CN103834769B - Laser shock peening method under heating condition and thermostatted - Google Patents
Laser shock peening method under heating condition and thermostatted Download PDFInfo
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- CN103834769B CN103834769B CN201210492107.3A CN201210492107A CN103834769B CN 103834769 B CN103834769 B CN 103834769B CN 201210492107 A CN201210492107 A CN 201210492107A CN 103834769 B CN103834769 B CN 103834769B
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- thermostatted
- temperature sensor
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Abstract
The present invention relates to the laser shock peening method under a kind of heating condition and thermostatted, it is characterized in that: the surface adopting washes of absolute alcohol work metal workpiece; Heating of metal workpiece, is placed on metal works on thermostatted, to be placed on by restraint layer silica glass on metal works and to compress; Thermostatted, metal works and restraint layer entirety are installed in and become overall, adopt the tangent overlapping mode of hot spot to carry out laser impact intensified process to it.The conventional laser shock peening process of the present invention and same laser parameter has been carried out unrelieved stress, fatigue property, the thermostability of unrelieved stress and stability of period and has been contrasted: the finer and closely woven and residual stress level of crystal grain improves; Improve the stability of dislocation when thermal annealing and when cyclic loading loads.
Description
Technical field
The present invention relates to metal surface properties modification field, be specifically related to the laser shock peening method under a kind of heating condition and thermostatted.
Background technology
Reiforcing laser impact technology (LSP) utilizes high power density (10
9w/cm
2), short pulse (ns level) laser irradiation metal material surface, produce plasma stock wave and internally propagate, viscous deformation is produced at material surface, form intensive, stable dislocation structure and crystal grain thinning (" build up " mechanism) simultaneously, and residual very large residual compressive stress (" stress reinforced " mechanism).This technology can improve the mechanical property of material effectively, especially can improve antifatigue and the anti-stress corrosion performance of material significantly.
In conventional laser shock peening technology, in strengthening process, metallic substance severe plastic deformation can produce large residual compressive stress and surperficial crystal grain thinning tissue.In the loading procedure of cyclic loading, the residual compressive stress that laser impact intensified process produces is also unstable, particularly in the environment that temperature is higher, the residual compressive stress produced after process and surface nano-structure are at high temperature released completely, can find out from this, the fatigue lifetime of improving material by laser impact intensified process is very limited.Therefore, the stability improving the micro-assembly robot of laser impact intensified generation and residual compressive stress is extremely important.
Summary of the invention
The technical problem solved
In order to avoid the deficiencies in the prior art part, the present invention proposes laser shock peening method under a kind of heating condition and thermostatted, solves the stability problem of existing laser impact intensified micro-assembly robot and residual compressive stress.
Technical scheme
A laser shock peening method under heating condition, is characterized in that step is as follows:
Step 1: the surface adopting washes of absolute alcohol work metal workpiece;
Step 2: heating of metal workpiece to 280 ~ 300 ° C;
Step 3: the temperature of thermostatted is adjusted to 280 ~ 300 ° of C, is placed on by metal works on thermostatted, to be placed on restraint layer silica glass on metal works 7 and to compress;
Step 4: paste the thick transparent plastic film of 0.1mm at Quartz glass surfaces;
Step 5: thermostatted, metal works and restraint layer entirety are installed in and become overall, adopts the tangent overlapping mode of hot spot to carry out laser impact intensified process to it;
Step 6: change new restraint layer, adopts semicircle overlap joint to proceed laser impact intensified process, until hot spot covers whole region to be fortified.
Realize a thermostatted for the laser shock peening method under described heating condition, it is characterized in that comprising heat-conducting plate 1, multiple temperature sensor 2, multiple electricradiator 3 and multiple temperature regulator 4; In the aspect of the working face distance 2mm with heat-conducting plate 1, center is provided with a temperature sensor, and surrounding is uniformly distributed and is provided with multiple temperature sensor; Apart from the aspect of this aspect 4mm, the position of each temperature sensor is provided with; Each temperature sensor and electricradiator are electrically connected with respective temperature regulator; Described temperature sensor 2, electricradiator 3 are equal with temperature regulator 4 number.
Described heat-conducting plate 1 adopts red copper.
The working face of described heat-conducting plate 1 is square, and four temperature sensors and electricradiator are positioned at four angles, and a temperature sensor and electricradiator are positioned at center.
Beneficial effect
Laser shock peening method under a kind of heating condition that the present invention proposes and thermostatted, compared with conventional laser shock peening:
1, higher treatment temp can cause the increase of viscous deformation, result in the finer and closely woven and residual stress level of crystal grain and improves;
2, the higher dislocation desity of generation and solute atoms are to the bundle nail effect of dislocation, and produce precipitated carbide under strain inducing sedimentation, the bundle nail effect produced by dislocation obstacle and settling will hinder the slippage of dislocation when viscous deformation, thus improves the stability of dislocation when thermal annealing and when cyclic loading loads.
Accompanying drawing explanation
Fig. 1: heating laser shock peening device schematic diagram
1, heat-conducting plate, 2, five temperature sensors, 3, five electricradiators, 4, five temperature regulators, 5, silica glass, 6, plastics film, 7, metal works, 8, laser beam.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
In the present embodiment, thermostatted 1 adopts red copper to make, 2mm place installation five temperature sensors 2 under the surface at its four Ge Jiaohe center, and electricradiator 3 is installed at each temperature sensor 2 times 4mm places, and temperature sensor 2 and electricradiator 3 are connected on temperature regulator 4.
Restraint layer adopts silica glass 5, the transparent plastic film 6 that 0.1mm is thick on the pressure sensitive adhesive of surface, prevents constrained layer material to break in strengthening process splashing.
