CN103276391A - Preparation method for water erosion resistant coating of last-stage long blade - Google Patents
Preparation method for water erosion resistant coating of last-stage long blade Download PDFInfo
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Abstract
The invention belongs to the laser cladding field, relates to a preparation method for a water erosion resistant coating of a last-stage long blade, and particularly relates to a method for preparing a water erosion resistant coating of a last-stage long blade of a large nuclear turbine. The preparation method for the water erosion resistant coating of the last-stage long blade comprises the following steps of drying alloy powder, clamping a blade on a platform with the blade in a horizontal position; selecting a semiconductor laser; adjusting by a coaxially focused powder feeding system; setting the size of a molten pool; and cladding the water erosion resistant coating by the laser. The preparation method can be used in preparing the water erosion resistant coating of the last-stage long blade of the large nuclear turbine. The hardness distribution of a cladding layer is uniform with an up-down deviation within 10% and the hardness of 500 HV; the thermal impact performance and water erosion resistance of the cladding layer are excellent; the deformation of the last-stage long blade after the laser cladding is small; and profile tolerance meets the processing and manufacturing technological requirements of the long blades by nuclear power.
Description
Technical field
The invention belongs to field of laser cladding, relate to the manufacture method of the water-fast erosion resisting coating of a kind of final blades, particularly relate to the method that a kind of laser melting and coating technique prepares the water-fast erosion resisting coating of large nuclear-power steam turbine final blade.
Background technology
The final stage of nuclear power generating sets and time final blades are worked under the wetting vapour condition, because temperature, the pressure of low pressure (LP) cylinder are relatively low, wetting vapour is in operation easily to condense and forms little water droplet, under very high circumferential speed and centrifugal action, water droplet constantly impacts blade, causes the water erosion of vane tip leading edge easily.Blade erosion can cause blade cellular tissue to occur, can make the blade inlet edge edge present spination when serious, form a lot of tiny crackles, even can make the leaf top edge form breach, cause blade fatigue strength to reduce, water erosion develops into the vibration performance that to a certain degree can change blade, causes unit generation judder, and stage efficiency is reduced.The length of nuclear steam turbine last stage blade has reached 1710mm, blade and blade tip circle roll surface speed reaches more than the 500m/s, need the area in anti-water erosion zone to increase greatly than conventional turbine blade, the water erosion problem of the nuclear power low-pressure last stage blade of therefore big leaving area needs to be resolved hurrily.
Carrying on the back arc side soldering stellite alloy film at blade inlet edge is the method that prevents that at present the water erosion of nuclear power last stage blade from the most generally adopting.Because the anti-water erosion region area of nuclear power last stage blade increases, and needs two stellite alloy films of soldering at least, big area high temperature brazing meeting causes welding deformation amount big, the decrease of fatigue strength of blade body material; The seam crossing of adjacent stellite alloy film can produce stress corrosion in addition, causes blade to produce transverse crack along the stellite alloy film gap location; Alloy slice also may take place and come off in last stage blade in the high-speed cruising process, influence unit efficiency.Because there is certain defective in soldering stellite alloy film waterproof etching method, therefore obtain qualified water-fast erosion resisting coating, further improve the anti-water erosion performance of last stage blade and safe reliability, very urgent and crucial.
Laser melting and coating technique is a kind of advanced person's surface protection technique, has obtained promotion and application rapidly in recent years.
Laser melting and coating technique is to add cladding material at substrate surface, utilize the laser beam of high-energy-density to make it to melt simultaneously with the substrate surface thin layer, quick cooled and solidified after the laser beam flying, obtain with the matrix metallurgical binding have that extent of dilution is little, the special cladding layer of dense structure, to reach the purpose of recovering volume and size and surface strengthening.
Find that through the retrieval to existing patent the following patent of utilizing laser melting and coating process that last stage vane of steam turbine is repaired is arranged:
Publication number is " a kind of restorative procedure of last stage vane of steam turbine " that the Chinese invention patent application of CN102031513A provides, and has been characterized in following steps: detect before 1. last stage vane of steam turbine is repaired; 2. last stage vane of steam turbine shape line tempte is made; 3. last stage vane of steam turbine fatigue layer cleaning; 4. damage location laser contour cladding; 5. pincers are repaired shape; 6. repairing the back detects.This invention makes the last stage vane of steam turbine through keeping in repair not need to heat-treat and hot school shape, as long as utilize ready-made molded lines model that blade is carried out correction of the flank shape after the cladding, just has intact shape line, has higher work-ing life simultaneously.
