CN106435565A - Iron-based alloy powder for laser refabrication of rotor journal, and refabrication method thereof - Google Patents
Iron-based alloy powder for laser refabrication of rotor journal, and refabrication method thereof Download PDFInfo
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- CN106435565A CN106435565A CN201610549870.3A CN201610549870A CN106435565A CN 106435565 A CN106435565 A CN 106435565A CN 201610549870 A CN201610549870 A CN 201610549870A CN 106435565 A CN106435565 A CN 106435565A
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- laser
- iron
- rotor journal
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- refabrication
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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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
- Powder Metallurgy (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses an iron-based alloy powder for the laser refabrication of a rotor journal, and a refabrication method thereof. The iron-based alloy powder comprises the following components in weight percentage: 0.03-0.1% of C, 13.0-16.0% of Cr, 0.9-1.5% of Si, 0.5-1.0% of B and iron as the balance. The laser refabrication method comprises the steps of (1) subjecting the failure part of a rotor journal to the lathe machining treatment to enable the surface thereof to be clean and flat, and removing oil; (2) adding the dried iron-based alloy powder into a powder feeder; (3) adjusting the laser position to be within a to-be-repaired region, and editing a program; (4) setting laser process parameters; (5) according to actual needs, repeating the laser cladding process to form multiple cladding layers till the cladding layers exceed a target size and a machining allowance is reserved; (6) turning to reach the target size by a lathe; (7) conducting the hardness and crack detection. According to the invention, the performance of a coating is approximate to the performance of an original new product. Meanwhile, the advantages of wide process adaptability, consistent repeatability and strong operability are realized.
Description
Technical field
The present invention relates to a kind of iron(-)base powder for rotor journal laser remanufacturing and its laser remanufacturing method,
Especially a kind of iron(-)base powder for 28CrMoNiV rotor journal laser remanufacturing, belongs to novel surface coating technology
Use material.
Background technology
Steam turbine is the rotary power machinery that the energy of steam can be converted into mechanical work, is mainly used as generating
Prime mover, also can directly drive other mechanical devices, be widely used in the fields such as petrochemical industry, iron and steel production, electric power facility.
The rotor of 28CrMoNiV material is the common core acting part of industrial steam turbine, needs long-term under the operating mode of superheated vapor
It is on active service.In general, the necked part of rotor is also easy to produce abrasion, axis tile etc. and lost efficacy.Rotor after inefficacy generally adopts turning, spray
The techniques such as painting, Brush Plating are repaired or are directly scrapped.Lost larger using traditional restorative procedure general performance.Directly change one
The cost of root large rotor is very high, and the production cycle is longer.Turbine blade is installed, after dismounting just very on particularly a lot of rotors
Install and use for difficult time, this directly increases the cost of its more exchanging rotor again.Therefore, it is not best for directly more renewing rotor
Maintenance of equipment scheme, is also unsatisfactory for energy-saving requirement.
Therefore it provides a kind of alloying element ratio is reasonable, moderate cost, application effect are notable, be applied to turbine rotor
The iron-based powder of axle journal laser remanufacturing, be this skilled person should set about seeking, one of the problem studied.
Content of the invention
It is an object of the invention to overcoming above-mentioned problem, provide a kind of alloying element ratio rationally, moderate cost, application
Effect is significant, the iron(-)base powder being applied to turbine rotor shaft neck laser remanufacturing and its spraying method.
Iron(-)base powder for rotor journal laser remanufacturing of the present invention is it is characterised in that its constitutive material
Mass percent be：
Carbon C：0.03-0.1%；
Chromium Cr：13.0-16.0%；
Silicon Si：0.9-1.5%；
Boron：0.5-1.0%；
Balance of Fe.
Powder diameter is 40-140um.
Iron(-)base powder for rotor journal laser remanufacturing of the present invention is it is characterised in that its constitutive material
Mass percent be：
Carbon C：0.100%；
Chromium Cr：16.00%；
Silicon Si：1.5%；
Boron：1.0%；
Balance of Fe.
The described iron(-)base powder for rotor journal laser remanufacturing is it is characterised in that the quality of its constitutive material
Percentage is：
Carbon C：0.03%；
Chromium Cr：13.0%；
Silicon Si：0.9%；
Boron：0.5%；
Balance of Fe.
Iron(-)base powder particle diameter is 40-140um.
The spraying method of the iron(-)base powder for rotor journal laser remanufacturing of the present invention, walks including following
Suddenly：
1) first turnery processing is carried out to rotor journal failure site, make surface cleaning, smooth, and oil removing；
2) iron(-)base powder being dried is put in powder feeder；
3) adjustment laser position is to area to be repaired, edit routine；
4) will be as follows for laser technical parameterses setting：To 3.0KW, sweep speed is 4mm/s to laser power, and powder sending quantity is 10g/
Min, laser spot diameter is 50% for 6mm overlapping rate, carries out laser melting coating and remanufactures；
5) repeat cladding multilayer according to actual needs to exceeding target size and leave allowance；
6) adopt lathe turning to target size.
