CN108085479A - A kind of temperature-controlled laser shock peening high temperature stability maintenance method and apparatus - Google Patents
A kind of temperature-controlled laser shock peening high temperature stability maintenance method and apparatus Download PDFInfo
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- CN108085479A CN108085479A CN201611032046.7A CN201611032046A CN108085479A CN 108085479 A CN108085479 A CN 108085479A CN 201611032046 A CN201611032046 A CN 201611032046A CN 108085479 A CN108085479 A CN 108085479A
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- Prior art keywords
- temperature
- protective cover
- laser
- high temperature
- shock peening
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Classifications
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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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
Abstract
The present invention relates to a kind of temperature-controlled laser shock peening high temperature stability maintenance method and apparatus, device includes protective cover and heating rod, fixture, thermocouple and oxygen sensor in protective cover, the argon bottle being connected with protective cover；Heating rod is fixed on fixture, heating rod is equipped with sample；Laser is incident to specimen surface through the incident mirror on protective cover；Heating rod is also connected with thermocouple, for detection temperature；Protective cover is connected by air intake with argon bottle.Method includes being passed through argon gas into protective cover, and electrical bar is begun to warm up；It is remained unchanged by thermocouple measured temperature and reaches setting time, and when the oxygen concentration that measures of oxygen sensor is reduced to threshold value, start to strengthen；Laser impact intensified technological parameter is adjusted, is moved by robotic gripper sample, completes to strengthen.The present invention can effectively improve laser impact intensified high-temperature stability, inhibit the residual compressive stress layer high temperature failure of laser impact intensified induced synthesis, be a kind of effective laser-impact high temperature stability maintenance method.
Description
Technical field
The present invention proposes that temperature-controlled laser impact is strong for laser impact intensified induction residual compressive stress high temperature failure temperature
Change, effectively raise material surface residual compressive stress floor height temperature stability.
Background technology
Reiforcing laser impact technology has been successfully applied to the finishing process of aero-engine cold end blade at present,
The service life of engine at cold end is made to improve 3 times or more, effectively increases the ability of the anti-foreign object damage in its surface.But it studies
It was found that the residual compressive stress formed after laser impact intensified is kept the temperature under the conditions of high temperature (200 DEG C or more), residual stress can be caused
Part discharges, if soaking time is longer or temperature is higher, residual stress almost all disappears.It means that laser-impact is strong
The blade that change technology is difficult to apply to aero-engine hot junction is lengthened the life.It is actually asked for what aero-engine hot junction blade was lengthened the life
Topic, it is proposed that carry out at high temperature it is laser impact intensified, by improve temperature reduce material flow stress, make it in laser
Deeper residual stress layer is formed in impact process, it is effective to inhibit to strengthen effect high temperature unstability, effectively raise material table
Face residual compressive stress floor height temperature stability.
The content of the invention
The object of the present invention is to provide a kind of temperature-controlled laser shock peening high temperature stability maintenance device and methods, inhibit laser-impact
Strengthen the residual stress layer high temperature failure of induction, effectively improve its high-temperature stability.This method operates relatively easy, no dirt
Dye, high temperature stability maintenance significant effect.
Present invention technical solution used for the above purpose is：A kind of temperature-controlled laser shock peening high temperature stability maintenance dress
It puts, including heating rod, fixture, thermocouple and the oxygen sensor in protective cover and protective cover, the argon gas being connected with protective cover
Bottle；
Fixture is connected with robot；Heating rod is fixed on fixture, heating rod is equipped with sample；Laser is through on protective cover
Incident mirror is incident to specimen surface；Heating rod is also connected with thermocouple, for detection temperature；Protective cover passes through air intake and argon bottle
Connection.
The specimen surface is equipped with sacrificial layer, restraint layer successively.
The laser is incident to the restraint layer of specimen surface through the incident mirror on protective cover.
The sacrificial layer is glass.
The restraint layer is platinum.
A kind of temperature-controlled laser shock peening high temperature stability maintenance method, comprises the following steps：
(1) sample pretreatment；
(2) high-temperature laser impact prepares：Argon gas is passed through into protective cover, electrical bar is begun to warm up；It is surveyed by thermocouple
Temperature, which remains unchanged, reaches setting time, and when the oxygen concentration that measures of oxygen sensor is reduced to threshold value, starts to strengthen；
(3) it is laser impact intensified：Laser impact intensified technological parameter is adjusted, is moved by robotic gripper sample, is completed
Strengthen；
(4) sample post-processes：Surface restraint layer, sacrificial layer are removed, and with alcohol washes and dried up, for use.
