Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Casting and Solidification
Comparison between the Capability of MgO and that of TiN on the Heterogeneous Nucleation of δ-Fe Containing 0.05 mass%C
Takashi MorohoshiTooru Matsumiya
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2019 Volume 105 Issue 8 Pages 803-811

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Abstract

A tablet made of one of either TiN, MgO or α-Al2O3 was immersed in molten steel containing 0.05 mass%C and undercooling for nucleation of δ-Fe was measured. Undercooling was smaller in order of TiN, MgO, α-Al2O3. Namely undercooling in case of a TiN tablet immersion was the smallest, no more than 2.1 K. This result shows that although disregistry between δ-Fe and MgO is nearly equal to that between δ-Fe and TiN, MgO is obviously less effective heterogeneous nucleation site for δ-Fe than TiN. Chemical term and structural term which were parts of interfacial energies acting for nucleation of δ-Fe were calculated. It is concluded that because chemical term, (γCLch–γCSch)/γSL, in case of MgO is much smaller than that in case of TiN, MgO is less effective than TiN.

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© 2019 The Iron and Steel Institute of Japan
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