6) adopt lathe turning to target size, you can realize the reparation to rotor journal failure site；
7) hardness and crackle of the rotor journal restoring area after repairing is detected.
Step 7) in using portable hardometer measure rotor journal restoring area average Vickers hardness.
Laser remanufacturing processing performance of the present invention is good, the composition of high temperature resistant, corrosion-resistant, wear-resistant alloy powder
Design principle is：
Carbon C：0.03-0.1%
Carbon can form carbide hard phase with other alloying elements.Carbide is easily assembled in grain boundaries, and carbon content is too high,
The carbide separating out increases, and coating crack sensitiveness strengthens.The hardness simultaneously taking account of coating should be close with matrix hardness, by carbon
Content is set as 0.03-0.1%.In addition, carbon easily reacts generation gas in laser cladding process with oxygen, after the solidification of molten bath, stagnant
Stay formation gas hole defect in cladding layer.Therefore, laser melting coating alloy powder carbon content be difficult too high.
Chromium Cr：13.0-16.0%
Chromium can improve the antioxygenic property of alloy powder, improve laser remanufacturing processing performance, and can improve the anti-of coating
Corrosive nature.When chromium content is less than 13.0%, performance improvement is failed to understand and is thought, more than 16.0% after performance is improved just no longer obvious,
Therefore chromium content is set as 13.0-16.0%.
Silicon Si：0.9-1.5%
In laser remanufacturing technique, silicon can reduce the fusing point of alloy powder, improves the mobility in molten bath and to matrix
Wetability, and combine to form borosilicate with oxygen and boron and be covered in weld pool surface, play the effect of deoxidation slag making, to avoid applying
The oxidation of layer.Silicone content is too low, does not have the effect of deoxidation slag making, and in too high then coating, remaining silicone content increases, coating crack
Sensitiveness strengthens, mechanical degradation, and the effect of silicon and boron simultaneously is to be mutually related, and silicone content will set in conjunction with Boron contents.
Accordingly, as a kind of laser remanufacturing special metals powder, silicone content is set as 0.9-1.5%.
B：0.5-1.0%
During laser remanufacturing, boron combines the effect playing deoxidation slag making with silicon, and meanwhile, it is hard that boron can improve coating
Degree.But Boron contents are too high to significantly reduce coating toughness, the too low effect not having deoxidation slag making it is contemplated that the content of silicon,
Set Boron contents as 0.5-1.0%.
The invention has the beneficial effects as follows：There is provided alloy powder toughness and the antioxygenic property of proportioning good, make again in laser
Do not need during making to substrate preheating and subsequent heat treatment, coating is insensitive to crackle, no special working condition requirement, can close
Obtain the cladding layer similar to matrix 28CrMoNiV performance under suitable parameter, and laser remanufacturing technological operation is flexibly, repeats
Property high, be fully available for the reparation of 28CrMoNiV rotor journal wear out failure and remanufacture.Realize laser using this material to make again
Make rotor method have quick, superior in quality, to rotor fanout free region, after reparation, operational security is reliable, can increase the service life
The advantages of.
Specific embodiment
Embodiment 1：
This batch of powder alloy gross mass is 5.7Kg, and its chemical composition (percentage by weight) is C：0.1%, Cr：
16.0%, Si：1.5%, B：1.0%, Fe：Surplus.Powder diameter after sieving is 40-140um.
A kind of iron(-)base powder occupation mode for 28CrMoNiV rotor shaft neck laser remanufacturing is as follows：
(1) first turnery processing is carried out to rotor journal failure site, make surface cleaning, smooth, and oil removing；
(2) powder being dried is put in powder feeder；
(3) adjustment laser position is to area to be repaired, edit routine.
(4) will be as follows for laser technical parameterses setting：To 3.0KW, sweep speed is 4mm/s to laser power, and powder sending quantity is
10g/min, laser spot diameter is 50% for 6mm overlapping rate, carries out laser melting coating and remanufactures；
(5) repeat cladding multilayer according to actual needs to exceeding target size and leave allowance；
(6) adopt lathe turning to target size, you can realize the reparation to rotor journal failure site；
(7) adopt portable hardometer test after machined, the average Vickers hardness of restoring area is 353Hv, with layer
Number increases, and hardness has downward trend, 4 layers afterwards hardness just almost unchanged, hardness is minimum to be down to 321Hv.Through dye penetrant inspection
Have no crackle.
Embodiment 2：
This batch of powder alloy gross mass is 2.8Kg, and its chemical composition (percentage by weight) is C：0.03%, Cr：
13.0%, Si：0.9%, B：0.5%, Fe：Surplus.Powder diameter after sieving is 40-140um.
Laser in combination manufacturing process comprises the following steps that：
(1)～(5) are with the laser in combination manufacturing technology steps of embodiment 1.
Portable hardometer test is adopted, the average Vickers hardness of restoring area is 307Hv, with the number of plies after machined
Increase, hardness has downward trend, 4 layers afterwards hardness just almost unchanged, hardness is minimum to be down to 286Hv., through dye penetrant inspection not
See crackle.
