Fatigue Behavior and Failure Analysis of Ti-6Al-4V Forging with High Oxygen Content

被引：0
|
作者：
Liu, Yunxi [1 ,2 ]
Chen, Wei [1 ]
Li, Zhiqiang [1 ,2 ]
Tang, Bin [3 ]
Yao, Gang [1 ]
机构：
[1] AVIC Mfg Technol Inst, Beijing 100024, Peoples R China
[2] Aviat Key Lab Sci & Technol Plast Forming, Beijing 100024, Peoples R China
[3] Northwestern Polytech Univ, Xian 710072, Peoples R China
来源：
HIGH PERFORMANCE STRUCTURAL MATERIALS | 2018年
关键词：
Ti-6Al-4V alloy; Basal texture; High cycle fatigue; Life distribution; High oxygen content; TITANIUM; VARIABILITY; ALLOY;
D O I：
10.1007/978-981-13-0104-9_47
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure, texture and HCF (high cycle fatigue) behavior of a Ti-6Al-4V forging with 0.20 wt% oxygen were investigated. The material was composed of 80 vol% of equiaxed alpha(p) grains and 20 vol% of transformed beta (beta(T)). Average size of the alpha(p) phase was about 14 mu m. EBSD analysis indicated a weak basal texture with intensity of 2 times random. The forging billet exhibited a good combination of ductility and strength performance and the mechanical properties did not show obvious anisotropy. The fatigue life had a large scatter and the mean life increased as the stress level decreased. The minimum life and POF = 0.1% life of the samples increased with the decrease of stress level. The difference of the feature of facets at the fatigue crack initiation region is considered to be the main cause of fatigue life scatter. The formation of the faceted area in fatigue crack initiation area results from the nucleation site of fatigue crack located in grain clusters with similar orientation.
引用
收藏
页码：441 / 450
页数：10
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