M-C carbide and G-phase intermetallic compound in the cladding layer.
Drawings
FIG. 1 is a schematic view of a laser cladding continuous annealing furnace conveyor roll;
FIG. 2 is a schematic view of the heat treatment of the continuous annealing furnace conveying roller after laser cladding;
FIG. 3 shows a binary equilibrium phase diagram of the alloy powder provided by the invention during laser cladding.
The reference numerals are explained as follows: 1. a laser-powder system; 2. a continuous annealing furnace conveying roller; 3. and (5) heating the belt.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to one of ordinary skill in the art without undue burden are within the scope of the invention
The selection of the alloying powder elements and the selection of the element content according to the invention are shown in table 1 below.
Table 1 principle of selecting element and element content
The general design concept of the alloy powder provided by the invention is further described:
the concept of the alloy powder design of the invention has two main points: firstly, solve the easy cracked problem of superalloy at the time of the cladding processing of laser, secondly, increase the red hardness of the cladding on this basis. Therefore, nickel which is the same as the main element of the base material is specially selected as the main alloy element, and then proper M-C type carbide and G phase intermetallic compound in the cladding layer are prepared by utilizing the heat resistance of cobalt element and the capability of strengthening precipitation of intermediate strength carbide and intermetallic compound of Ni and Co, and the precipitated phase not only inhibits the generation of hot cracks and fatigue cracks, but also further improves the high-temperature red hardness. Furthermore, both types of precipitates promote a longer life than a single precipitated phase relative to the cladding layer.
Example 1
A laser processing method for improving the service life of a continuous annealing furnace conveying roller by using alloy powder is characterized in that the alloy powder used in the laser processing technology comprises the following components: c:0.24wt%; cr:24.5wt%; co:29.8wt%; mn:0.2wt%; mo:2.9wt%; nb:0.21wt%; si:0.7wt%; o:0.012wt%; 0.025wt% of S; 0.020wt% of P; ni is the balance.
The method for forming the cladding layer by laser processing the alloy powder on the conveying roller of the continuous annealing furnace comprises the following steps:
s1, a direct output semiconductor laser with the size of a light spot of 2x6mm and the power of 5800w is selected to carry out laser cladding on the surface of a continuously conveyed sheet-formed part of an annealing furnace, wherein the thickness of single-side cladding is 1.4mm, the linear speed is 30mm/S, the lap joint rate is 53% of the light spot length, and the cladding is carried out by eutectic twice;
s2, heating the cladding layer which is already clad by using a heating belt in the cladding process, and ensuring the temperature to be 650 ℃;
s3, after laser cladding is finished, immediately placing the continuous conveying roller of the annealing furnace in a resistance furnace at 640 ℃ for heat preservation for 12 hours, then cooling to 230 ℃ along with the furnace, taking out the continuous conveying roller of the annealing furnace, immediately placing the continuous conveying roller of the annealing furnace on a straightening machine for correction, and enabling the overall deformation of the continuous conveying roller of the annealing furnace to be 0.25mm;
s4, after the annealing furnace continuously conveys the rolls to the room temperature, placing the continuously conveyed rolls of the annealing furnace on a lathe, continuously conveying the rolls of the annealing furnace on a bracket at a fixed interval distance of 0.5 meter, processing a cladding layer by adopting a sectional grinding wheel polishing method, continuously conveying the rolls of the annealing furnace to polish the rolls of the visible light, and finally keeping the thickness of the cladding layer on the continuously conveyed rolls of the annealing furnace to be 1.2mm;
the steps S1-S3 are shown in FIG. 1 and FIG. 2.
Example two
A laser processing method for improving the service life of a continuous annealing furnace conveying roller by using alloy powder is characterized in that the alloy powder used in the laser processing technology comprises the following components: c:0.25wt%; cr:25.0wt%; co:30.0wt%; mn:0.25wt%; mo:3.0wt%; nb:0.22wt%; si:0.9wt%; o:0.014wt%; 0.020wt% of S; p0.027 wt%; ni is the balance.
The method for forming the cladding layer by laser processing the alloy powder on the conveying roller of the continuous annealing furnace comprises the following steps:
s1, a direct output semiconductor laser with the size of a light spot of 2x6mm and the power of 5900w is selected to carry out laser cladding on the surface of the continuously conveyed cone-shaped roller in an annealing furnace, wherein single-side cladding thickness is 1.5mm, linear speed is 31mm/S, overlap ratio is 54% of the light spot length, and the cladding is carried out in a eutectic way twice;
s2, heating the cladding layer which is already clad by using a heating belt in the cladding process, and ensuring the temperature to be 675 ℃;
s3, after laser cladding is finished, immediately placing the continuous conveying roller of the annealing furnace in a resistance furnace at 650 ℃ for heat preservation for 12 hours, then cooling to 240 ℃ along with the furnace, taking out the continuous conveying roller of the annealing furnace, immediately placing the continuous conveying roller of the annealing furnace on a straightening machine for correction, and enabling the overall deformation of the continuous conveying roller of the annealing furnace to be 0.27mm;
s4, after the annealing furnace continuously conveys the rolls to the room temperature after the rolls are cooled down, placing the annealing furnace continuously conveys the rolls on a lathe, fixing the annealing furnace continuously conveys the rolls on a bracket at a fixed distance of 0.5m, processing the cladding layer by adopting a sectional grinding wheel polishing method, and finally keeping the thickness of the cladding layer on the annealing furnace continuously conveys the rolls to be not less than 1.4mm after the annealing furnace continuously conveys the rolls to polish the rolls.