The laser impact intensified technological parameter includes：Optical maser wavelength is 1064nm, pulse width 5-20ns, laser energy
0.5-10J, repetition rate 0.5-2Hz are measured, between the spot diameter of formation is about 0.5-3mm.
The invention has the advantages that and advantage：
1. the present invention can effectively improve laser impact intensified high-temperature stability, inhibit laser impact intensified induced synthesis
Residual compressive stress layer high temperature failure is a kind of effective laser-impact high temperature stability maintenance method.
2. the present invention prevents sample due to high-temperature oxydation using oxygen content and heating temperature in energy in real time monitoring and protecting cover
It influences material at high temperature and strengthens effect.
3. by the high-temperature laser impact reinforcing method to aero-engine common used material titanium alloy and high temperature resistant stainless steel
Laser impact intensified high temperature stability performance be significantly improved.
Description of the drawings
Fig. 1 the structural representation of present invention；
Fig. 2 flow charts of the method for the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
As Figure 1-Figure 2, the invention discloses a kind of temperature-controlled laser shock peening high temperature stability maintenance device and method, the temperature
Laser impact intensified high temperature stability maintenance device is controlled to include：Laser light incident window mirror, protective cover, protector air intake and gas outlet, add
The gas-guide tube of hot pin and fixture, thermocouple, heat insulation layer, ring flange, magnetic oxygen sensor etc., air intake and gas outlet and
Protective cover is threadedly secured to flange plate edge, and completely cuts off air with silicagel pad, by the use of argon gas as protective gas.Heating rod
Sample fixture is inserted into, freely can take out and adjust position, ring flange link mechanical arm realizes six-axis linkage.
Temperature-controlled laser shock peening process：Using the polishing of test button surface mechanical attrition, (surface roughness is not more than
0.2Ra), the alcohol for being then placed in concentration more than 75% is cleaned by ultrasonic drying；Then one layer of aluminum foil and adhesive tape is covered in burnishing surface to make
It for absorbed layer, and is fixed on special high-temperature laser impact fixture, and applies one layer of restraint layer (high temperature resistant light transmission on its surface
Glass) to hinder shock wave to external diffusion, enhance the effect of laser plasma shock wave；Sample be loaded it is upper after, will protect
Shield is fixed on ring flange, connects the gas-guide tube of air intake and gas outlet, is screwed in order to avoid gas leakage, then passes to argon gas.Simultaneously
Heating unit is opened, the electrical bar in fixture is begun to warm up, and heating temperature range is adjustable for 20-300 DEG C, treats temperature stabilization 1mim
Afterwards, after the oxygen concentration that oxygen sensor measures is reduced to 5vol%, opens laser and strengthen.Laser carries out intensive treatment use
Process parameters range it is as follows：Wavelength is 1064nm, pulse width 5-20ns, and laser energy exists in 0.5-10J, repetition rate
0.5-2Hz, between the spot diameter of formation is about 0.5-3mm, hot spot overlapping rate is 50% or so.By Surface absorption layer after processing
Remove, and dried up for use with alcohol washes.Finally, carry out that room temperature is laser impact intensified tests as a comparison under similarity condition.
Temperature-controlled laser shock peening high temperature stability maintenance device includes：Laser light incident window mirror, protective cover, protector air intake and
Gas outlet, heating rod and fixture, thermocouple, heat insulation layer, ring flange, magnetic oxygen sensor etc., air intake and gas outlet
Gas-guide tube and protective cover are threadedly secured to flange plate edge, and completely cut off air with silicagel pad, by the use of argon gas as protecting
Gas.Heating rod is inserted into sample fixture, freely can take out and adjust position, and ring flange link mechanical arm realizes six-axis linkage.
High temperature impact strengthens temp.-controlled electric heating rod：
High temperature is made of four groups of electrical bars, and temperature-control range is 25 DEG C -300 DEG C, and temperature accuracy is 0.1 DEG C, and heating rate is
It 100 DEG C/min, is accurately positioned using temperature control looped system control temperature, using thermocouple measuring temperature, and will test temperature
Degree feeds back to temperature-control adjustment device, realizes that temperature is adjusted in real time.
Strengthening process is as follows：
(1) High-Temperature Strengthening sample pretreatment：Surface mechanical attrition polishing (surface roughness is less than 0.2Ra), is then placed in
The alcohol of concentration more than 75% is cleaned by ultrasonic drying.Then one layer of aluminum foil and adhesive tape is covered as absorbed layer in burnishing surface, and fix
Apply one layer of restraint layer on special high-temperature laser impact fixture, and on its surface to hinder shock wave to external diffusion, enhancing
The effect of laser plasma shock wave.
