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Effect of heat treatment on microstructure and mechanical properties of laser-deposited Ti65 near-alpha titanium alloy

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Abstract

Ti65 samples without obvious defects were successfully prepared by laser deposition manufacturing (LDM), followed by different heat treatments. The microstructures and mechanical properties of the as-deposited and heat-treated samples were investigated. Results showed that the as-deposited microstructure was lamellar structure with precipitations of spherical S2 silicide, tungsten-rich phase and granular Ti3Sn. After annealing, the microstructure turned into a basket-weave microstructure, the volume fraction of silicide was reduced, the tungsten-rich phase was dissolved and more granular Ti3Sn phases with smaller sizes were distributed at the phase boundaries contributing to the improvement of tensile strength and plasticity. After solid-solution plus aging, a duplex microstructure appeared, intragranular α lath was spheroidized, the volume fraction of silicide was minimal and the Ti3Sn phase disappeared, leading to a greater improvement of plasticity and decreasing of tensile strength. Annealing and solid-solution plus aging both enhanced the microhardness of the laser deposited Ti65 sample.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB1104002) and the Central Guidance on Local Science and Technology Development Fund of Liaoning Province (Grant No. 2022JH6/100100041).

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Authors and Affiliations

  1. School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang, 110136, China

    Bo He, Junfeng Sun & Guang Yang

  2. Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang, 110136, China

    Yuhang Ren & Changfu Li

  3. Shenyang Aircraft Corporation, Shenyang, 110850, Liaoning, China

    Xiaodan Li & Jiaqiang Ni

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  1. Bo He
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  2. Junfeng Sun
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Correspondence to Bo He.

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He, B., Sun, J., Ren, Y. et al. Effect of heat treatment on microstructure and mechanical properties of laser-deposited Ti65 near-alpha titanium alloy. Journal of Materials Research 37, 1464–1474 (2022). https://doi.org/10.1557/s43578-022-00547-9

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