The steps S1-S3 are shown in FIG. 1 and FIG. 2.
Example III
A laser processing method for improving the service life of a continuous annealing furnace conveying roller by using alloy powder is characterized in that the alloy powder used in the laser processing technology comprises the following components: c:0.26wt%; cr:25.5wt%; co:30.2wt%; mn:0.3wt%; mo:3.1wt%; nb:0.23wt%; si:1.1wt%; o:0.014wt%; 0.029wt% of S; p0.024 wt%; ni is the balance.
The method for forming the cladding layer by laser processing the alloy powder on the conveying roller of the continuous annealing furnace comprises the following steps: :
s1, a direct output semiconductor laser with the size of a light spot of 2x6mm and the power of 6000w is selected to carry out laser cladding on the surface of a continuously conveyed sheet in an annealing furnace, wherein the single-side cladding thickness is 1.6mm, the linear speed is 32mm/S, the lap joint rate is 55% of the light spot length, and the cladding is carried out in a eutectic way for two times;
s2, heating the cladding layer which is already clad by using a heating belt in the cladding process, and ensuring the temperature to be 700 ℃;
s3, after laser cladding is finished, immediately placing the continuous conveying roller of the annealing furnace in a resistance furnace at 660 ℃ for heat preservation for 12 hours, then cooling to 250 ℃ along with the furnace, taking out the continuous conveying roller of the annealing furnace, immediately placing the continuous conveying roller of the annealing furnace on a straightening machine for correction, and enabling the overall deformation of the continuous conveying roller of the annealing furnace to be 0.2mm;
s4, after the annealing furnace continuously conveys the rolls to the room temperature after the rolls are cooled down, placing the annealing furnace continuously conveys the rolls on a lathe, fixing the annealing furnace continuously conveys the rolls on a bracket at a fixed distance of 0.5m, processing the cladding layer by adopting a sectional grinding wheel polishing method, and finally leaving the thickness of the cladding layer on the annealing furnace continuously conveys the rolls to be 1.6mm after the annealing furnace continuously conveys the rolls to polish the rolls.
The steps S1-S3 are shown in FIG. 1 and FIG. 2.
In the first to third embodiments, the above steps can form a cladding layer with a thickness not less than 1.0mm on the conveying roller surface of the continuous annealing furnace, and the Cr element content in the cladding layer is 24.5-25.5wt%. The method has the advantages that the defects that when the temperature of a cladding layer is 900-1100 ℃, cr element content in the cladding layer is lower than 24.5wt% and the conveyed cladding layer is easy to form a skin and form, when the Cr element content in the cladding layer is higher than 25.5wt%, the cracking tendency of the cladding layer is overlarge, mo element content in the cladding layer is 2.9-3.1wt%, nb element content is 0.21-0.23wt%, when the Mo element and Nb element content in the cladding layer are respectively lower than 2.9wt% and 0.23wt%, the number of nodules on a unit area of a conveying roll surface is increased by 1.43 times, when the Mo element content and Nb element content is higher than 3.1wt% and 2.3wt%, the brittle precipitate phase (G phase) of the cladding layer is increased, the spheroidicity of the precipitate phase is developed to a strip shape, hardness fluctuation is higher than 5HRC, the defects that the C element content in the cladding layer is 0.24-0.26wt%, when the C element content in the cladding layer is lower than 0.24wt%, the content in the cladding layer is lower than 0.26wt%, the easy to form a carbide phase is not more than 8.26 wt%, the grain boundary layer is not easy to form a crack, the crack is not easy to form, the crystal precipitate phase is not easy to form a grain boundary layer is not more than 29.8.30 wt%, the crystal precipitate is not easy to crack, and the Co phase is not easy to form a crack is not more than the crystal precipitate in the crystal precipitate, and the crystal precipitate phase is not more than 2.8.8 wt% is serious, and the crack is not easy to form in the grain boundary layer is not more than the crystal precipitate in the crystal precipitate; when the content of Co in the cladding layer is higher than 30.2wt%, the thermal expansion coefficient of the cladding layer at 900-1100 ℃ is reduced in an index level, the difference between the thermal expansion coefficient of the cladding layer and the thermal expansion coefficient of the substrate is larger, the defect that the cracking tendency of the cladding layer is increased is caused, the Mn content in the cladding layer is 0.2-0.30wt%, the Mn content in the cladding layer is in the content range, the removal of impurity element S can be promoted, the high-temperature oxidization resistance of the cladding layer can be prevented from being influenced by the excessively high Mn content, the Si content in the cladding layer is 0.7-1.1wt%, the Si content in the cladding layer is in the range, the easily-air outlet hole of the cladding layer can be prevented from being lower than 0.7wt%, the G phase (Ni-Nb-Si phase) in the cladding layer is increased when the Si content is higher than 1.1wt%, the defect that the cladding layer is easily cracked is caused, mn and Si elements can promote the removal of impurity elements such as O element S element P element in the cladding layer, the Ni element in the cladding layer can ensure that the cladding layer is matched with the property of the chromium alloy material of Cr28Ni48W5 conveyed by a continuous annealing furnace, the strength is increased, and the bonding cost is reduced