(2) high-temperature laser impact prepares：Sample be loaded it is upper after, protective cover is fixed on ring flange, connect air intake and
The gas-guide tube of gas outlet is screwed in order to avoid gas leakage, then passes to argon gas.Fixture electrical bar is begun to warm up, heating temperature range 25-
300 DEG C adjustable, and after temperature stabilization 1min to be measured, the oxygen concentration that oxygen sensor measures is reduced to below 5VOL%, starts strong
Change.
(3) it is laser impact intensified：Laser impact intensified technological parameter is adjusted, laser parameter scope is as follows：Wavelength is
1064nm, pulse width 5-20ns, laser energy is in 0.5-10J, repetition rate in 0.5-2Hz, and the spot diameter of formation is about
Between 0.5-3mm.Using track robotic gripper sample, the path implementation of process is completed, is taken in the hot spot of X, Y-direction
The rate of connecing reaches 50% or so.
(4) High-Temperature Strengthening sample post-processes：Surface restraint layer, absorbed layer are removed after processing, and with alcohol washes and blown
It is dry, for use.Finally, carry out that room temperature is laser impact intensified tests as a comparison under similarity condition.
The material and thickness of absorbed layer：
The absorbed layer of specimen surface covering is aluminium foil, and the aluminium foil that thickness range is 20 μm -30 μm is as absorbed layer, induction
Plasma generation with laser shock wave, aluminium foil is excessively thin easily to occur ablation or breakage in impact process, influences specimen surface matter
Amount；Aluminium foil is blocked up, can laser energy can decay, plasma stock wave pressure reduce, influence laser impact intensified effect,
And require bubble-free and impurity between aluminium foil and sample.
Restraint layer requirement：
Restraint layer is high temperature resistant transparent glass before high-temperature laser impact, and 350 DEG C of △ T=200 DEG C, heat resisting temperature ＜ are safe
Operating temperature is 300 DEG C, and thickness is less than 2mm, has good translucency, allows to have few full-size less than 0.5mm's
Scattered vesicle, is less than 2 on 1dm2 areas, it is desirable that for Mohs' hardness between 7~10, glass guarantee has enough rigidity.
High temperature impact strengthens temperature-rise period：
It after sample is fixed on temperature control fixture, adjusts the temperature to and treats testing temperature, start to warm up, surveyed using infrared survey instrument
The temperature of specimen surface is measured, 10 different points are uniformly taken in specimen surface, and measures its temperature, until temperature reaches to be measured
Temperature (allows ± 1 DEG C of fluctuation), keeps the temperature 1min, then takes 5 different point test temperatures, it is ensured that and constant temperature is treating testing temperature,
Start laser impact intensified processing.
Embodiment 1
The present invention for TiAl alloy carry out temperature-controlled laser shock peening high temperature stability maintenance more excellent condition be：
By TiAl alloy plate wire cutting that thickness is 1.8mm into the sample less than 35mm × 50mm, with gasoline by its table
Face remnants oil stains remove, then single-sided polishing, and after surface roughness reaches Ra=0.2, ultrasound is clear in concentration is 75% alcohol
It is dried after washing 10min；
Aluminium foil that a layer thickness scope is 25 μm is pasted as absorbed layer in sample to be tested polished surface, induced laser generation
Plasma stock wave, and require bubble-free and impurity between aluminium foil and sample；
On the outside of aluminium foil, the optical glass of 1.5mm thickness is fixed with metal clip, safe working temperature is 300 DEG C, will be entire
Device is fixed on the fixture of high temperature impact reinforcing；
The temperature that high temperature impact is strengthened to fixture is adjusted to 200 DEG C, and range of temperature is no more than ± 1 after stablizing 1min
℃。
It is as follows to adjust laser impact intensified technological parameter：Wavelength is 1064nm, and pulse width is adjustable for 14ns, laser energy
7J is adjustable, repetition rate is adjustable in 2Hz, the spot diameter of formation is adjustable between being about 2mm.It is tried using track robotic gripper
Sample completes the path implementation of process, and working (finishing) area is the square of 20mm × 20mm, in X, the hot spot overlapping rate of Y-direction
Reach 45% or so, impact twice.
By in order to compare the effect of temperature-controlled laser shock peening high temperature stability maintenance, present invention is alternatively directed to the samples of same treatment
Laser impact intensified at normal temperatures, technological parameter is identical, and with being compared.Sample after reinforcing it is carried out microhardness and
The test of residual stress, test result are as shown in the table：
Table one
The TiAl alloy microhardness of high temperature impact is improved compared with room temperature impact there is no more apparent, residual stress test
As a result average value slightly improves but residual stress test result fluctuating range is larger.
