研究目的
Investigating the effect of Direct Laser Deposition (DLD) process parameters on defect formation, structure, and mechanical properties of titanium alloy Ti-6Al-4V parts.
研究成果
Optimal regimes for direct laser deposition of large-sized thick-walled products from titanium alloy Ti-6Al-4V were established. Increasing process speed leads to material embrittlement, likely due to rapid cooling forming metastable phases. Solutions include two-stage heat treatment or using a scanner to maintain temperature.
研究不足
The study is limited by the maximum power not causing laser flame and the speed not exceeding 40 mm/s to avoid defect formation. The process's economic efficiency and the need for subsequent heat treatment or temperature maintenance solutions are also limitations.
1：Experimental Design and Method Selection:
The study varied laser power (1200-2000 W) and speed (20-50 mm/s) to examine their effects on defect formation and mechanical properties.
2：Sample Selection and Data Sources:
Titanium alloy Ti-6Al-4V powder was used for deposition.
3：List of Experimental Equipment and Materials:
Equipment included a 5kW IPG fiber laser YLS-5000, 5D CNC machine, Sultzer Metco Twin 10-C powder feeder, and HighYAG BIMO processing head.
4：Experimental Procedures and Operational Workflow:
The process was conducted in an argon atmosphere, with samples cut and etched for defect analysis.
5：Data Analysis Methods:
Mechanical properties were tested using a Zwick/Roell Z250 Allround universal testing machine, and structure was studied with an optical microscope LOMO.
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IPG fiber laser YLS-5000
YLS-5000
IPG
Used for direct laser deposition process
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Sultzer Metco Twin 10-C powder feeder
Twin 10-C
Sultzer Metco
Feeds powder material into the laser beam action zone
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HighYAG BIMO processing head
BIMO
HighYAG
Processing head for laser deposition
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Zwick/Roell Z250 Allround universal testing machine
Z250 Allround
Zwick/Roell
Used for mechanical tensile testing of deposited samples
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optical microscope LOMO
MC3
LOMO
Studying the structure of samples
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