High cycle fatigue behavior of Ti-5Al-5Mo-5V-3Cr-1Zr titanium alloy with lamellar microstructure

被引：47

作者：

Huang, Chaowen ^{[1
,2
]}

Zhao, Yongqing ^{[1
,2
]}

Xin, Shewei ^{[1
,2
]}

Tan, Changsheng ^{[3
]}

Zhou, Wei ^{[1
,2
]}

Li, Qian ^{[1
,2
]}

Zeng, Weidong

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China

[3] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 682卷

基金：

中国国家自然科学基金;

关键词：

Ti-55531 titanium alloy; Microstructure; High-cycle fatigue; Crack initiation; Crack propagation; BETA TI ALLOY; CRYSTALLOGRAPHIC ORIENTATION; TENSILE DEFORMATION; FRACTURE-TOUGHNESS; CRACK INITIATION; ALPHA; PHASE; BOUNDARIES; FACETS; GROWTH;

D O I：

10.1016/j.msea.2016.11.014

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

High-cycle fatigue (HCF) damage behavior of Ti-5A1-5Mo-5V-3Cr-1Zr (Ti-55531) titanium alloy with lamellar microstructure (LM) was systematically investigated at room temperature. Results indicate that both grain boundary (GB) a phase and small scale (similar to 10 mu m) heterogeneous microstructure regions (SHMRs) in prior beta grains are weak microstructures in LM. Microcracks nucleate at prior beta GBs caused by fracturing of some GB alpha during HCF loading. Dislocations nucleate and annihilate at alpha/beta interfaces, which promote strain concentration and microcracks initiation at alpha/beta interfaces in SHMRs. A combination of slip and twinning predominate cyclic deformation in alpha lamellae, which leads to nucleation of microcracks at a lamellae in SHMRs. Small cracks grow along alpha/beta interfaces or transfer across a lamellae, and then form relatively long cracks in 13 grain interiors. Such crack initiation and propagation behaviors promote the HCF fracture of the alloy.

引用

页码：107 / 116

页数：10

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