CN112795916A - Laser cladding alloy powder and laser cladding method for roller step pad - Google Patents
Laser cladding alloy powder and laser cladding method for roller step pad Download PDFInfo
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- CN112795916A CN112795916A CN202110008852.5A CN202110008852A CN112795916A CN 112795916 A CN112795916 A CN 112795916A CN 202110008852 A CN202110008852 A CN 202110008852A CN 112795916 A CN112795916 A CN 112795916A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 52
- 239000000956 alloy Substances 0.000 title claims abstract description 52
- 239000000843 powder Substances 0.000 title claims abstract description 46
- 238000004372 laser cladding Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000010410 layer Substances 0.000 claims abstract description 51
- 239000002344 surface layer Substances 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 3
- 238000005253 cladding Methods 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 13
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 239000000758 substrate Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- 238000009826 distribution Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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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
- C23C24/106—Coating with metal alloys or metal elements only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/40—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
-
- 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
- C22C38/40—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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Laser Beam Processing (AREA)
Abstract
A laser cladding alloy powder and a laser cladding method of a roller step pad comprise a bottom layer alloy powder and a surface layer alloy powder; the bottom layer alloy powder comprises the following components in percentage by mass: 0.05 to 0.10 percent of C, 0.5 to 1.5 percent of Si, 14 to 18 percent of Cr, 0.6 to 1.0 percent of Mo, 5.0 to 7.5 percent of Ni, 0.20 to 0.30 percent of Nb and the balance of Fe; the surface layer alloy powder comprises the following components in percentage by mass: 0.15 to 0.20 percent of C, 1.0 to 1.5 percent of Si, 14 to 18 percent of Cr, 1.0 to 1.5 percent of Mo, 2.0 to 3.0 percent of Ni, 0.2 to 0.6 percent of Mn and the balance of Fe. Compared with the surface layer alloy powder, the bottom layer alloy powder reduces C, increases Ni element, has better toughness, and simultaneously the alloy layer and the base material form reasonable hardness gradient, thus being capable of obviously prolonging the service life of the roller step pad.
Description
Technical Field
The invention belongs to the technical field of metal surface treatment, and particularly relates to laser cladding alloy powder of a roller step pad and a laser cladding method.
Background
The step pad is a roller system component of the finishing mill and is mainly used for adjusting the height of a rolling line. The stepped pad is made of high-alloy structural steel and martensitic stainless steel, the main material is 34CrNi3Mo, and the surface hardening forms include carburizing, nitriding, surface quenching and the like. The step pad can be under the pressure effect of bearing frame, backing plate and hydraulic means in the use to can take place frictional wear with the position of contacting with it. The dimensional accuracy of the step pad is severely degraded due to wear and corrosion during use, and the step pad needs to be repaired or replaced. The skilled person is therefore constantly striving to find effective ways to extend the life and reuse of the step pad.
The laser cladding technology has the advantages of small dilution rate, small matrix thermal deformation, small cladding layer tissue and the like, and is widely applied to the repair of the surface of a wear-resistant workpiece. For example, patent application CN 109468634 a discloses a process method for recovering precision of a rolling mill step pad by using a laser cladding technology, which performs tracking detection on a product after repair, and can recover dimensional precision of the step pad after laser cladding; however, in the method, due to the difference of hardness between the roller substrate and the clad alloy layer, the bonding property of the roller substrate and the clad alloy layer is poor, and the alloy layer is easy to crack.
Disclosure of Invention
The invention aims to solve the technical problem of providing laser cladding alloy powder of the roller stepped pad with good compatibility and bonding property; the invention also provides a laser cladding method of the roller step pad.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the alloy powder comprises bottom alloy powder and surface alloy powder;
the bottom layer alloy powder comprises the following components in percentage by mass: 0.05 to 0.10 percent of C, 0.5 to 1.5 percent of Si, 14 to 18 percent of Cr, 0.6 to 1.0 percent of Mo, 5.0 to 7.5 percent of Ni, 0.20 to 0.30 percent of Nb and the balance of Fe;
the surface layer alloy powder comprises the following components in percentage by mass: 0.15 to 0.20 percent of C, 1.0 to 1.5 percent of Si, 14 to 18 percent of Cr, 1.0 to 1.5 percent of Mo, 2.0 to 3.0 percent of Ni, 0.2 to 0.6 percent of Mn and the balance of Fe.
The method adopts the alloy powder, and the process comprises the following steps: carrying out laser cladding on the step pad by adopting bottom layer alloy powder to form a cladding bottom layer; and performing laser cladding on the cladding bottom layer by adopting surface layer alloy powder to form a cladding surface layer.
