Microstructure and mechanical properties of TC4/TA2 honeycomb structure fabricated by Selective Laser Melting(SLM)

A TC4/TA2 honeycomb structure was fabricated using selective laser melting. The study primarily investigates the impact of process parameters on the mechanical properties of as-built TC4 and TA2, as well as the correlation between microstructure and mechanical properties in as-built TC4/TA2. The resulting composite displays a heterogeneous structure of acicular α′ and columnar β grains, and exhibits superior mechanical properties with a maximum tensile strength of 1081 MPa and an average elongation of approximately 14%. These outstanding mechanical properties are attributed to the strengthening effect of acicular α′ martensite and synergistic effect between dissimilar materials. The anisotropy of the mechanical properties of heat-treated TC4/TA2 decreased, which is attributed to the transformation of the columnar grains to the basket-waving structure and equiaxed structure.