研究目的
Comparing laser metal deposition of Inconel 718 from powder, hot and cold wire using a new direct diode laser head.
研究成果
The new direct diode laser head allows for direction-independent LMD processes with low oxygen take-up and high surface quality. All process variants yielded defect-free connections to the steel substrate, with the hot-wire process showing the highest deposition rate. The Laves phase, detrimental to mechanical properties, was present in all as-built samples but could be removed by heat treatment.
研究不足
The cooling rate was too low to prevent the formation of the Laves phase in all three process variants. Future work will focus on improving process settings for microstructure control.
1：Experimental Design and Method Selection:
The study compares three process variants (powder, cold-wire, and hot-wire) for laser metal deposition of Inconel 718 using a newly developed direct diode laser head.
2：Sample Selection and Data Sources:
IN718 wire and powder were used to build specimens on stainless steel plates.
3：List of Experimental Equipment and Materials:
A
4：2 kW direct diode laser head by OSCAR plt., KuKa KR 60 robot, IN718 wire and powder, stainless steel plates, and various gases for shielding and carrier purposes. Experimental Procedures and Operational Workflow:
Specimens were built using different process parameters, followed by heat treatment and microstructure analysis.
5：Data Analysis Methods:
Optical light microscopy and scanning electron microscopy were used for microstructure analysis.
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