The technological parameters of laser cladding of the method of the invention are as follows: the power is 2000-3000W, the diameter of a light spot is phi 2-3 mm, the scanning speed is 8-10 mm/s, and the lap joint rate is 40-60%; and protecting the molten pool with inert gas in the cladding process.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the bottom alloy powder fully considers the wettability and compatibility with the matrix material, and avoids the occurrence of cracks in the alloying process; compared with the surface layer alloy powder, the bottom layer alloy powder adjusts the formula components, reduces the content of C, increases the Ni element, enables the bottom layer alloy powder to obtain better toughness, forms reasonable hardness gradient with the base material, and can obviously prolong the service life of the roller step pad.
According to the method, through two times of laser cladding and control of the composition of the alloy powder in the two times of cladding processes, the defects such as air holes on the surface of the roller step pad are closed and closed during the bottom layer laser cladding; and two layers of composite alloy layers formed by two times of laser cladding form hardness gradient change on the surface of the step pad, so that the problem of cracking caused by severe hardness change between the roller substrate and the alloy layers can be prevented. The method of the invention fully considers the compatibility and the combination ability of the laser cladding layer and the substrate material, selects two materials of the bottom layer and the surface layer to form a gradient composite material, realizes the reasonable distribution of the hardness gradient from the surface cladding layer to the substrate, has the characteristics of restoring the design size precision of the original roller step pad and increasing the surface corrosion resistance and wear resistance, improves the characteristics of large abrasion loss, surface corrosion and the like of the step pad, improves the integral use efficiency, and can obviously prolong the service life of the roller step pad.
The method has the advantages of small heat input amount during laser cladding, small influence on the surface, no large deformation, smooth and uniform surface of the obtained product, high glossiness and longer service life of the product by more than 3 times.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram showing the hardness gradient distribution of a substrate and a cladding layer of a roll stepped pad obtained in example 1 of the present invention;
FIG. 2 is a schematic diagram showing the hardness gradient distribution of the substrate and the cladding layer of the stepped pad of the roll obtained in comparative example 1;
FIG. 3 is a schematic diagram showing the hardness gradient distribution of the substrate and the cladding layer of the roll stepped pad obtained in comparative example 2.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Examples 1-8 and comparative examples 1-2: the embodiment is a method for obtaining a two-layer composite cladding layer by adopting the laser cladding alloy powder of the roller step pad and the laser cladding method; the comparative example is a conventional production method, and in the conventional method, the step pad adopts a traditional single alloy powder material cladding treatment method to obtain a single-layer cladding layer; the process of each method is specifically described below.
(1) The components and the mass percentages of the bottom layer alloy powders used in examples 1-8 are shown in Table 1; the components and the mass percentage of the surface layer alloy powder adopted in the embodiments 1 to 8 are shown in the table 2; the compositions and the mass percentages of the alloy powders of comparative examples 1-2 are shown in Table 3.
Table 1: composition (wt) of alloy powder for underlayer of each example
In table 1, the balance of the components is Fe.
Table 2: composition (wt) of alloy powder for surface layer of each example
In table 2, the balance of the components is Fe.
Table 3: composition (wt) of comparative example alloy powder
In table 3, the balance of the components is Fe.
(2) Carrying out rust removal treatment on the surface of the step pad in a sand blasting, grinding and polishing mode; removing a surface fatigue layer on the surface of the step pad through milling, wherein the fatigue layer mainly comprises a quenching layer, a carburization layer, a nitriding layer and a surface corrosion layer on the original surface; carrying out laser cladding on the treated step pad by adopting bottom layer alloy powder to form a cladding bottom layer; finally, performing laser cladding on the cladding bottom layer by adopting surface layer alloy powder to form a cladding surface layer; and obtaining the cladding step pad product. The parameters of the two laser cladding processes are as follows: the power is 2000-3000W, the diameter of a light spot is 2-3 mm, the scanning speed is 8-10 mm/s, and the lap joint rate is 40-60%; pneumatic powder feeding is adopted, and a molten pool is protected by argon in the cladding process. The laser cladding process parameters for each example and comparative example are shown in table 4.
Table 4: laser cladding process parameters of the various embodiments
(3) FIG. 1 shows the hardness gradient distribution of the substrate and the cladding layer of the stepped roller pad obtained in example 1, FIG. 2 shows the hardness gradient distribution of the substrate and the cladding layer of the alloy powder material with low carbon content in comparative example 1, and FIG. 3 shows the hardness gradient distribution of the substrate and the cladding layer of the alloy powder material with high carbon content in comparative example 2. From fig. 1, it can be seen that the composite cladding layer of the two materials realizes the transition of the hardness with a relatively slow gradient, and the interface layer is tightly combined to obtain a good cladding result. As can be seen from FIG. 2, the single material with low carbon content is adopted, the difference between the hardness values of the cladding layer and the substrate is small, and the good surface hardness strengthening effect cannot be achieved. As can be seen from FIG. 3, the single material with high carbon content is adopted, the hardness value fall of the cladding layer and the substrate is too large, and the cladding layer is easy to fall off due to early fatigue cracks in the using process, so that the application requirement cannot be met.
