CN106567071A - Low roller deformation hot roller laser repair method - Google Patents
Low roller deformation hot roller laser repair method Download PDFInfo
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- CN106567071A CN106567071A CN201510666310.1A CN201510666310A CN106567071A CN 106567071 A CN106567071 A CN 106567071A CN 201510666310 A CN201510666310 A CN 201510666310A CN 106567071 A CN106567071 A CN 106567071A
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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
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- 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
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
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- 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
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- 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
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Abstract
The present invention relates to a low roller deformation hot roller laser repair method, wherein a transition alloy layer, an intermediate alloy layer and a surface alloy layer are sequentially subjected to laser cladding on the surface of a hot roller from the inner layer, the components of the alley powder used by the transition alloy layer comprise, by mass, 0.2-0.3% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, 7-8% of Cr and the balance of Ni, the components of the alley powder used by the intermediate alloy layer comprise, by mass, 0.4-0.5% of C, 3.8-4.3% of Si, 12-13% of B, 2.5-3.2% of Fe, 10-12% of Cr and the balance of Ni, and the components of the alley powder used by the surface alloy layer comprise, by mass, 0.05-0.1% of C, 3.0-3.16% of Si, 2-4% of Fe, 16-19% of Cr, 27-30% of Mo, and the balance of Co. According to the present invention, the hot roller repaired by using the hot roller laser repair method of the present invention has good abrasion resistance, good corrosion resistance and good thermal rigidity of the surface, has good toughness and good strength of the internal, and has good laser cladding effect.
Description
Technical field
The present invention relates to a kind of laser cladding method, especially a kind of laser cladding method of hot roll.
Background technology
Roll is the first big consumptive material of China's metallurgy industry, and hot roll is even more one of main consumption spare part in Rolling production, and its consumption is far longer than cold roll.Hot rolling roll consumption is about the 5%～15% of Rolling production cost.Hot roll quality is not only related to Rolling production cost and milling train production operational availability, and mill bar quality is also affected to a great extent.With the development of steel rolling technology, rolling mill speed and automaticity are improved constantly, and wearability, intensity and toughness to hot roll quality, particularly hot roll etc. are put forward higher requirement.
The visible trend of hot roll material development is to widely use alloying element and gradually step up alloying level.Hot-strip finish rolling leading portion is developed into the half steel work roll of the sixties by the high Ni-Cr infinite cold hardness cast iron roll of the thirties in 20th century, begin to use high-chromium iron-cast roller and cast steel with high chromium roll the seventies, the material for beginning to use high-speed steel roll, hot roll the end of the eighties is constantly improved.Hot roll material will not only have good wearability, also have high temperature hardness, and matrix is austenite, martensite, thus its hardness and toughness combination are preferable.Hot rolling roller surface can generate the oxide-film of one layer of densification and the chromium of flexible, the quantity and depth of fire check can be reduced, with preferable heat crack resistance.Its overall mechanical properties, heat treatment performance all improve a lot, and have complied with the demand in market.
The form of hot roll loss failure is mainly worn and torn and because of the fatigue failure produced under long term high temperature, high pressure, the such as change of the reduction of hardness, fatigue crack, peeling, deformation and dimension wears.Hot roll built-up welding due to due to material is all very poor, the defects such as crackle, pore, hardness deficiency will easily occurs using common overlaying method, and the roll repair welding for making this material type gets into a difficult position.How to extend the service life of hot roll, effectively repair the key that destroyed area is reduction roller consumption.
Laser melting coating refers to that selected coating material Jing laser irradiation is placed on by cladding matrix surface with adding material mode is allowed to be melted simultaneously with matrix surface a thin layer, and it is extremely low that dilution factor is formed after rapid solidification, with matrix into metallurgical binding face coat, wear-resisting, anti-corrosion, heat-resisting, anti-oxidant and electrical characteristic the process of substrate surface is significantly improved, so as to reach the purpose that surface is modified or repairs.With built-up welding, spraying, plating and gas phase sedimentary facies ratio, there is laser melting coating little dilution factor, dense structure, coating and matrix to be combined, the features such as be adapted to many cladding materials, granularity and big changes of contents.How laser melting and coating technique is effectively applied to into hot roll surface reconditioning, is the problem that those skilled in the art needs to solve.
