Abstract
Compressive tests were carried out on different directions of Ti6Al4V prepared by selective laser melting to further study the relationship between α′ martensite size and mechanical properties. Rapid cooling during the selective laser melting process leads to the formation of α′ martensite structure for Ti6Al4V alloy. Results show that the average long axis of α′ martensite near the boundary of prior β phase is smaller, the α′ martensite structures have a long axis average length of approximately 24.5 μm and a short axis length of 1.4 μm, but the long axis of the martensite at the prior β phase grain boundary ranges from 7.8 μm to 23.67 μm, there are differences in martensite size in different regions. The average hardness, compressive strength and strain rate in the horizontal direction are higher than the vertical direction, indicating the mechanical anisotropy.
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