Publication number is " preparation method of last stage vane of steam turbine leading edge surface abrasion resistance non-corrosive alloy coating " that the Chinese invention patent application of CN102453896A provides, be characterized in that laser cladding layer is even, fine and close, form firm metallurgical binding with matrix, coating has good wear-resisting erosion resistance performance, solved traditional method welding and made that the turbine blade leading edge surface heat zone of influence is big, cladding layer thickness is big, organize lax and the flaky problem of layer, specific embodiments is used for the reparation of internal combustion turbine last stage blade leading edge.
Though the technique scheme that prior art provides utilizes laser melting and coating process that last stage vane of steam turbine is repaired, and prepares dense structure, defectives such as flawless, pore, the cladding layer that corrosion resisting property is good has been obtained certain technique effect; But above-mentioned technology only is used for the reparation of blade, at this key part of large nuclear-power steam turbine long blade, can prepare that thinning ratio is low with the conventional laser melting and coating process, good uniformity, the little water-fast erosion layer of distortion, verification by retrieval, domestic beyond example does not still have relevant report abroad yet.Therefore, seek the laser melting and coating process of the water-fast erosion layer in large nuclear-power steam turbine long blade leading edge surface, still need the those skilled in the art further to make creationary research work.
Summary of the invention
The shortcoming of prior art in view of the above the object of the present invention is to provide the manufacture method of the water-fast erosion resisting coating of a kind of large nuclear-power steam turbine final blade, is used for solving the problems of the prior art.
Reach other relevant purposes for achieving the above object, first aspect present invention provides the manufacture method of the water-fast erosion resisting coating of a kind of final blades, comprises the steps:
1) with the powdered alloy drying, and blade is clamped on the platform, blade is horizontal;
2) select semiconductor laser for use, the setting laser track while scan, and regulate defocusing amount, making the laser focusing hot spot is rectangle;
3) coaxial focusing formula powder feed system is regulated: the focal position of powder feeding is overlapped with the focal position of laser beam; Regulate powder feeding gas flow, sending disk of powder rotating speed, protection airshed, make powder feeding evenly continuous, and regulate the make-up gas flow;
4) the molten bath size is set: by infrared enhancing ccd video camera, take bath temperature field picture in the cladding process in real time, the zone that temperature surpasses the powdered alloy fusing point is the zone, molten bath, molten bath area pixel point summation reaction molten bath size; And before laser melting coating, the molten bath pixel of setting reflection molten bath size is controlled variable, adjusts laser power and closed-loop control molten bath size; Described near infrared strengthens ccd video camera, adopts special filter plate to filter visible light and laser, calibrated after, the gray-scale value of photographic images can reflect the temperature value of corresponding points; Described temperature field, near infrared strengthen the gray level image in the molten bath of ccd video camera shooting, become the temperature pattern in the zone, molten bath of constructing behind the temperature value by grayvalue transition; Described threshold values, its value is the fusing point of coating alloy; The pixel summation that described pixel, temperature are higher than threshold values can reflect the size in molten bath;
5) the water-fast erosion resisting coating of laser melting coating: laser beam moves by the short side direction of rectangular light spot, adopt the coaxial synchronous powder feeding system of coaxial focusing formula powder feed system (being about to powdered alloy sends in the molten bath of laser irradiation formation by powder feeder), solidifying formation at blade surface is the cladding layer of metallurgical binding with the blade matrix; In the cladding process, the pixel of reaction molten bath size as controlled variable, is detected temperature field of molten pool in real time, adjusts laser output power, closed-loop control pool size.
The short side direction of described rectangular light spot refers to be parallel to the direction of rectangular light spot minor face (wide), and when laser melting coating, the short side direction of described rectangular light spot is consistent with the long side direction of final blades generally speaking.
Preferably, described powdered alloy is Co-based alloy powder.
