CN112692292A - Process method for repairing and strengthening 17-4PH part by laser - Google Patents
Process method for repairing and strengthening 17-4PH part by laser Download PDFInfo
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- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
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- 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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- 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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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
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- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
- B22F2007/068—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts repairing articles
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Abstract
The invention discloses a process method for repairing and strengthening a 17-4PH part by laser, which comprises the following steps: (1) removing defects and oil stains on the surface of a 17-4PH part (substrate); (2) repairing and strengthening by adopting (adjusted and optimized) composite laser melting deposition powder to obtain a repaired piece; (3) carrying out aging heat treatment on the repairing piece to further strengthen the performance of the coating; (4) and (6) finishing. The laser repair reinforced 17-4PH part obtained by the process method for laser repair reinforcing 17-4PH parts has high hardness and excellent wear performance, improves the service performance and prolongs the service life. Compared with the average hardness of 380HV of a 17-4PH homogeneous repair layer, the average hardness of a deposited repair layer using the powder can reach 435HV, and the wear performance is improved by about 20%.
Description
Technical Field
The invention relates to the technical field of 17-4PH laser repair reinforcement, in particular to a process method for repairing and reinforcing a 17-4PH part by laser.
Background
The 17-4PH alloy is precipitated, hardened and martensitic stainless steel consisting of copper, niobium/columbium. The characteristics are as follows: after heat treatment, the mechanical property of the product is more perfect, and the compressive strength of 1100-.
17-4PH is used for high pressure pump blade, it is the core component of the whole high pressure pump system, and is also one of the finest, most important part at the same time, its effect is to convert the kinetic energy of high temperature, high pressure, high speed steam flow into mechanical energy. The working conditions of the high-pressure pump blades are very harsh, and the high-pressure pump blades bear the combined action of high temperature, high pressure, centrifugal force, steam acting force, steam exciting force, corrosion, vibration and wet steam area water drop erosion for a long time along with the long-time uninterrupted running of a high-pressure pump unit, so that the high-pressure pump blades are inevitably worn, corroded, fatigued and other damage conditions, and even can cause the problems of blade fracture failure and the like in serious conditions, thereby causing the unit to stop, and seriously affecting the generating and working efficiency of the unit.
Therefore, how to effectively strengthen, repair and remanufacture the tissues of the last-stage blade and the next-stage blade of the damaged high-pressure pump becomes a key problem which needs to be solved urgently.
Based on the situation, the invention provides a process method for repairing and strengthening a 17-4PH part by laser, which can effectively solve the problems.
Disclosure of Invention
The invention aims to provide a process method for repairing and strengthening a 17-4PH part by laser. Aiming at the repair reinforcement of the 17-4PH part, the process method for repairing and reinforcing the 17-4PH part by laser selects novel laser melting deposition alloy powder (the composite laser melting deposition powder), repairs and reinforces the 17-4PH part by using the laser melting deposition process, further reinforces the mechanical properties of a deposition layer and a base material (the 17-4PH part) by subsequent heat treatment, strictly controls the process condition parameters of each step (the combination of the control of the process condition parameters and the selection of the novel laser melting deposition alloy powder (the composite laser melting deposition powder) is the key for obtaining the repaired and reinforced 17-4PH part with excellent performance, and only controls the process condition parameters in a proper range to be combined with the selection of the novel laser melting deposition alloy powder (the composite laser melting deposition powder), the quality of the repair-strengthened 17-4PH part can be guaranteed), and the laser repair-strengthened 17-4PH part is obtained.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a process method for repairing and strengthening a 17-4PH part by laser comprises the following steps:
(1) removing defects and oil stains on the surface of a 17-4PH part (substrate);
(2) repairing and strengthening by adopting (adjusted and optimized) composite laser melting deposition powder to obtain a repaired piece;
(3) carrying out aging heat treatment on the repairing piece to further strengthen the performance of the coating;
(4) and (6) finishing.
