CN113718246A - Maritime work platform pile leg laser composite repairing method capable of eliminating cladding layer interface - Google Patents
Maritime work platform pile leg laser composite repairing method capable of eliminating cladding layer interface Download PDFInfo
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- 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
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- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
The invention provides a maritime work platform pile leg laser composite repairing method capable of eliminating a cladding layer interface, which relates to the technical field of laser processing and comprises the steps of extracting a maritime work platform pile leg defect model, machining a defect area to obtain a shape suitable for cladding repair, configuring cladding powder, regulating and controlling laser cladding process parameters, strengthening laser shock, observing an interface eliminating effect through EBSD (electromagnetic brake System), regulating and controlling laser shock process parameters, removing a cladding layer higher than the surface of a part and the like, and the repairing of the damaged part of the maritime work platform pile leg is completed. According to the invention, by selecting the cladding powder with the impedance similar to that of the pile leg substrate of the marine platform, regulating and controlling the cladding process parameters and the impact process parameters, the shock wave generated by laser impact generates large-scale transmission at the position close to the impedance material interface, the crystal grains of the cladding layer and the crystal grains of the interface area between the cladding layer and the pile leg substrate of the marine platform are refined, and the interface is eliminated, so that the integral strength of the repaired pile leg parts of the marine platform is improved.
Description
Technical Field
The invention relates to the technical field of laser processing, in particular to a laser composite repairing method for a maritime work platform pile leg, which can eliminate a cladding layer interface.
Background
As oil and gas exploration and development gradually shifts from land to the ocean, the demand for ocean engineering platforms is increasing day by day. Since the ocean engineering platform works in a severe environment for a long time, the design life and the safety become targets which are continuously pursued by the ocean engineering platform. In various engineering materials, 690 high-strength steel has the advantages of corrosion resistance and high strength, so that the high-strength steel becomes a mainstream structural material of the pile leg of the ocean engineering platform. However, 690 high-strength steel working in a splash zone and a tidal range zone is inevitably corroded by seawater and attached by marine organisms to form a corrosion pit, so that the pile leg structure is unstable, pitting corrosion caused by meshing of a gear or a rack and the like are caused, and potential safety hazards are caused if the corrosion part is irregularly treated.
The laser cladding repair is an advanced manufacturing technology for repairing the defect surface, has the advantages of strong controllability, high efficiency, high automation degree and the like, but also has a plurality of defects caused by technical barriers, and the defects are easy to cause the coarse grains of the cladding repair layer and even cause the defects of the microstructure. The laser impact is used as a new means of surface mechanical treatment, can introduce uniform residual compressive stress on the surface of the repair layer and simultaneously refine grains, and reduces or even eliminates tissue defects, so that the grain size of the cladding repair layer refined by the laser impact technology is very proper and necessary.
The Chinese patent with the publication number of CN104480476B discloses a laser thermal combination remanufacturing method for a metal damaged part, wherein laser shock treatment is carried out after one layer of metal damaged part is cladded and repaired, crystal grains of an integral cladding layer are refined, and defects such as micropores in the cladding layer are overcome. However, the subsequent cladding process can damage the previous laser shock process, the next laser cladding process forms a melting region in the last laser shock strengthening region, the refined crystal grains are recrystallized at high temperature to form large crystal grains, and the laser shock strengthening effect cannot be guaranteed. In addition, in the laser cladding process, due to the existence of the interface, local stress concentration is easy to generate, the service life of the component is influenced, meanwhile, the bonding strength of the cladding layer and the substrate is low, cracking is easy to cause, and the repair of parts cannot achieve the expected effect.
Disclosure of Invention
The invention aims to provide a maritime work platform pile leg laser composite repairing method capable of eliminating a cladding layer interface.