The hardness of the cladding bottom layer and the cladding surface layer obtained in each example and the service life of the obtained cladding-finished step pad product are shown in table 5.
Table 5: properties of the products of the examples
Claims (3)
1. The laser cladding alloy powder of the roller step pad is characterized by comprising bottom layer alloy powder and surface layer alloy powder;
the bottom layer alloy powder comprises the following components in percentage by mass: 0.05 to 0.10 percent of C, 0.5 to 1.5 percent of Si, 14 to 18 percent of Cr, 0.6 to 1.0 percent of Mo, 5.0 to 7.5 percent of Ni, 0.20 to 0.30 percent of Nb and the balance of Fe;
the surface layer alloy powder comprises the following components in percentage by mass: 0.15 to 0.20 percent of C, 1.0 to 1.5 percent of Si, 14 to 18 percent of Cr, 1.0 to 1.5 percent of Mo, 2.0 to 3.0 percent of Ni, 0.2 to 0.6 percent of Mn and the balance of Fe.
2. A laser cladding method of a roller step pad adopts the alloy powder of claim 1, and is characterized in that: carrying out laser cladding on the step pad by adopting bottom layer alloy powder to form a cladding bottom layer; and performing laser cladding on the cladding bottom layer by adopting surface layer alloy powder to form a cladding surface layer.
3. The laser cladding alloy powder of the roller step pad and the laser cladding method of the roller step pad as claimed in claim 1, wherein the laser cladding process parameters are as follows: the power is 2000-3000W, the diameter of a light spot is phi 2-3 mm, the scanning speed is 8-10 mm/s, and the lap joint rate is 40-60%; and protecting the molten pool with inert gas in the cladding process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110008852.5A CN112795916A (en) | 2021-01-05 | 2021-01-05 | Laser cladding alloy powder and laser cladding method for roller step pad |
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| CN202110008852.5A CN112795916A (en) | 2021-01-05 | 2021-01-05 | Laser cladding alloy powder and laser cladding method for roller step pad |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113564482A (en) * | 2021-08-04 | 2021-10-29 | 温州东南工业机械实业有限公司 | Improved step pad for rolling mill and surface cladding surfacing process thereof |
| CN115341210A (en) * | 2022-08-16 | 2022-11-15 | 泰尔(安徽)工业科技服务有限公司 | Composite step pad for rolling mill and processing method thereof |
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|---|---|---|---|---|
| WO2012119947A1 (en) * | 2011-03-04 | 2012-09-13 | Nv Bekaert Sa | Method to produce a sawing bead |
| CN111058035A (en) * | 2019-12-31 | 2020-04-24 | 南京中科煜宸激光技术有限公司 | Process for preparing wear-resistant and corrosion-resistant alloy coating on surface of copper and copper alloy by laser cladding and alloy coating |
| CN111139464A (en) * | 2019-12-05 | 2020-05-12 | 新疆大学 | High-speed wire rod roller repairing method based on laser cladding and repairing structure thereof |
-
2021
- 2021-01-05 CN CN202110008852.5A patent/CN112795916A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012119947A1 (en) * | 2011-03-04 | 2012-09-13 | Nv Bekaert Sa | Method to produce a sawing bead |
| CN111139464A (en) * | 2019-12-05 | 2020-05-12 | 新疆大学 | High-speed wire rod roller repairing method based on laser cladding and repairing structure thereof |
| CN111058035A (en) * | 2019-12-31 | 2020-04-24 | 南京中科煜宸激光技术有限公司 | Process for preparing wear-resistant and corrosion-resistant alloy coating on surface of copper and copper alloy by laser cladding and alloy coating |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113564482A (en) * | 2021-08-04 | 2021-10-29 | 温州东南工业机械实业有限公司 | Improved step pad for rolling mill and surface cladding surfacing process thereof |
| CN115341210A (en) * | 2022-08-16 | 2022-11-15 | 泰尔(安徽)工业科技服务有限公司 | Composite step pad for rolling mill and processing method thereof |
| CN115341210B (en) * | 2022-08-16 | 2023-12-19 | 泰尔(安徽)工业科技服务有限公司 | Composite ladder pad for rolling mill and processing method thereof |
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