Preferably, in the step (1), the 17-4PH part is clamped on a lathe, and after the oil stain is cleaned by adopting a cleaning agent, the defects on the surface of the 17-4PH part are machined to expose fresh metal.
Preferably, in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then laser melting deposition repair is performed to obtain a repaired piece.
Preferably, in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then laser melting deposition repair is performed to obtain a repaired piece, wherein the used process parameters are as follows: the laser power is 1800-2000W, argon protection is adopted, the flow of protective gas argon is 15-25L/min, the laser scanning speed is 5-10 mm/s, the powder feeding speed is 6.2-12.5 g/min, and the lap joint rate between the lanes is 45-55%.
The quality of the laser melting deposition layer is influenced by the laser power, the scanning speed, the powder feeding amount and the lap joint rate, and the material is proved to have the power of 1800W-200W and excellent hardness and wear performance through a plurality of groups of experiments; the limited control of the scanning speed, the powder feeding speed and the lapping rate can effectively control the thickness of single-layer deposition, and avoid the excessive or insufficient participation of powder to cause the cracking of a deposition layer or the overhigh dilution rate on a base material.
Preferably, in the step (3), the aging heat treatment is performed on the repair part by using the following process parameters: temperature: 460 ℃ to 480 ℃, time: 2-4 h.
The advantages are that: because the base material with the pH of 17-4 can be subjected to performance strengthening on the base body through aging heat treatment, in order to ensure that the performance of a deposition layer is not reduced and further performance strengthening can be obtained when the deposition repairing layer and the base material are subjected to aging heat treatment simultaneously, the idea is realized by regulating and controlling the temperature and the time and finally using the experimental parameters.
Preferably, in the step (4), the repair part after the aging heat treatment is finished by using a lathe (so as to meet the use requirement).
Preferably, the 17-4PH part has the following chemical composition range in percentage by mass: c: 0.07 or less, Si: less than or equal to 1.0, Mn: less than or equal to 1.0, Cr: 1.55-1.75, Ni: 3.0-5.0, Cu: 3.0 to 5.0, Nb: 0.15-0.45, and the balance Fe.
Preferably, the composite laser melting deposition powder is formed by mixing matrix powder and TiC particles, wherein the TiC particles account for 2-2.3 wt% of the matrix powder; the base powder comprises the following chemical components in percentage by mass: c: 0.5 to 0.7, Si: less than or equal to 1.0, Mn: less than or equal to 1.0, Cr: 1.55-1.75, Ni: 3.0-5.0, Ti: 2.0 to 2.3, Cu: 3.0 to 5.0, Nb: 0.15-0.45, and the balance Fe.
The powder is added with the content of TiC particle phase in the 17-4PH original powder, so that the deposited layer obtains mechanical property superior to that of the base material, and the base material is repaired and strengthened.
The technological method for repairing and strengthening the 17-4PH part by the laser comprises the steps of firstly removing oil stains and defects on the surface of the 17-4PH part, then selecting novel laser melting deposition alloy powder (the composite laser melting deposition powder), repairing and strengthening the 17-4PH part by the laser melting deposition process, further strengthening the mechanical properties of a deposition layer and a base material (the 17-4PH part) by subsequent heat treatment, and finally restoring the repaired 17-4PH part to the designed size by a precision machining method.
The invention relates to a process method for laser repair reinforcement of 17-4PH parts, which is characterized in that at least two kinds of powder are mixed to prepare a novel composite laser melting deposition powder, wherein the composite laser melting deposition powder is formed by mixing matrix powder and TiC particles, and the TiC particles are 2-2.3 wt% of the matrix powder; the base powder comprises the following chemical components in percentage by mass: c: 0.5 to 0.7, Si: less than or equal to 1.0, Mn: less than or equal to 1.0, Cr: 1.55-1.75, Ni: 3.0-5.0, Ti: 2.0 to 2.3, Cu: 3.0 to 5.0, Nb: 0.15-0.45, and the balance Fe. ) So as to realize the repair strengthening of the 17-PH part and further obtain more excellent performance through heat treatment.
