研究目的
To broaden the understanding of how the combination of a protective gas module and the influence of a mixture of argon and helium may affect the Laser Metal Deposition (LMD) process for a highly reactive alloy like Ti6Al4V.
研究成果
Titanium alloy Ti6Al4V seemed to be unaffected by the helium present in the mixture on the LMD process. Gas mixture composition’s influence was negligible in contrast with the flow rates of the mixtures, which seemed to have some impact on the wet angle and height of the tracks. The height and wet angle variations because of the gas flow increments could be product of changes on the powder concentration or results of plasma creation in the laser beam way caused by the highest laser power tested.
研究不足
The study was limited to the analysis of the influence of gas mixtures and flow rates on the LMD process for Ti6Al4V alloy. The specific energy of 42 J·mm-2 could be the limit required for plasma plume creation, but the study of this phenomenon was out of the scope of the present work.
1：Experimental Design and Method Selection:
The study involves the melt-pool temperature measurement and characterization of the deposited clads variating not only the composition of the protective gas but also the flow rates.
2：Sample Selection and Data Sources:
A titanium-based alloy, Ti6Al4V, was selected for the study. The chemical composition of filling material and substrate are similar according to the suppliers' specification.
3：List of Experimental Equipment and Materials:
The experimental setup includes a laser processing cell equipped with five-axis cinematics and a Yb:YAG fiber laser of 1 kW, Rofin FL010 with a 1070 nm wavelength, a powder feeder Sulzer Metco Twin 10-C, and a two-color pyrometer Lumasense IGAR 12-LO.
4：Experimental Procedures and Operational Workflow:
Parameters were tested multiple times in 30 mm-long tracks to ensure repetitiveness. The melt-pool temperature was measured coaxially guiding the pyrometer through the same optical path of the laser.
5：Data Analysis Methods:
Multiple cross-sections of the clads were analyzed to evaluate the influence of the gas mixtures. The cutting was carried out by a silicon carbide cut-off wheel and then etched with Kroll to analyze the microstructure.
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