Its chemical ingredients of described Co-based alloy powder by weight percentage, comprise following component: C:0.9～1.4%, Si:1.0～1.5%, Ni:2.0～3.5%, Cr:26.0～32.0%, Fe:2.0～3.5%, W:3.0～6.0%, Mo:1.0～1.5%, Mn:0.5～1.0%, all the other are Co.
Preferred, described Co-based alloy powder is selected from the Stellite6 cobalt base alloy.
Preferably, described blade surface carries out pre-treatment, and described preprocessing process comprises the steps: that the surface, blade face carries out oil removing, rust cleaning, and clean with solvent cleaning.
The length of described final blades can reach more than the 1700mm, and surface-area can reach 0.45m
2More than.
Preferred, described solvent is acetone.
Preferably, described semiconductor laser energy density is Gaussian distribution at slow axis for the distribution of top cap, fast axle.
Preferred, described semiconductor laser is 3.5 kilowatts of ROFIN DL 035Q laser apparatus that are installed on robot.
Preferably, in the described step 2, adopt Fanuc trajectory planning and the track while scan of controlling the robot system setting laser.
Described Fanuc trajectory planning and control robot can be regulated and control the track while scan of laser, realize trajectory planning and optimization are carried out in the big area cladding.
Preferably, in the described step 2, hot spot is of a size of length * wide=(1.3～14.0) mm * (0.8～3.0) mm.The above-mentioned minor face of wide i.e. correspondence in the spot size.Preferred, hot spot is of a size of length * wide=(3.2～3.3mm) * 2.0mm.
Preferably, in the described step 3, the protection airshed is 10～20L/min, and powder feeding steam flow amount is 5～15L/min, and tail wind drift amount is 5～15L/min, and the sending disk of powder rotating speed is 6～15r/min.
Preferably, in the described step 4, the molten bath size is corresponding with the size of hot spot, and its molten bath size is about [π * (long+wide)]/2.
Preferably, in the described step 5, laser power is 350～3500W; Laser scanning speed V=10～20mm/s, overlapping rate are 40～50%; Cladding layer thickness is 0.8～3.5mm.Preferred, cladding layer thickness is 2.5～3.0mm.
Preferably, in the described step 5, also carry out the track while scan school in the cladding process and transfer: adopt the Fanuc trajectory planning with the control robot system run trace of laser beam to be carried out the school between the cladding layer road and transfer.
Preferably, also comprise flaw detection step behind the laser melting coating after the described step 5, use infiltration and radiographic test method that the blade cladding layer is checked.Display size is no more than 0.5mm, and linear discontinuities does not allow.
Second aspect present invention provides the manufacture method of the water-fast erosion resisting coating of described final blades to make the application in field at the large nuclear-power steam turbine final blade.
The present invention can be used in the manufacture method of water-fast erosion resisting coating of large nuclear-power steam turbine final blade, and the cladding layer Hardness Distribution is even, and last lower variation of tolerance is within 10%, and hardness is about 500HV; Cladding layer thermal shock resistance properties and water-fast erosion excellent property; Long blade distortion is very little behind the laser melting coating, and the profile tolerance meets nuclear power long blade processing and manufacturing technical requirements.
Compare with existing anti-water erosion technology, advantage of the present invention comprises: (1) adopts high-power semiconductor laser, and the uniform molten bath of formation temperature avoids cladding layer to be tending towards overheated, cladding layer composition and homogeneous microstructure; (2) introduce the Temperature Feedback Controlling System, improve the stability of cladding process and the controllability of cladding heat; (3) adopt trajectory planning and robot controller system, adjust the laser scanning track, improve the cladding layer quality; (4) cladding layer and blade matrix are metallurgical binding, defectives such as flawless, pore, and (5) cladding layer hardness evenly distributes, and is about 500HV, has good water-fast erosion performance; (6) the invention solves traditional method welding, to make turbine blade leading edge heat affected zone big, and blade is yielding, the big and layer of thinning ratio problem such as come off easily; (7) the present invention can be used for the manufacturing of the water-fast erosion resisting coating in large nuclear-power steam turbine final blade leading edge surface and repairs and make.
Description of drawings
Fig. 1 is the water-fast erosion resisting coating preparation process of nuclear power final blades laser melting coating synoptic diagram among the present invention.
