Influence of Selective Laser Melting Process Parameters on Densification Behavior, Surface Quality and Hardness of 18Ni300 Steel

Abstract:

This study investigated the effect of laser power (P), scan speed (v) and hatch space (h) on densification behavior, surface quality and hardness of 18Ni300 maraging steel fabricated by selective laser melting (SLM). The results indicated that the relative density of the SLMed samples has a shape increase from 73% to 97% with the laser energy density increasing from 0.5 to 2.2 J/mm². The relative density ≥ 99% was achieved at the energy density in the range of 2.2~5.9 J/mm². The optimum process parameters were found to be laser power of 150~200 W, scan speed of 600mm/s and hatch space of 0.105mm. In addition, it was found that the hardness increased initially with the increasing relative density up to relative density of 90% and then little relationship, but finally increase again significantly. This work provides reference for determining process parameters for SLMed maraging steel and the development of 3D printing of die steels.

• Periodical: Key Engineering Materials (Volume 861)
• Pages: 77-82
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.861.77
• Online since: September 2020
• Authors: Gan Li, Cheng Guo, Wen Feng Guo, Hong Xing Lu, Lin Ju Wen, Xiao Gang Hu, Qiang Zhu*
• Keywords: 18Ni300 Steel, Densification, Process Parameters, Selective Laser Melting, Surface Quality

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