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Manufacturing Fe–TiC Composite Powder via Inert Gas Atomization by Forming Reinforcement Phase In Situ
Author(s) -
Perminov Anton,
Bartzsch Gert,
Franke Armin,
Biermann Horst,
Volkova Olena
Publication year - 2021
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202000717
Subject(s) - materials science , eutectic system , composite number , scanning electron microscope , carbide , particle size , powder metallurgy , metallurgy , inert gas , particle (ecology) , metal powder , metal matrix composite , energy dispersive x ray spectroscopy , phase (matter) , composite material , metal , microstructure , chemical engineering , oceanography , engineering , geology , chemistry , organic chemistry
Fe–TiC metal matrix composite powder is manufactured applying vacuum inert gas atomization technique. The TiC reinforcement phase forms in situ within spraying of the Fe‐based molten metal preliminary alloyed with 1 wt% [C] and 4 wt% [Ti]. Alloying strategy, homogenization time, and spraying temperature are varied for three conducted atomization experiments in this study. Medium particle size (d50) lies in a range of 41–55 μm for obtained spherical powders. Scanning electron microscopy (SEM) analysis and Energy‐dispersive X‐ray spectroscopy (EDX) mapping of powder cross‐section samples reveal well‐dispersed submicron TiC precipitates of two different morphologies—primary‐blocky and eutectic‐plate‐shape carbides. The amount of precipitates and their morphology depend on the particle size. Namely, coarser powder particles tend to have more primary carbides that are presumably formed already in liquid droplets. Meanwhile, TiC precipitation in finer particles up to ≈25 μm is completely suppressed due to an extremely high cooling rate. Difficulties of the Fe–Ti–C melt atomization (e.g., formation of a semiliquid slag layer, loss of TiC forming elements, the presence of large precipitates in a powder) are discussed considering the thermodynamic analysis of this system and Fe–TiC remelting experiments conducted on a hot stage microscope.