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. An alloy powder for laser processing for improving the life of a continuous annealing furnace conveying roller, characterized in that: the alloy powder comprises the following components: 0.24-0.26wt%; cr:24.5-25.5wt%; co:29.8 to 30.2wt%; mn:0.2 to 0.30wt%; mo:2.9 to 3.1wt%; nb:0.21 to 0.23wt%; si:0.7-1.1wt%; o: less than or equal to 0.015wt%; s is less than or equal to 0.030wt%; p is less than or equal to 0.030wt%; the laser processing method for improving the service life of the conveying roller of the continuous annealing furnace by using the alloy powder comprises the following steps of:
s1, performing laser cladding on the surface of a conveying roller of a continuous annealing furnace by using a direct output semiconductor laser;
s2, heating the cladding layer which is already clad by using a heating belt during laser cladding, and keeping the temperature of a continuous annealing furnace conveying roller constant;
s3, immediately placing the continuous annealing furnace conveying roller in a resistance furnace for heat preservation for 12 hours after the laser cladding is finished, then cooling to 230-250 ℃ along with the furnace, taking out the continuous annealing furnace conveying roller, and immediately placing the continuous annealing furnace conveying roller on a straightening machine for correction;
s4, cooling the continuous annealing furnace conveying roller to room temperature, placing the continuous annealing furnace conveying roller on a lathe, and polishing the cooled continuous annealing furnace conveying roller.
2. Use of the alloy powder according to claim 1 in the field of laser cladding processing, characterized in that the alloy powder is used for suppressing the occurrence of hot cracks and fatigue cracks of a cladding layer of a continuous annealing furnace conveying roller during laser cladding processing.
3. Use of the alloy powder according to claim 1 in the field of laser cladding processing, characterized in that the alloy powder is used for improving the high temperature red hardness of a continuous annealing furnace conveying roller cladding layer during laser cladding processing.
4. A laser processing method for improving the life of a continuous annealing furnace conveying roller by using the alloy powder as defined in claim 1, characterized by: the method comprises the following steps:
s1, performing laser cladding on the surface of a conveying roller of a continuous annealing furnace by using a direct output semiconductor laser;
s2, heating the cladding layer which is already clad by using a heating belt during laser cladding, and keeping the temperature of a continuous annealing furnace conveying roller constant;
s3, immediately placing the continuous annealing furnace conveying roller in a resistance furnace for heat preservation for 12 hours after the laser cladding is finished, then cooling to 230-250 ℃ along with the furnace, taking out the continuous annealing furnace conveying roller, and immediately placing the continuous annealing furnace conveying roller on a straightening machine for correction;
s4, cooling the continuous annealing furnace conveying roller to room temperature, placing the continuous annealing furnace conveying roller on a lathe, and polishing the cooled continuous annealing furnace conveying roller.
5. A laser processing method for improving the life of a continuous annealing furnace conveying roller by using alloy powder according to claim 4, wherein: the step S1 directly outputs the semiconductor laser with the spot size of 2x6mm, the power of 5800-6000w, the single-side cladding thickness of 1.4-1.6mm, the linear speed of 30-32mm/S and the lap joint rate of 53-55% of the spot length, and the single-side cladding is performed for two times.
6. A laser processing method for improving the life of a continuous annealing furnace conveying roller by using alloy powder as defined in claim 4, characterized by: and in the step S2, the temperature of the conveying roller of the continuous annealing furnace is 650-700 ℃.
7. A laser processing method for improving the life of a continuous annealing furnace conveying roller by using alloy powder according to claim 4, wherein: and the temperature in the resistance furnace in the step S3 is 640-660 ℃.
8. A laser processing method for improving the life of a continuous annealing furnace conveying roller by using alloy powder according to claim 4, wherein: and the integral deformation of the conveying roller of the continuous annealing furnace after the correction in the step S3 is not more than 0.3mm.
9. A laser processing method for improving the life of a continuous annealing furnace conveying roller by using alloy powder according to claim 4, wherein: the step S4 polishing operation comprises the steps of fixing a continuous annealing furnace conveying roller on a lathe by using a bracket and processing a cladding layer by using a sectional grinding wheel polishing method.
10. A laser processing method for improving the life of a continuous annealing furnace conveying roller by using alloy powder according to claim 9, wherein: and step S4, the fixed interval of the conveying rollers of the continuous annealing furnace is 0.5m, and the thickness of the cladding layer on the surface of the workpiece after polishing is not less than 1.0mm.
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