Abstract
In this paper, the microstructure evolution of TC17 titanium alloy prepared by laser stereo forming (LSF) was investigated. Forged TC17 plate was selected as the base material, and TC17 titanium alloy spherical powder with the size of 50-150 μm was the candidate cladding material. The microstructure in deposited TC17 titanium alloy was consisted of three parts, namely fine grains at the bottom of the deposition area, coarse β columnar crystals at the middle, while coarse β columnar crystals or equiaxed crystals at the top. The microstructure is significantly affected by the thermal cycle history during the LSF process. At different locations of the deposited samples, the composition, morphology, size and volume fraction of the phases in the grains are discrepant, as the metastable β phase and the acicular martensite (α′) structure were obtained at the bottom and in the middle, respectively. Due to thermal cycle during multi-layer deposition, the metastable β phase will gradually evolved into α + β phases. As the subsequent deposition process continued, the temperature in the middle of the deposition area decreased below the transformation point, and α′ is decomposed into α + β. The precipitated α phase gradually grew up under the action of thermal cycle. Meanwhile, the fine secondary α phase precipitated from the metastable β phase, and finally the coarser α lath and inter lath were obtained β structure.
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Acknowledgments
The authors would like to express their sincere thanks for the research grants supported by the National Natural Science Foundation of China (Grant No.51805002), Project supported by the Research Fund of Key Laboratory of advanced metal material green preparation and surface technology (AHUT), Ministry of Education, China (Grant No.GFST2020KF03).
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Liang, S., Li, J., Zhang, Q. et al. Microstructural Evolution in the TC17 Titanium Alloy Processed During Laser Stereo Forming. J. of Materi Eng and Perform 30, 2967–2976 (2021). https://doi.org/10.1007/s11665-021-05550-5
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DOI: https://doi.org/10.1007/s11665-021-05550-5