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Effects of the Heterogeneity in the Electron Beam Welded Joint on Mechanical Properties of Ti6Al4V Alloy

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Abstract

The aim of this investigation was to evaluate the effect of microstructure heterogeneity on the tensile and low cycle fatigue properties of electron beam welded (EBW) Ti6Al4V sheets. To achieve this goal, the tensile and low cycle fatigue property in the EBW joints and base metal (BM) specimens is compared. During the tensile testing, digital image correlation technology was used to measure the plastic strain field evolution within the specimens. The experimental results showed that the tensile ductility and low cycle fatigue strength of EBW joints are lower than that of BM specimens, mainly because of the effect of microstructure heterogeneity of the welded joint. Moreover, the EBW joints exhibit the cyclic hardening behavior during low fatigue process, while BM specimens exhibit the cyclic softening behavior. Compared with the BM specimens with uniform microstructure, the heterogeneity of microstructure in the EBW joint is found to decrease the mechanical properties of welded joint.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 50875200 and 51275391), the Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20100201110065 and 20090201120014), the Natural Science Foundation of the Shanxi Province (Grant No. 2011JM6008) and the Fundamental Research Funds from the Central University of China.

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  1. State Key Laboratory of Mechanical Behavior for Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    Jing Liu, Xiao-Long Gao, Lin-Jie Zhang & Jian-Xun Zhang

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  1. Jing Liu
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Correspondence to Jing Liu.

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Liu, J., Gao, XL., Zhang, LJ. et al. Effects of the Heterogeneity in the Electron Beam Welded Joint on Mechanical Properties of Ti6Al4V Alloy. J. of Materi Eng and Perform 24, 319–328 (2015). https://doi.org/10.1007/s11665-014-1251-x

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  • DOI: https://doi.org/10.1007/s11665-014-1251-x

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