CN113621896B - Wear-resistant and corrosion-resistant coating material for impeller of slurry pump in alumina plant and preparation method thereof - Google Patents
Wear-resistant and corrosion-resistant coating material for impeller of slurry pump in alumina plant and preparation method thereof Download PDFInfo
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- CN113621896B CN113621896B CN202110948856.1A CN202110948856A CN113621896B CN 113621896 B CN113621896 B CN 113621896B CN 202110948856 A CN202110948856 A CN 202110948856A CN 113621896 B CN113621896 B CN 113621896B
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- 239000002002 slurry Substances 0.000 title claims abstract description 28
- 239000011248 coating agent Substances 0.000 title claims abstract description 19
- 238000000576 coating method Methods 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 title claims abstract description 18
- 238000005260 corrosion Methods 0.000 title claims description 11
- 230000007797 corrosion Effects 0.000 title claims description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title abstract description 7
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000005253 cladding Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000004372 laser cladding Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 230000007547 defect Effects 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 19
- 239000002346 layers by function Substances 0.000 claims description 13
- 239000011159 matrix material Substances 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000009659 non-destructive testing Methods 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 4
- 238000001291 vacuum drying Methods 0.000 claims description 4
- 230000002929 anti-fatigue Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims 2
- 238000009734 composite fabrication Methods 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract description 11
- 238000004381 surface treatment Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000011651 chromium Substances 0.000 description 7
- 239000002585 base Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 229910001068 laves phase Inorganic materials 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/007—Heat treatment of ferrous alloys containing Co
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- 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
- C23C24/106—Coating with metal alloys or metal elements only
Abstract
An abrasion-resistant coating material for an impeller of a slurry pump in an alumina plant and a preparation method thereof. The invention belongs to the technical field of surface treatment, relates to a laser cladding process for preparing an abrasion-resistant coating, and particularly relates to a coating material for an impeller of a slurry pump in an alumina plant under an abrasion-resistant working condition and a process method thereof. The coating material for laser composite manufacturing of the impeller of the aluminum slurry pump comprises the following components in percentage by mass: 1.5-2% of C, 20-22% of Mo, 2-3% of Si, 14-16% of Cr, 30-32% of Co, 0.2-0.8% of Ti, and the balance of Fe and inevitable impurities. The cladding device adopts a good atmosphere protection device, the cladding layer has no air holes, defects and inclusions, the purity of the cladding layer is high, and the cladding layer has higher impact resistance after heat treatment.
Description
Technical Field
The invention belongs to the technical field of surface treatment, relates to a laser cladding process for preparing an abrasion-resistant coating, and particularly relates to an abrasion-resistant coating material for an impeller of a slurry pump in an alumina plant and a process method thereof.
Background
The aluminum pulp pump is the main equipment for conveying aluminum pulp in an alumina plant, and flow passage parts such as a pump shell, an impeller and the like are consumable parts. The aluminum ore pulp pump has harsh working condition and mainly high temperature and strong alkaliIt is characterized in that the temperature is usually 80-100 ℃, the PH value is more than 14, and the catalyst is a medium with extremely strong corrosiveness. The aluminum ore is mainly diaspore with the component (w%) of AL 2 O 3 60-65、Fe 2 O 3 14-17、SiO 2 3.2-4.5、TiO 2 3.5-4.5, all the overflowing media are hard particles, and the abrasion is serious. Most of the aluminum slurry pump impellers are made of high-chromium cast iron at present. Based on the analysis of the structure and the performance, the failure mode is that under the combined action of strong alkali and low-angle erosive wear, the carbide is separated from the matrix due to the severe corrosion of the carbide phase boundary, good support is lost, the erosive wear of ore pulp promotes the initiation and the expansion of cracks, the stripping of the matrix is accelerated, and the matrix is failed, so that the service efficiency of the pump is influenced.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a powder material for abrasion resistance of an impeller of an alumina slurry pump and a laser composite impeller manufacturing process method, based on failure analysis, the coating material provided by the invention can resist strong base corrosion, has good abrasion resistance and better abrasion resistance, and has the hardness of about 60 HRC. Through the process, the surface of the impeller is subjected to laser cladding, corrosion resistance and abrasion resistance, has certain impact toughness, and the service life of the impeller is prolonged, so that the service life of the whole pump is prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme.
