CN114790507A - Steam turbine blade and method of strengthening the same - Google Patents
Steam turbine blade and method of strengthening the same Download PDFInfo
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- CN114790507A CN114790507A CN202110097671.4A CN202110097671A CN114790507A CN 114790507 A CN114790507 A CN 114790507A CN 202110097671 A CN202110097671 A CN 202110097671A CN 114790507 A CN114790507 A CN 114790507A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/286—Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/20091—Measuring the energy-dispersion spectrum [EDS] of diffracted radiation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/05—Investigating materials by wave or particle radiation by diffraction, scatter or reflection
- G01N2223/056—Investigating materials by wave or particle radiation by diffraction, scatter or reflection diffraction
- G01N2223/0563—Investigating materials by wave or particle radiation by diffraction, scatter or reflection diffraction measure of energy-dispersion spectrum of diffracted radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
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- G01N2223/63—Specific applications or type of materials turbine blades
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Abstract
The invention relates to the field of power generation equipment processing, and discloses a turbine blade and a strengthening method thereof, wherein the strengthening method comprises the following steps: detecting the element components of the turbine blade through an energy spectrometer; if the contents of a plurality of specified elements in the element components are within a preset content range, judging that the turbine blade is available, and performing surface pretreatment on a strengthening region of the turbine blade; carrying out laser quenching treatment on the reinforced area according to preset quenching conditions; and carrying out aging treatment on the turbine blade subjected to the laser quenching treatment in the strengthening region according to a preset aging condition. According to the invention, the surface strength of the reinforced area of the turbine blade is enhanced through the composition of martensite reinforcement and second-phase reinforcement.
Description
Technical Field
The invention relates to the field of power generation equipment processing, in particular to a steam turbine blade and a strengthening method thereof.
Background
The steam turbine blade is an important working part of a steam turbine, the air inlet end of the blade is positioned in a high-pressure working section and is corroded and washed by wet steam, and the tail end of the blade is subjected to the maximum periodic stress, so that water erosion fatigue wear and even breakage are easy to occur, and a steam turbine set is caused to generate strong vibration. Therefore, the turbine blade needs to be quenched and strengthened.
The existing turbine blade is quenched and strengthened by mainly adopting induction quenching and stellite alloy deposited on the tail end of the blade, the blade is enlarged in shape, secondary processing and shaping are needed, the processing efficiency is low, and the processing cost is high. Therefore, a new method for strengthening the turbine blade needs to be found, so that the strengthening of the turbine blade can be completed with lower processing cost and higher processing efficiency.
Disclosure of Invention
In view of the above, it is necessary to provide a steam turbine blade and a strengthening method thereof to improve the processing efficiency of the steam turbine blade and reduce the processing cost of the steam turbine blade.
A method of reinforcing a steam turbine blade, comprising:
detecting the element components of the turbine blade through an energy spectrometer;
if the contents of a plurality of specified elements in the element components are within a preset content range, judging that the steam turbine blade is available, and performing surface pretreatment on a strengthened area of the steam turbine blade;
carrying out laser quenching treatment on the reinforced area according to preset quenching conditions;
and carrying out aging treatment on the turbine blade subjected to the laser quenching treatment of the strengthening area according to preset aging conditions.
Optionally, after performing the aging treatment on the turbine blade that has been subjected to the laser quenching treatment in the strengthening region according to a preset aging condition, the method further includes:
detecting the strengthening effect of the strengthening area;
and if the strengthening effect meets the preset effect requirement, judging that the strengthening quality of the turbine blade is qualified.
Optionally, the specified elements include carbon, chromium, and copper;
wherein the preset content range of carbon is as follows: 0.053 wt% -0.07 wt%;
the preset content range of chromium is as follows: 6 wt% -17 wt%;
the preset content range of copper is as follows: 3.1 wt% -3.5 wt%.
Optionally, the surface pretreatment of the strengthened region of the turbine blade includes:
and polishing the reinforced area, and cleaning the reinforced area by using a solvent.
Optionally, if the content of a plurality of specified elements in the element composition is within a preset content range, the method further includes, before determining that the turbine blade is usable and performing surface pretreatment on the strengthened region of the turbine blade, the method further includes:
receiving an area setting instruction, and setting the reinforced area according to the area setting instruction, wherein the width of the reinforced area is 100-200 mm.