Metal work piece materials handled in the present embodiment is 4140 steel, and treatment process comprises the following steps:
Step 1: dirty with washes of absolute alcohol metal works 7 surface;
Step 2: metal works 7 is put into insulation can and heats, heating temperatures is extremely close to 300 ° of C.
Step 3: each temperature regulator 4 temperature of thermostatted is adjusted to 300 ° of C, domain of walker 10 ° of C, is placed on thermostatted 1 after temperature-stable by metal works 7, to be placed on restraint layer on metal works 7 and to compress.
Step 4: clamp on a robotic arm by thermostatted 1, metal works 7 and restraint layer entirety, adopts the tangent overlapping mode of hot spot to carry out laser impact intensified process to it.
Step 5: remove and change new restraint layer, semicircle overlap joint carries out laser impact intensified process, until hot spot covers whole region to be fortified.
Through aforesaid method, the process of heating laser shock peening is carried out to the metal works that material is 4140 steel, carried out unrelieved stress, fatigue property, the thermostability of unrelieved stress and stability of period with the conventional laser shock peening process of same laser parameter and contrasted.Result shows: 50 μm of places under material surface, and heating laser shock peening residual compressive stress improves more than 40%; Heating laser shock peening (S-N) curve moves to right, and under 1400MPa stress, improves 3.6 times fatigue lifetime; After the annealing in 10 hours of 300 ° of C, heating laser shock peening sample stress relief value is the half of conventional laser shock peening sample.After 1K cycle loads, the residual compressive stress numerical value of conventional laser shock peening sample have dropped 29%, and heating laser shock peening sample only have dropped 19%.
Claims (2)
1. the laser shock peening method under heating condition, is characterized in that step is as follows:
Step 1: the surface adopting washes of absolute alcohol work metal workpiece;
Step 2: heating of metal workpiece to 280 ~ 300 DEG C;
Step 3: the temperature of thermostatted is adjusted to 280 ~ 300 DEG C, is placed on metal works on thermostatted, to be placed on by restraint layer silica glass on metal works and to compress;
Step 4: paste the thick transparent plastic film of 0.1mm at Quartz glass surfaces;
Step 5: thermostatted, metal works and restraint layer entirety are installed in and become overall, adopts the tangent overlapping mode of hot spot to carry out laser impact intensified process to it;
Step 6: change new restraint layer, adopts semicircle overlap joint to proceed laser impact intensified process, until hot spot covers whole region to be fortified.
2. realize a thermostatted for the laser shock peening method under heating condition described in claim 1, it is characterized in that comprising heat-conducting plate (1), multiple temperature sensor (2), multiple electricradiator (3) and multiple temperature regulator (4); In the aspect of the working face distance 2mm with heat-conducting plate (1), center is provided with a temperature sensor, and surrounding is uniformly distributed and is provided with multiple temperature sensor; Apart from the aspect of this aspect 4mm, the position of each temperature sensor is provided with electricradiator; Each temperature sensor and electricradiator are electrically connected with respective temperature regulator; Described temperature sensor (2), electricradiator (3) are equal with temperature regulator (4) number; Described heat-conducting plate (1) adopts red copper; The working face of described heat-conducting plate (1) is square, and four temperature sensors and electricradiator are positioned at four angles, and a temperature sensor and electricradiator are positioned at center.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210492107.3A CN103834769B (en) | 2012-11-27 | 2012-11-27 | Laser shock peening method under heating condition and thermostatted |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210492107.3A CN103834769B (en) | 2012-11-27 | 2012-11-27 | Laser shock peening method under heating condition and thermostatted |
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| Publication Number | Publication Date |
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| CN103834769A CN103834769A (en) | 2014-06-04 |
| CN103834769B true CN103834769B (en) | 2016-02-24 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085479A (en) * | 2016-11-22 | 2018-05-29 | 中国科学院沈阳自动化研究所 | A kind of temperature-controlled laser shock peening high temperature stability maintenance method and apparatus |
| CN107389427A (en) * | 2017-07-10 | 2017-11-24 | 向勇 | Laser heating method and system |
| CN109186806A (en) * | 2018-10-12 | 2019-01-11 | 徐州天泽乘龙机械制造有限公司 | A kind of temperature sense system for storing metalwork |
| CN109454334A (en) * | 2018-10-24 | 2019-03-12 | 西安交通大学 | A kind of medium-temperature reinforced system and method for laser-impact |
| CN112981089B (en) * | 2021-02-03 | 2022-04-15 | 武汉大学 | Multi-laser cooperative auxiliary laser shock peening method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629227A (en) * | 2009-08-12 | 2010-01-20 | 江苏大学 | Reinforcement method and reinforcement device for improving high-temperature fatigue life of material |
| CN201414223Y (en) * | 2009-04-11 | 2010-02-24 | 瑞安市胜利印刷机械有限公司 | Electric heating plate used for bronzing machine |
| CN102513698A (en) * | 2011-12-29 | 2012-06-27 | 江苏大学 | Laser impact warm forming method with uniform heat and constant pressure functions and device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201414223Y (en) * | 2009-04-11 | 2010-02-24 | 瑞安市胜利印刷机械有限公司 | Electric heating plate used for bronzing machine |
| CN101629227A (en) * | 2009-08-12 | 2010-01-20 | 江苏大学 | Reinforcement method and reinforcement device for improving high-temperature fatigue life of material |
| CN102513698A (en) * | 2011-12-29 | 2012-06-27 | 江苏大学 | Laser impact warm forming method with uniform heat and constant pressure functions and device |
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| CN103834769A (en) | 2014-06-04 |
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Granted publication date: 20160224 Termination date: 20201127 |