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- Title
Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance.
- Authors
Calandri, Michele; Manfredi, Diego; Calignano, Flaviana; Ambrosio, Elisa Paola; Biamino, Sara; Lupoi, Rocco; Ugues, Daniele
- Abstract
The additive manufacturing concept for the production of complex near net shape metal parts is obtaining increasing attention due to the possibility of producing assembled and/or complex parts allowing optimal design and saving time and cost. The possibility to use the free design of Selective Laser Melting (SLM) techniques for the fabrication of complex 3D components using high performing, although difficult to work, materials such as Ni superalloys is really attractive. The particular process conditions that are established during additive manufacturing in SLM leads to microstructures different with respect to those observed in standard cast or wrought analogous material. Therefore, it is usually necessary to apply a post solution treatment, in order to reduce the segregation of heavier elements (in particular Nb) and dissolve the interdendritic precipitates. In this study, the influence of temperature and time of the solution treatment on the microstructure is investigated in order to find the best results in terms of the final oxidation resistance. Oxidation performances of solutioned Inconel 718 fabricated via SLM are reported and discussed. The growth rate of the superficial oxide at the temperature of 850 °C was measured and the long‐term stability of this passivating layer was tested until 908 h. In this paper, the authors show the microstructure of Inconel 718 Ni‐based superalloy produced by Selective Laser Melting (SLM) in the as built condition and its evolution after different solutioning treatment. The final goal of the study is to optimize the solutioning treatment in view of the hot oxidation resistance of the alloy at the temperature of the final application (850 °C). Therefore, the result of a long (908 h) oxidation test at 850 °C of the solutioned material is also reported.
- Subjects
HEAT resistant alloys; OXIDATION; MICROSTRUCTURE
- Publication
Advanced Engineering Materials, 2018, Vol 20, Issue 11, pN.PAG
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.201800351