Effect of a modified energy density equation to achieve a more uniform energy input during LPBF for improved repeatability. (May 2022)

• Record Type: Journal Article
• Authors: Dowling, L.; Kennedy, J.; Trimble, D.
• Is Part Of: Journal of manufacturing processes. Volume 77(2022)
• Page Start: 607
• Page End: 615
• Publication Date: 2022-05
• Subjects: Repeatability -- Reproducibility -- Additive manufacturing -- Laser powder bed fusion -- Process parameters; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2022.03.045
• Languages: English
• ISSNs: 1526-6125

Abstract

Abstract: The main priority for additive manufacturing research must be an improvement in process repeatability and reproducibility. This paper proposes a modified energy density equation as a basis for location dependent control of process parameters. This equation was used to adapt the process parameters in laser powder bed fusion of cobalt chrome alloy to achieve a more uniform energy density input across the build. Using this modified equation, the standard deviation of the mechanical properties was reduced by 40%. This improvement in consistency was verified using additional testing using 316L. The reduction in the variation in local mechanical property values was verified to be statistically significant.