Forming process,microstructure,strength and toughness of Ti6Al4V alloy by laser wire-feed additive manufacturing
In this paper,single-pass multi-layer Ti6Al4V alloy specimens were prepared by laser wire-feed additive manufacturing technology.The effects of laser power,scanning speed and wire feeding speed on the microstructure,tensile properties and impact properties of Ti6Al4V alloy were systematic-ally studied.The microstructure of single-pass multi-layer deposition samples is composed of martens-ite α',α bundle and basket-weave microstructure.The increase of laser power increases the β grain size and the decomposition degree of martensite α'.When the laser power increases from 3 000 W to 3 500 W,the tensile strength of the sample decreases by about 4％,the elongation increases by 50％,and the impact toughness increases by about 6％.With increasing wire feeding speed,the average size of the βgrains of the sample increases.As the wire feeding speed increases from 10 mm/s to 30 mm/s,the tensile strength decreases by 2％,the elongation increases by 67％,and the impact toughness increases by 11％.When the scanning speed increases,the lack-of-fusion and residual martensite α'in the sample increases.Compared with the sample with a scanning speed of 4 mm/s,the elongation rate of the sample with a scanning speed of 6 mm/s increases by about 45％,the tensile strength decreases by 2％,and the impact toughness increases by 11％.
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