The technological method for laser repair strengthening of the 17-4PH part can further improve the performance of the deposition layer after heat treatment, on one hand, provides convenience for the technological sequence of heat treatment of the part, and on the other hand, can also effectively control the performance required by the deposition layer.
The technological method for repairing and strengthening the 17-4PH part by laser provides a solution for the repair and strengthening of the 17-4PH part and provides convenience for the heat treatment process sequence.
The invention also provides a 17-4PH part which is prepared by adopting the process method for repairing and strengthening the 17-4PH part by using the laser.
Compared with the prior art, the invention has the following advantages and beneficial effects:
aiming at the repair reinforcement of the 17-4PH part, the process method for repairing and reinforcing the 17-4PH part by laser selects novel laser melting deposition alloy powder (the composite laser melting deposition powder), repairs and reinforces the 17-4PH part by using the laser melting deposition process, further reinforces the mechanical properties of a deposition layer and a base material (the 17-4PH part) by subsequent heat treatment, strictly controls the process condition parameters of each step (the combination of the control of the process condition parameters and the selection of the novel laser melting deposition alloy powder (the composite laser melting deposition powder) is the key for obtaining the repaired and reinforced 17-4PH part with excellent performance, and only controls the process condition parameters in a proper range to be combined with the selection of the novel laser melting deposition alloy powder (the composite laser melting deposition powder), the quality of the repaired and strengthened 17-4PH part can be ensured), the laser repaired and strengthened 17-4PH part is obtained, the hardness is high, the abrasion performance is excellent, the service performance is improved, and the service life is prolonged. Compared with the average hardness of 380HV of a 17-4PH homogeneous repair layer, the average hardness of a deposited repair layer using the powder can reach 435HV, and the wear performance is improved by about 20%.
The invention relates to a process method for laser repair reinforcement of 17-4PH parts, which is characterized in that at least two kinds of powder are mixed to prepare a novel composite laser melting deposition powder, wherein the composite laser melting deposition powder is formed by mixing matrix powder and TiC particles, and the TiC particles are 2-2.3 wt% of the matrix powder; the base powder comprises the following chemical components in percentage by mass: c: 0.5 to 0.7, Si: less than or equal to 1.0, Mn: less than or equal to 1.0, Cr: 1.55-1.75, Ni: 3.0-5.0, Ti: 2.0 to 2.3, Cu: 3.0 to 5.0, Nb: 0.15-0.45, and the balance Fe. ) The proper formula of the composite laser melting deposition powder can effectively match the mechanical properties of 17-4PH parts, reasonably control the difference of the mechanical properties and well meet the use requirements of the 17-4PH parts.
According to the process method for repairing and strengthening the 17-4PH part by using the laser, the deposition layer after laser melting and deposition can be further strengthened by heat treatment, on one hand, convenience is provided for the process sequence of heat treatment of the part, and on the other hand, the performance required by the deposition layer can be effectively controlled.
The process method for repairing and strengthening the 17-4PH part by using the laser has the advantages of small process heat affected zone, low dilution rate and little influence on the mechanical property of the base material, and the settled layer can reach 5-10 mm.
Drawings
FIG. 1 is a graph comparing hardness curves of the deposition layers of the products obtained in example 4 of the present invention and comparative examples 1 to 3
FIG. 2 is a graph showing the volume difference between the grinding marks of the products of example 4 of the present invention and comparative examples 1 to 3
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
Example 1:
a process method for repairing and strengthening a 17-4PH part by laser comprises the following steps:
(1) removing defects and oil stains on the surface of a 17-4PH part (substrate);
(2) repairing and strengthening by adopting (adjusted and optimized) composite laser melting deposition powder to obtain a repaired piece;
(3) carrying out aging heat treatment on the repairing piece to further strengthen the performance of the coating;
(4) and (6) finishing.
Preferably, in the step (1), the 17-4PH part is clamped on a lathe, and after the oil stain is cleaned by adopting a cleaning agent, the defects on the surface of the 17-4PH part are machined to expose fresh metal.
