Investigation of fatigue crack initiation in Ti-6Al-4V during tensile-tensile fatigue

被引：64

作者：

Ivanova, SG ^{[1
]}

Biederman, RR ^{[1
]}

Sisson, RD ^{[1
]}

机构：

[1] Worcester Polytech Inst, Dept Mech Engn, Mat Sci & Engn Program, Worcester, MA 01609 USA

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2002年 / 11卷 / 02期

关键词：

fatigue crack initiation; fatigue of Ti-6Al-4V; mean stress effects; microstructure;

D O I：

10.1361/105994902770344312

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fatigue crack initiation in Ti-6Al-4V has been investigated in high cycle fatigue (HCF) and low cycle fatigue (LCF) regimes at stress ratio R = 0.1 using the replication technique. In all four tested alpha/beta microstructures, the crack was initiated by fracture of equiaxed alpha grain. Fractured alpha grains are seen on the fracture surface as flat facets with features characteristic of cleavage fracture. In the regime of low stress amplitudes and in the absence of reverse loading, cleavage fracture contributes to crack initiation and early stages of crack growth in Ti-6Al-4V. This mechanism is discussed in relation to the anomalous mean stress fatigue behavior exhibited by this alloy.

引用

页码：226 / 231

页数：6

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