CN100505476C - Electric power generator, steam turbine rotor spindle repaired by laser and repairing method thereof - Google Patents
Electric power generator, steam turbine rotor spindle repaired by laser and repairing method thereof Download PDFInfo
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- CN100505476C CN100505476C CNB2004100214717A CN200410021471A CN100505476C CN 100505476 C CN100505476 C CN 100505476C CN B2004100214717 A CNB2004100214717 A CN B2004100214717A CN 200410021471 A CN200410021471 A CN 200410021471A CN 100505476 C CN100505476 C CN 100505476C
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Abstract
The present invention provides a laser repaired power generator and turbine rotor shaft, on its matrix surface on alloy covering layer which can be mutually merged with matrix surface and is different from matrix completely in components is formed, and on the surface where the matrix and alloy layer are connected a micromolten layer whose thickness is 0.05-0.1 mm is formed, and said alloy covering layer is nickel base, cobalt base or iron base alloy. Said invention also provides a laser repairing method of the described power generator and turbine rotor shaft. It adopts a pre-set laser melt-covering mode, and its technological parameters are: laser power 1200-2000 W, spot diameter 2-6 mm and spot moving speed 2-20 mm/s.
Description
Technical field:
The present invention relates to generator, steam turbine rotor shaft and restorative procedure thereof.
Background technology:
Steam turbine, the generator rotor shaft volume is big, weight is big, and accuracy class height, complex manufacturing technology production cost height, cycle are long.And in case its influence that goes wrong of being in operation is huge.So the design of such rotor is design infinite life, promptly under normal process conditions, can turns round continuously and use more than 20 years.
The manufacturing process that armature spindle is general has monobloc forging formula, sleeve type, composite type and welded type.Any version no matter, its quality requirement is all than higher. owing under high temperature, high rotating speed, work, require material that higher creep limit, good rupture life strength and thermal fatigue resistance and fracture property are preferably arranged. the unit that capacity is big more, the requirement of these technical indicators is just strong more.
So for the manufacture process of rotor from smelting, forging, the machine of material add, operations such as heat treatment, dynamic balancing all have clear and definite, strict quality requirement. the manufacturing cost of a roots rotor axle is very expensive, and the manufacturing cycle is also very long.Therefore, be in operation, in a single day rotor goes wrong, and its consequence is very serious.If make again, all be that power plant institute is unaffordable from the duration to the cost.Therefore, must take certain mode to keep in repair.
But no matter be various thermal processing methods such as electric welding, argon arc welding, vibration weldering, all can inevitably crack, injurious effects such as heat affected area tissue inter-variable, residual stress.
In the past, two kinds of solutions were generally arranged: 1, brush plating; 2, diameter of axle car is thin, galleting tile again.These two kinds of methods all have bigger defective.
Though the method that diameter of axle car is thin has temporarily solved problem, and the diameter of axle is attenuated, intensity reduces, and its harm is conspicuous.
Brush plating is power plant's restorative procedure comparatively commonly used in recent years, has also solved certain problem for power plant really.But its limitation is very big.Such as it be utilize principle,displacement with the metal in the metallic solution attached to diameter of axle surface, its combining form is physical bond, its bond strength is very low.Therefore in actual use, the phenomenon that brushing coating comes off appears.What general brush plating was adopted is the copper plating, and its bond strength is better, but case hardness is low, continues wearing and tearing after the position brush plating of wearing and tearing, so reduction is arranged useful life.Such as we directly are exactly the position that is worn again after original brush plating is repaired at the sealing bearing bush that Huaiyin power plant repairs.
Summary of the invention:
The generator, the steam turbine rotor shaft that the purpose of this invention is to provide a kind of laser repairing, its molded layer and matrix are metallurgical binding, and bond strength is not less than 90% of former base material.
The invention provides a kind of generator, steam turbine rotor shaft of laser repairing, it is characterized in that: described generator, steam turbine rotor shaft local or all matrix surfaces be formed with mutual fusion and have a alloy clad with the complete heterogeneity of matrix; There is little crucible zone on the surface that matrix and alloy-layer join, and thickness is 0.05～0.1mm; Alloy clad is Ni-based, cobalt-based or ferrous alloy.
The generator of laser repairing provided by the invention, steam turbine rotor shaft, its alloy clad can be made of nickel-base alloy bottom, cobalt-base alloys surface layer; The bottom of nickel-base alloy and matrix wettability are good, bond strength is high, and the surface layer of cobalt-base alloys has higher creep limit, good rupture life strength and thermal fatigue resistance and fracture property preferably., to satisfy the condition of work of generator, steam turbine rotor shaft.
The generator of laser repairing provided by the invention, steam turbine rotor shaft, the composition of its nickel-base alloy be, percentage by weight, and Cr 20～25, Mo 4～6, W 2～5, surplus are Ni.
