研究目的
Investigating the optical properties of surface layers produced by laser surface melting and nitriding of titanium alloy Ti6Al4V, and proposing a methodology for determining the absorption value for 808 nm wavelength of high power diode laser radiation.
研究成果
The study found significant differences in absorption between surface layers produced by laser melting in argon and nitriding in nitrogen, affecting heat transfer and penetration depth. The proposed methodology for determining absorption values provides a basis for controlling laser surface treatment processes.
研究不足
The study was limited to the optical properties at room temperature and during laser processing, with a focus on the 808 nm wavelength. The effects of other wavelengths and broader temperature ranges were not explored.
1：Experimental Design and Method Selection:
The study involved measuring optical properties of titanium alloy Ti6Al4V under different surface conditions and after laser surface treatments.
2：Sample Selection and Data Sources:
Samples included titanium alloy Ti6Al4V in as-received, polished, and oxidized conditions, and surface layers produced by laser melting and nitriding.
3：List of Experimental Equipment and Materials:
High power direct diode laser (HPDDL) ROFIN DL 020, pyrometer IMPAC IS 140, infrared camera ThermaCAM P640, multichannel numerical recorder Agilent 34970A, and others.
4：Experimental Procedures and Operational Workflow:
Measurements of re?ectance were performed using an Ocean Optics PC2000-ISA-PC Plug-in Spectrometer and ISP-REF Integrating Sphere. Temperature measurements were conducted during laser processing.
5：Data Analysis Methods:
Reflectivity and absorption coefficients were determined based on the measurements. Temperature data were analyzed to estimate absorption coefficients during laser processing.
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multichannel numerical recorder
Agilent 34970A
Agilent
Used for acquisition and recording of data.
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spectrometer
Ocean Optics PC2000-ISA-PC Plug-in Spectrometer
Ocean Optics
Used for measurements of re?ectance.
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high power direct diode laser
ROFIN DL 020
ROFIN SINAR LASER
Used for laser surface melting and nitriding of titanium alloy.
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pyrometer
IMPAC IS 140
IMPAC Infrared GmbH
Used for temperature measurements during laser processing.
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infrared camera
ThermaCAM P640
Used for non-contact temperature measurements.
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portable surface roughness tester
SJ-210 Surftest
Mitutoyo Corporation
Used for measurements of surface roughness.
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metallographic light microscope
Nikon Eclipse MA100
NIKON CORPORATION
Used for determining the thickness of titanium nitrides or surface oxide layers.
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scanning electron microscopy
Carl Zeiss
Used for microstructure analysis.
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energy dispersive spectrometer
Carl Zeiss
Used for chemical composition analysis.
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integrating sphere
ISP-REF Integrating Sphere
Used for re?ectance measurements.
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