研究目的
Investigating the effect of building orientation on surface roughness and microhardness of 18% Ni Maraging steel 300 fabricated using Direct Metal Laser Sintering (DMLS).
研究成果
The orientation showed a significant role on the surface roughness and hardness due to change in heat flow for laser melted regions. Vertically oriented samples have more stress concentration than horizontally oriented due to heat flow in the low specific region that leads to variation in surface integrity and mechanical properties. This study will help the producers to understand the effect of building orientation in building direction on the surface roughness and microhardness to fabricate complex shapes of desired properties.
研究不足
The study focuses on the effect of building orientation on surface roughness and microhardness but does not investigate the microstructure and texture evolution or the effect of heat treatment on mechanical behavior.
1：Experimental Design and Method Selection:
The study examines the variations in surface finish and microhardness using three building orientations (0?, 45?, and 90?) for DMLS fabricated 18% Ni Maraging steel
2：Sample Selection and Data Sources:
3 Samples of size 45*45*5 mm3 for different orientations were fabricated using DMLS. Twelve samples of size 10*10*5 mm3 were machined using a wire electro discharge machine in the building direction.
3：List of Experimental Equipment and Materials:
EOSINT M280 DMLS AM system, Mitutoyo SJ-410 portable surface roughness tester, radical digital Vickers microhardness tester RMHT
4：Experimental Procedures and Operational Workflow:
2 Surface roughness was examined using a surface roughness tester. Microhardness was measured using a Vickers microhardness tester with a 200 g load applied on the vertical plane for a dwell period of 15 s.
5：Data Analysis Methods:
The average surface roughness and microhardness values were calculated for each sample.
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