The technical purpose of the invention is realized by the following technical scheme:
a laser composite repairing method for a pile leg of a marine platform capable of eliminating a cladding layer interface specifically comprises the following steps,
s1, extracting a defect model according to the shape, size and depth of the damaged part of the pile leg of the marine platform, and carrying out primary layered design on the pit;
s2, machining the damaged area, removing the damaged surface layer, and machining a repair area with a corresponding shape according to the damaged shape;
s3, preparing special cladding powder for repairing the damaged marine platform pile leg according to the chemical components of the marine platform pile leg substrate; the marine platform pile leg is made of 690 high-strength steel, and a pile leg matrix comprises the following chemical components in percentage by weight: 0.1 to 0.2 percent of carbon, 0.3 to 0.5 percent of silicon, 1.5 to 1.8 percent of manganese, 0.1 to 0.3 percent of phosphorus, 0.01 percent of sulfur, 1.5 to 2.2 percent of chromium, 3.5 to 4 percent of nickel, 0.6 to 0.8 percent of molybdenum, 0.08 percent of vanadium and the balance of iron; the cladding powder comprises the following chemical components in percentage by weight: 0.1 to 0.2 percent of carbon, 0.5 to 0.7 percent of silicon, 1.7 to 2 percent of manganese, 0.1 to 0.3 percent of phosphorus, 0.01 percent of sulfur, 0.1 to 0.2 percent of chromium, 3 to 4.5 percent of nickel, 0.3 to 0.5 percent of molybdenum, 0.05 percent of vanadium and the balance of iron;
s4, milling a circular truncated cone-shaped pit in the center of the defect according to the surface damage shape of the marine platform pile leg, performing laser cladding repair on the pit, forming a cladding layer on the marine platform pile leg substrate, and polishing the cladding layer smoothly; the laser cladding parameters are as follows: the laser pulse width is 15ns, the laser power is 1300W, the spot diameter is 2-4mm, the lap joint rate is 62.5%, the powder feeding rate is 0.4-0.6r/min, the scanning speed is 1000mm/min, and the laser scanning path is spiral from the circumference to the circle center;
s5, performing laser shock strengthening treatment on a cladding layer formed on the maritime work platform spud leg substrate by using laser-cladded cladding powder, eliminating an interface between the cladding layer and the spud leg substrate, and simultaneously checking the proportion of the selected cladding powder and the laser cladding technological parameters by using the eliminating effect of the interface between the cladding layer and the maritime work platform spud leg substrate after laser shock;
s6, detecting the grain characteristic change condition at the interface between the cladding layer and the marine platform pile leg substrate through an EBSD detection technology, and verifying the interface elimination effect between the cladding layer and the marine platform pile leg substrate; if the interface eliminating effect meets the repairing requirement, determining the proportion of cladding powder components and laser cladding process parameters; if the interface elimination effect does not meet the repair requirement, repeating the steps S3-S6, and adjusting the cladding powder component ratio in the step S3 and the laser cladding process parameters in the step S4;
s7, after verifying that the elimination effect of the cladding powder and the laser cladding technological parameters on the interface meets the repair requirement, performing layer-by-layer cladding repair on the pit of the spud leg substrate according to the determined cladding powder component proportion and the laser cladding technological parameters, and regulating and controlling the laser impact technological parameters, wherein once laser impact is performed on the cladding layer every time 2-3 cladding layers are clad until the cladding layer is higher than the surface of the spud leg of the maritime work platform; and polishing the surface of the cladding layer smoothly, and finally carrying out laser shock once, wherein the surface of the treated cladding layer is flush with the surface of the marine platform pile leg, so that the marine platform pile leg is repaired.
Further, the powder particle size of the cladding powder configured in the step S3 is 45-105 μm, and the purity is 99.9%.
Further, in the step S4, during the laser cladding process, nitrogen protection and nitrogen powder feeding are adopted, the protective gas flow rate is 6L/min, and the powder feeding pressure is 0.6 MPa.
Further, in the step S5, the cladding layer thickness of the laser shock peening treatment is 2-3 mm.
Further, in step S5, the power density of the laser shock is selected to be 7.96GW/cm during the laser shock peening process2Medium power density.
Further, in the step S6, during EBSD detection, the FEI Quanta 650 scanning electron microscope and the matched HKL Nord lysNano EBSD probe are used to collect the data of the cross section of the cladding layer after laser impact in the step S5, and the variation of the grain characteristics of the interface region of the cross section of the cladding layer is observed, so as to verify the effect of laser impact on eliminating the interface between the cladding layer and the leg substrate of the marine platform.