Embodiment 3-7：
The same embodiment of implementation steps (1) and (2).Batch alloy powder total amount, chemical composition, powder diameter and coating hardness
It is shown in Table 1.
Table 1 embodiment 3-7
Content described in this specification embodiment is only enumerating of the way of realization to inventive concept, the protection of the present invention
Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention also includes art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (5)
1. it is used for the iron(-)base powder of rotor journal laser remanufacturing it is characterised in that described alloy powder is joined by following quality
The raw material composition of ratio：
Carbon：0.03-0.1%；
Chromium：13.0-16.0%；
Silicon：0.9-1.5%；
Boron：0.5-1.0%；
Balance of iron.
2. it is used for the iron(-)base powder of rotor journal laser remanufacturing as claimed in claim 1 it is characterised in that it forms
The mass percent of raw material is：
Carbon：0.1%；
Chromium：16.0%；
Silicon：1.5%；
Boron：1.0%；
Balance of iron.
3. it is used for the iron(-)base powder of rotor journal laser remanufacturing as claimed in claim 1 it is characterised in that it forms
The mass percent of raw material is：
Carbon：0.03%；
Chromium：13.0%；
Silicon：0.9%；
Boron：0.5%；
Balance of iron.
4. the fe-based alloy powder for rotor journal laser remanufacturing as described in claims 1 to 3 any one claim
End it is characterised in that：The particle diameter of iron(-)base powder is 40-140 μm.
5. the iron(-)base powder for rotor journal laser remanufacturing as described in claim 1 any one claim
Laser remanufacturing method, comprises the following steps：
1) first turnery processing is carried out to rotor journal failure site, make surface cleaning, smooth, and oil removing；
2) iron(-)base powder being dried is put in powder feeder；
3) adjustment laser position is to area to be repaired, edit routine；
4) will be as follows for laser technical parameterses setting：To 3.0KW, sweep speed is 4mm/s to laser power, and powder sending quantity is 10g/min,
Laser spot diameter is 50% for 6mm overlapping rate, carries out laser melting coating and remanufactures；
5) repeat cladding multilayer according to actual needs to exceeding target size and leave allowance；
6) adopt lathe turning to target size, you can realize the reparation to rotor journal failure site；
7) hardness and crackle of the rotor journal restoring area after repairing is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610549870.3A CN106435565A (en) | 2016-07-08 | 2016-07-08 | Iron-based alloy powder for laser refabrication of rotor journal, and refabrication method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610549870.3A CN106435565A (en) | 2016-07-08 | 2016-07-08 | Iron-based alloy powder for laser refabrication of rotor journal, and refabrication method thereof |
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| CN106435565A true CN106435565A (en) | 2017-02-22 |
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| CN201610549870.3A Pending CN106435565A (en) | 2016-07-08 | 2016-07-08 | Iron-based alloy powder for laser refabrication of rotor journal, and refabrication method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108555277A (en) * | 2018-04-19 | 2018-09-21 | 杭州盛镭激光科技有限公司 | A kind of cobalt-based alloy powder powder material for turbine blade Laser Alloying Treatment |
| CN108620809A (en) * | 2018-05-11 | 2018-10-09 | 岳阳大陆激光技术有限公司 | The online restorative procedure of 1000MW generating set turbine rotor packing axle journals |
| CN109536945A (en) * | 2018-11-30 | 2019-03-29 | 成都大陆激光技术有限公司 | A method of repairing generator rotor shaft neck |
| CN110157977A (en) * | 2019-04-25 | 2019-08-23 | 浙江工业大学 | Iron-based alloy powder for laser remanufacturing and repairing as well as preparation method and application thereof |
| CN110230050A (en) * | 2019-04-25 | 2019-09-13 | 浙江工业大学 | Iron-based alloy powder for laser cladding and preparation method and application thereof |
| CN113789469A (en) * | 2021-08-09 | 2021-12-14 | 河钢工业技术服务有限公司 | Metal powder for repairing continuous casting crystallizer foot roller through laser cladding and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108555277A (en) * | 2018-04-19 | 2018-09-21 | 杭州盛镭激光科技有限公司 | A kind of cobalt-based alloy powder powder material for turbine blade Laser Alloying Treatment |
| CN108620809A (en) * | 2018-05-11 | 2018-10-09 | 岳阳大陆激光技术有限公司 | The online restorative procedure of 1000MW generating set turbine rotor packing axle journals |
| CN109536945A (en) * | 2018-11-30 | 2019-03-29 | 成都大陆激光技术有限公司 | A method of repairing generator rotor shaft neck |
| CN110157977A (en) * | 2019-04-25 | 2019-08-23 | 浙江工业大学 | Iron-based alloy powder for laser remanufacturing and repairing as well as preparation method and application thereof |
| CN110230050A (en) * | 2019-04-25 | 2019-09-13 | 浙江工业大学 | Iron-based alloy powder for laser cladding and preparation method and application thereof |
| CN113789469A (en) * | 2021-08-09 | 2021-12-14 | 河钢工业技术服务有限公司 | Metal powder for repairing continuous casting crystallizer foot roller through laser cladding and preparation method thereof |
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Application publication date: 20170222 |