The generator of laser repairing provided by the invention, steam turbine rotor shaft can also contain one or more of Al, Ti, C, B in the described nickel-base alloy, these composition total weight percentage compositions are 0～3.5.
The generator of laser repairing provided by the invention, steam turbine rotor shaft, the composition of its cobalt-base alloys be, percentage by weight, and Cr 20～25, W 4～6, C 0.1～0.5, surplus is Co.
The generator of laser repairing provided by the invention, steam turbine rotor shaft can also contain one or more of N, Si, Nd in the described cobalt-base alloys, these composition total weight percentage compositions are 0～0.4.
The present invention also provides the laser repair method of a kind of described generator, steam turbine rotor shaft, adopts the mode that presets laser melting coating, it is characterized in that laser technical parameters is:
Laser power 1200～2000W;
Spot diameter φ 4mm;
Hot spot translational speed 5～16mm/s.
The advantage of generator provided by the invention, steam turbine rotor shaft and laser repair method thereof is:
The laser melt-casting coating of generator, steam turbine rotor shaft and matrix are metallurgical binding, and bond strength is not less than 90% of former base material;
The basis material of generator, steam turbine rotor shaft surface of the work in laser processing procedure is little molten, and little crucible zone is 0.05～0.1mm, and the matrix heat affected area is minimum, is generally 0.1～0.2mm;
The molded layer of generator, steam turbine rotor shaft and matrix all do not have thick cast sturcture, molded layer and Interface Microstructure densification thereof, and crystal grain is tiny, does not have defectives such as hole, slag inclusion, crackle;
The substrate temperature of generator, steam turbine rotor shaft is no more than 80 ℃ in the laser processing procedure, and generator, steam turbine rotor shaft do not have thermal deformation after the laser processing;
The laser casting technological controllability is good, easily realizes automation control;
There are higher creep limit, good rupture life strength and thermal fatigue resistance and fracture property preferably in the repair layer surface of generator, steam turbine rotor shaft, to satisfy the condition of work of generator, steam turbine rotor shaft.
Embodiment:
Embodiment 1 200MW steam turbine mesolow armature spindle
About 20 tons of rotor weight, length is 6m, maximum rotating diameter (exhaust stage blade) 2.4m, the armature spindle material is 25Cr2Ni4MoV, trunnion diameter dimension φ 300mm, damage width 250mm, maximum lesion depths is more than the 1mm.Add the removal fatigue layer through machine; With weight percent content be: the alloyed powder of Cr20, Mo4, W3.5, surplus Ni and percentage by weight are: the alloyed powder of Cr20, W4, C0.5, surplus Co is the laser melting coating reparation respectively, the technological parameter of laser melting coating is: laser power 1500W, spot diameter φ 4mm, hot spot translational speed 10mm/s; Machine adds complex again, and is qualified by inspection.Through various tests, its hardness number reaches HB240～260 that primitive axis hardness requires, and nondestructive inspection detects does not have defectives such as hole, slag inclusion, crackle.The Metallographic Analysis result, cladding layer is organized as fine and close austenite structure.Running through the time more than 1 year does not come off, bad phenomenon such as peeling produces, and works well.
Embodiment 2 300MW generator rotor shafts
About 40 tons of rotor weight, length is 7m, the armature spindle material is 30CrNiMo, trunnion diameter dimension φ 450mm, damage width 80mm, maximum lesion depths is more than the 1mm.Add the removal fatigue layer through machine; With weight percent content be: alloyed powder and the percentage by weight of Cr 20, Mo 4, W 5, Al 0.8, C 0.2, surplus Ni are: the common laser melting coating reparation of alloyed powder of Cr 20, W 4, C 0.1, Nd 0.3 surplus Co, the technological parameter of laser melting coating is: laser power 1800W, spot diameter φ 4mm, hot spot translational speed 5mm/s; Machine adds complex again.Qualified by inspection.Through various tests, its hardness number reaches HB260～280 that primitive axis hardness requires, and nondestructive inspection detects does not have defectives such as hole, slag inclusion, crackle.The Metallographic Analysis result, cladding layer is organized as fine and close austenite structure.Running through the time more than 1 year does not come off, bad phenomenon such as peeling produces, and works well.
Embodiment 3 50MW generator rotor shafts
26 tons of rotor weights, length are 6m, and the armature spindle material is 34Cr2Ni4MoV, sealing gland axle journal diameter dimension φ 420mm, and damage width 50mm, maximum lesion depths is 0.8mm.Add the removal fatigue layer through machine; With weight percent content be: the alloyed powder of Cr25, Mo4, W5, B0.5, surplus Ni and percentage by weight are: the common laser melting coating reparation of the alloyed powder of Cr25, W4, C0.2, N0.1, surplus Co, the technological parameter of laser melting coating is: laser power 1200W, spot diameter φ 4mm, hot spot translational speed 8mm/s; Machine adds complex again.Qualified by inspection.Through test, its hardness number reaches HB260～300 that primitive axis hardness requires, and nondestructive inspection detects does not have defectives such as hole, slag inclusion, crackle.The Metallographic Analysis result, cladding layer is organized as fine and close austenite structure.Running through the time more than 3 years does not come off, bad phenomenon such as peeling produces, and works well.