Further, in step S7, when adjusting the laser shock process parameters, the laser power density is selected to be 5.31-11.15GW/cm2Impacting 3 times under the same laser power density, wherein the diameter of a light spot is 2-5mm, and the lap joint rate is 25% -90%; during laser shock, an aluminum foil with a thickness of about 0.1mm was used as an absorbing layer and deionized water with a thickness of 2mm was used as a constraining layer.
In conclusion, the invention has the following beneficial effects:
1. the formula and the content of the cladding powder are determined after continuous regulation and control, so that the impedance between a cladding layer formed by laser cladding of the cladding powder and a pile leg substrate of the marine platform is controlled within a small difference value;
2. each layer of the cladding layer has a certain thickness by proper laser cladding process parameters, so that the bonding strength of an interface is guaranteed, and the cladding efficiency is improved;
3. the impedance of a cladding layer is adjusted by regulating and controlling special cladding powder for the pile leg of the marine platform and combining laser cladding process parameters, shock waves generated by laser shock generate reflection and transmission at the interface of similar impedance materials, the proportion of reflection and transmission is controlled by adjusting the parameters of the laser shock, the interfaces between the cladding layer and the pile leg substrate of the marine platform and between the cladding layer and the cladding layer are eliminated, the bonding strength of the cladding layer and the substrate is improved, and the overall repair effect of the cladding layer is improved; and observing the characteristic change condition of interface crystal grains of the cladding layer by an EBSD (electron back scattering) technology, judging whether the interface eliminating effect meets the repairing requirement or not, and ensuring the repairing effect on the damaged part of the pile leg of the marine platform.
Drawings
FIG. 1 is a flow chart of a laser composite repair method for a leg of a marine platform that eliminates a cladding layer interface;
FIG. 2 is a comparison of the interface area between the cladding layer and the leg substrate of the marine platform in the absence of laser shock and in examples one, two and three; wherein (a) is not laser shocked, (b) is embodiment one, (c) is embodiment two, and (d) is embodiment three;
FIG. 3 is a statistical plot of the grain sizes of the upper, middle and bottom cladding layers without laser shock and in examples one, two and three; wherein (1) is not impacted by laser, (2) is embodiment one, (3) is embodiment two, and (4) is embodiment three;
FIG. 4 is a graph of the average grain size at the top, middle and bottom of the cladding layer in the absence of laser shock and in examples one, two and three.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
a laser composite repairing method for a maritime work platform pile leg capable of eliminating a cladding layer interface is shown in figure 1 and specifically comprises the following steps,
s1, extracting a defect model according to the shape, size and depth of the damaged part of the pile leg of the marine platform, and carrying out primary layered design on the pit.
S2, machining the damaged area, removing the damaged surface layer, and machining a repair area with a corresponding shape according to the damaged shape; generally, the depth of a pit which can be processed when the damage of a pile leg of a marine platform needs to be repaired is at least about 5 mm.
S3, preparing special cladding powder for repairing the damaged marine platform pile leg according to the chemical components of the marine platform pile leg base body, wherein the cladding powder and the marine platform pile leg damaged part base body have similar chemical components and contents, and the impedance of the cladding powder and the marine platform pile leg damaged part base body is ensured to be similar. The marine platform pile leg is made of 690 high-strength steel, and the chemical components and the weight percentage of a matrix are as follows: 0.1 to 0.2 percent of carbon, 0.3 to 0.5 percent of silicon, 1.5 to 1.8 percent of manganese, 0.1 to 0.3 percent of phosphorus, 0.01 percent of sulfur, 1.5 to 2.2 percent of chromium, 3.5 to 4 percent of nickel, 0.6 to 0.8 percent of molybdenum, 0.08 percent of vanadium and the balance of iron. The cladding powder comprises the following chemical components in percentage by weight: 0.1 to 0.2 percent of carbon, 0.5 to 0.7 percent of silicon, 1.7 to 2 percent of manganese, 0.1 to 0.3 percent of phosphorus, 0.01 percent of sulfur, 0.1 to 0.2 percent of chromium, 3 to 4.5 percent of nickel, 0.3 to 0.5 percent of molybdenum, 0.05 percent of vanadium and the balance of iron. In addition, the cladding powder has a powder particle size of 45-105 μm and a purity of 99.9%.