Preferably, in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then laser melting deposition repair is performed to obtain a repaired piece.
Preferably, in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then laser melting deposition repair is performed to obtain a repaired piece, wherein the used process parameters are as follows: the laser power is 1800-2000W, argon protection is adopted, the flow of protective gas argon is 15-25L/min, the laser scanning speed is 5-10 mm/s, the powder feeding speed is 6.2-12.5 g/min, and the lap joint rate between the lanes is 45-55%.
Preferably, in the step (3), the aging heat treatment is performed on the repair part by using the following process parameters: temperature: 460 ℃ to 480 ℃, time: 2-4 h.
Preferably, in the step (4), the repair part after the aging heat treatment is finished by using a lathe (so as to meet the use requirement).
Preferably, the 17-4PH part has the following chemical composition range in percentage by mass: c: 0.07 or less, Si: less than or equal to 1.0, Mn: less than or equal to 1.0, Cr: 1.55-1.75, Ni: 3.0-5.0, Cu: 3.0 to 5.0, Nb: 0.15-0.45, and the balance Fe.
Preferably, the composite laser melting deposition powder is formed by mixing matrix powder and TiC particles, wherein the TiC particles account for 2-2.3 wt% of the matrix powder; the base powder comprises the following chemical components in percentage by mass: c: 0.5 to 0.7, Si: less than or equal to 1.0, Mn: less than or equal to 1.0, Cr: 1.55-1.75, Ni: 3.0-5.0, Ti: 2.0 to 2.3, Cu: 3.0 to 5.0, Nb: 0.15-0.45, and the balance Fe.
Example 2:
a process method for repairing and strengthening a 17-4PH part by laser comprises the following steps:
(1) removing defects and oil stains on the surface of a 17-4PH part (substrate);
(2) repairing and strengthening by adopting (adjusted and optimized) composite laser melting deposition powder to obtain a repaired piece;
(3) carrying out aging heat treatment on the repairing piece to further strengthen the performance of the coating;
(4) and (6) finishing.
In this embodiment, in step (1), a 17-4PH part is clamped on a lathe, and after oil stains are cleaned by using a cleaning agent, defects on the surface of the 17-4PH part are machined, so that fresh metal is exposed.
In this embodiment, in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then laser melting deposition repair is performed to obtain a repaired piece.
In this embodiment, in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then laser melting deposition repair is performed to obtain a repaired piece, where the used process parameters are as follows: the laser power is 1800W, argon protection is adopted, the flow of protective gas argon is 15L/min, the laser scanning speed is 5mm/s, the powder feeding speed is 6.2g/min, and the lap joint rate between the channels is 45%.
In this embodiment, in step (3), the process parameters used for performing the aging heat treatment on the repair part are as follows: temperature: 460 ℃, time: and 4 h.
In this embodiment, in the step (4), the repair after the aging heat treatment is finished by using a lathe (to meet the use requirement).
In this embodiment, the chemical composition of the 17-4PH part is as follows in mass%: c: 0.03, Si: 0.65, Mn: 0.73, Cr: 1.55, Ni: 3.0, Cu: 3.0, Nb: 0.15, and the balance Fe.
In this embodiment, the composite laser fusion deposition powder is formed by mixing matrix powder and TiC particles, wherein the TiC particles are 2 wt% of the matrix powder; the base powder comprises the following chemical components in percentage by mass: c: 0.5, Si: 0.54, Mn: 0.72, Cr: 1.55, Ni: 3.0, Ti: 2.0, Cu: 3.0, Nb: 0.15, and the balance Fe.
Example 3:
a process method for repairing and strengthening a 17-4PH part by laser comprises the following steps:
(1) removing defects and oil stains on the surface of a 17-4PH part (substrate);
(2) repairing and strengthening by adopting (adjusted and optimized) composite laser melting deposition powder to obtain a repaired piece;
(3) carrying out aging heat treatment on the repairing piece to further strengthen the performance of the coating;
(4) and (6) finishing.