Optionally, the preset quenching conditions include:
the laser light spots for quenching treatment are rectangular light spots with energy uniformity greater than a preset uniformity threshold;
the quenching temperature range is 1050-1150 ℃;
the quenching speed is 3 mm/s-6 mm/s.
Optionally, the performing laser quenching treatment on the strengthened region according to a preset quenching condition includes:
acquiring the temperature of the strengthened area through a temperature detector;
and adjusting the output power of the laser according to the temperature so that the strengthening area is in a preset temperature control range.
Optionally, the preset aging condition includes:
the aging temperature is 470-500 ℃;
the heat preservation time is 1.8 h-2.1 h.
Optionally, the performing laser quenching treatment on the strengthened region according to a preset quenching condition includes:
and carrying out laser quenching treatment on the strengthened region through a laser, wherein the laser comprises a fiber laser or a fiber coupling output semiconductor laser, and the output power of the laser is 2000W-6000W.
A steam turbine blade is subjected to strengthening treatment by any one of the above steam turbine blade strengthening methods;
the turbine blade is made of 17-4PH martensite precipitation strengthened stainless steel;
the surface properties of the strengthened region of the turbine blade include:
the hardness is 480 HV-510 HV;
the quenching depth is 1.2 mm-1.5 mm;
the deformation is less than 30 microns.
According to the steam turbine blade and the strengthening method thereof, the element components of the steam turbine blade are detected through the energy spectrometer so as to determine whether the material of the steam turbine blade is suitable for strengthening or not. And if the contents of a plurality of specified elements in the element components are within a preset content range, judging that the turbine blade is available, and performing surface pretreatment on a strengthened area of the turbine blade to reduce reflection of laser and reduce interference of impurities. And carrying out laser quenching treatment on the reinforced area according to preset quenching conditions so as to realize martensite reinforcement on the reinforced area. And carrying out aging treatment on the steam turbine blade subjected to the laser quenching treatment in the strengthening region according to a preset aging condition so as to realize second-phase strengthening on the strengthening region. According to the invention, the surface strength of the turbine blade strengthening area is enhanced through the composition of martensite strengthening and second phase strengthening.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic flow diagram of a method for strengthening a turbine blade according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In one embodiment, as shown in FIG. 1, a method of strengthening a steam turbine blade is provided, comprising the steps of:
and S10, detecting the element components of the turbine blade through an energy spectrometer.
Understandably, an Energy Dispersive Spectrometer (EDS) is an instrument for analyzing the types and contents of constituent elements in a material domain. The elemental composition of the turbine blade can be detected by an energy spectrometer. In one example, the elemental composition (mass fraction) of a turbine blade includes:
C：0.053wt％～0.07wt％；
Mn：0.62wt％～0.8wt％；
Si：0.57wt％～0.65wt％；
Ni：4.5wt％～5wt％；
Cr：16wt％～17wt％；
Cu：3.1wt％～3.5wt％；
p: less than 0.02 wt%;
s: less than 0.02 wt%;
the balance being Fe.
And S20, if the content of a plurality of designated elements in the element components is within a preset content range, judging that the turbine blade is available, and performing surface pretreatment on the strengthened area of the turbine blade.
Understandably, the designated elements may be determined based on the strengthening characteristics of the material used for the turbine blade. In one example, the specified elements include carbon, chromium, and copper. Each of the designated elements corresponds to a predetermined content range.
The strengthening measures (quenching and aging treatment) of the steps S30 and S40 can enable the specified elements to form a specific lattice structure only when the content of a plurality of specified elements is within a preset content range, and the strengthening of the turbine blade is realized. And when the content of the plurality of specified elements is within the preset content range, judging that the turbine blade is available, and indicating that the turbine blade can be strengthened. And when the contents of the plurality of specified elements are not in the preset content range, judging that the turbine blade is unavailable, and indicating that the turbine blade cannot be strengthened.
After the turbine blade is determined to be usable, the reinforced area of the turbine blade can be subjected to surface pretreatment to ensure the quality of laser quenching. As used herein, a reinforced region may refer to an end of a turbine blade
In one example, the specified elements include carbon, chromium, and copper;
wherein the preset content range of carbon is as follows: 0.053 wt% -0.07 wt%;
the preset content range of chromium is as follows: 6 wt% -17 wt%;
the preset content range of copper is as follows: 3.1 wt% -3.5 wt%.
