Effect of lattice disregistry on the heterogeneous nucleation catalysis of liquid steel
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摘要: 對鋼液凝固溫度下各種化合物基底與鋼液凝固形核相(δ-Fe和γ-Fe)的二維錯配度進行了計算,并對點陣錯配度與鋼液非均質形核觸媒效用的關系進行了分析和討論.結果表明:基底與形核相的錯配度δ越小,越有利于非均質形核.凝固過冷度的對數與基底和形核相的二維錯配度近似呈線性關系.基底與形核相的錯配度δ<8%,非均質形核效用顯著.Abstract: Planar disregistries between various substrates and nucleated phases during liquid steel solidification were calculated. The relation between lattice disregistry and heterogeneous nucleation catalysis of liquid steel was analyzed. The results show that the smaller the disregistry is, the more effective the substrate is for promoting nucleation. The logarithm of undercooling is approximately linear with the disregistry between the substrate and the nucleated phase. A substrate is presumed as the highly effective nucleus for promoting nucleation if the disregistry between the substrate and the nucleated phase is lower than 8%.
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Key words:
- liquid steel /
- heterogeneous nucleation /
- disregistry /
- undercooling
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