固态化合物对钢液非均质形核的触媒作用

金属学报

2009, Vol. 45

Issue (12): 1441-1445

论文

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固态化合物对钢液非均质形核的触媒作用

潘宁¹;宋波¹;翟启杰²

1.北京科技大学冶金与生态工程学院; 北京 100083
2.上海大学材料科学与工程学院; 上海 200072

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

引用本文:

潘宁宋波翟启杰. 固态化合物对钢液非均质形核的触媒作用[J]. 金属学报, 2009, 45(12): 1441-1445.
, , . CATALYSIS ON HETEROGENEOUS NUCLEATION OF SOLID COMPOUNDS IN LIQUID STEEL[J]. Acta Metall Sin, 2009, 45(12): 1441-1445.

全文: PDF(474 KB)

摘要:

对钢液中各种固态化合物基底与形核相(δ-Fe和γ-Fe)的价电子结构进行了计算, 基于静电作用理论和经验电子理论提出了基底和形核相之间的特征参量
Δρ, 并对Δρ与钢液非均质形核触媒作用的关系进行了分析和讨论.结果表明: 基底和形核相之间的特征参量Δρ越大, 非均质形核作用越好.

关键词 ：静电作用, 经验电子理论, 非均质形核, 钢液

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

收稿日期: 2009-05-25

ZTFLH:

TG111.4

基金资助:

国家自然科学基金资助项目50734008

作者简介: 潘宁, 男, 1980年生, 博士生

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