Comparative studies on mechnical behavior between Laser rapid forming TC4 and Forging TC4 alloy

Using MTS universal material testing machine and split Hopkinson bar, quasi static and dynamic compression tests were carried out on laser rapid forming and conventional forging TC4 titanium alloy and the mechanical behavior of TC4 titanium alloy produced by two methods has been studied. The results show that the forging TC4−1# with the equiaxed microstructure exhibits the best plasticity, strength and relative strong strain hardening effectinthe quasi-static and dynamic compression. In the quasi-static compression, the forging TC4−2# with the basket structure and laser rapid forming TC4 with the basket structure show the same mechanical response law: the strength and plasticity are equivalent, and the strain hardening effect is weak. In the dynamic compression, the plasticity of the forging TC4−2# and LRF TC4 is similar,but the dynamic rheological stress of the former is higher than that of the latter. All of the three materials are sensitive materials to the strain-rate, but their strain-rate effects are different. Forging TC4−2# material shows the highest strain rate sensitivity, whereas the LRF TC4 material displays lower sensibility to the strain-rate,and the sensibility of the forging TC4−1# is between the former and the latter.