Investigation of the Influence of Selective Laser Melting Process Parameters on the Microstructure and Mechanical Properties of 18Ni-300 Maraging Steel

Abstract:

The influence of SLM process parameters (i.e. laser power, scanning speed, and hatch spacing) on the microstructure and mechanical properties of 3D printed 18Ni-300 maraging steel was investigated. In experiments on 3D printed scan tracks, better fusion of powder material was achieved in parameter configurations with higher linear energy density (i.e. LED ≥ 375.00 J m^-1). A higher LED indicates that more laser energy is transferred to the powder material, resulting in complete melting of the powder and the creation of a microstructure with less defects. In experiments on fully built samples, higher relative density was achieved when the hatch spacing was increased or the scanning speed was decreased. Fully built samples produced using parameter configuration B-2 (300 W, 700 mm s^-1, 0.10 mm) have higher relative density and ultimate tensile strength as compared to the other parameter configurations.

• Periodical: Key Engineering Materials (Volume 913)
• Pages: 259-264
• DOI: https://doi.org/10.4028/p-2tysi2
• Online since: March 2022
• Authors: Wee King Law, Zi Yang Wu, Kok Cheong Wong, Hao Liang Wang, Zhen Zhong Sun, Chin Seong Lim*
• Keywords: Additive Manufacturing, Maraging Steel, Mechanical Properties, Microstructure, Selective Laser Melting

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DOI: 10.1016/j.phpro.2011.03.033