Numerical Investigation of Transient Temperature Distribution during Ti-6Al-4V Selective Laser Melting
- 32 Downloads
The transient temperature field in the powder bed has a crucial effect on the quality of parts fabricated using Selective Laser Melting (SLM). In this study, a finite element model is established regarding the variance of temperature-dependent thermal properties and transformation latent heat. The temperature distribution and melt pool dimensions of a laser scan track were obtained by varying multiple parameters (layer thickness, laser power and scan speed). The effects of transition of material state and heat source model are also analyzed in this paper. The finite element simulation results show that an increased laser power and/or decreased scan speed results in an elevated maximum temperature of the powder layer and a larger melt pool size. Furthermore, it is found that the maximum temperature is significantly lowered due to the heat diffusion into the previous sintered zone. The heat source model has to be selected properly according to the element size.
KeywordsSelective Laser Melting transient temperature field process parameters melt pool
Unable to display preview. Download preview PDF.
This research was supported by Key Project of Applied Technology Research and Development Plan of Heilongjiang Province (Grants No. GA18A403).
- Teng C., Pal D., Gong H.J., Stucker B., A two dimensional analytical evaluation of thermal fields during metal laser sintering processes. 25th Annual International Solid Freeform Fabrication Symposium, Austin, USA, 2014: 1145–1157.Google Scholar
- Zeng K., Pal D., Stucker B., A review of thermal analysis methods in Laser Sintering and Selective Laser Melting. 23th Annual International Solid Freeform Fabrication Symposium, Austin, USA, 2012: 796–814.Google Scholar
- Zeng K., Pal D., Patil N., Stucker B., A new dynamic mesh method applied to the simulation of selective laser melting. 24th Annual International Solid Freeform Fabrication Symposium, Austin, USA, 2013: 549–559.Google Scholar
- Gong H.J., Gu H.F., Zeng K., Melt pool characterization for selective laser melting of Ti-6Al-4V pre-alloyed powder. 25th Annual International Solid Freeform Fabrication Symposium, Austin, USA, 2014: 256–267.Google Scholar
- Gu L., Xue Z.M., Zhang Y.H., Analysis of heat source model used in temperature field simulation for laser beam deep penetration welding. Electric Welding Machine, 2004, 34(9): 4–7.Google Scholar