研究目的
To analyze the influence of cutting fluid in the LMD process by depositing Inconel 718 on a part previously impregnated with cutting fluid and evaluate the influence of the different oil concentrations and cleaning methods employed in terms of porosity and clad quality.
研究成果
Admissible clads in terms of porosity and dilution can be obtained in hybrid processes of machining and LMD by introducing an intermediate cleaning stage. The lower the oil concentration, the lower the average porosity results, with the 5% oil concentration being the most favorable situation when using lubricant.
研究不足
The study demonstrates that cleaning methods can reduce porosity, but none of the values attained are comparable to the reference test when the substrate is impregnated with pure oil (100% concentration).
1：Experimental Design and Method Selection:
The study evaluates the influence of coolants in the LMD process from the point of view of pore generation and clad quality. Tests are performed on a part impregnated with cutting fluid, both directly and after the elimination of the fluid by means of different alternatives.
2：Sample Selection and Data Sources:
Inconel 718 substrate is covered with an oil-water emulsion. The emulsion is prepared by mixing water and Houghton HOCUT B-750 cutting fluid with oil concentrations of 5, 10, and 100%.
3：0%.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A 5-axis milling center rebuilt as a laser-processing machine, a Yb:YAG fiber laser source (Rofin FL010), a Sulzer Metco Twin 10-C powder feeder, and a coaxial LMD nozzle (EHUCoax-2015) are used. Inconel 718 and MetcoClad 718 gas-atomized nickel-base superalloy powder are the materials.
4：Experimental Procedures and Operational Workflow:
For each concentration, direct deposition (without cleaning), deposition after air blasting, and after laser cleaning are performed. Air blasting is done with 7 bar air pressure, while laser cleaning is carried out at 200 W and 100 mm defocusing distance.
5：Data Analysis Methods:
Three cross sections of each sample are extracted, polished, and etched. Images of each section are acquired and analyzed using Matlab R2017b software to determine the resulting porosity within the deposited material.
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