Grain growth in zone-refined iron
Grain growth in zone-refined iron
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DOI：
10.1179/cmq.1974.13.1.275
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发表时间：
1974
影响因子：
0.9
通讯作者：
Hsun Hu
中科院分区：
文献类型：
--
作者：
Hsun Hu
本文详细研究了区域精炼铁在550 ~ 850°C温度范围内的等温晶粒长大。的经验增长规律，D = Ktn，服从和时间指数，n，随着温度的增加，从约1/4至1/2。相应地，边界迁移速率方程V = M（μ F）m中的驱动力指数m从3变化到1。在研究的温度范围内，晶粒生长动力学不能由一个单一的热激活过程表示，边界运动似乎是杂质控制。晶粒尺寸和形状分布不是对数正态的，并且在正常晶粒生长期间几乎是不变的。这些结果进行了讨论，并与最近的晶粒生长理论。作者介绍了在550 - 850°C的温度区间内，在加热区中，谷物的弯曲等温线的一种近似研究结果。La loi empirique de crosissance，D = Ktn，est verifiee et l'expanant n augment.
Abstract The results of a detailed study of isothermal grain growth in zone-refined iron in the temperature range 550 to 850°C are presented. The empirical growth law, D = Ktn, is obeyed and the time exponent, n, increases with temperature, from approximately 1/4 to 1/2. Correspondingly, the driving-force exponent, m, in the rate equation for boundary migration, V = M(∆F)m, varies from 3 to 1. Within the temperature range studied, grain-growth kinetics cannot be represented by a single thermally activated process; the boundary motion appears to be impurity-controlled. The grain size and shape distributions are not log-normal and are practically invariant during normal grain growth. These results are discussed and compared with recent grain-growth theories. Resume L'auteur presente les resultats d'une etude approfondie de la croissance isotherme du grain dans le fer de zone fondue pour un intervalle de temperature de 550 a 850°C. La loi empirique de croissance, D = Ktn, est verifiee et l'exposant n augment...