In this embodiment, the chemical components and contents of the matrix at the damaged part of the pile leg matrix of the marine platform are specifically as follows: 0.18% of carbon, 0.5% of silicon, 1.6% of manganese, 0.2% of phosphorus, 0.01% of sulfur, 1.5% of chromium, 3.5% of nickel, 0.7% of molybdenum, 0.08% of vanadium and 91.73% of iron. Correspondingly, the cladding powder comprises the following chemical components in percentage by weight: 0.18% of carbon, 0.6% of silicon, 1.8% of manganese, 0.2% of phosphorus, 0.01% of sulfur, 0.14% of chromium, 3.2% of nickel, 0.33% of molybdenum, 0.05% of vanadium and 93.49% of iron, and the powder granularity of the cladding powder is 80 μm.
S4, milling a circular truncated cone-shaped pit in the center of the defect according to the surface damage shape of the marine platform pile leg, performing laser cladding repair on the pit, forming a cladding layer on the marine platform pile leg substrate, and polishing the cladding layer smoothly. The laser cladding parameters are as follows: the laser pulse width is 15ns, the laser power is 1300W, the spot diameter is 2-4mm, the lap joint rate is 62.5%, the powder feeding rate is 0.4-0.6r/min, the scanning speed is 700 mm/min, and the laser scanning path is spiral from the circumference to the circle center. In the laser cladding process, nitrogen protection and nitrogen powder feeding are adopted, the flow rate of protective gas is 6L/min, and the powder feeding pressure is 0.6 MPa. In this embodiment, the laser cladding process parameters are selected from: the laser pulse width is 15ns, the laser power is 1000W, the spot diameter is 2mm, the lap joint rate is 62.5 percent, the powder feeding rate is 0.5 r/min, and the scanning speed is 1000 mm/min.
S5, performing laser shock strengthening treatment on a cladding layer formed on the marine platform spud leg substrate by using laser cladding powder, wherein the power density of laser shock is 7.96GW/cm2The interface between the cladding layer and the pile leg substrate is eliminated by the medium power density, and the selected cladding powder proportion and laser cladding technological parameters are tested by the elimination effect of the interface between the cladding layer and the pile leg substrate of the marine platform after laser impact. Wherein the thickness of the cladding layer subjected to laser shock peening treatment is 2-3mm, and preferably 3 mm. The principle of eliminating the interface by laser shock is that the chemical components of cladding powder are similar to those of a substrate at the damaged part of the pile leg of the marine platform, so that the impedance of the cladding layer is similar to that of the substrate of the pile leg of the marine platform, and laser shock waves are transmitted in a large proportion at the joint interface of the cladding layer and the substrate of the pile leg of the marine platform due to the similar impedance, so that the characteristics of crystal grains can be changed at the joint interface of the cladding layer and the pile leg of the marine platform by laser shock, and the interface between the cladding layer and the substrate of the pile leg of the marine platform is eliminated. Wherein, the grain characteristic change means that the grain in the interface area is continuously refined to form an area with mixed fine grains and no clear boundary, and the fine grains respectively have the respective grain characteristics of the cladding layer and the substrate.
S6, detecting the grain characteristic change condition of the interface between the cladding layer and the marine platform pile leg substrate through an EBSD detection technology, and verifying whether the interface elimination effect between the cladding layer and the marine platform pile leg substrate meets the repair requirement. And collecting the cross section data of the cladding layer subjected to the laser impact in the step S5 by using an FEI Quanta 650 scanning electron microscope and a matched HKL Nord lysNano EBSD probe, and observing the change condition of the grain characteristics of the interface region of the cross section of the cladding layer to verify the interface elimination effect between the cladding layer and the matrix of the damaged part of the leg of the marine platform. If the interface eliminating effect meets the repairing requirement, determining the proportion of cladding powder components and laser cladding process parameters; and if the interface elimination effect between the cladding layer and the maritime work platform spud leg substrate does not meet the repair requirement, repeating the steps S3-S6, and finely adjusting the cladding powder component proportion in the step S3 and the laser cladding process parameters in the step S4. In this embodiment, the interface elimination effect meets the repair requirement by the cladding powder component ratio determined in step S3 and the laser cladding process parameter determined in step S4.
