Selective Laser Melting of Maraging Steel Using Synchronized Three-Spot Scanning Strategies

Chung-Wei Cheng*, Wei-You Jhang Jian, Bhargav Prasad Reddy Makala

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The selective laser melting (SLM) process, a kind of metal additive manufacturing method, can produce parts with complex geometries that cannot be easily manufactured using material removal processes. With increasing industrial applications, there are still issues such as part quality and productivity that need to be resolved. In this study, maraging steel parts fabricated by synchronized three-spot scanning strategies, i.e., lateral spatial (LS) and spatial inline (SiL), are firstly presented. The LS and SiL represent the three-spot offset direction is perpendicular and parallel to the scanning direction, respectively. A laboratory SLM machine equipped with a fiber laser and three-spot module is used to fabricate the maraging steel parts with two scanning strategies, i.e., LS and SiL. The influence of these scanning strategies on the surface roughness, relative density, hardness, molten pool shapes, and microstructures are investigated. The relative density (similar to 99.02%) and surface hardness (similar to 34.0 HRC) are experimentally found to be higher than the SiL by the LS scanning strategy.

Original languageEnglish
Article number1905
Number of pages11
Issue number8
StatePublished - Apr 2021


  • selective laser melting
  • laser powder bed fusion
  • multi-spot
  • scanning strategy

Cite this