High-Cycle Fatigue of Ultra-fine Grained Commercial Purity Titanium by Combined Refining Process

被引：0

作者：

Luo Lei ^{[1
]}

Zhao Xicheng ^{[1
]}

Yang Xirong ^{[1
]}

Liu Xiaoyan ^{[1
]}

机构：

[1] Xian Univ Architecture & Technol, Met Engn Technol Res Ctr Shaanxi Prov, Xian 710055, Shaanxi, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2017年 / 46卷 / 07期

关键词：

combined refining process (ECAP plus CR plus RS); ultra-fine grained commercial purity titanium (UFG CP Ti); high-cycle fatigue; fatigue limit; fractography; BIOMEDICAL TI-6AL-4V ALLOY; MECHANICAL-PROPERTIES; PURE TITANIUM; CP-TI; MICROSTRUCTURE; BEHAVIOR; DEFORMATION; ECAP;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Stress-controlled high-cycle fatigue performance of ultra-fine grained commercial purity titanium (UFG CP Ti) was investigated with a loading frequency of 25 Hz and a stress ratio R=-1 at room temperature. The relation between stress amplitude and cycle numbers to failure was fitted, and the fatigue fracture surface of UFG CP Ti specimen was also investigated. The results show that the fatigue limit of the annealed UFG CP Ti specimen at 200 degrees C for 60 min is 376.5 MPa, which is increased by 56.5 MPa compared with that of the unannealed one. Moreover, the fatigue cracks mainly initiate from the surface of fatigue specimen. The annealed UFG CP Ti specimen exhibits the smaller fatigue striation spacing and lower crack propagation rate than the unannealed one, indicating a higher room temperature fatigue performance.

引用

页码：1929 / 1934

页数：6

共 27 条

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