Nucleation of intragranular ferrite at Ti2O3 particle in low carbon steel
Nucleation of intragranular ferrite at Ti2O3 particle in low carbon steel
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DOI：
10.1016/s1359-6454(99)00114-7
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发表时间：
1999-07-09
期刊：
影响因子：
9.4
通讯作者：
Lee, DN
中科院分区：
文献类型：
--
作者：
Shim, JH;Cho, YW;Lee, DN
对含钛低碳钢中铁素体的晶内形核现象进行了系统的实验研究。含钛低碳钢中细小的针状铁素体组织是由铁素体板在细小分散的Ti2O3颗粒处非均相形核引起的，Ti2O3颗粒在钢中具有热力学稳定性。通过钢- ti2o3扩散结合实验，可以清楚地观察到在钢- ti2o3界面附近形成了局部贫锰区（MDZ）。Ti2O3颗粒周围的MDZ形成被认为是晶内铁素体非均相形核的主要驱动力。同时也证实了MDZ的形成与高温下Mn被Ti2O3相吸收有关。MDZ宽度随结合温度（奥氏体化）的降低而减小，并对针状铁素体在Ti2O3颗粒处的晶内形核能力有较大影响。(C) 1999金属学报Elsevier Science Ltd.出版。版权所有。
Systematic experiments have been performed to study the intragranular nucleation phenomena of ferrite in Ti-bearing low carbon steels. The fine intragranular acicular ferrite structure in Ti-bearing low carbon steels is induced by heterogeneous nucleation of ferrite plates at fine dispersed Ti2O3 particles, which are thermodynamically stable in the steels. From a steel-Ti2O3 diffusion bonding experiment, it is clearly observed that a local Mn-depleted zone (MDZ) has developed in the vicinity of the steel-Ti2O3 interface. The MDZ formation around Ti2O3 particles is believed to be a dominant driving force for the heterogeneous nucleation of intragranular ferrite. It is also confirmed that the development of the MDZ is associated with the absorption of Mn into the Ti2O3 phase at high temperatures. The width of the MDZ decreases with decreasing bonding (austenitizing) temperature and influences greatly the intragranular nucleation ability of acicular ferrite at Ti2O3 particles. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.