Tensile properties and hardness of the as received and heat treated samples were evaluated. Optical and scanning electron microscopy were used to investigate the microstructure of the as received and heat treated Ti6Al4V alloy. The as received sample showed a partial martensitic structure, with columnar grains, however a/ß lamellar structure was observed in the heat treated. External and internal pores, un-melted or semi-melted powder particles and inclusions were observed in direct metal laser sintered (DMLS) Ti6Al4V component. The as received DMLS sample showed high ultimate strength and percentage elongation than the heat treated. A ductile fracture mode was observed from the as received DMLS sample, however cleavage fracture was revealed on heat treated. Heating the DMLS component under vacuum led to internal pore-free component.
Reference:
Chauke, L, Mutombo, K and Kgomo, C. 2014. Characterization of the direct metal laser sintered Ti6Al4V Components. In: 14th Annual International RAPDASA 2013 Conference, SANParks Golden Gate Hotel, Bloemfontein, Pretoria, 29 October - 1 November 2013
Chauke, L., Mutombo, K., & Kgomo, C. (2013). Characterization of the direct metal laser sintered Ti6Al4V Components. http://hdl.handle.net/10204/7244
Chauke, L, K Mutombo, and C Kgomo. "Characterization of the direct metal laser sintered Ti6Al4V Components." (2013): http://hdl.handle.net/10204/7244
Chauke L, Mutombo K, Kgomo C, Characterization of the direct metal laser sintered Ti6Al4V Components; 2013. http://hdl.handle.net/10204/7244 .