S7, after verifying that the elimination effect of the cladding powder and the laser cladding technological parameters on the interface meets the repair requirement, performing layer-by-layer cladding repair on the pits of the spud leg substrate according to the determined cladding powder component proportion and the laser cladding technological parameters, and regulating and controlling laser impact technological parameters, wherein laser impact is performed on the cladding layer once every three cladding layers are clad until the cladding layer is higher than the surface of the spud leg of the maritime work platform; and polishing the surface of the cladding layer smoothly, and finally carrying out laser shock once, wherein the surface of the treated cladding layer is flush with the surface of the marine platform pile leg, so that the marine platform pile leg is repaired. Wherein, the laser impact technological parameters are regulated and controlled by selecting the laser power density of 5.31-11.15GW/cm2When every three layers of cladding layers are subjected to laser impact once, the cladding layers are impacted for 3 times under the same laser power density, the diameter of a light spot is 2-5mm, and the lap joint rate is 25% -90%. During laser shock, an aluminum foil with a thickness of about 0.1mm was used as an absorbing layer and deionized water with a thickness of 2mm was used as a constraining layer. In this embodiment, the laser power density of 11.15GW/cm is selected in step S72Impact is carried out for 3 times, the diameter of a light spot is 4mm, and the lap joint rate is 50%.
In the damaged part of the offshore platform pile leg repaired by the embodiment, the interface elimination and the grain characteristic change between the cladding layer and the offshore platform pile leg substrate are shown in (b) in fig. 2, and the grain sizes of the upper part, the middle part and the bottom part of the cladding layer are shown in (2) in fig. 3.
Example two:
the difference between this embodiment and the first embodiment is that, in this embodiment, in step S3, the chemical components and weight percentages of the cladding powder are as follows: 0.1% of carbon, 0.5% of silicon, 1.7% of manganese, 0.1% of phosphorus, 0.01% of sulfur, 0.1% of chromium, 3% of nickel, 0.3% of molybdenum, 0.05% of vanadium and 94.14% of iron.
In step S4, the laser cladding process parameters are selected from: the laser pulse width is 15ns, the laser power is 1200W, the spot diameter is 3mm, the lap joint rate is 62.5 percent, the powder feeding rate is 0.4 r/min, and the scanning speed is 800 mm/min.
In step S7, the laser power density is selected to be 7.96GW/cm2Impact is carried out for 3 times, the diameter of a light spot is 5mm, and the lap joint rate is 90%.
In the damaged part of the offshore platform pile leg repaired by the embodiment, the interface elimination and the grain characteristic change between the cladding layer and the offshore platform pile leg substrate are shown in (c) in fig. 2, and the grain sizes of the upper part, the middle part and the bottom part of the cladding layer are shown in (3) in fig. 3.
Example three:
the present embodiment is different from the first and second embodiments in that: in this embodiment, in step S3, the cladding powder includes the following chemical components by weight percent: 0.2% of carbon, 0.7% of silicon, 2% of manganese, 0.3% of phosphorus, 0.01% of sulfur, 0.2% of chromium, 4.5% of nickel, 0.5% of molybdenum, 0.05% of vanadium and 91.54% of iron.
In step S4, the laser cladding process parameters are selected from: the laser pulse width is 15ns, the laser power is 1300W, the spot diameter is 4mm, the lap joint rate is 62.5 percent, the powder feeding rate is 0.6r/min, and the scanning speed is 700 mm/min.
In step S7, laser power density of 5.31GW/cm is selected2Impact is carried out for 3 times, the diameter of a light spot is 2mm, and the lap joint rate is 25%.