The content of the invention
The technical problem to be solved in the present invention be to provide a kind of surface tool after repairing have good wearability, corrosion resistance, thermohardening, and toughness and intensity, the laser repair method of the good hot roll of laser melting coating effect are taken into account in inside.
The present invention is that a kind of technical scheme for solving above-mentioned technical problem proposition is：A kind of laser repair method of hot roll, in one layer of transition alloy layer of surface laser cladding of hot roll, one layer of intermediate alloy layer of laser melting coating on the transition alloy layer, the laser melting coating layer of surface alloy-layer on the intermediate alloy layer；The component and mass percentage content of the alloy powder that the transition alloy layer is adopted is C：0.2%～0.3%, Si：3.2%～3.6%, B：1.2%～1.8%, Fe：2.2%～2.6%, Cr：7%～8%, remaining is Ni；The component and mass percentage content of the alloy powder that the intermediate alloy layer is adopted is C：0.4%～0.5%, Si：3.8%～4.3%, B：12%～13%, Fe：2.5%～3.2%, Cr：10%～12%, remaining is Ni；The component and mass percentage content of the alloy powder that the surface alloying layer is adopted is C：0.05%～0.1%, Si：3.0%～3.16%, Fe：2%～4%, Cr：16%～19%, Mo：27%～30%, remaining is Co.
In order that intermediate alloy layer and transition alloy layer will not because of the hardness of blocked up impact hot rolling roller surface, a kind of above-mentioned technical scheme preferably：The thickness of above-mentioned surface alloying layer is more than the thickness of the intermediate alloy layer, and the thickness of the intermediate alloy layer is more than the thickness of transition alloy layer.
A kind of above-mentioned technical scheme is further preferred that：The thickness of above-mentioned surface alloying layer is 1.5 times～3 times of the thickness of the intermediate alloy layer, and the thickness of the intermediate alloy layer is 1.2 times～2 times of transition alloy layer thickness.
Laser melting coating carries out continuous helical feeding overlap joint scanning to hot roll by the way of preset powder feeding by light source of fast-transverse-flow CO2 laser；Laser power is 2150W to 2200W, and absolute altitude is 235mm to 240mm, and spot size is 12mm × 1.8mm, and sweep speed is 120mm/min to 150mm/min, and amount of lap is 3mm, and powder sending quantity is 6g/min to 12g/min.
Before laser melting coating, the dust on hot roll, greasy dirt, corrosion are removed；The size at each position of detection hot roll, determines failure site and its wear extent；Radial direction, end face run-out inspection are carried out to hot roll, the deflection of roll is checked；Fatigue layer 0.5mm at roll failure position is removed by polishing, and is cleaned.The size at each position, determines failure site and its wear extent；Radial direction, end face run-out inspection are carried out to roll, whether inspection roll has metaboly；The fatigue layer at roll failure position is removed by polishing, and is cleaned.
After laser melting coating, hot roll case hardness is detected；Detection hot rolling rolls deformation amount；Hot rolling roller surface is machined；Carry out penetrant inspection, verification.
The present invention has positive effect：
（1）The laser repair method of the hot roll of the present invention utilizes laser melting and coating technique, for the performance requirement that hot roll local or large area are worn and torn according to roll different parts, employ three kinds of different alloy powders, multi-layer classification cladding is carried out, is prevented from cladding process and ensures that performance reduces the probability for cracking again.Transition zone, intermediate layer, top layer are as a result of different alloys, and hardness, toughness, intensity are different, both can guarantee that the toughness and intensity of inside, can guarantee that surface hardness reaches more than 58HRC again, with fabulous wearability, corrosion resistance, thermohardening.The technique adopts broad band laser beam, in hgher efficiency.The technique controls powder sending quantity by the way of preset powder feeding, strictly, and laser power, sweep speed, amount of lap etc. are optimized so that the structural homogenity of cladding layer is good, thickness and hardness are uniform.The technique causes that the fusion rate of cladding layer and the matrix of hot roll failure site is high, is tightly combined, and roll deformation amount is little, and hot rolling roller surface does not have crackle and pore.The service life for improving hot roll is had great importance using the laser repair method of the hot roll of the present invention.
