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张赛飞,曾卫东,龙雨,李欣,徐建伟.三种组织TC17合金的疲劳裂纹扩展行为研究[J].稀有金属材料与工程(英文),2018,47(12):3741~3747.[Saifei Zhang,Weidong Zeng,Yu Long,Xin Li and Jianwei Xu.Study on the Fatigue Crack Growth of TC17 Titanium Alloy with Three Mcrostructures[J].Rare Metal Materials and Engineering,2018,47(12):3741~3747.]
Study on the Fatigue Crack Growth of TC17 Titanium Alloy with Three Mcrostructures
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Received:April 20, 2017  Revised:June 27, 2017
Key words: TC17 titanium alloy  fatigue crack growth  equiaxed microstructure  basket-waved microstructure  globularized microstructure
Foundation item:凝固技术国家重点实验室(西北工业大学)自主研究课题资助(项目号:153-ZH-2016)
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Saifei Zhang,Weidong Zeng,Yu Long,Xin Li and Jianwei Xu  
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      Three typical microstructures for TC17 titanium alloy, i.e. equiaxed microstructure, basket-waved microstructure and globularized microstructure, are obtained by conventional forging, beta forging and “beta pre-forging+subtransus forging”, and Fatigue crack growth rates of TC17 samples with the three microstructures are tested in order to evaluate the influence of different microstructures. The results reveal a significant dependence of microstructure on fatigue crack growth rate for this material. Basket-waved microstructure has an excellent fatigue crack growth resistance, followed by globularized microstructure, while the equiaxed microstructure shows the poorest propagation resistance. On the basis of fracture mechanics, prediction models for fatigue crack growth life based on Paris equation are developed respectively for the three different microstructures. The models suggest that the propagation life for the large crack in the three microstructure accounts for only a very small proportion of the total fatigue life, hence the control of crack initiation is more important. Superior propagation resistance means a longer critical crack length, which is easily testable in practice.