1：Experimental Design and Method Selection:

The study involved the use of a coaxial melt pool monitoring system to observe the melt pool behavior during the LBM-M process. The system included a CMOS-camera and a photodiode aligned coaxially to detect thermal emissions from the melt pool.

2：Sample Selection and Data Sources:

Inert gas atomized stainless steel 1.4057 powder was used. The powder's particle size distribution and sphericity were analyzed using dynamic image processing.

3：4057 powder was used. The powder's particle size distribution and sphericity were analyzed using dynamic image processing. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: A M2 Dual Laser system from Concept Laser GmbH, equipped with two 400 Watt fiber lasers, was used. The system included a commercial coaxial melt pool monitoring system.

4：Experimental Procedures and Operational Workflow:

Single melt tracks were tested under varying input energies to define a parameter set. Test cubes were built to evaluate the density and quality of the parts. The melt pool monitoring system was used to analyze the process stability and reproducibility.

5：Data Analysis Methods:

The data from the melt pool monitoring system was processed by a field programmable gate array (FPGA) for analysis and data reduction. Cross sections of the test cubes were analyzed for porosity and microstructure.