（2）The top layer of the laser repair method of the hot roll of the present invention adopts Co base alloy powders, strict control has been carried out to the proportioning of alloy powder, so that top layer has good corrosion, oxidation and thermohardening, used and hardness requirement with meeting its hot environment, and while with good wetability and self-fluxing nature.
（3）The proportioning of alloy powder of the transition zone and intermediate layer of the laser repair method of the hot roll of the present invention to being adopted has carried out strict control, to make it have good welding characteristic.Also, transition zone is using the slightly lower Ni base alloy powders of hardness, to ensure internal toughness and intensity；Intermediate layer toughness and crushing resistance are not lost using the hardness Ni base alloy powder more slightly higher than transition zone.
Description of the drawings
Fig. 1 is the crystalline phase figure of matrix and transition alloy layer after the hot roll of the embodiment of the present invention 1 is repaired.
Fig. 2 is the crystalline phase figure of transition alloy layer and intermediate alloy layer after the hot roll of the embodiment of the present invention 1 is repaired.
Fig. 3 is the crystalline phase figure of intermediate alloy layer and surface alloying layer after the hot roll of the embodiment of the present invention 1 is repaired.
Fig. 4 is the laser cladding layer cross section crystalline phase figure after the hot roll of the embodiment of the present invention 1 is repaired.
Fig. 5 is the microhardness photo of the laser cladding layer after the hot roll of the embodiment of the present invention 1 is repaired.
Specific embodiment
Embodiment 1
The laser repair method of the hot roll of the present embodiment is comprised the following steps that：
A. hot rolling roller surface to be repaired is pre-processed, hot roll is tested and analyzed.
Dust on hot roll, greasy dirt, corrosion are removed；The size at each position of detection hot roll, determines failure site and its wear extent；Radial direction, end face run-out inspection are carried out to hot roll, whether inspection roll has metaboly；Fatigue layer 0.5mm at roll failure position is removed by polishing, and is cleaned.
B. according to the failure analysis result of hot roll, Optimizing Process Parameters, Multilayer Laser Cladding is carried out.
By the way of preset powder feeding, continuous helical feeding overlap joint scanning is carried out to hot roll by light source of fast-transverse-flow CO2 laser；Laser power is 2150W, absolute altitude（I.e. laser instrument is from the distance between agent, absolute altitude=focal length+defocusing amount）For 240mm, spot size is 12mm × 1.8mm, and sweep speed is 120mm/min, and amount of lap is 3mm, and powder sending quantity is 8g/min.
First the surface laser cladding a layer thickness in hot roll is the transition alloy layer of 1mm, then laser melting coating a layer thickness is the intermediate alloy layer of 2mm on transition alloy layer, and then laser melting coating a layer thickness is the surface alloying layer of 4mm on intermediate alloy layer.
The component and mass percentage content of the alloy powder that transition alloy layer is adopted is C：0.25%, Si：3.5%, B：1.6%, Fe：2.5%, Cr：7.5%, remaining is Ni.
The component and mass percentage content of the alloy powder that intermediate alloy layer is adopted is C：0.45%, Si：3.9%, B：12.3%, Fe：2.9%, Cr：11%, remaining is Ni.
The component and mass percentage content of the alloy powder that surface alloying layer is adopted is C：0.08%, Si：3.1%, Fe：2%, Cr：17.5%, Mo：28%, remaining is Co.
Laser melting coating is multilayer overlap joint continuous sequence, and per layer of per pass disperses layer stress, it is to avoid stress concentration not in same starting point.
C. repair after terminating, detected.
Detection hot roll case hardness；Detection hot rolling rolls deformation amount；Requirement according to drawing is machined to hot rolling roller surface；Detected a flaw, detected whether that pore, slag inclusion, slight crack etc. affect the defect of roll mechanical performance；Verified, whether quality inspection is qualified.
Embodiment 2
The laser repair method of the hot roll of the present embodiment is comprised the following steps that：
A. hot rolling roller surface to be repaired is pre-processed, hot roll is tested and analyzed.
Dust on hot roll, greasy dirt, corrosion are removed；The size at each position of detection hot roll, determines failure site and its wear extent；Radial direction, end face run-out inspection are carried out to hot roll, whether inspection roll has metaboly；Fatigue layer 0.5mm at roll failure position is removed by polishing, and is cleaned.
