Creep Behavior of UFG CP Ti at Room Temperature

3rd Annual International Workshop on Materials Science and Engineering

Luo, Lei^1 ; Zhao, Xicheng^1 ; Liu, Xiaoyan^1 ; Yang, Xirong^1

College of Metallurgical Engineering, Xi'An University of Architecture and Technology, Xi'an

710055, China^1

关键词: Commercial purity titanium;    Creep deformation mechanisms;    Dislocation creep;    Refining process;    Steady state creep rate;    Stress exponents;    Ultimate tensile strength;    Ultra-fine-grained;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/250/1/012062/pdf
DOI  :  10.1088/1757-899X/250/1/012062

来源: IOP

【 摘 要 】

Ultra-fine grained commercial purity titanium (UFG CP Ti) is processed by Composite refining process (Equal channel angular pressing (ECAP), cold rolling and rotary swaging) at room temperature. The grain size is refined from 19 μm to 180 nm, and the ultimate tensile strength increase to 870 MPa. Creep tests were carried out on Ultra-fine grained commercial purity titanium with the stresses of 640, 660, 680, 700, 720, 740, 760 MPa at room temperature. Steady state creep rate and stress exponent n at various stresses were calculated for Ultra-fine grained commercial purity titanium, and creep deformation mechanism was also investigated. (With the rise of stress, the steady creep rate increases while the creep time decrease). The steady state creep rate reached maximum 1.416×10-6s-1(under) stress of 760 MPa. The stress exponent is 17.3 when the stress was 640 ∼ 700MPa, while the stress exponent is 55.7 when the stress was 700 ∼ 760MPa, UFG CP Ti shows good creep property at room temperature. The creep deformation mechanism of UFG CP Ti is the dislocation creep.