EP2115176A1 - Verfahren zur oberflächenverfestigung metallischer bauteile - Google Patents
Verfahren zur oberflächenverfestigung metallischer bauteileInfo
- Publication number
- EP2115176A1 EP2115176A1 EP08706831A EP08706831A EP2115176A1 EP 2115176 A1 EP2115176 A1 EP 2115176A1 EP 08706831 A EP08706831 A EP 08706831A EP 08706831 A EP08706831 A EP 08706831A EP 2115176 A1 EP2115176 A1 EP 2115176A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- plasma
- coating
- light emission
- emission values
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/631—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited using photolysis and investigating photolysed fragments
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/636—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited using an arrangement of pump beam and probe beam; using the measurement of optical non-linear properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/718—Laser microanalysis, i.e. with formation of sample plasma
Definitions
- the invention relates to a method for surface hardening of metallic components according to the preamble of claim 1.
- a method for surface hardening of metallic components by means of a laser shock blasting process is known.
- a coating is applied to a surface of a metallic component to be solidified, which is decomposed by means of a laser beam provided by a processing laser.
- the laser beam provided by the processing laser is preferably a pulsed laser beam.
- a plasma is generated from the decomposing coating, which shock waves are induced by interaction of the plasma with the metallic surface of the component, which plastically deform the surface and thus induce compressive residual stresses in the same. As a result, the surface of the component is solidified.
- EP 1 637 616 A2 It is further known from EP 1 637 616 A2 to monitor the laser shock blasting process by detecting light emission values of the plasma. On the basis of the measured values recorded here, the laser shock blasting process can be controlled or regulated. According to EP 1 637 616 A2, the detection of the light emission values of the plasma takes place with the aid of a spectrometer, wherein spectral emissions of the plasma are focused via a lens and then introduced into the spectrometer. A disadvantage of this detection of the light emission values of the plasma is that the measured values have a strong background signal of the plasma resulting from recombination and bremsstrahlung radiation in the so-called plasma afterglow.
- the present invention is based on the problem to provide a novel method for surface hardening of metallic components.
- This problem is solved by a method according to claim 1.
- the light emission values of the plasma are detected with the aid of a measuring laser with a time delay for the decomposition of the coating with the aid of the processing laser.
- the light emission values of the plasma are detected with the aid of a measuring laser with a time delay for the decomposition of the coating and thus for the generation of the plasma with the aid of the processing laser.
- light emission values can be provided which are almost free from a disturbing background signal of the plasma, so that the detected light emission values of the plasma can be unambiguously related to the laser shock blasting process.
- the light emission values recorded according to the invention it is therefore possible to make a statement about the efficiency of a laser shock blasting process and to precisely control it.
- the present invention relates to a method for surface hardening of metallic components by means of a laser shock blasting process.
- the method is preferably used in the surface consolidation of gas turbine components.
- the laser shock blasting process is monitored by detecting light emission values of the plasma generated during the laser shock blasting process, wherein the light emission values of the plasma are temporarily measured by means of a measuring laser. requires the formation of the plasma to be detected.
- the plasma is generated by decomposing a coating applied to the surface of the component to be solidified with the aid of a processing laser.
- the invention is based on the finding that background radiation resulting from recombination radiation and bremsstrahlung in the plasma afterglow decreases sharply immediately after the generation of the plasma. Accordingly, when light emission values of the plasma are detected with a time delay for generation thereof, they are almost free of background radiation. In this case, it is then possible to correlate the light emission values with the laser shock blasting process and to make a clear statement about the efficiency of the laser shock blasting process.
- the time delay between the detection of the light emission levels of the plasma and the generation thereof is a few nanoseconds, preferably between 5 and 50 nanoseconds.
- the time delay between the detection of the light emission levels of the plasma and the generation thereof is on the order of about 10 nanoseconds.
- the measuring laser used is preferably a pulsed measuring laser, wherein a measuring pulse of the pulsed measuring laser is time-delayed to a processing pulse of a pulsed processing laser, preferably of the order of magnitude specified above.
- a carbon-containing paint based on organic substances is applied as a coating on the surface of the component to be consolidated.
- This organic-based carbonaceous paint is decomposed by the processing laser by pyrolysis to provide the plasma.
- a metallic film or a metallic film in particular an aluminum foil or an aluminum film, to the metallic surface of the component to be solidified.
- Such coatings are decomposed by evaporation with the aid of the processing laser. Following the pyrolysis or evaporation of the coating, an ionization with electrical excitation of coating-specific atoms or molecules takes place, wherein this excitation can be detected by measuring the light emission values.
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Nonlinear Science (AREA)
- Laser Beam Processing (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007006302A DE102007006302A1 (de) | 2007-02-08 | 2007-02-08 | Verfahren zur Oberflächenverfestigung metallischer Bauteile |
| PCT/DE2008/000165 WO2008095465A1 (de) | 2007-02-08 | 2008-01-31 | Verfahren zur oberflächenverfestigung metallischer bauteile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2115176A1 true EP2115176A1 (de) | 2009-11-11 |
Family
ID=39456529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08706831A Withdrawn EP2115176A1 (de) | 2007-02-08 | 2008-01-31 | Verfahren zur oberflächenverfestigung metallischer bauteile |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20100006187A1 (de) |
| EP (1) | EP2115176A1 (de) |
| CA (1) | CA2676501A1 (de) |
| DE (1) | DE102007006302A1 (de) |
| WO (1) | WO2008095465A1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2180015T3 (es) * | 1996-04-10 | 2003-02-01 | Sulzer Orthopaedie Ag | Implante metalico que comprende una superficie y procedimiento para fabricar la superficie. |
| US6075593A (en) * | 1999-08-03 | 2000-06-13 | General Electric Company | Method for monitoring and controlling laser shock peening using temporal light spectrum analysis |
| DE10250015B3 (de) | 2002-10-25 | 2004-09-16 | Universität Kassel | Adaptive, rückkopplungsgesteuerte Materialbearbeitung mit ultrakurzen Laserpulsen |
| US7273998B2 (en) | 2004-09-15 | 2007-09-25 | General Electric Company | System and method for monitoring laser shock processing |
-
2007
- 2007-02-08 DE DE102007006302A patent/DE102007006302A1/de not_active Withdrawn
-
2008
- 2008-01-31 US US12/526,252 patent/US20100006187A1/en not_active Abandoned
- 2008-01-31 EP EP08706831A patent/EP2115176A1/de not_active Withdrawn
- 2008-01-31 WO PCT/DE2008/000165 patent/WO2008095465A1/de not_active Ceased
- 2008-01-31 CA CA002676501A patent/CA2676501A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008095465A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007006302A1 (de) | 2008-08-14 |
| CA2676501A1 (en) | 2008-08-14 |
| WO2008095465A1 (de) | 2008-08-14 |
| US20100006187A1 (en) | 2010-01-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20090804 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
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| DAX | Request for extension of the european patent (deleted) | ||
| 17Q | First examination report despatched |
Effective date: 20120720 |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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| INTG | Intention to grant announced |
Effective date: 20160302 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20160713 |