CN114150244A - Combined strengthening method of laser temperature shot blasting and laser shot blasting - Google Patents

Combined strengthening method of laser temperature shot blasting and laser shot blasting Download PDF

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CN114150244A
CN114150244A CN202111471053.8A CN202111471053A CN114150244A CN 114150244 A CN114150244 A CN 114150244A CN 202111471053 A CN202111471053 A CN 202111471053A CN 114150244 A CN114150244 A CN 114150244A
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laser
shot blasting
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CN114150244B (en
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王恪典
唐章涵
耿永祥
董霞
段文强
梅雪松
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Xian Jiaotong University
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10—Inorganic compounds or compositions
    • C30B29/52—Alloys
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure

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Abstract

A combined strengthening method of laser temperature shot blasting and laser shot blasting comprises the steps of firstly carrying out linear cutting to obtain a nickel-based single crystal superalloy sample for strengthening treatment, then carrying out laser temperature shot blasting strengthening on the sample, then carrying out laser shot blasting strengthening on the sample after the laser temperature shot blasting strengthening, then carrying out surface hardness measurement on the sample after the laser shot blasting strengthening, then observing a microstructure on the surface of the sample after the laser shot blasting strengthening by using a transmission electron microscope, and finally optimizing parameters of the laser temperature shot blasting strengthening and the laser shot blasting strengthening to enable the hardness value of the sample after the strengthening to be larger and the dislocation density of the microstructure to be larger; the invention integrates the advantages of two strengthening technologies of laser temperature shot blasting and laser shot blasting, and the sample strengthening effect is good; the residual compressive stress is prevented from being thermally released at high temperature, a compact and stable residual compressive stress layer is obtained, and the method can be widely applied to aeroengine blades.

Description

Combined strengthening method of laser temperature shot blasting and laser shot blasting
Technical Field
The invention relates to the technical field of laser surface modification, in particular to a combined strengthening method of laser temperature shot blasting and laser shot blasting.
Background
The nickel-based single crystal superalloy has a special microstructure comprising a gamma matrix phase and a cubic gamma 'precipitate phase, wherein the gamma' precipitate phase is uniformly embedded in the gamma matrix; unlike polycrystalline materials, nickel-based single crystal superalloys have anisotropy, which makes them excellent mechanical properties.
As an efficient surface modification technology, Laser Shot Peening (LSP) utilizes Shock wave pressure induced by high-energy Laser to modify the surface of a material, so that the stress distribution and microstructure of the near-surface of the material can be effectively improved, the crack propagation speed is effectively delayed, and the fatigue life of a metal part is prolonged; in addition, the laser shot peening has the advantages of small thermal deformation, good geometric adaptability and the like, and is an effective means for solving the fatigue aging problem of the aircraft engine.
Laser Shot Peening (WLSP) is a new Laser Shock Peening technology, namely, a sample is heated to a dynamic strain aging temperature (0.2-0.5 Tm, Tm is a material melting point), and Laser shot Peening is performed on the sample at the temperature. The laser warm shot peening combines the advantages of laser shot peening and Dynamic Strain Aging (DSA), after the laser warm shot peening, dislocation expansion and high-density dislocation entanglement occur on the surface of a sample, a stable dislocation structure is formed, and the thermal stability of the material under a high-temperature condition is improved.
After the sample is subjected to laser warm shot peening, a dense dislocation network and a certain thermally stable residual compressive stress layer are generated on the near surface of the material, but the defect that the thermal stability of the residual compressive stress is poor exists.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a combined strengthening method of laser warm peening and laser peening, which prevents the residual compressive stress from heat release at high temperature, obtains a compact and stable residual compressive stress layer, has positive correlation between the thermal stability of the residual compressive stress and the surface hardness and dislocation density of the material, and characterizes the thermal stability of the residual compressive stress of the sample through the two indexes.
In order to achieve the purpose, the invention adopts the technical scheme that:
a combined strengthening method of laser temperature peening and laser peening comprises the following steps:
1) performing linear cutting to obtain a nickel-based single crystal superalloy sample for strengthening treatment;
2) performing laser temperature shot blasting reinforcement on the sample;
3) performing laser shot peening on the sample subjected to laser temperature shot peening;
4) measuring the surface hardness of the sample subjected to laser shot peening;
5) observing the microstructure of the sample surface after laser shot peening by using a transmission electron microscope;
6) the parameters of laser temperature shot peening and laser shot peening are optimized, so that the hardness value of a sample after the peening is larger, and the dislocation density of a microstructure is larger.
