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http://dx.doi.org/10.4150/KPMI.2022.29.1.8

Joint Interface Observation of V and 17-4PH Stainless Steel Dissimilar Materials Manufactured by Direct Energy Deposition  

Lee, Se-Hwan (Agency for Defense Development)
Kim, Hobeom (Agency for Defense Development)
Kim, Jeoung Han (Department of Materials Science & Engineering, Hanbat National University)
Publication Information
Journal of Powder Materials / v.29, no.1, 2022 , pp. 8-13 More about this Journal
Abstract
In this study, we have prepared a Ti-6Al-4V/V/17-4 PH composite structure via a direct energy deposition process, and analyzed the interfaces using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The joint interfaces comprise two zones, one being a mixed zone in which V and 17-4PH are partially mixed and another being a fusion zone in the 17-4PH region which consists of Fe+FeV. It is observed that the power of the laser used in the deposition process affects the thickness of the mixed zone. When a 210 W laser is used, the thickness of the mixed zone is wider than that obtained using a 150 W laser, and the interface resembles a serrated shape. Moreover, irrespective of the laser power used, the expected σ phase is found to be absent in the V/17-4 PH stainless steel joint; however, many VN precipitates are observed.
Keywords
Direct energy deposition; Ti-6Al-4V; 17-4PH; Vanadium nitride;
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