Study on Microstructure and Mechanical Properties of Arc 3D Printing TC4 Titanium Alloy
TC4 titanium alloy block was prepared by using cold metal transfer(CMT)welding technology.The microstructure and mechanical properties of the alloy were investigated.The results indicate that the surface forming of TC4 titanium alloy in pringting state is good.The microstructure of arc 3D printing TC4 titanium alloy sample is coarse columnar grains epitaxially growing from the substrate in vertical direction,which is composed of α and β phases.The area of acicular martensite locates the upper portion of the additional material,basket-weave structure with fine tabular at middle part and the base bonding place is mainly composed of lamellar structure,β phase and a small amount of residual α'phase.The hardness of the prepared forming part is higher than that of the substrate,the hardness of the surface is the highest.The room temperature tensile properties show obvious anisotropy and the tensile strength along the horizontal direction is better,the plasticity along the height direction of additive is better.The room temperature impact toughness has no significant anisotropy,and the impact value Aku2 reaches 70 J/cm2.
arc 3D PrintingTC4 titanium alloymicrostructure characteristicmechanical property
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