CATALYSIS ON HETEROGENEOUS NUCLEATION OF SOLID COMPOUNDS IN LIQUID STEEL

Acta Metall Sin

2009, Vol. 45

Issue (12): 1441-1445 DOI:

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CATALYSIS ON HETEROGENEOUS NUCLEATION OF SOLID COMPOUNDS IN LIQUID STEEL

PAN Ning¹; SONG Bo¹; ZHAI Qijie²

1.School of Metallurgical and Ecological Engineering; University of Science and Technology Beijing; Beijing 100083
2. School of Materials Science and Engineering; Shanghai University; Shanghai 200072

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PAN Ning SONG Bo ZHAI Qijie. CATALYSIS ON HETEROGENEOUS NUCLEATION OF SOLID COMPOUNDS IN LIQUID STEEL. Acta Metall Sin, 2009, 45(12): 1441-1445.

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Abstract

Solid compounds added into liquid steel can be utilized as substrates for primary ferrite phase or primary austenite phase nucleation during solidification. The effect of solid compounds promoting heterogeneous nucleation can be interpreted as an electrostatic effect between substrates and nucleated phases, with heterogeneous nucleation being considered as caused by the free energy change due to the redistribution of free electrons at the interface of substrate and nucleated phase. In order to evaluate the electrostatic effect, Yu’s empirical electron theory was introduced. With concepts of lattice electron and atomic state hybridization brought forward by Yu, the bond length difference method was applied to calculate valence electron structures of substrates and nucleated phases. The electrostatic effect was quantified as a electron transfer rate at the interface of substrate and nucleated phase. Parameter Δρ was proposed to represent the electron transfer rate. In this study,23 compounds commonly found in liuid steel were selected as the substrates, along with δ–Fe and γ–Fas the nucleatd phases. The valence electron structures of sbstrates and nucleatephases were calculated on the basis of crystal structure data obtained by experimnts. Parameter Δρ between each substrate and δ–Fe/ γ–Fe was calculated from the valence eectron structures. The results show ha, as the parameter Δρ increases, the work of heterogeneous nucleation derived from experimental data decreases; the larger Δρ is, the more effective the substrate is for promoting nucleatio.

Key words: electrostatic effect empirical electron theory heterogeneous nucleaton liquid steel

Received: 25 May 2009

ZTFLH:

TG111.4

Fund:

Supported by National Natural Science Foundation of China (No.50734008)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I12/1441

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