Mechanical and electrochemical corrosion properties of titanium by laser melting deposition

In this work, samples of pure titanium (TA2) deposited on Ti-6AL-4V substrate using laser melting deposition (LMD) were prepared and microstructure, wear resistance, and corrosion behavior of the deposited material were characterized. The results showed that the microstructure of TA2 has acicular alpha' phases and platelet alpha phases structure due to the effect of rapid cooling of the laser melt pool. The wear types of the deposited TA2 included adhesive and abrasive wear and exhibit good corrosion resistance. Tensile test experiments with 10(-3) s(-1) (0.9 mm/min) and 10(-4) s(-1) (0.09 mm/min) strain rates were carried out in vertical to the laser scanning direction (VL) and parallel to the laser scanning direction (PL) to evaluate the mechanical properties. The tensile results showed that the mechanical properties of the samples in VL are different from those in PL. For specimens of PL, the elongation and the tensile strength were 13% and 510.4 MPa; those were 12.8% and 435.78 MPa in specimens of VL. Johnson-Cook model was used to build sample models to simulate the tensile tests at different rates. According to the tensile loading and stress-strain relation of TA2, the simulation results were consistent with the experimental results. This work demonstrated the potential of fabricating TA2 by LMD and the feasibility of combining experiment and simulation.