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RSS FeedsMaterials, Vol. 12, Pages 3839: Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding (Materials)

 
 

22 november 2019 15:03:38

 
Materials, Vol. 12, Pages 3839: Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding (Materials)
 


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.


 
195 viewsCategory: Chemistry, Physics
 
Materials, Vol. 12, Pages 3840: Open-Cell Aluminum Foams by the Sponge Replication Technique (Materials)
Materials, Vol. 12, Pages 3837: Effects of Microwave Sintering Temperature and Holding Time on Mechanical Properties and Microstructure of Si3N4/n-SiC ceramics (Materials)
 
 
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