Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding
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Department of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
2
Department of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(23), 3839; https://doi.org/10.3390/ma12233839
Received: 24 October 2019
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Revised: 18 November 2019
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Accepted: 19 November 2019
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Published: 21 November 2019
(This article belongs to the Collection Additive Manufacturing: Alloy Design and Process Innovations)
A deleterious Laves phase forms in the solidified structure of Inconel 718 (IN718) alloy during laser cladding. However, effective removal methods have not yet been identified. In this study, we first added the IN718 alloy cladding layers with a trace amount of vanadium (V, 0.066 wt.%). Then, we studied the solidification structure of cladding layers using a confocal laser scanning microscope and scanning electron microscopy. The microstructure and Laves phase morphology were investigated. The distribution of niobium (Nb) was observed by experiment as well. We found that V is evenly distributed in dendrites and interdendritic zones. A more refined dendrite structure, reduced second dendrite arm spacing and lower volume fraction of Laves phase were observed in the solidification structure. The results of linear energy-dispersive X-ray spectroscopy (EDS) indicate that the concentration of Nb decreases with an increasing of the distance from the Laves phase. The V-containing sample displayed a relatively slower decreasing tendency. The IN718 alloy sample was harder with the addition of V. In addition, the porosity of the sample decreased compared with the blank sample. The presented findings outline a new method to inhibit the Nb segregation in IN718 alloy during laser cladding, providing reference significance for improving the performance of IN718 alloy samples during actual processing.
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Keywords:
microstructure; element segregation; laves phase; vanadium; laser cladding
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MDPI and ACS Style
Yang, K.; Xie, H.; Sun, C.; Zhao, X.; Li, F. Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding. Materials 2019, 12, 3839. https://doi.org/10.3390/ma12233839
AMA Style
Yang K, Xie H, Sun C, Zhao X, Li F. Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding. Materials. 2019; 12(23):3839. https://doi.org/10.3390/ma12233839
Chicago/Turabian StyleYang, Kun, Hualong Xie, Cong Sun, Xiaofei Zhao, and Fei Li. 2019. "Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding" Materials 12, no. 23: 3839. https://doi.org/10.3390/ma12233839
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