The coating material for laser composite manufacturing of the impeller of the aluminum ore slurry pump comprises the following components in percentage by mass: 1.5-2% of C, 20-22% of Mo, 2-3% of Si, 14-16% of Cr, 30-32% of Co, 0.2-0.8% of Ti, and the balance of Fe and inevitable impurities, wherein the sum of the mass percentages of the components is one hundred percent.
Wherein the granularity of each component is-125 to +300 meshes.
A powder preparation method for repairing an aluminum slurry pump impeller comprises the following steps: and (3) proportioning the powder with the granularity of-125 to +300 meshes according to the mass ratio, placing the powder into a mixer for mixing, and performing vacuum drying treatment when in use.
A process method for laser composite manufacturing of an impeller of an aluminum slurry pump comprises the following process steps: and (3) re-optimizing the substrate according to the use working condition, cladding a functional layer on the surface of the substrate, cladding a 0.8-1.2mm corrosion-resistant and wear-resistant functional layer by using a method of synchronous powder feeding atmosphere protection, carrying out heat treatment on the impeller subjected to laser cladding, and finally carrying out finish machining to the specified size and precision.
A process method for laser composite manufacturing of an impeller of an aluminum slurry pump comprises the following specific steps:
(1) the new matrix is added.
And (3) adding an impeller cladding size chart to the preferable 2Cr13 matrix machine, and performing surface nondestructive testing without defects.
(2) And (4) laser cladding.
Performing laser cladding on 1.5-2% of C, 20-22% of Mo, 2-3% of Si, 14-16% of Cr, 30-32% of Co, 0.2-0.8% of Ti and the balance of Fe and inevitable impurities; preheating an impeller at 180-200 ℃, and carrying out laser cladding on an anti-fatigue wear-resistant functional layer with the thickness of 0.8-1.2mm by using a fiber laser and matching with a laser synchronous powder feeding device; the adopted fiber laser has the parameters as follows: the focal length f of the focusing mirror is 300 mm; the cladding power P is 2500-3000W; the diameter D of the light spot is 3 mm; the cladding scanning speed V is 1000-2000 mm/min; the lapping rate is 50%.
(3) And (6) heat treatment.
Carrying out heat treatment on the aluminum slurry pump impeller repaired by laser cladding in the step (2) by adopting a vacuum heat treatment furnace, wherein the heat treatment process comprises the following steps: tempering at 550 ℃, preserving heat for 120 minutes and air cooling.
(4) And finishing to specified size and precision.
The hardness of the laser cladding functional layer is HRC 58-HRC 60.
Compared with the prior production and manufacturing process and method, the laser cladding technology is used for manufacturing the impeller of the aluminum ore slurry pump, the base body is optimized again, the base body has enough obdurability, the laser manufacturing functional layer has better strong base corrosion resistance and abrasion resistance, the risk of manufacturing the impeller is small, and the service life of the composite manufactured impeller is long.
Compared with the prior art, the invention has the following beneficial effects.
In the coating material for laser composite manufacturing of the impeller of the aluminum ore slurry pump, the content of C is controlled to be 1.5-2%, so that the impact resistance of a cladding layer is ensured, the strength is sufficient, a certain amount of strong carbide can be formed, and the wear resistance is improved. Mo in the coating material mainly has the functions of improving hardenability, improving mechanical properties, particularly improving toughness and improving the wear resistance of steel. The addition of a proper amount of Ti in the coating material not only can purify the crystal boundary, but also can precipitate and harden to separate out fine carbides in the heat treatment process, and has secondary hardening effect.
The Co, Mo and Si elements with specific contents in the coating material for laser composite manufacturing of the impeller of the aluminum ore slurry pump can be precipitated into an intermetallic compound Co with a topological close-packed structure in the heat treatment process 3 Mo 2 Si is a Laves phase, has good strength, high hardness and good corrosion resistance, but the Laves phase is easy to crack due to too high content.
The wear-resistant phase of the invention is the carbide and the Laves phase, and the two phases are reinforced together, thereby ensuring the wear resistance and having excellent strong base corrosion resistance.
Based on specific material design, the invention can form primary carbide and a biocarbide strengthening phase after cladding, the hardness after cladding is about 52HRC, the coating has no cracks, the hardness after heat treatment can reach about 58HRC, and the Co generated after secondary hardening 3 Mo 2 Si, namely the Laves phase strengthens the matrix, and obtains good wear resistance under the combined action of the Si, namely the Laves phase and the carbide, and the salt spray test grade can also reach 72 hours and 9 grades.