Understandably, carbon, chromium and copper in the strengthening area can precipitate copper-rich phase and chromium carbide which are dispersed and distributed in the aging treatment stage, so as to realize the second phase strengthening of the strengthening area. If each specified element is not in the corresponding preset content range, the precipitation of the copper-rich phase and the chromium carbide is not facilitated.
In one example, the step S20 of performing surface pretreatment on the strengthened region of the turbine blade includes:
s201, polishing the reinforced area, and cleaning the reinforced area by using a solvent.
Understandably, the strengthened region can be polished with metallographic sandpaper to reduce light reflection at the strengthened region. The enhanced region is then washed with a solvent, which may be an alcohol.
And S30, carrying out laser quenching treatment on the strengthened area according to preset quenching conditions.
Understandably, the preset quenching condition may be determined according to the material characteristics of the turbine blade. When the material of the turbine blade is 17-4PH martensite precipitation strengthening type stainless steel, the martensite can be further strengthened by laser quenching.
Optionally, the preset quenching conditions include:
the laser spots used for quenching treatment are rectangular spots with energy uniformity greater than a preset uniformity threshold;
the quenching temperature range is 1050-1150 ℃;
the quenching speed is 3 mm/s-6 mm/s.
Understandably, the laser generated by the laser is shaped and projected on the reinforced area to form a rectangular light spot. An oxygen-free copper integral lens can be used to reshape a circular spot of near-gaussian distribution into a rectangular spot with an energy uniformity greater than a preset uniformity threshold. The preset uniformity threshold can be set according to actual requirements. In one example, the predetermined uniformity threshold comprises 90% to 95% with a rectangular spot size of 4mmx20 mm. The rectangular light spots can ensure uniform quenching quality of the reinforced area.
The quenching temperature range can be set according to actual needs. In one example, the quenching temperature range includes 1050 ℃ to 1150 ℃.
The quenching speed may refer to a moving speed of a laser processing head (a light emitting portion of laser emitted by a laser after shaping).
Optionally, in step S30, the performing laser quenching treatment on the strengthened region according to a preset quenching condition includes:
s301, acquiring the temperature of the strengthened area through a temperature detector;
s302, adjusting the output power of the laser according to the temperature to enable the strengthening area to be in a preset temperature control range.
Understandably, the temperature detector can be a bicolor pyrometer. The temperature measuring range of the temperature measurer is 450-1500 ℃, and the measuring period is 0.1 ms. When laser quenching is carried out, a quenching temperature (the quenching temperature is within 1050-1150 ℃) can be set, and when the temperature of the strengthened area obtained by the temperature detector is lower than the quenching temperature, the output power of the laser can be improved, so that the temperature of the strengthened area is improved; when the temperature of the strengthened area obtained by the temperature detector is equal to the quenching temperature, the current output power of the laser can be maintained so as to keep the temperature of the strengthened area; when the temperature of the strengthened area obtained by the temperature detector is higher than the quenching temperature, the output power of the laser can be reduced, so that the temperature of the strengthened area is reduced. In one example, the preset temperature control range may be the quenching temperature ± 10 ℃. The quenching quality of the reinforced area can be ensured through rapid and accurate temperature control.
And S40, performing aging treatment on the turbine blade subjected to the laser quenching treatment of the strengthening area according to preset aging conditions.
Understandably, the preset aging conditions can be determined by actual tests. Under the preset aging condition, the strengthened area can generate dispersion strengthening, and the strength of the strengthened area is further improved.
In steps S10-S40, elemental compositions of the turbine blade are detected by an energy spectrometer to determine whether the material of the turbine blade is suitable for strengthening. And if the contents of a plurality of specified elements in the element components are within a preset content range, judging that the turbine blade is available, and performing surface pretreatment on a strengthened region of the turbine blade to reduce the reflection of laser and reduce the interference of impurities. And carrying out laser quenching treatment on the reinforced area according to preset quenching conditions so as to realize martensite reinforcement on the reinforced area. And carrying out aging treatment on the turbine blade subjected to the laser quenching treatment in the strengthening region according to a preset aging condition so as to realize second-phase strengthening on the strengthening region. According to the invention, the surface strength of the turbine blade strengthening area is enhanced through the composition of martensite strengthening and second phase strengthening.
In one example, the preset aging conditions include:
the aging temperature is 470-500 ℃;
the heat preservation time is 1.8 h-2.1 h.
