000K utf8 1100 2024$c2024-02-29 1500 eng 2050 urn:nbn:de:gbv:27-dbt-20240418-140542-002 2051 10.3390/cryst14030244 3000 Fang, Yindong 3010 Freiberg, Katharina 3010 Galenko, Peter K. 3010 Kolbe, Matthias 3010 Kropotin, Nikolai 3010 Lippmann, Stephanie 3010 Seyring, Martin 3010 Yu, Chu 4000 Crystalline Microstructure, Microsegregations, and Mechanical Properties of Inconel 718 Alloy Samples Processed in Electromagnetic Levitation Facility [Fang, Yindong] 4060 14 Seiten 4209 The solidification of Inconel 718 alloy (IN718) from undercooled liquid is studied. The solidification kinetics is evaluated in melted and undercooled droplets processed using the electromagnetic levitation (EML) technique by the temperature–time profiles and solid/liquid (S/L) interface movement during recalescence. The kinetics is monitored in real time by special pyrometrical measurements and high-speed digital camera. It is shown that the growth velocity of γ -phase (the primary phase in IN718), the final crystalline microstructure (dendritic and grained), and the mechanical properties (microhardness) are strongly dependent on the initial undercooling Δ T at which the samples started to solidify with the originating γ -phase. Particularly, with the increase in undercooling, the secondary dendrite arm spacing decreases from 28 μm to 5 μm. At small and intermediate ranges of undercooling, the solidified droplets have a dendritic crystalline microstructure. At higher undercooling values reached in the experiment, Δ T > 160 K (namely, for samples solidified with Δ T = 170 K and Δ T = 263 K), fine crystalline grains are observed instead of the dendritic structure of solidified drops. Such change in the crystalline morphology is qualitatively consistent with the behavior of crystal growth kinetics which exhibits the change from the power law to linear law at Δ T ≈ 160 K in the velocity–undercooling relationship (measured by the advancement of the recalescence front in solidifying droplets). Study of the local mechanical properties shows that the microhardness increases with the increase in the γ ″ -phase within interdendritic spacing. The obtained data are the basis for testing the theoretical and computational of multicomponent alloy samples. 4950 https://doi.org/10.3390/cryst14030244$xR$3Volltext$534 4950 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20240418-140542-002$xR$3Volltext$534 4961 https://www.db-thueringen.de/receive/dbt_mods_00060258 5051 540 5550 electromagnetic levitation 5550 Inconel 718 5550 phase distribution 5550 sharp interface model