Abstract
Ti-6Al-4V specimens were fabricated by selective laser melting (SLM) to study the effect of thermal treatment on the phase transformation, elemental diffusion, microstructure, and mechanical properties. The results show that vanadium enriches around the boundary of α phases with increasing annealing temperature to 973 K, and α′ phases transform into α+β at 973 K. The typical α′ martensite microstructure transforms to fine-scale equiaxed microstructure at 973 K and the equiaxed microstructure significantly coarsens with increasing annealing temperature to 1273 K. The SLM Ti-6Al-4V alloy annealed at 973 K exhibits a well-balanced combination of strength and ductility ((1305±25) MPa and (37±3) %, respectively).
摘要
利用激光选区熔化技术(SLM)制备 Ti-6Al-4V 合金,并研究退火处理对该合金的相转变、元素扩散、显微组织结构以及力学性能的影响。结果表明,随着退火温度的升高,钒元素富集在 α′相并且α′相在973 K 转变为 α+β双相组织。在973 K,α′相所形成的马氏体组织转变为细小等轴显微组织,且该等轴组织随温度的升高发生显著粗化。经过973 K 退火的SLM Ti-6Al-4V 合金表现出良好且均衡的强度和延展性,分别为(1305±25) MPa,(37±3)%。
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WANG Pei provided the concept and edited the draft of manuscript. The overarching research goals were developed by J. ECKERT, S. SCUDINO, and K. G. PRASHANTH. CHEN Feng-hua and S. PILZ analyzed the calculated results. The initial draft of the manuscript was written by WANG Pei and K.G. PRASHANTH. All authors replied to reviewers’ comments and revised the final version.
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WANG Pei, CHEN Feng-hua, J. ECKERT, S. PILZ, S. SCUDINO, and K. G. PRASHANTH declare that they have no conflict of interest.
Foundation item: Project (2020A1515110869) supported by Guangdong Basic and Applied Basic Research Foundation, China; Project(GJHZ20190822095418365) supported by Shenzhen International Cooperation Research, China; Project(51775351) supported by the National Natural Science Foundation of China; Project(2019011) supported by the NTUT-SZU Joint Research Program, China; Project(2019040) supported by the Natural Science Foundation of SZU, China; Project(ASTRA6-6) supported by the European Regional Development Fund, European Union
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Wang, P., Chen, Fh., Eckert, J. et al. Microstructural evolution and mechanical properties of selective laser melted Ti-6Al-4V induced by annealing treatment. J. Cent. South Univ. 28, 1068–1077 (2021). https://doi.org/10.1007/s11771-021-4680-3
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DOI: https://doi.org/10.1007/s11771-021-4680-3