Sample after strengthening to high temperature impact carries out air cooling after high-temperature aging, and high-temperature aging is divided into following 6 groups：
Table two
| Group | Temperature/DEG C | Time/h |
| 1 | 200 | 2 |
| 2 | 300 | 2 |
| 3 | 400 | 2 |
| 4 | 200 | 6 |
| 5 | 300 | 6 |
| 6 | 400 | 6 |
Above-mentioned six groups of aging effects are carried out with the test of microhardness and residual stress, test result such as table~shown：
The test result of microhardness：
Table three
The test result of residual stress：
Table four
For high-temperature aging after TiAl alloy implementation high-temperature laser impact shock peening, and the effect strengthened with room temperature carries out
Comparison.It was found that room temperature impact and the microhardness of high temperature impact and the numerical value of residual stress are almost without difference, explanation before timeliness
Temperature does not act on laser impact intensified rear effect significantly.The residual stress for the microhardness that room temperature impacts after overaging
There is significantly apparent attenuation；And sample carries out timeliness after high temperature impact, microhardness and residual stress attenuation degree are substantially low
It being impacted in room temperature, this several explanation, high temperature impact is strengthened to be significantly improved to preserving material surface mechanical property and residual stress,
Make material that there is more obvious stability under the high temperature conditions.
Claims (7)
1. a kind of temperature-controlled laser shock peening high temperature stability maintenance device, it is characterised in that including the heating in protective cover and protective cover
Stick, fixture, thermocouple and oxygen sensor, the argon bottle being connected with protective cover；
Fixture is connected with robot；Heating rod is fixed on fixture, heating rod is equipped with sample；Laser is through the incidence on protective cover
Mirror is incident to specimen surface；Heating rod is also connected with thermocouple, for detection temperature；Protective cover is connected by air intake and argon bottle
It connects.
A kind of 2. temperature-controlled laser shock peening high temperature stability maintenance method and apparatus according to claim 1, it is characterised in that institute
It states specimen surface and is equipped with sacrificial layer, restraint layer successively.
A kind of 3. temperature-controlled laser shock peening high temperature stability maintenance method and apparatus according to claim 1, it is characterised in that institute
State the restraint layer that laser is incident to specimen surface through the incident mirror on protective cover.
A kind of 4. temperature-controlled laser shock peening high temperature stability maintenance method and apparatus according to claim 2, it is characterised in that institute
Sacrificial layer is stated as glass.
5. a kind of temperature-controlled laser shock peening high temperature stability maintenance method and apparatus according to Claims 2 or 3, it is characterised in that
The restraint layer is platinum.
A kind of 6. temperature-controlled laser shock peening high temperature stability maintenance method, it is characterised in that comprise the following steps：
(1) sample pretreatment；
(2) high-temperature laser impact prepares：Argon gas is passed through into protective cover, electrical bar is begun to warm up；Pass through thermocouple measured temperature
It remains unchanged and reaches setting time, and when the oxygen concentration that measures of oxygen sensor is reduced to threshold value, start to strengthen；
(3) it is laser impact intensified：Laser impact intensified technological parameter is adjusted, is moved by robotic gripper sample, completes to strengthen；
(4) sample post-processes：Surface restraint layer, sacrificial layer are removed, and with alcohol washes and dried up, for use.
A kind of 7. temperature-controlled laser shock peening high temperature stability maintenance method according to claim 6, it is characterised in that the laser
Shock peening technological parameter includes：Optical maser wavelength is 1064nm, and pulse width 5-20ns repeats frequency laser energy 0.5-10J,
Rate 0.5-2Hz, the spot diameter of formation is about 0.5-3mm.
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| CN109136529A (en) * | 2018-10-25 | 2019-01-04 | 广东工业大学 | A kind of laser shock peening method |
| CN110196275A (en) * | 2019-05-15 | 2019-09-03 | 中国科学院上海硅酸盐研究所 | It is a kind of for the high temperature real-time sample pond of laser ablation system and its detection method |
| CN110578047A (en) * | 2018-06-07 | 2019-12-17 | 中国科学院沈阳自动化研究所 | high-temperature laser shock strengthening device and method |
| CN112359202A (en) * | 2020-11-02 | 2021-02-12 | 中国科学院沈阳自动化研究所 | Temperature-controlled laser shock peening device and temperature control method |
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| CN112359202A (en) * | 2020-11-02 | 2021-02-12 | 中国科学院沈阳自动化研究所 | Temperature-controlled laser shock peening device and temperature control method |
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