Initiation and propagation behaviors of small fatigue crack in titanium alloy TC4

被引：1

作者：

Zhu L. ^{[1
]}

Hu X.T. ^{[1
]}

Jiang R. ^{[1
]}

Song Y.D. ^{[1
,2
]}

Qu S.D. ^{[3
]}

机构：

[1] Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing

[2] State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing

[3] Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing

来源：

Key Engineering Materials | 2019年 / 795卷

基金：

中国国家自然科学基金;

关键词：

Crack growth; Crack initiation; Small fatigue crack; Surface replica; Titanium alloy TC4;

D O I：

10.4028/www.scientific.net/KEM.795.9

中图分类号：

学科分类号：

摘要：

The initiation and propagation behaviors of small fatigue crack in TC4 were investigated in the present work. Surface replication on the basis of a two-part silicon mixture and confocal laser scanning microscope were used to record and observe the small crack initiation and growth processes at room temperature in air. Results showed that surface cracks initiated from the interfaces between α and β phases. When the crack lengths were below ~200 μm, the crack growth rates exhibited large oscillations and temporary retardations due to the presence of α/β interfaces. The corner crack propagated much faster and might have shielding effect on the surface crack. © 2019 Trans Tech Publications Ltd, Switzerland.

引用

页码：9 / 14

页数：5

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