2014 Volume 55 Issue 3 Pages 511-516
The objective of this study was to investigate the effects of cryo-treatment on the microstructure, corrosion behavior, and mechanical properties of Ti before and after laser welding. The microstructure was studied by optical microscopy. It was found that the grain size for Ti became smaller after cryo-treatment. Cryo-treatment could also refine and stabilize the crystal lattice structure and distribute precipitate particles throughout the material in the welded metal. Potentiodynamic polarization measurements were employed to investigate the corrosion behavior in an artificial saliva solution. Electrochemical results showed that the laser-welded Ti after cryo-treatment exhibited the most obvious passivation behavior of all the specimens. The mechanical properties of Ti, cryo-treated Ti (C-Ti), laser-welded Ti (W-Ti), and cryo-treated, laser-welded Ti (CW-Ti) were characterized by tensile tests. It was found that the tensile strength and elongation could be improved for Ti and laser-welded Ti by cryo-treatment without impairing its corrosion resistance.