B. according to the failure analysis result of hot roll, Optimizing Process Parameters, Multilayer Laser Cladding is carried out.
By the way of preset powder feeding, continuous helical feeding overlap joint scanning is carried out to hot roll by light source of fast-transverse-flow CO2 laser；Laser power is 2160W, and absolute altitude is 235mm, and spot size is 12mm × 1.8mm, and sweep speed is 150mm/min, and amount of lap is 3mm, and powder sending quantity is 6g/min.
First the surface laser cladding a layer thickness in hot roll is the transition alloy layer of 1mm, then laser melting coating a layer thickness is the intermediate alloy layer of 1mm on transition alloy layer, and then laser melting coating a layer thickness is the surface alloying layer of 3mm on intermediate alloy layer.
The component and mass percentage content of the alloy powder that transition alloy layer is adopted is C：0.23%, Si：3.4%, B：1.5%, Fe：2.4%, Cr：7.3%, remaining is Ni.
The component and mass percentage content of the alloy powder that intermediate alloy layer is adopted is C：0.42%, Si：3.8%, B：12.2%, Fe：2.8%, Cr：10.8%, remaining is Ni.
The component and mass percentage content of the alloy powder that surface alloying layer is adopted is C：0.06%, Si：3.13%, Fe：2.2%, Cr：17%, Mo：27.5%, remaining is Co.
Laser melting coating is multilayer overlap joint continuous sequence, and per layer of per pass disperses layer stress, it is to avoid stress concentration not in same starting point.
C. repair after terminating, detected.
Detection hot roll case hardness；Detection hot rolling rolls deformation amount；Requirement according to drawing is machined to hot rolling roller surface；Detected a flaw, detected whether that pore, slag inclusion, slight crack etc. affect the defect of roll mechanical performance；Verified, whether quality inspection is qualified.
Embodiment 3
The laser repair method of the hot roll of the present embodiment is comprised the following steps that：
A. hot rolling roller surface to be repaired is pre-processed, hot roll is tested and analyzed.
Dust on hot roll, greasy dirt, corrosion are removed；The size at each position of detection hot roll, determines failure site and its wear extent；Radial direction, end face run-out inspection are carried out to hot roll, whether inspection roll has metaboly；Fatigue layer 0.5mm at roll failure position is removed by polishing, and is cleaned.
B. according to the failure analysis result of hot roll, Optimizing Process Parameters, Multilayer Laser Cladding is carried out.
By the way of preset powder feeding, continuous helical feeding overlap joint scanning is carried out to hot roll by light source of fast-transverse-flow CO2 laser；Laser power is 2200W, and absolute altitude is 240mm, and spot size is 12mm × 1.8mm, and sweep speed is 140mm/min, and amount of lap is 3mm, and powder sending quantity is 12g/min.
First the surface laser cladding a layer thickness in hot roll is the transition alloy layer of 2mm, then laser melting coating a layer thickness is the intermediate alloy layer of 2mm on transition alloy layer, and then laser melting coating a layer thickness is the surface alloying layer of 2mm on intermediate alloy layer.
The component and mass percentage content of the alloy powder that transition alloy layer is adopted is C：0.26%, Si：3.6%, B：1.8%, Fe：2.6%, Cr：7.6%, remaining is Ni.
The component and mass percentage content of the alloy powder that intermediate alloy layer is adopted is C：0.48%, Si：4%, B：12.5%, Fe：3%, Cr：11.2%, remaining is Ni.
The component and mass percentage content of the alloy powder that surface alloying layer is adopted is C：0.07%, Si：3.05%, Fe：2.5%, Cr：18%, Mo：28.5%, remaining is Co.
Laser melting coating is multilayer overlap joint continuous sequence, and per layer of per pass disperses layer stress, it is to avoid stress concentration not in same starting point.
C. repair after terminating, detected.
Detection hot roll case hardness；Detection hot rolling rolls deformation amount；Requirement according to drawing is machined to hot rolling roller surface；Detected a flaw, detected whether that pore, slag inclusion, slight crack etc. affect the defect of roll mechanical performance；Verified, whether quality inspection is qualified.
