抄録
The condition of implant placement varies for each patient. In addition, the implant body is placed not only vertically against the biting force but also at various angles. Fracture loading reduces as the tilt angle increases. It has been reported that an implant body tilted by 45° fractured at one-tenth of the vertical compression stress.It has also been reported that the bending strength of Ti-6Al-4V alloy decreased with a tilt angle of 30°. The objective of this study was to evaluate the mechanical properties (proof stress, strain and hardness) of Ti-6Al-4V alloy subjected to heat treatment at 515, 535, and 555℃ and different heating times and cooling methods.
Regarding heating time, the highest proof stress was achieved at 90 min and 535℃. Regarding cooling method, furnace-cooling showed the highest proof stress compared to air-cooling and quenching. The proof stress of the furnace-cooled samples was higher than those of the air-cooled and quenched samples. The proof stress was independent of heating time, and the strain was independent of heat treatment. The hardness was independent of heating time and heating temperature. A faster cooling rate decreased the hardness.
Based on observations of the structure, the α and β phase were not changed by heating.
