· Aleaciones ligeras ·
Si-Young Sung and Young-Jig Kim
Sungkyunkwan University, Suwon, Korea
67th World Foundry Congress
The alpha-case formation mechanism was elucidated for the titanium
casting. The α-case formation reaction between Ti and Al2O3 mold was
examined in a plasma arc melting furnace. The reaction products were
characterized by electron probe micro-analyzer and transmission electron
microscopy. The α-case generation between Ti and Al2O3 mold was not
able to be explained by the conventional α-case formation mechanism,
which is known to be formed by the interstitials, especially oxygen
dissolved from mold materials. However, from our experimental results
and thermodynamic calculations, it was confirmed that the α-case is
formed not only by an interstitial element but also by substitutional metallic
elements dissolved from mold materials. Our newly established α-case
formation mechanism will surely lead to a variety of significant applications
of the α-case controlled Ti casting.