Understandably, the material of the turbine blade may be 17-4PH martensitic precipitation strengthened stainless steel. The material can precipitate copper-rich phase and chromium carbide which are dispersed and distributed at 470-500 ℃ to form second phase strengthening. The aging treatment may be performed in a heat treatment furnace.
Preferably, the holding time is 1.8 h-2.1 h. The heat preservation time is too long, crystal grains grow up, and the hardness is reduced; the heat preservation time is too short, the copper-rich phase and the chromium carbide which are dispersed and distributed are not completely separated out, and the strengthening effect cannot be achieved.
Optionally, in step S40, after the aging treatment is performed on the turbine blade that has been subjected to the laser quenching treatment in the strengthened region according to the preset aging condition, the method further includes:
s50, detecting the strengthening effect of the strengthened area;
and S60, if the strengthening effect meets the preset effect requirement, judging that the strengthening quality of the turbine blade is qualified.
Understandably, in one example, the strengthening effect of the strengthened region includes:
the hardness is 480 HV-510 HV;
the quenching depth is 1.2 mm-1.5 mm;
the deformation is less than 30 microns.
The preset effect requirements can be set according to actual needs. In one example, the preset effect requirements include: the hardness is more than 450HV, the quenching depth is more than 1mm, and the deformation is less than 50 microns. And if the strengthening effect meets the preset effect requirement, judging that the strengthening quality of the turbine blade is qualified. And if the strengthening effect does not meet the preset effect requirement, judging that the strengthening quality of the turbine blade is unqualified.
Optionally, before step S20, that is, before the determining that the steam turbine blade is usable and performing surface pretreatment on the strengthened region of the steam turbine blade if the content of the specified elements in the element composition is within the preset content range, the method further includes:
s21, receiving an area setting instruction, and setting the reinforced area according to the area setting instruction, wherein the width of the reinforced area is 100-200 mm.
Understandably, the region setting instruction may be a manually input instruction. The strengthening area can be set according to the shape and the stress characteristics of the turbine blade. For example, a region where the intake end receives the largest impact force and a region that is susceptible to cavitation may be set as the strengthening region. The width of the strengthened region may be set to 100mm to 200 mm.
Optionally, in step S30, performing laser quenching on the strengthened region according to a preset quenching condition includes:
and S303, carrying out laser quenching treatment on the strengthened region through a laser, wherein the laser comprises a fiber laser or a fiber coupling output semiconductor laser, and the output power of the laser is 2000-6000W.
Understandably, the strengthened region may be laser quenched by a laser. The laser can be selected from a fiber laser or a fiber coupling output semiconductor laser. The laser light generated by the fiber laser or the fiber coupling output semiconductor laser is easily absorbed by the strengthened region. The output power of the laser is 2000W-6000W.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by functions and internal logic of the process, and should not limit the implementation process of the embodiments of the present invention in any way.
The turbine blade is subjected to strengthening treatment by any one of the above turbine blade strengthening methods;
the turbine blade is made of 17-4PH martensite precipitation strengthened stainless steel;
the surface properties of the strengthened region of the turbine blade include:
the hardness is 480 HV-510 HV;
the quenching depth is 1.2 mm-1.5 mm;
the deformation is less than 30 microns.
Understandably, 17-4PH martensitic precipitation strengthened stainless steel can be used as the material of the turbine blade. The 17-4PH martensite precipitation-strengthened stainless steel has good attenuation performance, corrosion resistance, fatigue resistance and water drop resistance.
After laser quenching and aging treatment, the surface properties (i.e., strengthening effect) of the turbine blade include: the hardness is 480 HV-510 HV; the quenching depth is 1.2 mm-1.5 mm; the deformation is less than 30 microns. Wherein, the hardness can be measured by a hardness meter; the quenching depth can be measured by a metallographic microscope; the amount of deformation can be detected by three coordinates. In addition, after the strengthening, the fatigue resistance of the strengthened area is improved by 0.8-1.2 times compared with that before the strengthening. The fatigue resistance of a turbine blade can be characterized using an SN curve (stress-life curve).
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method of strengthening a steam turbine blade, comprising:
detecting the element components of the turbine blade through an energy spectrometer;
if the contents of a plurality of specified elements in the element components are within a preset content range, judging that the turbine blade is available, and performing surface pretreatment on a strengthened region of the turbine blade;
carrying out laser quenching treatment on the reinforced area according to preset quenching conditions;
and carrying out aging treatment on the turbine blade subjected to the laser quenching treatment of the strengthening area according to preset aging conditions.