Embodiment
Below by specific specific examples explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification sheets.The present invention can also be implemented or be used by other different embodiment, and the every details in this specification sheets also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
See also Fig. 1.Need to prove, the diagram that provides in the present embodiment only illustrates basic conception of the present invention in a schematic way, satisfy only show in graphic with the present invention in relevant assembly but not component count, shape and size drafting when implementing according to reality, kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also may be more complicated.
Embodiment 1
The present invention is used for the manufacturing of the water-fast erosion resisting coating of large nuclear-power steam turbine low-pressure final stage long blade, and blade material is 0Cr17Ni4Cu4Nb～T6II(17～4PH); Blade length is 1710mm, and powdered alloy is No. 6 cobalt base alloys of Stellite.Technology follows these steps to carry out:
Powdered alloy is chosen with dried bean noodles dry: choose No. 6 Co-based alloy powders of Stellite, to powder ball milling 1 hour and 150 ℃ of dryings 1 hour.
Blade surface pre-treatment: blade surface is carried out oil removing, rust cleaning, and clean up with acetone, defective such as require blade surface flawless, pore, be mingled with.
Clamping blade: blade is clamped on the specific mobile platform, blade is horizontal.
Track while scan is set: adopt Fanuc trajectory planning and control robot system, the track while scan of setting laser.
Laser beam is regulated: it is rectangle that the adjusting defocusing amount makes the laser focusing hot spot, spot size: length * wide=3.2mm * 2.0mm.
The adjusting of coaxial focusing formula powder feed system: the focal position of powder feeding is overlapped with the focal position of laser beam; Regulate powder feeding gas flow, sending disk of powder rotating speed, protection airshed, make powder feeding evenly continuous, and regulate the make-up gas flow.The protection airshed is 15L/min, and powder feeding steam flow amount is 7L/min, and tail wind drift amount is 10L/min, and the sending disk of powder rotating speed is 8r/min.
The molten bath size is set: near infrared enhancing ccd video camera is installed is taken bath temperature field picture in the cladding process in real time; Before the laser melting coating, be controlled variable with the molten bath pixel, pixel is 600, and corresponding molten bath size is about [π * (long+wide)]/2, adjusts laser power and closed-loop control molten bath size.
The water-fast erosion resisting coating of laser melting coating: select 3.5 kilowatts of ROFIN DL 035Q semiconductor lasers for use, laser beam moves by the short side direction of rectangular light spot, adopt IWS Coax～coaxial synchronous powder feeding system of 8 nozzles, be about to powdered alloy and send into by powder feeder in the molten bath of laser irradiation formation, solidifying formation at blade surface is the cladding layer of metallurgical binding with the blade matrix.In the cladding process, the pixel of reaction molten bath size as controlled variable, is detected temperature field of molten pool in real time, adjusts laser output power, closed-loop control pool size.
Laser power is 1500W;
Laser scanning speed V=17mm/s, overlapping rate are 50%;
The cladding layer size range is 860mm * 12mm * 2.5mm.
Transfer in the track while scan school: adopt the Fanuc trajectory planning with the control robot system run trace of laser beam to be carried out the school between the cladding layer road and transfer, 15～16 points that the school is transferred on the blade are benchmark.
Flaw detection after the cladding: the blade cladding layer is checked with infiltration and radiographic test method.Display size is no more than 0.5mm, and linear discontinuities does not allow.
Carry out deformation test through the long blade to above-described embodiment, the blade profile tolerance meets nuclear power long blade processing technical requirements processed.Cladding layer is carried out hardness test, and average hardness value is 500HV, and hardness evenly distributes in the cladding layer.Through 80 ℃ of high-pressure water heating bump 24h water erosion tests, cladding layer does not have obvious water erosion phenomenon.The thermal shock experiment result draws the water-fast erosion performance of cladding layer significantly better than 17～4PH stainless steel.
By to nuclear power final blades leading edge cladding stellite layer, can replace soldering hard metal tip waterproof etching technique, make long blade when having good water-fast erosion performance, the hidden danger of having avoided the soldering hard metal tip to come off makes blade operation safety and reliability.
