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Numerical Simulation and Experimental Investigation on Ti70 Titanium Alloy Electron-Beam-Welded Joint

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Abstract

Electron beam welding combined with temperature field simulation has been carried out on the Ti70 titanium alloy, and the microstructural evolution and mechanical property of welded joint are systematically investigated. Results show that the simulated molten pool is well consistent with the experimental weld morphology. Microstructure analysis demonstrates that the upper part of fusion zone (FZ) consists of columnar crystals. The middle part of FZ is composed of equiaxed grains and β columnar crystals, and the fine martensite α′ presents the interlaced distribution within grains. The heat-affected zone is composed of transformed phase β structure (βt), martensite α′ and residual α phase. The microhardness in FZ is the highest. The maximum tensile strength of welded joint reaches 754.5 MPa, which is close to that of base metal. There are many equiaxed dimples on the joint fracture surface, and it dominantly presents the characteristic of ductile fracture.

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Acknowledgements

This project is supported by the Foundation of College Innovation Center in NUAA (No. 2020CX00610) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), which are gratefully acknowledged.

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Authors and Affiliations

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China

    Donghui Wang, Shaogang Wang & Wen Zhang

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  1. Donghui Wang
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  2. Shaogang Wang
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  3. Wen Zhang
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Correspondence to Shaogang Wang.

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Wang, D., Wang, S. & Zhang, W. Numerical Simulation and Experimental Investigation on Ti70 Titanium Alloy Electron-Beam-Welded Joint. Trans Indian Inst Met 73, 2361–2369 (2020). https://doi.org/10.1007/s12666-020-02040-5

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  • DOI: https://doi.org/10.1007/s12666-020-02040-5

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