CN105648201A - Method for improving repairing effect of self-repairing material through laser shock waves - Google Patents
Method for improving repairing effect of self-repairing material through laser shock waves Download PDFInfo
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- CN105648201A CN105648201A CN201610172157.1A CN201610172157A CN105648201A CN 105648201 A CN105648201 A CN 105648201A CN 201610172157 A CN201610172157 A CN 201610172157A CN 105648201 A CN105648201 A CN 105648201A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention relates to the reproducing field, in particular to a method for improving the repairing effect of a self-repairing material through laser shock waves. A laser shock peening method is adopted for mainly solving the problem that a self-repairing material has the poor self-repairing effect on surface layer micro cracks. Generated shock wave pressure can enable a microcapsule wall at the positions of the self-repairing material micro cracks to be completely fractured, repairing fluid completely flows out to be sufficiently mixed with a catalyst to bond the cracks, and the bonding effect is improved. Meanwhile, due to the laser shock function, plastic deformation is generated on the surface layer of the material, a hollow part, generated due to flowing out of a repairing agent, of a microcapsule is compacted and disappears, and micro cracks not penetrating the microcapsule can be bonded as well. In addition, due to the laser shock function, the cracks and surface layer grains in the peripheral area are refined, a surface layer structure is more compact, a residual compressive stress layer generated due to induction of the laser shock function can effectively balance the tensile stress in the material using process, and therefore diffusion of the cracks and generation of new cracks are effectively prevented.
Description
Technical field
The present invention relates to the field of remanufacturing, refer in particular to a kind of method utilizing laser blast wave to improve self-repair material repairing effect. The early discovery of micro-crack is also repaired the material application in fields such as Aero-Space, automobile making, electronics technologies most important in time.
Background technology
In fields such as automobile making, Aero-Space, electronics technologies, kernel component at work, due to the effect such as loaded, abrasion, impact, fatigue, is easily generated crackle, causes material scrap. Therefore adopt recovery technique that the parts that there is crack defect are repaired, extend its service life, considerable economic benefit can be obtained. Current Crack Repairing method has manual electric arc welding, submerged-arc welding, vibration welding, chromium plating, metal spraying, the modes such as metal is gluing, but these repair modes are all single repairing from outer surface, although manual operation is strong, but error is relatively big, leaves cicatrix, surface irregularity after reparation, repairing effect is undesirable, and is only applicable to repair bigger macroscopic crackle.
According to crack propagation mechanism, it has been found that crackle is once after being formed, expansion rate can be more and more faster. Therefore at the initial stage of crack initiation it is repaired and just seem particularly significant. Now repair and can extend by Crack prevention in time, the most easily recover mechanical performance, reach the demand produced that works on, and economic costs is the most cheap. But it is narrower, shallower, irregular that crackle forms initial stage major part, and size is very trickle, reaches micron dimension, and naked eyes are difficult to distinguish, therefore, it is difficult to be suitable for above-mentioned restorative procedure.
A kind of method using embedded microcapsule technology repair materials top layer micro-crack just risen recently can effectively solve the problem that this difficult problem. Fill the catalyst needed for a kind of microcapsule comprising renovation agent and curing reaction when the principle of this technology is the manufacture of materials initial stage therein, do not contact with catalyst owing to renovation agent is wrapped in microcapsule, therefore curing reaction does not occur. When crackle intrudes into a certain degree, effect microcapsule wall will break, and then discharges repair liquid, and d/d repair liquid is filled crackle contacting with catalyst and reacted, bonding crackle.Data shows that this technology can make the most toughness recovery in material crack place. But this technology also has its shortcoming: owing to the propagation pressure of micro-crack is less, effect microcapsule wall can not be made to be completely severed, cause that the repair liquid included can not flow completely out, especially when the microcapsule negligible amounts in crack initiation region, very easily cause repair liquid cannot fill whole crackle, cause that restoring area contains a large amount of pore, and after repair liquid outflow, capsule is also by producing the pore of hollow, thus being substantially reduced repairing effect; When micro-crack is shallower, does not pass through microcapsule, then cannot obtaining selfreparing, therefore such crackle also may proceed to extension; And self-repair material can only repair the crackle generated, it is impossible to prevent the germinating of the new crackle in crackle peripheral region.
