Abstract
A novel α+β titanium alloy with multi-alloying addition was designed based on the cluster formula 12[Al-Ti12](AlTi2)+5[Al-Ti14](AlV12Mo06Nb02) which was derived from Ti-6Al-4V. The nominal composition of this novel alloy was determined as Ti-6.83Al-2.28V-2.14Mo-0.69Nb-6.79Zr. In this study, the novel alloy and Ti-6Al-4V alloy samples were prepared by laser additive manufacturing. The microstructure, micro-hardness, room/high temperature tensile properties of the as-deposited samples were investigated. Compared to Ti-6Al-4V, the novel alloy has much higher room and high temperature (600 °C) tensile strengths, which are 1,427.5 MPa and 642.2 MPa, respectively; however, it has a much lower elongation (3.2%) at room temperature because of the finer microstructure. To improve the elongation of the novel alloy, heat treatment was used. After solution at 960 °C or 970 °C for 1 h followed by air cooling and aging at 550 °C for 4 h followed by air cooling, a unique bi-modal microstructure which contains crab-like primary α and residual β phase is obtained, improving the compression elongation by 80.9% compared to the as-deposited samples. The novel alloy can be used as a high-temperature and high-strength candidate for laser additive manufacturing.
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Acknowledgements
This work was financially supported by the Shenyang Young and Middle-aged Scientific and Technological Innovation Talents Program (RC190490), and the Liaoning Revitalization Talents Program (No. XLYC1808030).
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Tian-yu Liu Male, Ph. D. His research interests mainly focus on titanium alloys design and laser additive manufacturing.
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Liu, Ty., Liu, Hy., Yao, Q. et al. Microstructure and mechanical properties of laser additive manufactured novel titanium alloy after heat treatment. China Foundry 18, 574–580 (2021). https://doi.org/10.1007/s41230-021-1089-4
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DOI: https://doi.org/10.1007/s41230-021-1089-4