研究目的
Investigating the influence of a protective environment during direct laser deposition on the formation of structure and properties of steel F690W (09CrNi2MoCu).
研究成果
The DLD process has been shown to be a perspective technology able to compete with traditional methods of manufacturing. The finest mechanical properties were obtained with regime 4 (without a pause) and 5 (pause interpass) in a protective medium with oxygen content below 300 ppm, caused by volumetric thermal cycling in the course of DLD.
研究不足
The study focuses on the influence of protective environments during DLD on the microstructure and mechanical properties of steel F690W, but does not explore the effects of other variables such as different materials or deposition techniques.
1：Experimental Design and Method Selection:
The study involved direct laser deposition (DLD) process of cold-resistant steel 09CrNi2MoCu (F690W) under different protective atmospheres.
2：Sample Selection and Data Sources:
The samples were produced with a different degree of molten pool protection by varying the rate of argon shielding gas.
3：List of Experimental Equipment and Materials:
Industrial robot LRM-200iD_7L (Fanuc), laser source LS-3 (IPG Photonics); laser processing head FLW D30 (IPG Photonics) equipped with removable cladding nozzle SO12 (Fraunhofer IWS), and a Sulzer Metco Twin 10C powder feeder.
4：Experimental Procedures and Operational Workflow:
Samples were obtained under specific conditions including laser power, processing speed, and powder consumption. Deposition in protective environment was performed in a sealed chamber filled with argon.
5：Data Analysis Methods:
Microstructural characterization was carried out with optical microscope Leica DMI 5000 M, scanning electron microscope Phenom Photo ProX and Vickers microhardness was measured using FUTURE TECH FM-310 hardness tester. The phase assembly of the samples was studied via energy dispersive spectrometry analysis (EDS).
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laser source
LS-3
IPG Photonics
Provides the laser power for the deposition process.
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laser processing head
FLW D30
IPG Photonics
Equipped with removable cladding nozzle for the deposition process.
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optical microscope
Leica DMI 5000 M
Leica
Used for microstructural characterization.
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industrial robot
LRM-200iD_7L
Fanuc
Used for direct laser deposition process.
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powder feeder
Twin 10C
Sulzer Metco
Feeds the powder material for the deposition process.
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scanning electron microscope
Phenom Photo ProX
Phenom
Used for microstructural characterization.
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hardness tester
FM-310
FUTURE TECH
Used for measuring Vickers microhardness.
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