Abstract
In this study, the solidification microstructure, reconstructed by the method of parent grain crystallographic reconstruction (PGCR), was studied for TC4 titanium alloy welded joint. The investigation focused on the impact of the solidification microstructure on the phase transformation process and grain boundary transformation mechanism in various regions of the welded joint. Additionally, the study explored the influence of phase transformation and grain boundary transformation on the mechanical properties of the joint. The results showed that the microstructure of fusion zone (FZ) and heat affected zone (HAZ) in the joint was transformed from equiaxed primary α and α + β lamellae to complete primary β grains, and then α' phase was precipitated in the primary β grain, and the residual phases were transformed into secondary α phases. The transformation process from β to α' was controlled by the Burgers orientation relationship (OR), mainly from the primary β of {101}{111} crystal plane groups to the α' and α phases of {1000} {11-20} crystal plane groups. The sizes of primary β and α1' phase were both increased with the rise in heat absorption in different regions, and the tensile strength of the joint was at a considerable level than that of the Base, reaching 100.87 pct. Due to the increase of dislocation density and the quantities of high angle grain boundary, the impact energy of the joint reached 31.19 J, which was larger than the 18.51 J of the Base.
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Acknowledgments
This research was supported by Jiangsu Province Science and Technology Achievement Transformation Fund (BA2020068), Zhejiang Key Project of Research and Development Plan (2021C01085), Key Technology Research Project of Beilun District Ningbo City (2021BLG005), and National Natural Science Foundation of China (52005320).
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**hong Du contributed toward conceptualization, investigation, data curation, and writing– original draft. Hongbing Liu contributed toward funding acquisition, writing – review & editing, and supervision. Fei Wang contributed toward writing -review & editing, supervision, and conceptualization. Wen Bao contributed toward writing – review & editing. Huan Li contributed toward writing -review & editing, supervision, project administration, and funding acquisition.
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Du, J., Liu, H., Wang, F. et al. Solidification Microstructure Reconstruction and Its Effects on Phase Transformation, Grain Boundary Transformation Mechanism, and Mechanical Properties of TC4 Alloy Welded Joint. Metall Mater Trans A 55, 1193–1206 (2024). https://doi.org/10.1007/s11661-024-07317-8
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DOI: https://doi.org/10.1007/s11661-024-07317-8