Laser impact intensified (being again laser peening) is a kind of novel material surface strengthening technology, utilize strong laser induced knock wave mechanics effect that material is processed, the residual compressive stress layer of its formation can effectively eliminate the stress of material internal and concentrates and suppress germinating and the extension of crackle, the fatigue life of metal parts can be significantly improved, substantial amounts of research proves that reiforcing laser impact technology is to extend the crack initiation time, reduces crack propagation velocity and improves the effective means of material lifetime.
Summary of the invention
The problem undesirable in order to solve self-repair material repairing effect, the invention provides a kind of method utilizing laser blast wave to improve self-repair material repairing effect; The laser-impact wave pressure of up to GPa magnitude, can make self-repair material top layer (up to about 1mm depth bounds) micro-crack place effect microcapsule wall be completely severed, and repair liquid flows completely out and is sufficiently mixed bonding crackle with catalyst, promotes bonding effect; Simultaneously because the effect of laser-impact, the surface layer grain making crackle and peripheral region is refined, textura epidermoidea is more tight, and the residual compressive stress layer that produces of its induction can the tension in balancing material use procedure effectively, thus effectively prevent crackle diffusion and the generation of new crackle.
Concretely comprise the following steps:
(1) choose laser impact intensified technological parameter, including pulsed laser energy, pulsewidth, spot diameter, transverse lap rate and longitudinal lap joint rate, selfreparing matrix material is carried out laser impact intensified test, it is thus achieved that laser impact intensified influence depth H.
In this step, due to the laser impact intensified mechanical property being effectively improved material, its influence depth is the degree of depth that mechanical property improves. The influence depth H of therefore described laser-impact self-repair material can be obtained by the firmness change mode of material on depth direction after experiments of measuring.
Process parameters range in laser impact intensified experimentation is: pulsed laser energy 3-9J, pulsewidth 5-20ns, spot diameter 1-3mm, and transverse lap rate and longitudinal lap joint rate are 30%-50%. Aluminium foil is as absorbed layer, and thickness is 0.1mm; Flowing water is as transparent restraint layer, and thickness is 1mm.
(2) the depth capacity h of damaged metal part crackle is measured, in order to reach best repair effect, it is desirable to meet 0 < h < 3H/4 this condition, then can adopt methods described herein.
Owing to effect microcapsule wall is more fragile, the propagation pressure (being typically smaller than 20MPa) of fine crack can make it break, and surge produced by laser blast wave is up to GPa magnitude, although can decay to some extent when propagating in the depth direction, but when meeting 0 < h < 3H/4 this condition, pressure produced by laser blast wave breaks desirable pressure also much larger than effect microcapsule wall in h depth bounds, and therefore cyst wall required concrete force value of breaking need not consider.
(3) matrix surface of damage component crackle and peripheral region being polished, use abrasive paper for metallograph from coarse to fine during polishing, it is ensured that the matrix surface flat smooth of crackle peripheral region after polishing, roughness is less than or equal to Ra0.3; Then use acetone to clean crackle, remove the oil stain of residual.
Described peripheral region refers to 3mm range areas around damage component crackle, further, refers to crack profile for benchmark, the region of outward expansion 3mm.
(4) pasting one layer of aluminium foil as absorbed layer at material upper surface, aluminium foil need to cover whole slit region and the surface of crackle peripheral region matrix material; Then with flowing water as transparent restraint layer, it is carried out the laser impact intensified of large area overlap joint.
Wherein laser impact intensified parameter is consistent with laser parameter used during mensuration H in step (1), is similarly: pulsed laser energy 3-9J, pulsewidth 5-20ns, spot diameter 1-3mm, and transverse lap rate and longitudinal lap joint rate are 30%-50%. The thickness of absorbed layer is 0.1mm, and the thickness of transparent restraint layer is 1mm.
(5) embedded microcapsule is under the effect of shock wave pressure, and cyst wall is almost completely severed, and renovation agent flows out. Being 25 DEG C by the damage component sample after shock peening in temperature, solidify when pressure is 20MPa, in order to reach optimum adhesion effect, selecting hardening time is 24 hours.