Embodiment 4 300MW steam turbine low-pressure armature spindles
About 45 tons of rotor weight, length is 8m, maximum rotating diameter (exhaust stage blade) 3.7m, the armature spindle material is 34Cr2Ni4MoV, trunnion diameter dimension φ 480mm, damage width 480mm, maximum lesion depths is more than the 2mm.Add the removal fatigue layer through machine; With weight percent content be: alloyed powder and the percentage by weight of Cr 25, Mo8, W2, Ti3.5 surplus Ni are: the alloyed powder of Cr 20, W 8, C 0.1, Si 0.4, surplus Co is the laser melting coating reparation respectively, the technological parameter of laser melting coating is: laser power 2000W, spot diameter φ 4mm, hot spot translational speed 15mm/s; Machine adds complex again.Qualified by inspection.Through various tests, its hardness number reaches HB260～280 that primitive axis hardness requires, and nondestructive inspection detects does not have defectives such as hole, slag inclusion, crackle.The Metallographic Analysis result, cladding layer is organized as fine and close austenite structure.Running through the time more than 2 years does not come off, bad phenomenon such as peeling produces, and works well.
Embodiment 5 boiler water feeding pump shafts
About 2 tons of water supply pump rotor weight, length is 3m, maximum rotating diameter (exhaust stage blade) 0.8m, the armature spindle material is 40Cr, trunnion diameter dimension φ 140mm, damage width 100mm, maximum lesion depths is more than the 2mm.Add the removal fatigue layer through machine; Use percentage by weight, Cr 18, Mo 3, Ni 4 surpluses are the alloy powder cladding of Fe, and the technological parameter of laser melting coating is: laser power 1800W, spot diameter φ 4mm, hot spot translational speed 16mm/s; Machine adds complex again.Qualified by inspection.Through various tests, its hardness number reaches HB260～280 that former main shaft diameter hardness requires, and nondestructive inspection detects does not have defectives such as hole, slag inclusion, crackle.Running through the time more than 2 years does not come off, bad phenomenon such as peeling produces, and works well.
Claims (6)
1, a kind of generator of laser repairing, steam turbine rotor shaft is characterized in that: described generator, steam turbine rotor shaft local or all matrix surfaces be formed with mutual fusion and have a alloy clad with the complete heterogeneity of matrix; There is little crucible zone on the surface that matrix and alloy-layer join, and thickness is 0.05～0.1mm; Alloy clad is Ni-based, cobalt-based or ferrous alloy.
2, according to generator, the steam turbine rotor shaft of the described laser repairing of claim 1, it is characterized in that: described alloy clad is made of nickel-base alloy bottom and cobalt-base alloys surface layer.
3, according to generator, the steam turbine rotor shaft of claim 1 or 2 described laser repairing, it is characterized in that: the composition of described nickel-base alloy is, percentage by weight, and Cr20～25, Mo4～6, W2～5, surplus are Ni.
4, according to generator, the steam turbine rotor shaft of claim 1 or 2 described laser repairing, it is characterized in that: the composition of described cobalt-base alloys is, percentage by weight, and Cr20～25, W4～6, C0.1～0.5 surplus are Co.
5, according to generator, the steam turbine rotor shaft of the described laser repairing of claim 1, it is characterized in that: the composition of described ferrous alloy is, percentage by weight, and Cr18, Mo3, Ni4, surplus is Fe.
6, the laser repair method of the described generator of a kind of claim 1, steam turbine rotor shaft adopts the mode that presets laser melting coating, it is characterized in that laser technical parameters is:
Laser power 1200～2000W;
Spot diameter φ 4mm;
Hot spot translational speed 5～16mm/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100214717A CN100505476C (en) | 2004-03-26 | 2004-03-26 | Electric power generator, steam turbine rotor spindle repaired by laser and repairing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100214717A CN100505476C (en) | 2004-03-26 | 2004-03-26 | Electric power generator, steam turbine rotor spindle repaired by laser and repairing method thereof |
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| CN1674408A CN1674408A (en) | 2005-09-28 |
| CN100505476C true CN100505476C (en) | 2009-06-24 |
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Assignee: Yueyang Dalu Laser Technology Co., Ltd. Assignor: Dalu Laser Technology Co., Ltd., Shenyang Contract record no.: 2011430000093 Denomination of invention: Electric power generator, steam turbine rotor spindle repaired by laser and repairing method thereof Granted publication date: 20090624 License type: Exclusive License Open date: 20050928 Record date: 20110629 |
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