Non-metallic inclusion and intragranular nucleation of ferrite in Ti-killed C-Mn steel
Non-metallic inclusion and intragranular nucleation of ferrite in Ti-killed C-Mn steel
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DOI：
10.1016/s1359-6454(02)00560-8
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发表时间：
2003-04-02
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：
Byun, JS;Shim, JH;Lee, DN
研究了添加Ti对C-Mn钢γ / α相变中针状铁素体组织发展的影响。对不同Ti浓度热处理试样的光学显微组织进行了表征。利用薄片试样进行了透射电镜分析，研究了非金属夹杂物的物相组成和夹杂物周围化学成分的局部变化。当Ti浓度高于约50 ppm时，可形成针状铁素体主导组织。非金属夹杂物的主要成分由Mn-Si氧化物转变为Ti2O3时，由传统的贝氏体组织转变为互锁针状铁素体组织。在Ti2O3颗粒周围发现了Mn贫区，这可以解释Ti2O3颗粒在晶内形成核的原因。(C) 2003材料学报。Elsevier Science Ltd.出版。版权所有。
The influence of Ti addition on the development of acicular ferrite microstructure during the gamma/alpha transformation in C-Mn steels has been studied. The optical microstructures of the heat-treated specimens with different Ti concentrations were characterized. Transmission electron microscopy analysis with thin foil specimens was carried out to investigate the phase composition of non-metallic inclusions and the local variation of chemical composition around the inclusions. It has been found that an acicular ferrite dominant microstructure could be produced when the Ti concentration is hi-her than about 50 ppm. The transition from the conventional bainitic microstructure to the interlocking acicular ferrite microstructure occurs in response to the change in the main-component of the non-metallic inclusions from Mn-Si oxide to Ti2O3. The Mn depleted zones around Ti2O3 particles were detected, which could explain how the intragranular nucleation is facilitated on Ti2O3 particles. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.