2. The turbine blade strengthening method according to claim 1, wherein after the aging treatment of the turbine blade having been subjected to the laser quenching treatment of the strengthened region according to the preset aging condition, the method further comprises:
detecting the strengthening effect of the strengthening area;
and if the strengthening effect meets the preset effect requirement, judging that the strengthening quality of the turbine blade is qualified.
3. The steam turbine blade strengthening method of claim 1, wherein the specified elements include carbon, chromium, and copper;
wherein the preset content range of carbon is as follows: 0.053 wt% -0.07 wt%;
the preset content range of chromium is as follows: 6 wt% -17 wt%;
the preset content range of copper is as follows: 3.1 wt% -3.5 wt%.
4. The steam turbine blade strengthening method of claim 1, wherein said surface pre-treating said strengthened region of said steam turbine blade comprises:
and polishing the reinforced area, and cleaning the reinforced area by using a solvent.
5. The method of strengthening a turbine blade according to claim 1, wherein said determining that said turbine blade is usable if the contents of a plurality of specified elements in said elemental composition are within a predetermined range of contents, and further comprising, before performing a surface pretreatment on a strengthened region of said turbine blade:
receiving an area setting instruction, and setting the reinforced area according to the area setting instruction, wherein the width of the reinforced area is 100-200 mm.
6. The steam turbine blade strengthening method of claim 1, wherein the predetermined quenching conditions comprise:
the laser light spots for quenching treatment are rectangular light spots with energy uniformity greater than a preset uniformity threshold;
the quenching temperature range is 1050-1150 ℃;
the quenching speed is 3 mm/s-6 mm/s.
7. The turbine blade strengthening method of claim 1, wherein the laser quenching treatment of the strengthened region according to a preset quenching condition comprises:
acquiring the temperature of the strengthened area through a temperature detector;
and adjusting the output power of the laser according to the temperature so that the strengthening area is in a preset temperature control range.
8. The method of strengthening a turbine blade according to claim 1, wherein the predetermined aging conditions comprise:
the aging temperature is 470-500 ℃;
the heat preservation time is 1.8 h-2.1 h.
9. The turbine blade strengthening method of claim 1, wherein the laser quenching treatment of the strengthened region according to a preset quenching condition comprises:
and carrying out laser quenching treatment on the strengthened region through a laser, wherein the laser comprises a fiber laser or a fiber coupling output semiconductor laser, and the output power of the laser is 2000W-6000W.
10. A steam turbine blade, characterized by being subjected to the strengthening treatment by the steam turbine blade strengthening method according to any one of claims 1 to 8;
the turbine blade is made of 17-4PH martensite precipitation strengthened stainless steel;
the surface properties of the strengthened region of the turbine blade include:
the hardness is 480 HV-510 HV;
the quenching depth is 1.2 mm-1.5 mm;
the deformation is less than 30 microns.
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|---|---|---|---|---|
| CN1740350A (en) * | 2005-09-16 | 2006-03-01 | 浙江工业大学 | The laser reinforcing process of the intake side of turbine vane |
| CN108977626A (en) * | 2018-08-22 | 2018-12-11 | 哈尔滨工程大学 | The laser quenching on steam turbine blade surface and ageing treatment composite strengthening method |
| CN111926151A (en) * | 2020-08-18 | 2020-11-13 | 哈尔滨汽轮机厂有限责任公司 | CFD (computational fluid dynamics) -assisted laser solid solution strengthening method for turbine blade |
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2021
- 2021-01-25 CN CN202110097671.4A patent/CN114790507A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1740350A (en) * | 2005-09-16 | 2006-03-01 | 浙江工业大学 | The laser reinforcing process of the intake side of turbine vane |
| CN108977626A (en) * | 2018-08-22 | 2018-12-11 | 哈尔滨工程大学 | The laser quenching on steam turbine blade surface and ageing treatment composite strengthening method |
| CN111926151A (en) * | 2020-08-18 | 2020-11-13 | 哈尔滨汽轮机厂有限责任公司 | CFD (computational fluid dynamics) -assisted laser solid solution strengthening method for turbine blade |
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| Title |
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| 杜锦铮 等: "17-4PH不锈钢透平叶片激光固溶时效强化的力学性能" * |
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