(6) remove aluminium foil, polish and clean the matrix surface of the damage component crackle after solidification and peripheral region, so far completing the repair of damage component.
Beneficial effects of the present invention: selfreparing damage component is carried out laser impact intensified according to said method, the then laser-impact wave pressure of up to GPa magnitude, self-repair material micro-crack place effect microcapsule wall can be made to be completely severed, repair liquid flows completely out and is sufficiently mixed bonding crackle with catalyst, promotes bonding effect; Simultaneously because the effect of laser-impact, cause that material surface produces plastic deformation so that the hollow space that microcapsule produces because renovation agent flows out is compacted and disappears, and the micro-crack for not passing through microcapsule is also healed; Additionally, effect due to laser-impact so that the surface layer grain of crackle and peripheral region is refined, and textura epidermoidea is tightr, the residual compressive stress layer that its induction produces can the tension in balancing material use procedure effectively, thus effectively prevent crackle diffusion and the generation of new crackle.
Accompanying drawing explanation
Fig. 1 is the flow process chart that methods described herein improve self-repair material repairing effect.
Fig. 2 is the schematic diagram of self-repair material selfreparing effect.
Fig. 3 is the schematic diagram adopting methods described herein to improve self-repair material repairing effect.
Fig. 4 is the selfreparing AM50 magnesium alloy crackle peripheral region metallographic structure figure without laser impact intensified top layer.
Fig. 5 is selfreparing AM50 magnesium alloy crackle peripheral region metallographic structure figure on top layer after laser impact intensified.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but the present invention should not be limited only to embodiment.
The sample that the present embodiment adopts is the selfreparing AM50 magnesium alloy that germinating has micro-crack, and both material was when producing, and embedded in the catalyst needed for the microcapsule and curing reaction comprising renovation agent therein. The physical dimension of selfreparing AM50 magnesium alloy is 100mm �� 30mm �� 10mm.
A kind of example using above-mentioned processing method to repair sample, the steps include:
(1) selfreparing AM50 magnesium alloy substrate material being carried out laser impact intensified experiment, measuring laser impact intensified influence depth H in this material is 1mm.
Selected laser impact intensified technological parameter is: pulsed laser energy 6J, pulsewidth 20ns, spot diameter 3mm, transverse lap rate and longitudinal lap joint rate are 50%. Aluminium foil is as absorbed layer, and thickness is 0.1mm; Flowing water is as transparent restraint layer, and thickness is 1mm.
(2) measure the depth capacity h of damaged metal part crackle, be 0.6mm through measuring h, meet 0 < h < 3H/4 this condition, therefore can adopt methods described herein.
(3) matrix surface of damage component crackle and surrounding 3mm range areas being polished, use abrasive paper for metallograph from coarse to fine, it is ensured that the matrix surface flat smooth of crackle peripheral region after polishing during polishing, roughness is less than or equal to Ra0.3; Then use acetone to clean crackle, remove the oil stain of residual.
(4) one layer of aluminium foil is pasted as absorbed layer at material upper surface, it is ensured that aluminium foil can cover the surface of the matrix material of crackle and surrounding 3mm range areas; Then with flowing water as transparent restraint layer, it is carried out laser impact intensified.
Wherein laser impact intensified parameter is consistent with laser parameter used during mensuration H in step (1), is similarly: pulsed laser energy 6J, pulsewidth 20ns, spot diameter 3mm, and transverse lap rate and longitudinal lap joint rate are 50%. The thickness of absorbed layer is 0.1mm, and the thickness of transparent restraint layer is 1mm.
(5) being 25 DEG C by the selfreparing AM50 magnesium alloy sample after shock peening in temperature, solidify when pressure is 20MPa, in order to reach optimum adhesion effect, selecting hardening time is 24 hours.
(6) remove aluminium foil, polish and clean the matrix surface of the damage component crackle after solidification and peripheral region.
So far the repair of damage component is completed.