In the damaged part of the offshore platform pile leg repaired by the embodiment, the interface elimination and the grain characteristic change between the cladding layer and the offshore platform pile leg substrate are shown in (d) in fig. 2, and the grain sizes of the upper part, the middle part and the bottom part of the cladding layer are shown in (4) in fig. 3.
As shown in fig. 2, 3 and 4, when the cladding powder, the laser cladding process parameters and the laser impact process parameters are specifically configured in the first embodiment, the interface elimination effect between the cladding layer and the leg substrate of the marine platform is the best, and the grain characteristic change effect of the interface region is the most obvious, according to the comparison of the interface region between the cladding layer and the leg substrate of the marine platform in the figures, the statistical conditions of the grain sizes of the upper part, the middle part and the bottom of the cladding layer in the first embodiment, the second embodiment and the third embodiment, and the average grain sizes of the upper part, the middle part and the bottom of the cladding layer in the first embodiment, the second embodiment and the third embodiment. Secondly, in the second embodiment, the interface elimination effect is more obvious, but the grain characteristic variation effect of the interface area is not as good as that of the first embodiment. Finally, the third embodiment is inferior to the first and second embodiments in the effect of eliminating the interface, and the effect of changing the grain characteristics in the interface region is also inferior to the first and second embodiments.
The invention adjusts the impedance of the cladding layer by regulating the special cladding powder for the pile leg of the marine platform and combining with the laser cladding process parameters, shock waves generated by laser shock generate reflection and transmission at the interface of materials with similar impedance, the proportion of reflection and transmission is controlled by adjusting the parameters of laser shock, the grain size of the interface area far away from the shock is obviously thinned while the grain size of the cladding layer is thinned, the interfaces between the cladding layer and the pile leg substrate of the marine platform and between the cladding layer and the cladding layer are eliminated, the bonding strength between the cladding layer and the substrate and between the cladding layer and the cladding layer is enhanced, the strength, plasticity and anisotropy of the repaired materials are improved, and the service performance of the pile leg parts of the marine platform after repair is improved.
For the control of impedance, firstly, a cladding powder formula is regulated, the transmission ratio of shock waves between a cladding layer and a marine platform pile leg matrix is controlled, then, the interface area is detected by means of EBSD and the like, the characteristic change of crystal grains is observed, and the effectiveness of the cladding powder formula, the rationality of laser cladding process parameters and laser shock strengthening process parameters are verified.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A laser composite repairing method for a pile leg of a marine platform capable of eliminating a cladding layer interface is characterized by comprising the following steps: the method specifically comprises the following steps of,
s1, extracting a defect model according to the shape, size and depth of the damaged part of the pile leg of the marine platform, and carrying out primary layered design on the pit;
s2, machining the damaged area, removing the damaged surface layer, and machining a repair area with a corresponding shape according to the damaged shape;
s3, preparing special cladding powder for repairing the damaged marine platform pile leg according to the chemical components of the marine platform pile leg substrate; the marine platform pile leg is made of 690 high-strength steel, and a pile leg matrix comprises the following chemical components in percentage by weight: 0.1 to 0.2 percent of carbon, 0.3 to 0.5 percent of silicon, 1.5 to 1.8 percent of manganese, 0.1 to 0.3 percent of phosphorus, 0.01 percent of sulfur, 1.5 to 2.2 percent of chromium, 3.5 to 4 percent of nickel, 0.6 to 0.8 percent of molybdenum, 0.08 percent of vanadium and the balance of iron; the cladding powder comprises the following chemical components in percentage by weight: 0.1 to 0.2 percent of carbon, 0.5 to 0.7 percent of silicon, 1.7 to 2 percent of manganese, 0.1 to 0.3 percent of phosphorus, 0.01 percent of sulfur, 0.1 to 0.2 percent of chromium, 3 to 4.5 percent of nickel, 0.3 to 0.5 percent of molybdenum, 0.05 percent of vanadium and the balance of iron;
