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VERSION:2.0
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 12
SUMMARY:Evaluation of non-metallic inclusions in Inconel 718 produced by conventional production and by additive manufacturing
DESCRIPTION:Evaluation of non-metallic inclusions in Inconel 718 produced by conventional production and by additive manufacturing
A. Karasev, V. Trollbäck, L. Koort, Ch. Hulme

It is well known that non-metallic inclusions (NMIs), which are formed during steelmaking processes, can significantly effect on the final properties of steels and alloys. Therefore, it is important to investigate the inclusion characteristics (such as composition, morphology, size and number) in steels and alloys for comparison and optimization of production processes and improvement of product quality.  
This study focused on evaluation and comparison of main characteristics of NMIs in nickel-based alloy Inconel 718 produced by a conventional production route and by additive manufacturing. Since the common two-dimensional investigations of NMIs on polished metal samples has a number of shortcomings, three-dimensional investigations of NMIs on a film filter and on the metal sample surface after a soft electrolytic extraction were carried out by using scanning electron microscopy equipped with energy-dispersive spectroscopy. 
It was found, that most inclusions have similar compositions in both samples, However, significant differences were detected in the morphology, size ranges and numbers of the observed inclusions. For instance, the sizes of Nb,Ti-C carbides and Ti,Nb-N nitrides in metal sample produced by additive manufacturing are about 6 and 3 times smaller compared to the conventionally produced sample, respectively. Moreover, the number of inclusions observed in the additive manufactured sample is drastically larger than that in the conventionally produced sample. This is explained by the much higher solidification rate of metal melt in the additive manufacturing process. It was concluded that the electrolytic extraction method with subsequent   investigations in the scanning electron microscope can help to determine some significant quantitative differences of NMI characteristics in Inconel 718 samples produced by different production methods.

Key words: steelmaking, additive manufacturing, Inconel 718, non-metallic inclusions, electrolytic extraction.
CLASS:PUBLIC
DTSTART:20230614T153000
DTEND:20230614T155000
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