The model of the nickel-based single crystal superalloy sample in the step 1) is DD6, and the surface roughness is controlled to be below 0.4 μm.
The parameters of laser temperature shot peening strengthening in the step 2) are as follows: the temperature is 350-450 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the diameter of a light spot is 3mm, the lap joint rate is 30-50%, the impact frequency is 1-3 times, in the laser temperature shot blasting reinforcement, the absorption layer is aluminum foil, the restraint layer is quartz glass, the laser beam is fixed, the sample is fixed on a mechanical arm, the laser temperature shot blasting is carried out on different positions of the sample through the movement of the mechanical arm, the temperature range of the temperature shot blasting is 0.2-0.5 Tm, and the Tm is DD6 melting point.
The parameters of laser shot peening in the step 3) are as follows: the temperature is 20 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the diameter of a light spot is 3mm, the lap joint rate is 30-50%, and the impact frequency is 1-3 times; and cooling the sample to room temperature, and performing laser shot peening strengthening, wherein the absorption layer is an aluminum foil, the constraint layer is quartz glass, the laser beam is fixed, the sample is fixed on the mechanical arm, and the sample is moved by the mechanical arm to perform laser shot peening on different positions of the sample.
And 4) in the step 4), a digital micro Vickers hardness tester is adopted to measure the surface hardness, a load of 1.961N is applied to the shot blasting surface of the sample, the load is kept for 15 seconds, the micro hardness of each surface is measured five times and averaged, and finally, the hardness result is compared with the non-shot blasting sample and the laser shot blasting sample twice.
The microstructure observation of the sample surface in the step 5) adopts a field emission transmission electron microscope (JEOL JEM-F200(HR)), and the preparation steps of the sample are as follows: firstly, grinding and polishing the surface opposite to the shot blasting surface of the sample by using #500 to #2000 abrasive paper until the thickness of the sample is less than 30 mu m, and then perforating the sample by double-spraying electrolytic polishing in a solution of 10 vol% perchloric acid and 90 vol% ethanol at 20 ℃; and finally comparing the result with the sample which is not subjected to shot blasting and the sample subjected to laser shot blasting twice.
The invention has the following beneficial effects:
the invention integrates the advantages of two strengthening technologies of laser temperature shot blasting and laser shot blasting, and the sample strengthening effect is good; the nickel-based single crystal superalloy is widely applied to the blades of the aero-engine, and the blade has wide engineering application prospect of resisting fatigue by the method.
Drawings
FIG. 1 is a graph showing the hardness of example 1 of the present invention compared with that of an un-peened sample and a twice laser-peened sample.
FIG. 2 is a schematic comparison of transmission electron micrographs of example 1 of the invention and of a sample not subjected to laser peening twice.
Detailed Description
The present invention will be described in further detail with reference to the following examples and accompanying drawings.
Embodiment 1, a method for strengthening by combining laser warm peening and laser peening, comprising the steps of:
1) performing linear cutting to obtain a nickel-based single crystal superalloy sample for strengthening treatment;
the model of the nickel-based single crystal superalloy sample is DD6, the nickel-based single crystal superalloy is subjected to linear cutting, and is sequentially polished by abrasive paper from #200 to #1500, and the surface roughness of the sample is controlled to be below 0.4 mu m;
2) performing laser temperature shot blasting reinforcement on the sample;
the method comprises the following steps that nickel-based single crystal superalloy warm shot peening strengthening is carried out on a six-degree-of-freedom mechanical arm, a sample is fixed on a heating plate, after the sample is heated to the dynamic strain aging temperature of the sample by the heating plate, laser warm shot peening strengthening is carried out on different areas of the sample by a method of moving a laser beam to fix the sample by the mechanical arm, after the strengthening is completed, the sample is air-cooled to room temperature and taken out, wherein an absorption layer is aluminum foil, and a constraint layer is quartz glass; the temperature range of the warm shot blasting is 0.2-0.5TmWherein T ismDD6 melting point;
laser warm shot peening parameters: the parameters of laser temperature shot blasting strengthening are as follows: the temperature is 350 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 1 time;
3) performing laser shot peening on the sample subjected to laser temperature shot peening;
the method comprises the following steps that a nickel-based single crystal superalloy shot peening experiment is carried out on a six-degree-of-freedom mechanical arm, laser shot peening strengthening is carried out on different regions of a sample by a method that the mechanical arm moves a laser beam to be fixed, and the sample is taken out after strengthening is completed, wherein an absorption layer is an aluminum foil, and a constraint layer is quartz glass;
