Transactions of Materials and Heat Treatment

Title：Fatigue life analysis and simulation model modification on TC4 titanium alloy forgings

Authors： Fang Xiurong1 Wang Ziliang Yang Jinhui Liu Yan

Unit：

KeyWords： TC4 titanium alloy forgings fatigue life model modification deformation temperature deformation degree

ClassificationCode：TG319

year,vol(issue):pagenumber：2022,47(6):1-8

Abstract：

Influences of deformation temperature and deformation degree for forging on fatigue life of TC4 titanium alloy forgings were studied by physical experiments. Then, the simulation model of fatigue life for TC4 titanium alloy forgings was established and modified by combining finite element with physical experiment, and the simulation model was verified. The results show that compared with the raw materials, the forged TC4 titanium alloy forgings have longer fatigue life, and the forgings obtained by controlling the deformation temperature at α+β phase deformation temperature have the longest fatigue life. At the optimum deformation temperature, when the deformation degree is controlled at about 50%, the fatigue life of forgings is the longest. Considering the influence of forging deformation temperature zone, the forging frequency should be increased as high as possible. Furthermore, the residual stress of forgings is the main factor affecting the accuracy of the simulation model, and the verification shows that the simulation accuracy can be greatly improved if the maximum equivalent residual stress of actual forgings is engaged, which lays the foundation for in\|depth analysis on the influence of forging process parameters on the fatigue life of TC4 titanium alloy forgings.

Funds：

国家自然科学基金面上项目（51775427，52175145）

方秀荣（1971-），女，博士，教授 Email：fangxr098@163.com

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