Gained picture is as follows:
As shown in Figure 2, it is provided without methods described herein, micro-crack is carried out selfreparing by the repair ability against material itself, resulting in effect microcapsule wall can not be completely severed, the repair liquid included can not flow completely out, and causes repair liquid cannot fill whole crackle, cause that restoring area contains a large amount of pore, and after repair liquid outflow, capsule is also by producing the pore of hollow, thus being substantially reduced repairing effect; And for not passing through the micro-crack of microcapsule, then cannot obtain selfreparing, therefore such crackle also may proceed to extension.
As shown in Figure 3, methods described herein are adopted to carry out laser impact intensified to selfreparing damage component, result shows, higher laser-impact wave pressure, self-repair material micro-crack place effect microcapsule wall can be made to be completely severed, repair liquid flows completely out and is sufficiently mixed bonding crackle with catalyst, promotes bonding effect; Simultaneously because the effect of laser-impact, cause that material surface produces plastic deformation so that the hollow space that microcapsule produces because renovation agent flows out is compacted and disappears, and the micro-crack for not passing through microcapsule is also healed; Additionally, effect due to laser-impact so that the surface layer grain of crackle and peripheral region is refined, and textura epidermoidea is tightr, the residual compressive stress layer that its induction produces can the tension in balancing material use procedure effectively, thus effectively prevent crackle diffusion and the generation of new crackle.
As shown in Figure 4, unused laser impact intensified method, both repaired micro-crack against the self-reparing capability of material self, the mantle micro structure porosity of its crackle peripheral region is larger, and crystal grain is also thicker.
As shown in Figure 5, adopting laser impact intensified method described herein to repair AM50 magnesium alloy top layer micro-crack, its crackle peripheral region is strengthened, and surface layer grain is refined, organizational structure is more tight in order, the generation being effectively prevented in crackle peripheral region new crackle.
Claims (9)
1. one kind utilizes the method that laser blast wave improves self-repair material repairing effect, it is characterized in that: adopt laser impact intensified method, the renovation agent effect microcapsule wall that in self-repair material, micro-crack place fills is completely severed, repair liquid flows completely out and is sufficiently mixed bonding crackle with the catalyst in material, promotes bonding effect; Simultaneously because the effect of laser-impact, cause that material surface produces plastic deformation so that the hollow space that microcapsule produces because renovation agent flows out is compacted and disappears, and the micro-crack for not passing through microcapsule is also healed; Additionally, effect due to laser-impact so that the surface layer grain of crackle and peripheral region is refined, and textura epidermoidea is tightr, the residual compressive stress layer that its induction produces can the tension in balancing material use procedure effectively, thus effectively prevent crackle diffusion and the generation of new crackle.
2. as claimed in claim 1 a kind of utilize laser blast wave improve self-repair material repairing effect method, it is characterised in that: concretely comprise the following steps:
(1) the depth capacity h of damaged metal part crackle is measured, it is desirable to satisfied 0 < h < 3H/4, H is laser impact intensified influence depth;
(2) matrix surface of damage component crackle and crackle peripheral region being polished, use abrasive paper for metallograph from coarse to fine during polishing, it is ensured that the matrix surface flat smooth of crackle peripheral region after polishing, roughness is less than or equal to Ra0.3; Then use acetone to clean crackle, remove the oil stain of residual;
(3) pasting one layer of aluminium foil on damage component surface as absorbed layer, aluminium foil need to cover whole slit region and the surface of crackle peripheral region matrix material; Then with flowing water as transparent restraint layer, it is carried out the laser impact intensified of large area overlap joint;
(4) embedded microcapsule is under the effect of shock wave pressure, and cyst wall is almost completely severed, and renovation agent flows out, and is solidified by the damage component sample after shock peening;
(5) remove aluminium foil, polish and clean the matrix surface of the damage component crackle after solidification and peripheral region, so far completing the repair of damage component.
3. as claimed in claim 2 a kind of utilize laser blast wave improve self-repair material repairing effect method, it is characterised in that the acquisition pattern of laser impact intensified influence depth H is as follows:
Choose laser impact intensified technological parameter, including pulsed laser energy, pulsewidth, spot diameter, transverse lap rate and longitudinal lap joint rate, selfreparing matrix material is carried out laser impact intensified test, it is thus achieved that laser impact intensified influence depth H.