the laser shot peening parameters are as follows: the temperature is 20 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 1 time;
4) measuring the surface hardness of the sample subjected to laser shot peening;
the surface hardness measurement adopts a digital micro Vickers hardness tester (HX-1000TM/LCD), a load of 1.961N is applied to the shot blasting surface of the sample, the load is kept for 15 seconds, and the micro hardness of each surface is measured five times and averaged; finally, comparing the hardness results with the samples without shot blasting and the samples subjected to laser shot blasting twice, as shown in figure 1, the samples are ranked from high hardness to low hardness as follows: the laser temperature shot blasting and laser shot blasting are combined to strengthen the sample, the sample is shot-blasted twice, and the sample is not shot-blasted, which shows that the combined strengthening effect of the laser temperature shot blasting and the laser shot blasting is better;
5) observing the microstructure of the sample surface after laser shot peening by using a transmission electron microscope;
the microstructure of the sample surface is observed by a field emission transmission electron microscope (JEOL JEM-F200(HR)), and the sample is prepared by the following steps: first, the samples were polished by sandpaper (#500 to #2000) on the opposite side of the shot-blasted surface until the thickness of the samples was less than 30 μm, then the samples were punched by double shot electropolishing in a solution of 10 vol% perchloric acid and 90 vol% ethanol at 20 ℃, and finally the results were compared with the non-shot samples, the two laser shot-blasted samples, as shown in fig. 2, the samples were ranked from large to small in terms of dislocation density of the microstructure: the laser temperature shot blasting and laser shot blasting are combined to strengthen the sample, the sample is shot-blasted twice, and the sample is not shot-blasted, which shows that the combined strengthening effect of the laser temperature shot blasting and the laser shot blasting is better;
6) the parameters of laser temperature shot peening and laser shot peening are optimized, so that the hardness value of a sample after the peening is larger, and the dislocation density of a microstructure is larger.
Example 2, the parameters of laser temperature shot peening in step 2) of example 1 are changed as follows: the temperature is 400 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 1 time; the other steps are unchanged.
The surface hardness and the dislocation density of the microstructure of the sample surface are higher and larger than those of the combined strengthening sample in example 1.
Example 3, the parameters of laser temperature shot peening in step 2) of example 1 are changed as follows: the temperature is 450 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 1 time; the other steps are unchanged.
The surface hardness and the dislocation density of the microstructure of the sample surface are higher and larger than those of the combined reinforced samples in the embodiments 1 and 2.
In examples 1, 2 and 3, the combination of the increased hardness of the surface of the strengthened sample and the increased dislocation density in the microstructure was observed with the increased temperature of the hot peening, indicating that the increased temperature of the hot peening is one of the approaches for optimizing the experimental parameters.
Example 4, the parameters of laser temperature shot peening in step 2) of example 1 are changed to: the temperature is 350 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 40 percent, and the impact frequency is 1 time; the parameters of laser shot peening in the step 3) are changed into: the temperature is 20 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 40 percent, and the impact frequency is 1 time; the other steps are unchanged.
The surface hardness and the dislocation density of the microstructure of the sample surface of the combined strengthening sample of the embodiment are lower and smaller than those of the combined strengthening sample in the embodiment 1; in addition, the two laser shots of this example strengthen the surface hardness of the sample, and the dislocation density of the microstructure of the sample surface, lower and smaller than those of the two laser shots of example 1.
Example 5, the parameters of laser temperature shot peening in step 2) of example 1 are changed to: the temperature is 350 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 30 percent, and the impact frequency is 1 time; the parameters of laser shot peening in the step 3) are changed into: the temperature is 20 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 30 percent, and the impact frequency is 1 time; the other steps are unchanged.
The surface hardness and the dislocation density of the microstructure of the sample surface of the combined strengthening sample of the embodiment are lower and smaller than those of the combined strengthening samples of the embodiment 1 and the embodiment 4; in addition, the two laser peening samples of the present example are lower and smaller in surface hardness and dislocation density of microstructure on the surface of the sample than those of the two laser peening samples of examples 1 and 4.
