Abstract
A novel Ti-6.38Al-3.87V-2.43Mo alloy was designed with a cluster formula of 12[Al-Ti12] (V0.75Mo0.25Ti2)+4[Al-Ti12](Al3) by replacing Ti with Mo/V on the basis of the Ti-Al congruent alloy. The effects of laser power and scanning speed on the molten pool size, surface roughness, relative density, microstructure, and micro-hardness of single-track and bulk Ti-6.38Al-3.87V-2.43Mo samples prepared via laser additive manufacturing (LAM) were investigated. The results show that processing parameters significantly affect the formability, microstructure, and micro-hardness of the alloy. With decreasing laser power from 1,900 W to 1,000 W, the relative density is decreased from 99.86% to 90.91% due to the increase of lack-of-fusion; however, with increasing scanning speed, the relative density does not change significantly, but exceeds 99%. In particular, Ti-6.38Al-3.87V-2.43Mo samples of single-track and bulk exhibit a good formability under an input laser power of 1,900 W and a scanning speed of 8 mm·s-1, and display the lowest surface roughness (Ra=13.33 µm) and the highest relative density (99.86%). Besides, the microstructure of LAM Ti-6.38Al-3.87V-2.43Mo alloy coarsens with increasing laser power or decreasing scanning speed due to the greater input energy reducing the cooling rate. The coarsening of the microstructure decreases the microhardness of the alloy.
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References
Banerjee D, Williams J C. Perspectives on titanium science and technology. Acta Mater., 2013, 61(3): 844–879.
Roger R R. An overview on the use of titanium in the aerospace industry. Mater. Sci. Eng. A, 1996, 213: 103–114.
Liu T Y, Liu H Y, Yao Q, et al. Microstructure and mechanical properties of laser additive manufactured novel titanium alloy after heat treatment. China Foundry, 2021, 18(6): 574–580.
Liu T Y, Zhu Z H, Zhang S, et al. Design for Ti-Al-V-Mo-Nb alloys for laser additive manufacturing based on a cluster model and on their microstructure and properties. China Foundry, 2021, 18(4): 424–432.
Azarniya A, Colera X G, Mirzaali M J, et al. Additive manufacturing of Ti-6Al-4V parts through laser metal deposition (LMD): Process, microstructure, and mechanical properties. J. Alloy. Compd., 2019, 804: 163–191.
Zhu Y Y, Tian X J, Li J, et al. Microstructure evolution and layer bands of laser melting deposition Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy. J. Alloy. Compd., 2014, 616: 468–474.
Zhang D Y, Qiu D, Gibson M A, et al. Additive manufacturing of ultrafine-grained high-strength titanium alloys. Nature, 2019, 576(7785): 91–95.
Yu Q, Wang C S, Wang D, et al. Microstructure and properties of Ti-Zr congruent alloy fabricated by laser additive manufacturing. J. Alloy. Compd., 2020, 834: 155087.
Dong C, Wang Z J, Zhang S, et al. Review of structural models for the compositional interpretation of metallic glasses. Int. Mater. Rev., 2019, 65(5): 286–296.
Dong C, Dong D D, Wang Q. Chemical units in solid solutions and alloy composition design. Acta. Metall. Sin., 2018, 54: 293–300.
Dong C, Wang Q, Qiang J B, et al. From clusters to phase diagrams: Composition rules of quasicrystals and bulk metallic glasses. J. Phys. D. Appl. Phys., 2007, 40: R273–R291.
Takeuchi A, Inoue A. Classification of bulk metallic glasses by atomic size difference, heat of mixing and period of constituent elements and its application to characterization of the main alloying element. Mater. Trans., 2005, 46: 2817–2829.
Zhang J, Wang Q, Wang Y M, et al. Effect of heat treatment on the highly corrosion-resistant Cu70Ni27.7Fe2.3 alloy. J. Alloy. Compd., 2010, 505(2): 505–509.
Wang Z R, Qiang J B, Wang Y M, et al. Composition design procedures of Ti-based bulk metallic glasses using the cluster-plus-glue-atom model. Acta Mater., 2016, 111: 366–376.
Jiang B B, Wang Q, Wen D H, et al. Effects of Nb and Zr on structural stabilities of Ti-Mo-Sn-based alloys with low modulus. Mater. Sci. Eng. A, 2017, 687: 1–7.
Wu X H, Liang J, Mei J F, et al. Microstructures of laser-deposited Ti-6Al-4V. Mater. Des., 2004, 25: 137–144.
Yang J J, Han J, Yu H C, et al. Role of molten pool mode on formability, microstructure and mechanical properties of selective laser melted Ti-6Al-4V alloy. Mater. Des., 2016, 110: 558–570.
Thijs L, Verhaeghe F, Craeghs T, et al. A study of the microstructural evolution during selective laser melting of Ti-6Al-4V. Acta Mater., 2010, 58(9): 3303–3312.
Ohnuma I, Enoki H, Ikeda O, et al. Phase equilibria in the Fe-Co binary system. Acta Mater., 2002, 50(2): 379–393.
Enkhtor L, Galbadrakh R, Silonov V. Short-range order and static displacements in polycrystalline Ni-13.1at.%W alloy. Solid. State. Phenom., 2018, 271: 98–105.
Villars P, Calvert L D. Pearson’s handbook of crystallographic data for intermetallic phases. ASM International, 1985.
Jiang B B, Wang Q, Dong C, et al. Exploration of phase structure evolution induced by alloying elements in Ti alloys via a chemical-short-order cluster model. Sci. Rep., 2019, 9: 3404.
Dong D D, Zhang S, Wang Z J, et al. Composition interpretation of binary bulk metallic glasses via principal cluster definition. Mater. Des., 2016, 96: 115–121.
Qian S N, Dong C, Liu T Y, et al. Solute-homogenization model and its experimental verification in Mg-Gd-based alloys. J. Mater. Sci. Technol., 2018, 34: 1132–1141.
Wu H, Zhao Y, Ge P, et al. Effect of β stabilizing elements on the strengthening behavior of titanium α phase. Rare Met. Mater. Eng., 2012, 41(5): 805–810.
Ren Y M, Lin X, Fu X, et al. Microstructure and deformation behavior of Ti-6Al-4V alloy by high-power laser solid forming. Acta Mater., 2017, 132: 82–95.
Bäuerle D. Laser processing and chemistry. Springer, Berlin/New York, 2011.
Mills K C. Recommended values of thermophysical properties for selected commercial alloys. Cambridge, 2002.
Rubenchik A, Wu S, Mitchell S, et al. Direct measurements of temperature-dependent laser absorptivity of metal powders. Appl. Opt., 2015, 54: 7230–7233.
Acknowledgements
This work was supported by the National Key Research and Development Program of China (No. 2016YFB1100103), and the Key Discipline and Major Project of Dalian Science and Technology Innovation Foundation (No. 2020JJ25CY004).
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Chuang Dong Male, Ph. D, Professor. His research interests mainly focus on structural modeling of disordered materials, alloy design, and surface modification. Prof. Dong owned the title of the Outstanding Young Researcher in 1995 and Changjiang Professor in 2005, respectively.
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Liu, Ty., Zhu, Zh., Zhang, S. et al. Effect of processing parameters on formability, microstructure, and micro-hardness of a novel laser additive manufactured Ti-6.38Al-3.87V-2.43Mo alloy. China Foundry 19, 158–168 (2022). https://doi.org/10.1007/s41230-022-1066-6
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DOI: https://doi.org/10.1007/s41230-022-1066-6