4. as claimed in claim 3 a kind of utilize laser blast wave improve self-repair material repairing effect method, it is characterised in that: laser impact intensified influence depth H is obtained by the firmness change mode of material on depth direction after laser impact intensified test.
5. as claimed in claim 3 a kind of utilize laser blast wave improve self-repair material repairing effect method, it is characterized in that: the process parameters range in laser impact intensified experimentation is: pulsed laser energy 3-9J, pulsewidth 5-20ns, spot diameter 1-3mm, transverse lap rate and longitudinal lap joint rate are 30%-50%. Aluminium foil is as absorbed layer, and thickness is 0.1mm; Flowing water is as transparent restraint layer, and thickness is 1mm.
6. as claimed in claim 2 a kind of utilize laser blast wave improve self-repair material repairing effect method, it is characterised in that: described crackle peripheral region refers to 3mm range areas around damage component crackle.
7. as claimed in claim 6 a kind of utilize laser blast wave improve self-repair material repairing effect method, it is characterised in that: described crackle peripheral region refers to crack profile for benchmark, the region of outward expansion 3mm.
8. as claimed in claim 2 a kind of utilize laser blast wave improve self-repair material repairing effect method, it is characterized in that: laser impact intensified parameter is: pulsed laser energy 3-9J, pulsewidth 5-20ns, spot diameter 1-3mm, transverse lap rate and longitudinal lap joint rate are 30%-50%. The thickness of absorbed layer is 0.1mm, and the thickness of transparent restraint layer is 1mm.
9. as claimed in claim 2 a kind of utilize laser blast wave improve self-repair material repairing effect method, it is characterized in that: be 25 DEG C by the damage component sample after shock peening in temperature, pressure solidifies when being 20MPa, in order to reach optimum adhesion effect, selecting hardening time is 24 hours.
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Cited By (6)
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| CN106435158A (en) * | 2016-10-09 | 2017-02-22 | 南通大学 | Workpiece surface laser shocking process utilizing surface micro textures for removing residual stress holes |
| CN106555046A (en) * | 2016-11-30 | 2017-04-05 | 北京石油化工学院 | A kind of method for eliminating welding residual stress |
| CN106755945A (en) * | 2017-01-03 | 2017-05-31 | 安徽工业大学 | A kind of method and device for changing crack propagation path based on laser shock wave technology |
| CN109777977A (en) * | 2017-06-10 | 2019-05-21 | 黄国新 | A kind of punching machine rushes the manufacturing method of stick |
| US20200102634A1 (en) * | 2017-05-26 | 2020-04-02 | University Of The Witwatersrand, Johannesburg | Method and System for Improving the Surface Fracture Toughness of Brittle Materials, and a Cutting Tool Produced by Such Method |
| WO2020082846A1 (en) * | 2018-10-25 | 2020-04-30 | 广东工业大学 | Laser shock strengthening method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106435158A (en) * | 2016-10-09 | 2017-02-22 | 南通大学 | Workpiece surface laser shocking process utilizing surface micro textures for removing residual stress holes |
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| CN106555046B (en) * | 2016-11-30 | 2018-02-23 | 北京石油化工学院 | A kind of method for eliminating welding residual stress |
| CN106755945A (en) * | 2017-01-03 | 2017-05-31 | 安徽工业大学 | A kind of method and device for changing crack propagation path based on laser shock wave technology |
| CN106755945B (en) * | 2017-01-03 | 2018-06-08 | 安徽工业大学 | A kind of method and device for changing crack propagation path based on laser shock wave technology |
| US20200102634A1 (en) * | 2017-05-26 | 2020-04-02 | University Of The Witwatersrand, Johannesburg | Method and System for Improving the Surface Fracture Toughness of Brittle Materials, and a Cutting Tool Produced by Such Method |
| US12109616B2 (en) * | 2017-05-26 | 2024-10-08 | University Of The Witwatersrand | Method and system for improving the surface fracture toughness of brittle materials, and a cutting tool produced by such method |
| CN109777977A (en) * | 2017-06-10 | 2019-05-21 | 黄国新 | A kind of punching machine rushes the manufacturing method of stick |
| WO2020082846A1 (en) * | 2018-10-25 | 2020-04-30 | 广东工业大学 | Laser shock strengthening method |
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