Embodiment 2
The present invention is used for the manufacturing of the water-fast erosion resisting coating of large nuclear-power steam turbine low-pressure final stage long blade, and blade material is 0Cr17Ni4Cu4Nb～T6II(17～4PH); Blade length is 1710mm, and powdered alloy is No. 6 cobalt base alloys of Stellite.Technology follows these steps to carry out:
Powdered alloy is chosen with dried bean noodles dry: choose No. 6 Co-based alloy powders of Stellite, to powder ball milling 1 hour and 150 ℃ of dryings 1 hour.
Blade surface pre-treatment: blade surface is carried out oil removing, rust cleaning, and clean up with acetone, defective such as require blade surface flawless, pore, be mingled with.
Clamping blade: blade is clamped on the specific mobile platform, blade is horizontal.
Track while scan is set: adopt Fanuc trajectory planning and control robot system, the track while scan of setting laser.
Laser beam is regulated: it is rectangle that the adjusting defocusing amount makes the laser focusing hot spot, spot size: length * wide=3.3mm * 2.0mm.
The adjusting of coaxial focusing formula powder feed system: the focal position of powder feeding is overlapped with the focal position of laser beam; Regulate powder feeding gas flow, sending disk of powder rotating speed, protection airshed, make powder feeding evenly continuous, and regulate the make-up gas flow.The protection airshed is 10L/min, and powder feeding steam flow amount is 15L/min, and tail wind drift amount is 15L/min, and the sending disk of powder rotating speed is 6r/min.
The molten bath size is set: near infrared enhancing ccd video camera is installed is taken bath temperature field picture in the cladding process in real time; Before the laser melting coating, be controlled variable with the molten bath pixel, pixel is 1200, and corresponding molten bath size is about [π * (long+wide)]/2, adjusts laser power and closed-loop control molten bath size.
The water-fast erosion resisting coating of laser melting coating: select 3.5 kilowatts of ROFIN DL 035Q semiconductor lasers for use, laser beam moves by the short side direction of rectangular light spot, adopt IWS Coax～coaxial synchronous powder feeding system of 8 nozzles, be about to powdered alloy and send into by powder feeder in the molten bath of laser irradiation formation, solidifying formation at blade surface is the cladding layer of metallurgical binding with the blade matrix.In the cladding process, the pixel of reaction molten bath size as controlled variable, is detected temperature field of molten pool in real time, adjusts laser output power, closed-loop control pool size.
Laser power is 2250W;
Laser scanning speed V=10mm/s, overlapping rate are 50%;
The cladding layer size range is 860mm * 12mm * 3.0mm.
Transfer in the track while scan school: adopt the Fanuc trajectory planning with the control robot system run trace of laser beam to be carried out the school between the cladding layer road and transfer, 15～16 points that the school is transferred on the blade are benchmark.
Flaw detection after the cladding: the blade cladding layer is checked with infiltration and radiographic test method.Display size is no more than 0.5mm, and linear discontinuities does not allow.
Carry out deformation test through the long blade to above-described embodiment, the blade profile tolerance meets nuclear power long blade processing technical requirements processed.Cladding layer is carried out hardness test, and average hardness value is about 450HV, and hardness evenly distributes in the cladding layer.Through 80 ℃ of high-pressure water heating bump 24h water erosion tests, cladding layer does not have obvious water erosion phenomenon.The thermal shock experiment result draws the water-fast erosion performance of cladding layer significantly better than 17～4PH stainless steel.
By to nuclear power final blades leading edge cladding stellite layer, can replace soldering hard metal tip waterproof etching technique, make long blade when having good water-fast erosion performance, the hidden danger of having avoided the soldering hard metal tip to come off makes blade operation safety and reliability.
Embodiment 3
The present invention is used for the manufacturing of the water-fast erosion resisting coating of large nuclear-power steam turbine low-pressure final stage long blade, and blade material is 0Cr17Ni4Cu4Nb～T6II(17～4PH); Blade length is 1710mm, and powdered alloy is No. 6 cobalt base alloys of Stellite.Technology follows these steps to carry out:
Powdered alloy is chosen with dried bean noodles dry: choose No. 6 Co-based alloy powders of Stellite, to powder ball milling 1 hour and 150 ℃ of dryings 1 hour.
Blade surface pre-treatment: blade surface is carried out oil removing, rust cleaning, and clean up with acetone, defective such as require blade surface flawless, pore, be mingled with.