In examples 1, 4 and 5, the surface hardness of the combined-strengthened sample and the two-time laser peening sample is reduced and the dislocation density in the microstructure is reduced along with the reduction of the overlap ratio of the warm shot peening, which indicates that the overlap ratio of the elevated temperature peening is one of the approaches for optimizing the experimental parameters.
Example 6, the parameters of laser temperature shot peening in step 2) of example 1 are changed to: the temperature is 350 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 2 times; the parameters of laser shot peening in the step 3) are changed into: the temperature is 20 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 2 times; the other steps are unchanged.
The surface hardness and the dislocation density of the microstructure of the sample surface of the combined reinforced sample of the embodiment are higher and larger than those of the combined reinforced sample of the embodiment 1; in addition, the two laser shots of this example strengthen the surface hardness of the sample, and the dislocation density of the microstructure of the sample surface, higher and larger than those of the two laser shots of example 1.
Example 7, the parameters of laser temperature shot peening in step 2) of example 1 are changed as follows: the temperature is 350 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 3 times; the parameters of laser shot peening in the step 3) are changed into: the temperature is 20 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 3 times; the other steps are unchanged.
The surface hardness and the dislocation density of the microstructure of the sample surface of the combined reinforced sample of the embodiment are higher and larger than those of the combined reinforced samples of the embodiment 1 and the embodiment 6; in addition, the two laser peening samples of the present example have higher and larger surface hardness and dislocation density of microstructure on the surface of the sample than those of the two laser peening samples of examples 1 and 6.
In examples 1, 6 and 7, the surface hardness of the combined-strengthened sample and the two-shot laser peening sample is increased and the dislocation density in the microstructure is increased along with the increase of the number of warm shot peening, which indicates that the number of elevated temperature shot peening is one of the approaches for optimizing experimental parameters.
By combining examples 1 to 7, the following were obtained: the experimental parameters can be optimized by increasing the shot blasting temperature of laser temperature shot blasting, increasing the lap joint rate of combined strengthening and increasing the impact times of combined strengthening.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A combined strengthening method of laser temperature shot blasting and laser shot blasting is characterized by comprising the following steps:
1) performing linear cutting to obtain a nickel-based single crystal superalloy sample for strengthening treatment;
2) performing laser temperature shot blasting reinforcement on the sample;
3) performing laser shot peening on the sample subjected to laser temperature shot peening;
4) measuring the surface hardness of the sample subjected to laser shot peening;
5) observing the microstructure of the sample surface after laser shot peening by using a transmission electron microscope;
6) the parameters of laser temperature shot peening and laser shot peening are optimized, so that the hardness value of a sample after the peening is larger, and the dislocation density of a microstructure is larger.
2. The method of claim 1, wherein: the model of the nickel-based single crystal superalloy sample in the step 1) is DD6, and the surface roughness is controlled to be below 0.4 μm.
3. The method of claim 1, wherein: the parameters of laser temperature shot peening strengthening in the step 2) are as follows: the temperature is 350-450 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the diameter of a light spot is 3mm, the lap joint rate is 30-50%, the impact frequency is 1-3 times, in the laser temperature shot blasting reinforcement, the absorption layer is aluminum foil, the restraint layer is quartz glass, the laser beam is fixed, the sample is fixed on a mechanical arm, the laser temperature shot blasting is carried out on different positions of the sample through the movement of the mechanical arm, the temperature range of the temperature shot blasting is 0.2-0.5 Tm, and the Tm is DD6 melting point.
4. The method of claim 1, wherein: the parameters of laser shot peening in the step 3) are as follows: the temperature is 20 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the diameter of a light spot is 3mm, the lap joint rate is 30-50%, and the impact frequency is 1-3 times; and cooling the sample to room temperature, and performing laser shot peening strengthening, wherein the absorption layer is an aluminum foil, the constraint layer is quartz glass, the laser beam is fixed, the sample is fixed on the mechanical arm, and the sample is moved by the mechanical arm to perform laser shot peening on different positions of the sample.
5. The method of claim 1, wherein: and 4) in the step 4), a digital micro Vickers hardness tester is adopted to measure the surface hardness, a load of 1.961N is applied to the shot blasting surface of the sample, the load is kept for 15 seconds, the micro hardness of each surface is measured five times and averaged, and finally, the hardness result is compared with the non-shot blasting sample and the laser shot blasting sample twice.
