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Linear friction welding of equiaxed Ti17 titanium alloy: Effects of microstructure evolution on tensile and impact properties

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Abstract

Linear friction welding of equiaxed Ti17 titanium alloy with great strength–plasticity matching was carried out in this study and the microstructure evolution, tensile property and impact toughness of this joint were investigated in detail. Results show that α dissolution (α → metastable β transformation) takes place in both thermo-mechanically affected zone (TMAZ) and weld zone (WZ). The metastable β in TMAZ near base metal (BM) is affected by stress during welding, resulting in concentrated orientation and high dislocation density. Dynamic recrystallizations of α and metastable β phases occur in TMAZ near WZ, leading to fine recrystallized α grains and equiaxed recrystallized β grains. Complete α dissolution and total dynamic recrystallization appear in WZ owing to the effect of strong thermomechanical coupling. Above microstructure evolution causes significant work hardening and fine grain strengthening effects, counteracting the weakening effect induced by α dissolution, and resulting in the tensile strength (1250.0 MPa), elongation (12.2%) and impact toughness (28.8 J/cm2) of the joint are higher than those of the BM. In addition, the tensile strength and elongation of the equiaxed Ti17 joint are increased compared to those of bimodal as well as basketweave Ti17 joints.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant no. 52105400) and Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, People’s Republic of China

    Zhenguo Guo, Tiejun Ma, Xi Chen, Xiawei Yang, Wenya Li & Achilles Vairis

  2. Aero Engine Corporation of China Aviation Power Co., Ltd, Xi’an, 710015, Shaanxi, People’s Republic of China

    Tao Chen & Jiantao Wang

  3. Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute, Beijing, 100024, People’s Republic of China

    Jun Tao & Ju Li

  4. Mechanical Engineering Department, University of West Attica, 12241, Athens, Greece

    Achilles Vairis

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  1. Zhenguo Guo
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  5. Xi Chen
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Contributions

ZG contributed to conception, experimental design, carrying out measurements and manuscript composition; TM contributed to conception and experimental design; TC contributed to carrying out measurements; JW contributed to carrying out measurements; XC contributed to carrying out measurements and manuscript composition; XY contributed to carrying out measurements and manuscript composition; JT contributed to manuscript composition; JL contributed to manuscript composition; WL contributed to manuscript composition; AV contributed to manuscript composition.

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Correspondence to Xi Chen or Xiawei Yang.

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Guo, Z., Ma, T., Chen, T. et al. Linear friction welding of equiaxed Ti17 titanium alloy: Effects of microstructure evolution on tensile and impact properties. J Mater Sci 58, 10189–10200 (2023). https://doi.org/10.1007/s10853-023-08666-2

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