Clamping blade: blade is clamped on the specific mobile platform, blade is horizontal.
Track while scan is set: adopt Fanuc trajectory planning and control robot system, the track while scan of setting laser.
Laser beam is regulated: it is rectangle that the adjusting defocusing amount makes the laser focusing hot spot, spot size: length * wide=3.3mm * 2.0mm.
The adjusting of coaxial focusing formula powder feed system: the focal position of powder feeding is overlapped with the focal position of laser beam; Regulate powder feeding gas flow, sending disk of powder rotating speed, protection airshed, make powder feeding evenly continuous, and regulate the make-up gas flow.The protection airshed is 20L/min, and powder feeding steam flow amount is 5L/min, and tail wind drift amount is 5L/min, and the sending disk of powder rotating speed is 15r/min.
The molten bath size is set: near infrared enhancing ccd video camera is installed is taken bath temperature field picture in the cladding process in real time; Before the laser melting coating, be controlled variable with the molten bath pixel, pixel is 1200, and corresponding molten bath size is about [π * (long+wide)]/2, adjusts laser power and closed-loop control molten bath size.
The water-fast erosion resisting coating of laser melting coating: select 3.5 kilowatts of ROFIN DL 035Q semiconductor lasers for use, laser beam moves by the short side direction of rectangular light spot, adopt IWS Coax～coaxial synchronous powder feeding system of 8 nozzles, be about to powdered alloy and send into by powder feeder in the molten bath of laser irradiation formation, solidifying formation at blade surface is the cladding layer of metallurgical binding with the blade matrix.In the cladding process, the pixel of reaction molten bath size as controlled variable, is detected temperature field of molten pool in real time, adjusts laser output power, closed-loop control pool size.
Laser power is 2250W;
Laser scanning speed V=10mm/s, overlapping rate are 40%;
The cladding layer size range is 860mm * 12mm * 3.0mm.
Transfer in the track while scan school: adopt the Fanuc trajectory planning with the control robot system run trace of laser beam to be carried out the school between the cladding layer road and transfer, 15～16 points that the school is transferred on the blade are benchmark.
Flaw detection after the cladding: the blade cladding layer is checked with infiltration and radiographic test method.Display size is no more than 0.5mm, and linear discontinuities does not allow.
Carry out deformation test through the long blade to above-described embodiment, the blade profile tolerance meets nuclear power long blade processing technical requirements processed.Cladding layer is carried out hardness test, and average hardness value is about 450HV, and hardness evenly distributes in the cladding layer.Through 80 ℃ of high-pressure water heating bump 24h water erosion tests, cladding layer does not have obvious water erosion phenomenon.The thermal shock experiment result draws the water-fast erosion performance of cladding layer significantly better than 17～4PH stainless steel.
By to nuclear power final blades leading edge cladding stellite layer, can replace soldering hard metal tip waterproof etching technique, make long blade when having good water-fast erosion performance, the hidden danger of having avoided the soldering hard metal tip to come off makes blade operation safety and reliability.
In sum, the present invention has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not is used for restriction the present invention.Any person skilled in the art scholar all can be under spirit of the present invention and category, and above-described embodiment is modified or changed.Therefore, have in the technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of finishing under disclosed spirit and the technological thought, must be contained by claim of the present invention.
Claims (8)
1. the manufacture method of the water-fast erosion resisting coating of final blades comprises the steps:
1) with the powdered alloy drying, and blade is clamped on the platform, blade is horizontal;
2) select semiconductor laser for use, the setting laser track while scan, and regulate defocusing amount, making the laser focusing hot spot is rectangle;
3) coaxial focusing formula powder feed system is regulated: the focal position of powder feeding is overlapped with the focal position of laser beam; Regulate powder feeding gas flow, sending disk of powder rotating speed, protection airshed, make powder feeding evenly continuous, and regulate the make-up gas flow;
4) the molten bath size is set: by infrared enhancing ccd video camera, take bath temperature field picture in the cladding process in real time, the zone that temperature surpasses the powdered alloy fusing point is the zone, molten bath, molten bath area pixel point summation reaction molten bath size; And before laser melting coating, the molten bath pixel of setting reflection molten bath size is controlled variable;
5) the water-fast erosion resisting coating of laser melting coating: laser beam moves by the short side direction of rectangular light spot, adopts the coaxial synchronous powder feeding system of coaxial focusing formula powder feed system, and solidifying formation at blade surface is the cladding layer of metallurgical binding with the blade matrix; In the cladding process, the pixel of reaction molten bath size as controlled variable, is detected temperature field of molten pool in real time, adjust laser output power, the constant molten bath size of setting of closed-loop control pool size.