In this embodiment, in step (1), a 17-4PH part is clamped on a lathe, and after oil stains are cleaned by using a cleaning agent, defects on the surface of the 17-4PH part are machined, so that fresh metal is exposed.
In this embodiment, in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then laser melting deposition repair is performed to obtain a repaired piece.
In this embodiment, in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then laser melting deposition repair is performed to obtain a repaired piece, where the used process parameters are as follows: the laser power is 2000W, argon protection is adopted, the flow of protective gas argon is 25L/min, the laser scanning speed is 10mm/s, the powder feeding speed is 12.5g/min, and the lap joint rate between the channels is 55%.
In this embodiment, in step (3), the process parameters used for performing the aging heat treatment on the repair part are as follows: temperature: 480 ℃, time: and 2 h.
In this embodiment, in the step (4), the repair after the aging heat treatment is finished by using a lathe (to meet the use requirement).
In this embodiment, the chemical composition of the 17-4PH part is as follows in mass%: c: 0.07, Si: 1.0, Mn: 1.0, Cr: 1.75, Ni: 5.0, Cu: 5.0, Nb: 0.45, and the balance Fe.
In this embodiment, the composite laser fusion deposition powder is formed by mixing matrix powder and TiC particles, wherein the TiC particles are 2.3 wt% of the matrix powder; the base powder comprises the following chemical components in percentage by mass: c: 0.7, Si: 1.0, Mn: 1.0, Cr: 1.75, Ni: 5.0, Ti: 2.8, Cu: 5.0, Nb: 0.45, and the balance Fe.
Example 4:
in this example, the chemical composition in mass% of the 17-4PH turbine blade had the following chemical composition ranges: c: 0.05, Si: 1.0, Mn: 0.8, Cr: 16.5, Ni: 3.6, Cu: 4.1, Nb: 0.25 and the balance Fe.
The repairing method comprises the following steps:
(1) removing defects and oil stains on the surface of a 17-4PH steam turbine blade;
(2) repairing and strengthening by adopting (adjusted and optimized) composite laser melting deposition powder;
(3) carrying out aging heat treatment on the repaired piece to further strengthen the performance of the coating;
(4) and (6) finishing.
In the step (1), the 17-4PH turbine blade is clamped on a lathe, and after oil stains are cleaned by adopting a cleaning agent, the surface defects of the 17-4PH turbine blade are machined to expose fresh metal;
in the step (2), adding the novel laser melting deposition dry powder into a laser powder feeder, and then carrying out laser melting deposition to repair the repaired piece; the used process parameters are as follows: the laser power is 2000W, argon protection is adopted, the flow of protective gas argon is 15L/min, the laser scanning speed is 10mm/s, the powder feeding speed is 12.5g/min, and the lap joint rate between the channels is 50%;
in the step (3), the coating and the repaired piece are repaired through aging heat treatment strengthening, and the used process parameters are as follows: temperature: 460 ℃, time: 2.5 h.
In the step (4), the aged repair part is subjected to finish machining by using a lathe so as to meet the use requirement.
The composite laser melting deposition powder is formed by mixing matrix powder and TiC particles, wherein the TiC particles account for 2.15 wt% of the matrix powder; the base powder comprises the following chemical components in percentage by mass: c: 0.7, Si: 1.0, Mn: 1.0, Cr: 1.65, Ni: 4.0, Ti: 2.3, Cu: 4.2, Nb: 0.45, and the balance Fe.
In the embodiment, the 17-4PH part is manufactured by the process method for laser repair strengthening of the 17-4PH part.
Embodiment 4 of the present invention is simply referred to as "TiC (heat) addition".
Comparative example 1:
the difference from the example 4 is that the composite laser melting deposition powder is replaced by 17-4PH alloy powder, and the aging heat treatment in the step (3) is not carried out, and the rest is the same as the example 4; abbreviated as "17-4 PH".
