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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Crystallization kinetics of Al2O3-CaO-SiO2 based oxide inclusions
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Crystallization kinetics of Al2O3-CaO-SiO2 based oxide inclusions

机译：Al2O3-CaO-SiO2基氧化物包裹体的结晶动力学

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摘要

The crystallization of oxide inclusions present in steel affects their deformation juring hot rolling? and as a consequence, the quality of the steel product. To define optimal compositions of these inclusions, the crystallization kinetics were experimentally determined on laboratory prepared mixtures Al2O3-CaO-SiO2-X (with X = MgO, Na2O, CaF2, TiO2, ZrO2). The samples were quenched after an isothermal treatment and then measured by X-ray diffraction and optical and scanning electron microscopy. The corresponding time-temperature-transformation (TTT) curves are drawn. The calculated average ratio T-nose/T-liquidus is 0.86 +/- 0.06. The effect of TiO2 and ZrO2 as nucleating agents was tested in Al2O3-CaO-SiO2-Na2O-CaF2 liquids. Such additions were found to increase both the incubation time and the growth rate, which is diffusion controlled. A Johnson-Mehl-Avrami approach has been applied to samples which precipitate only one crystalline phase with a single-nosed ITT curve but is inappropriate for compositions in which several crystalline phases precipitate or when the TIT curve shape is not single-nosed. The main factors affecting the glass forming ability are the viscosities and the liquidus temperatures of the liquids. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 34]
机译：钢中存在的氧化物夹杂物的结晶会影响其在热轧过程中的变形？结果就是钢材的质量。为了确定这些夹杂物的最佳组成，在实验室制备的混合物Al2O3-CaO-SiO2-X（X = MgO，Na2O，CaF2，TiO2，ZrO2）上实验确定了结晶动力学。在等温处理后将样品淬火，然后通过X射线衍射以及光学和扫描电子显微镜进行测量。绘制了相应的时间-温度-转变（TTT）曲线。计算的T-鼻/ T-液相线的平均比率为0.86 +/- 0.06。在Al2O3-CaO-SiO2-Na2O-CaF2液体中测试了TiO2和ZrO2作为成核剂的作用。发现这种添加增加了孵育时间和生长速度，这是受扩散控制的。 Johnson-Mehl-Avrami方法已应用于仅析出具有单鼻子ITT曲线的一个结晶相的样品，但不适用于其中析出多个结晶相或当TIT曲线形状不是单鼻子的样品。影响玻璃形成能力的主要因素是液体的粘度和液相线温度。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：34]

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