2. the manufacture method of the water-fast erosion resisting coating of a kind of final blades as claimed in claim 1 is characterized in that, described powdered alloy is Co-based alloy powder.
3. the manufacture method of the water-fast erosion resisting coating of a kind of final blades as claimed in claim 1 is characterized in that described blade surface carries out pre-treatment, and described preprocessing process comprises the steps: that the surface, blade face carries out oil removing, rust cleaning, and clean with solvent cleaning.
4. the manufacture method of the water-fast erosion resisting coating of a kind of final blades as claimed in claim 1 is characterized in that, described semiconductor laser energy density is Gaussian distribution at slow axis for the distribution of top cap, fast axle.
5. the manufacture method of the water-fast erosion resisting coating of a kind of final blades as claimed in claim 1 is characterized in that, in the described step 2, hot spot is of a size of length * wide=(1.3～14.0) mm * (0.8～3.0) mm.
6. the manufacture method of the water-fast erosion resisting coating of a kind of final blades as claimed in claim 1 is characterized in that, in the described step 3; the protection airshed is 10～20L/min; powder feeding steam flow amount is 5～15L/min, and tail wind drift amount is 5～15L/min, and the sending disk of powder rotating speed is 6～15r/min.
7. the manufacture method of the water-fast erosion resisting coating of a kind of final blades as claimed in claim 1 is characterized in that, in the described step 5, laser power is 350～3500W, laser scanning speed V=10～20mm/s, overlapping rate are 40～50%, and cladding layer thickness is 0.8～3.5mm.
8. make the application in field at the large nuclear-power steam turbine final blade as the manufacture method of the water-fast erosion resisting coating of the described final blades of the arbitrary claim of claim 1-7.
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| CN103742203A (en) * | 2014-02-11 | 2014-04-23 | 上海电气电站设备有限公司 | Final-stage long blade of steam turbine |
| CN103898502A (en) * | 2014-04-10 | 2014-07-02 | 西安航空动力股份有限公司 | Method for laser cladding of hard alloy coating on crown of turbine blade |
| CN105970021A (en) * | 2016-07-05 | 2016-09-28 | 上海交通大学 | Anti-icing coating and preparing method thereof |
| CN106003490A (en) * | 2016-07-05 | 2016-10-12 | 上海交通大学 | Anti-adhesive coating for surface of plastic mould and preparation method of coating |
| CN109136912A (en) * | 2018-09-11 | 2019-01-04 | 大连理工大学 | A kind of laser melting coating defocusing amount on-line monitoring and negative-feedback state identification method |
| CN109514058A (en) * | 2018-11-23 | 2019-03-26 | 东方电气集团东方汽轮机有限公司 | A kind of anti-water erosion processing method of last stage vane of steam turbine |
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| CN109136912A (en) * | 2018-09-11 | 2019-01-04 | 大连理工大学 | A kind of laser melting coating defocusing amount on-line monitoring and negative-feedback state identification method |
| CN109136912B (en) * | 2018-09-11 | 2020-01-17 | 大连理工大学 | On-line monitoring and negative feedback state identification method for defocusing amount in laser cladding |
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| CN111826555A (en) * | 2020-07-30 | 2020-10-27 | 三门核电有限公司 | Stainless steel equipment laser cladding powder and use method thereof |
| CN113322459A (en) * | 2021-04-28 | 2021-08-31 | 华中科技大学 | Method for preparing particle-reinforced composite coating and product |
| CN113549916A (en) * | 2021-07-22 | 2021-10-26 | 济南大学 | Shot blasting blade forming method based on 3D printing technology and capable of achieving partition structure performance |
| CN113549916B (en) * | 2021-07-22 | 2022-06-17 | 济南大学 | Shot blasting blade forming method based on 3D printing technology and capable of achieving partition structure performance |
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