s4, milling a circular truncated cone-shaped pit in the center of the defect according to the surface damage shape of the marine platform pile leg, performing laser cladding repair on the pit, forming a cladding layer on the marine platform pile leg substrate, and polishing the cladding layer smoothly; the laser cladding parameters are as follows: the laser pulse width is 15ns, the laser power is 1300W, the spot diameter is 2-4mm, the lap joint rate is 62.5%, the powder feeding rate is 0.4-0.6r/min, the scanning speed is 700 + 1000mm/min, and the laser scanning path is spiral from the circumference to the circle center;
s5, performing laser shock strengthening treatment on a cladding layer formed on the maritime work platform spud leg substrate by using laser-cladded cladding powder, eliminating an interface between the cladding layer and the spud leg substrate, and simultaneously checking the proportion of the selected cladding powder and the laser cladding technological parameters by using the eliminating effect of the interface between the cladding layer and the maritime work platform spud leg substrate after laser shock;
s6, detecting the grain characteristic change condition at the interface between the cladding layer and the marine platform pile leg substrate through an EBSD detection technology, and verifying the interface elimination effect between the cladding layer and the marine platform pile leg substrate; if the interface eliminating effect meets the repairing requirement, determining the proportion of cladding powder components and laser cladding process parameters; if the interface elimination effect does not meet the repair requirement, repeating the steps S3-S6, and adjusting the cladding powder component ratio in the step S3 and the laser cladding process parameters in the step S4;
s7, after verifying that the elimination effect of the cladding powder and the laser cladding technological parameters on the interface meets the repair requirement, performing layer-by-layer cladding repair on the pit of the spud leg substrate according to the determined cladding powder component proportion and the laser cladding technological parameters, and regulating and controlling the laser impact technological parameters, wherein once laser impact is performed on the cladding layer every time 2-3 cladding layers are clad until the cladding layer is higher than the surface of the spud leg of the maritime work platform; and polishing the surface of the cladding layer smoothly, and finally carrying out laser shock once, wherein the surface of the treated cladding layer is flush with the surface of the marine platform pile leg, so that the marine platform pile leg is repaired.
2. The laser composite repairing method for the marine platform pile leg capable of eliminating the interface of the cladding layer, according to claim 1, is characterized in that: the powder granularity of the cladding powder prepared in the step S3 is 45-105 μm, and the purity is 99.9%.
3. The laser composite repairing method for the marine platform pile leg capable of eliminating the interface of the cladding layer, according to claim 1, is characterized in that: in the step S4, in the laser cladding process, nitrogen protection and nitrogen powder feeding are adopted, the flow rate of protective gas is 6L/min, and the powder feeding pressure is 0.6 MPa.
4. The laser composite repairing method for the marine platform pile leg capable of eliminating the interface of the cladding layer, according to claim 1, is characterized in that: in the step S5, the thickness of the cladding layer subjected to the laser shock peening treatment is 2-3 mm.
5. The laser composite repairing method for the marine platform pile leg capable of eliminating the interface of the cladding layer, according to claim 1, is characterized in that: in step S5, the power density of the laser shock is 7.96GW/cm when performing the laser shock peening2Medium power density.
6. The laser composite repairing method for the marine platform pile leg capable of eliminating the interface of the cladding layer, according to claim 1, is characterized in that: in the step S6, during EBSD detection, the FEI Quanta 650 scanning electron microscope and the matched HKL NordlysNano EBSD probe are used to collect the data of the cross section of the cladding layer after laser impact in the step S5, and the variation of the grain characteristics of the interface region of the cross section of the cladding layer is observed to verify the effect of laser impact on eliminating the interface between the cladding layer and the leg substrate of the marine platform.
7. The laser composite repairing method for the marine platform pile leg capable of eliminating the interface of the cladding layer, according to claim 1, is characterized in that: in step S7, when adjusting the laser shock process parameters, the laser power density is selected to be 5.31-11.15GW/cm2Impacting 3 times under the same laser power density, wherein the diameter of a light spot is 2-5mm, and the lap joint rate is 25% -90%; during laser shock, an aluminum foil with a thickness of about 0.1mm was used as an absorbing layer and deionized water with a thickness of 2mm was used as a constraining layer.
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