The cladding device adopts a good atmosphere protection device, the cladding layer has no air holes, defects and inclusions, the purity of the cladding layer is high, and the cladding layer has higher impact resistance after heat treatment.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The coating material for laser composite manufacturing of the impeller of the aluminum ore slurry pump comprises the following components in percentage by mass: 1.5-2% of C, 20-22% of Mo, 2-3% of Si, 14-16% of Cr, 30-32% of Co, 0.2-0.8% of Ti, and the balance of Fe and inevitable impurities, wherein the sum of the mass percentages of the components is one hundred percent.
Wherein the granularity of each component is-125 to +300 meshes.
A powder preparation method for repairing an aluminum slurry pump impeller comprises the following steps: and (3) proportioning the powder with the granularity of-125 to +300 meshes according to the mass ratio, placing the powder into a mixer for mixing, and performing vacuum drying treatment when in use.
A process method for laser composite manufacturing of an impeller of an aluminum slurry pump comprises the following process steps: and (3) re-optimizing the substrate according to the use working condition, cladding a functional layer on the surface of the substrate, cladding a 0.8-1.2mm corrosion-resistant and wear-resistant functional layer by using a method of synchronous powder feeding atmosphere protection, carrying out heat treatment on the impeller subjected to laser cladding, and finally carrying out finish machining to the specified size and precision.
A process method for laser composite manufacturing of an impeller of an aluminum slurry pump comprises the following specific steps:
(1) the new matrix is added.
And (3) adding an impeller cladding size chart to the preferable 2Cr13 matrix machine, and performing surface nondestructive testing without defects.
(2) And (4) laser cladding.
Performing laser cladding on 1.5-2% of C, 20-22% of Mo, 2-3% of Si, 14-16% of Cr, 30-32% of Co, 0.2-0.8% of Ti and the balance of Fe and inevitable impurities; preheating an impeller at 180-200 ℃, and carrying out laser cladding on an anti-fatigue wear-resistant functional layer with the thickness of 0.8-1.2mm by using a fiber laser and matching with a laser synchronous powder feeding device; the fiber laser is adopted, and the parameters are as follows: the focal length f of the focusing mirror is 300 mm; the cladding power P is 2500-3000W; the diameter D of the light spot is 3 mm; the cladding scanning speed V is 1000-2000 mm/min; the lapping rate is 50%.
(3) And (6) heat treatment.
Carrying out heat treatment on the aluminum slurry pump impeller repaired by laser cladding in the step (2) by adopting a vacuum heat treatment furnace, wherein the heat treatment process comprises the following steps: tempering at 550 ℃, preserving heat for 120 minutes and air cooling.
(4) And finishing to specified size and precision.
The hardness of the laser cladding functional layer is HRC 58-HRC 60.
The aluminum slurry pump impeller base in the embodiment of the invention is 2Cr 13.
Example 1.
The adopted powder comprises 1.6 percent of C, 21 percent of Mo, 2.2 percent of Si, 15 percent of Cr, 31.5 percent of Co, 0.5 percent of Ti and the balance of Fe and inevitable impurities by weight percentage, and the granularity of each component is-125 to +300 meshes.
Preparing the powder with the granularity of-125 to +300 meshes according to the proportion of the components, placing the powder into a mixer for mixing, and carrying out vacuum drying treatment when in use.
The cladding method is carried out according to the following steps.
(1) The new matrix is added.
And (3) adding an impeller cladding size chart to the preferable 2Cr13 matrix machine, and performing surface nondestructive testing without defects.
(2) And (4) laser cladding.
The impeller preheats 180 ℃, utilizes fiber laser, cooperates the synchronous powder feeding device of laser, adopts fiber laser, and its parameter is: the focal length f of the focusing mirror is 300 mm; the cladding power P is 2600W; the diameter D of the light spot is 3 mm; the cladding scanning speed V is 1000 mm/min; the lapping rate is 50%.
(3) And (6) heat treatment.
Carrying out heat treatment on the aluminum slurry pump impeller repaired by laser cladding in the step (2) by adopting a vacuum heat treatment furnace, wherein the heat treatment process comprises the following steps: tempering at 550 ℃, preserving heat for 120 minutes and air cooling.
(4) And finishing to specified size and precision.
The thickness of the cladding layer is 1.0mm, and the surface hardness is HRC 58.
Carrying out nondestructive flaw detection on the clad impeller surface, wherein the processed part has no defects such as cracks, air holes and the like; the sample piece is placed in a laboratory simulation test field, no cavitation pit appears, and the service life is prolonged by 3 times.