Hot roll after the laser repair method of the hot roll of the present invention is repaired, the hardness of transition alloy layer is HRC40～50, and the hardness of intermediate alloy layer is HRC50～58, and the hardness of surface alloying layer is HRC58～62, and crystalline phase is as shown in Figure 1 to Figure 3.The top half of Fig. 1 is transition alloy layer, and the latter half is matrix, and both are tightly combined, and the dendrite of transition alloy layer is more thick.The top half of Fig. 2 is intermediate alloy layer, and the latter half is transition alloy layer, and transition between the two is gentle, good with reference to effect, and intermediate alloy layer is thinner than the dendrite of transition alloy layer and organizes finer and close.The top half of Fig. 3 is surface alloying layer, and the latter half is intermediate alloy layer, and transition between the two is gentle, good with reference to effect, and intermediate alloy layer is thinner than the dendrite of transition alloy layer and organizes finer and close.
The cross section of the hot roll laser cladding layer after the laser repair method of the hot roll of the present invention is repaired is as shown in Figure 4.The top half of Fig. 4 is laser cladding layer, and the latter half is matrix, and both tissues are slightly different, and the boundary line between transition alloy layer, intermediate alloy layer, surface alloying layer cannot be differentiated, and illustrates that the combination effect between each laser cladding layer and matrix is preferable.
The hardness of laser cladding layer is gradual change, as shown in Figure 5.The top half of Fig. 5 is laser cladding layer, and the latter half is matrix, what the hardness of transition alloy layer, intermediate alloy layer and surface alloying layer was incremented by.
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.There is no need to be exhaustive to all of embodiment.And among these belong to the obvious change extended out of spirit or variation of the present invention still in protection scope of the present invention.
Claims (6)
1. a kind of laser repair method of hot roll, it is characterised in that：In one layer of transition alloy layer of surface laser cladding of hot roll, one layer of intermediate alloy layer of laser melting coating on the transition alloy layer, the laser melting coating layer of surface alloy-layer on the intermediate alloy layer；
The component and mass percentage content of the alloy powder that the transition alloy layer is adopted is C：0.2%～0.3%, Si：3.2%～3.6%, B：1.2%～1.8%, Fe：2.2%～2.6%, Cr：7%～8%, remaining is Ni；
The component and mass percentage content of the alloy powder that the intermediate alloy layer is adopted is C：0.4%～0.5%, Si：3.8%～4.3%, B：12%～13%, Fe：2.5%～3.2%, Cr：10%～12%, remaining is Ni；
The component and mass percentage content of the alloy powder that the surface alloying layer is adopted is C：0.05%～0.1%, Si：3.0%～3.16%, Fe：2%～4%, Cr：16%～19%, Mo：27%～30%, remaining is Co.
2. the laser repair method of hot roll according to claim 1, it is characterised in that：The thickness of the surface alloying layer is more than the thickness of the intermediate alloy layer, and the thickness of the intermediate alloy layer is more than the thickness of transition alloy layer.
3. the laser repair method of hot roll according to claim 1, it is characterised in that：The thickness of the surface alloying layer is 1.5 times～3 times of the thickness of the intermediate alloy layer, and the thickness of the intermediate alloy layer is 1.2 times～2 times of transition alloy layer thickness.
4. the laser repair method of hot roll according to claim 3, it is characterised in that：Laser melting coating carries out continuous helical feeding overlap joint scanning to hot roll by the way of preset powder feeding by light source of fast-transverse-flow CO2 laser；Laser power is 2150W to 2200W, and absolute altitude is 235mm to 240mm, and spot size is 12mm × 1.8mm, and sweep speed is 120mm/min to 150mm/min, and amount of lap is 3mm, and powder sending quantity is 6g/min to 12g/min.
5. the laser repair method of hot roll according to claim 4, it is characterised in that：Before laser melting coating, the dust on hot roll, greasy dirt, corrosion are removed；The size at each position of detection hot roll, determines failure site and its wear extent；Radial direction, end face run-out inspection are carried out to hot roll, the deflection of roll is checked；The fatigue layer at roll failure position is removed by polishing, and is cleaned.
6. the laser repair method of hot roll according to claim 4, it is characterised in that：After laser melting coating, hot roll case hardness is detected；Detection hot rolling rolls deformation amount；Hot rolling roller surface is machined；Carry out penetrant inspection, verification.
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