6. The method of claim 1, wherein: the microstructure observation of the sample surface in the step 5) adopts a field emission transmission electron microscope, and the preparation steps of the sample are as follows: firstly, grinding and polishing the surface opposite to the shot blasting surface of the sample by using #500 to #2000 abrasive paper until the thickness of the sample is less than 30 mu m, and then perforating the sample by double-spraying electrolytic polishing in a solution of 10 vol% perchloric acid and 90 vol% ethanol at 20 ℃; and finally comparing the result with the sample which is not subjected to shot blasting and the sample subjected to laser shot blasting twice.
7. A combined strengthening method of laser temperature shot blasting and laser shot blasting is characterized by comprising the following steps:
1) performing linear cutting to obtain a nickel-based single crystal superalloy sample for strengthening treatment;
the model of the nickel-based single crystal superalloy sample is DD6, the nickel-based single crystal superalloy is subjected to linear cutting, and is sequentially polished by abrasive paper from #200 to #1500, and the surface roughness of the sample is controlled to be below 0.4 mu m;
2) performing laser temperature shot blasting reinforcement on the sample;
the method comprises the following steps that nickel-based single crystal superalloy warm shot peening strengthening is carried out on a six-degree-of-freedom mechanical arm, a sample is fixed on a heating plate, after the sample is heated to the dynamic strain aging temperature of the sample by the heating plate, laser warm shot peening strengthening is carried out on different areas of the sample by a method of moving a laser beam to fix the sample by the mechanical arm, after the strengthening is completed, the sample is air-cooled to room temperature and taken out, wherein an absorption layer is aluminum foil, and a constraint layer is quartz glass; the temperature range of the warm shot blasting is 0.2-0.5TmWherein T ismDD6 melting point;
laser warm shot peening parameters: the parameters of laser temperature shot blasting strengthening are as follows: the temperature is 350 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 1 time;
3) performing laser shot peening on the sample subjected to laser temperature shot peening;
the method comprises the following steps that a nickel-based single crystal superalloy shot peening experiment is carried out on a six-degree-of-freedom mechanical arm, laser shot peening strengthening is carried out on different regions of a sample by a method that the mechanical arm moves a laser beam to be fixed, and the sample is taken out after strengthening is completed, wherein an absorption layer is an aluminum foil, and a constraint layer is quartz glass;
the laser shot peening parameters are as follows: the temperature is 20 ℃, the wavelength is 1064nm, the single pulse energy is 7J, the pulse width is 20ns, the frequency is 1Hz, the spot diameter is 3mm, the lap joint rate is 50 percent, and the impact frequency is 1 time;
4) measuring the surface hardness of the sample subjected to laser shot peening;
measuring the surface hardness by adopting a digital microscopic Vickers hardness tester, applying a load of 1.961N on a shot blasting surface of a sample, keeping the load for 15 seconds, measuring the microhardness of each surface five times and taking an average value; finally comparing hardness results with samples which are not subjected to shot blasting and samples subjected to laser shot blasting twice, wherein the samples are sorted from high hardness to low hardness: combining laser temperature shot blasting and laser shot blasting to strengthen the sample, twice laser shot blasting the sample and not shot blasting the sample;
5) observing the microstructure of the sample surface after laser shot peening by using a transmission electron microscope;
the microstructure observation of the sample surface adopts a field emission transmission electron microscope, and the preparation steps of the sample are as follows: firstly, grinding and polishing the surface opposite to the shot blasting surface of the sample by using #500 to #2000 sandpaper until the thickness of the sample is less than 30 mu m, then perforating the sample by double-blasting electrolytic polishing in a solution of 10 vol% perchloric acid and 90 vol% ethanol at 20 ℃, and finally comparing the results with an un-shot blasting sample and a double-laser shot blasting sample, wherein the samples are ranked from large to small according to the dislocation density of the microstructure: combining laser temperature shot blasting and laser shot blasting to strengthen the sample, twice laser shot blasting the sample and not shot blasting the sample;
6) the parameters of laser temperature shot peening and laser shot peening are optimized, so that the hardness value of a sample after the peening is larger, and the dislocation density of a microstructure is larger.
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季杏露等: "温度及功率密度对镍基合金Inconel 718激光温喷丸影响的数值模拟与实验研究", 《应用激光》 *
郑刚等: "激光温喷丸强化Inconel718镍基合金热腐蚀性能研究", 《中国激光》 *

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