Example 2.
The adopted powder comprises 1.55 percent of C, 20 percent of Mo, 2 percent of Si, 16 percent of Cr, 30 percent of Co, 0.7 percent of Ti, the balance of Fe and inevitable impurities, and the balance of Fe and inevitable impurities by weight percentage, and the granularity of each component is-125 to +300 meshes.
The powder preparation was as in example 1.
The cladding method is different from the embodiment 1 in the following points:
the cladding technological parameters are as follows: focusing mirror f is 300mm, laser power P is 2900W, focusing spot diameter: d is 3mm, the scanning speed V is 1200mm/min, the lapping rate T is 50%, the thickness of a cladding layer formed after cladding is 1.2mm, and the surface hardness is HRC 57.5.
Carrying out nondestructive flaw detection on the clad impeller surface, wherein the processed part has no defects such as cracks, air holes and the like; the sample piece is placed in a laboratory simulation test field, no steam corrosion pit occurs, and the service life is prolonged by 3 times.
Claims (3)
1. The coating material for laser composite manufacturing of the impeller of the aluminum ore slurry pump is characterized by comprising the following components in percentage by mass: 1.6-2% of C, 21-22% of Mo, 2-3% of Si, 14-16% of Cr, 30-32% of Co, 0.5-0.8% of Ti, and the balance of Fe and inevitable impurities, wherein the sum of the mass percentages of the components is one hundred percent;
a process method for laser composite manufacturing of an impeller of an aluminum slurry pump comprises the following process steps: cladding a functional layer on the surface of a matrix, cladding a 0.8-1.2mm corrosion-resistant and wear-resistant functional layer by laser by using a synchronous powder feeding atmosphere protection method, carrying out heat treatment on the impeller subjected to laser cladding, and finally carrying out finish machining to a specified size and precision; the method comprises the following specific steps:
(1) adding a new matrix machine: performing surface nondestructive testing on a cladding size chart of a 2Cr13 matrix machine addition impeller without defects;
(2) laser cladding: the components comprise, by mass, 1.6-2% of C, 21-22% of Mo, 2-3% of Si, 14-16% of Cr, 30-32% of Co, 0.5-0.8% of Ti, and the balance of Fe and inevitable impurities, and are subjected to laser cladding; preheating an impeller at 180-200 ℃, and carrying out laser cladding on an anti-fatigue wear-resistant functional layer with the thickness of 0.8-1.2mm by using a fiber laser and matching with a laser synchronous powder feeding device; the adopted fiber laser has the parameters as follows: the focal length f of the focusing mirror is 300 mm; the cladding power P is 2500-3000W; the diameter D of the light spot is 3 mm; the cladding scanning speed V is 1000-2000 mm/min; the lapping rate is 50%;
(3) and (3) heat treatment: carrying out heat treatment on the aluminum slurry pump impeller repaired by laser cladding in the step (2) by adopting a vacuum heat treatment furnace, wherein the heat treatment process comprises the following steps: tempering at 550 ℃, preserving heat for 120 minutes and air cooling;
(4) fine machining to specified size and precision: the hardness of the laser cladding functional layer is HRC 58-HRC 60.
2. The coating material for laser composite fabrication of an aluminum slurry pump impeller as set forth in claim 1, wherein the raw material particle size of each component is-125 to +300 mesh.
3. The coating material for the laser composite manufacturing of the impeller of the aluminum slurry pump as claimed in claim 1, wherein the raw materials of the components are proportioned according to the mass ratio, placed in a mixer for mixing, and subjected to vacuum drying treatment when in use.
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Application publication date: 20211109 Assignee: Shenyang Continental Laser Group Co.,Ltd. Assignor: Shenyang continental laser advanced manufacturing technology innovation Co.,Ltd. Contract record no.: X2023210000142 Denomination of invention: A material and preparation method for anti erosion coating of slurry pump impeller in alumina plants Granted publication date: 20220805 License type: Common License Record date: 20230927 |
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Application publication date: 20211109 Assignee: SHENYANG DALU LASER ENGINEERING CO.,LTD. Assignor: Shenyang continental laser advanced manufacturing technology innovation Co.,Ltd. Contract record no.: X2023210000158 Denomination of invention: A material and preparation method for anti erosion coating of slurry pump impeller in alumina plants Granted publication date: 20220805 License type: Common License Record date: 20231010 |