Fatigue life prediction model of Ti-6Al-4V alloy forgings based on forging process parameters

Forging processing parameters have an important impact on the fatigue resistance of metal in the process of plastic forming, which directly threatens the safety and reliability of the metal’s service. Taking Ti-6Al-4V alloy as the research object, this study investigates the effect of processing parameters, including forging temperature and deformation degree on the Young’s modulus, ultimate tensile strength, and reduction of fracture area on the basis of the mechanical property testing of Ti-6Al-4V alloy forgings and obtains the regression equations at the same time. Combined with the existing stress fatigue life prediction formula, the fatigue life prediction based on forging process parameters is realized. Results show that forging temperature and deformation degree have a significant effect on fatigue life. The forging processing parameters of Ti-6Al-4V alloy with optimum fatigue life are as follows: 985 °C–990 °C forging temperature and 46%–50% deformation degree.