| METALS AND METAL MATRIX COMPOSITES |
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| Research Progress on the Regulation of Grain Morphology in the Additive Manufactured Ti-6Al-4V Alloy |
| WANG Liqing1, LING Zihan1, ZHAO Zhanyong1, ZHANG Zhen1, BAI Peikang1,2,*
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1 School of Materials Science and Engineering, North University of China, Taiyuan 030051,China
2 College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China |
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Abstract Additive manufacturing (AM) provides new technology for rapid manufacturing of complex parts, high-performance repair of components and personalized customization of products. For the most widely used Ti-6Al-4V (TC4) alloy, the rapid development of AM provides new driving force for the design, optimization and manufacturing of TC4 alloy and its components. However, most of the AMed TC4 alloys exhibit coarse columnar prior-β-Ti grains through multiple deposition layers by epitaxial growth, which results in significant anisotropy of mechanical properties. Therefore, a lot of research work focus on the regulation of the microstructure and mechanical properties of the AMed TC4 alloy, so as to weaken the anisotropy of mechanical properties and optimize the combination of strength and plasticity. This review paper summarizes the recent results of the regulation of the prior-β-Ti grains morphology and its effect on mechanical properties in the AMed TC4 alloys, mainly including the technology for the columnar to equiaxed grain transformation based on improving prior-β-Ti grain nucleation rate and recrystallization mechanism, corresponding evolution of the microstructure and mechanical properties, as well as the scientific research value and application potential of the mixed microstructure with columnar and equiaxed prior-β-Ti grains. Meanwhile, the advantages and disadvantages of the AM technologies are pointed out, and the future research directions of the AM technology based on optimizing the combination of strength and plasticity are prospected.
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Published: 25 November 2023
Online: 2023-11-21
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| Fund:Fundamental Research Program of Shanxi Province (202203021212150, 20210302123064) and the High-level Talent Fund of North University of China (11013110). |
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2023, Vol. 37 