Comparative example 2:
the difference from the embodiment 4 is that the composite laser melting deposition powder is replaced by 17-4PH alloy powder, and the rest is the same as the embodiment 4; abbreviated as "17-4 PH (Heat)".
Comparative example 3:
the difference from example 4 is that there are no TiC particles and the aging heat treatment in step (3) is not performed, and the other is the same as example 4; abbreviated as "TiC addition".
The performance test was performed on the 'laser repair strengthened 17-4PH parts' obtained in example 4 of the present invention (examples 2 and 3 also have similar test results), comparative example 1 to comparative example 3, and the test results are shown in FIGS. 1 and 2.
As can be seen from fig. 1 and 2, the present invention has the following advantages:
compared with the hardness and wear resistance of a deposition layer repaired by using a 17-4PH homogeneous material in an experiment, the hardness and wear resistance of the deposition layer repaired by adopting the composite laser melting deposition powder (formed by mixing matrix powder and TiC particles), namely the hardness and wear resistance of the deposition layer which is prepared by regulating and controlling the TiC particles (the composite laser melting deposition powder) in the matrix powder after heat treatment are obviously superior to those of the deposition layer repaired by using the homogeneous powder.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (8)
1. A process method for repairing and strengthening a 17-4PH part by laser is characterized by comprising the following steps:
(1) removing defects and oil stains on the surface of a 17-4PH part;
(2) adopting composite laser melting deposition powder to carry out repair reinforcement to obtain a repaired piece;
(3) carrying out aging heat treatment on the repairing piece to further strengthen the performance of the coating;
(4) and (6) finishing.
2. The process method for repairing and strengthening the 17-4PH part by the laser according to claim 1, wherein in the step (1), the 17-4PH part is clamped on a lathe, and after oil stains are cleaned by a cleaning agent, defects on the surface of the 17-4PH part are lathed away to expose fresh metal.
3. The process method for repairing and strengthening a 17-4PH part by laser according to claim 1, wherein in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then the repairing is performed by laser melting deposition to obtain a repaired part.
4. The process method for repairing and strengthening a 17-4PH part by laser according to claim 1, wherein in the step (2), the dried composite laser melting deposition powder is added into a laser powder feeder, and then the repairing is performed by laser melting deposition, so as to obtain a repaired part, wherein the used process parameters are as follows: the laser power is 1800-2000W, argon protection is adopted, the flow of protective gas argon is 15-25L/min, the laser scanning speed is 5-10 mm/s, the powder feeding speed is 6.2-12.5 g/min, and the lap joint rate between the lanes is 45-55%.
5. The process method for laser repair strengthening of a 17-4PH part according to claim 1, wherein in the step (3), the aging heat treatment is performed on the repair part by using the following process parameters: temperature: 460 ℃ to 480 ℃, time: 2-4 h.
6. The process for laser repair strengthening of a 17-4PH part according to claim 1, wherein in the step (4), the finish machining is to finish machine the repaired part after aging heat treatment by using a lathe.
7. The process for laser repair strengthening of a 17-4PH component according to claim 1, wherein the chemical composition of the 17-4PH component is in mass%, and the chemical composition ranges are as follows: c: 0.07 or less, Si: less than or equal to 1.0, Mn: less than or equal to 1.0, Cr: 1.55-1.75, Ni: 3.0-5.0, Cu: 3.0 to 5.0, Nb: 0.15-0.45, and the balance Fe.
8. The process method for repairing and strengthening a 17-4PH part by laser according to claim 1, wherein the composite laser melting deposition powder is formed by mixing matrix powder and TiC particles, wherein the TiC particles are 2-2.3 wt% of the matrix powder; the base powder comprises the following chemical components in percentage by mass: c: 0.5 to 0.7, Si: less than or equal to 1.0, Mn: less than or equal to 1.0, Cr: 1.55-1.75, Ni: 3.0-5.0, Ti: 2.0 to 2.3, Cu: 3.0 to 5.0, Nb: 0.15-0.45, and the balance Fe.
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