Effect of Rare Earth Elements on Austenite-Ferrite Phase Transformation Kinetics of Low Carbon Steels

被引：0
|
作者：
Guo F. [1 ,2 ]
Zheng C. [1 ,2 ]
Wang P. [1 ,2 ]
Li D. [1 ,2 ]
机构：
[1] Institute of Metal Research, Chinese Academy of Sciences, Shenyang National Laboratory for Materials Science, Shenyang
[2] School of Materials Science and Engineering, University of Science and Technology of China, Shenyang
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2023年 / 37卷 / 07期
基金：
中国国家自然科学基金;
关键词：
austenite ferrite phase transformation kinetics; low-carbon steels; metallic materials; phase diagram and phase transformation; rare-earth element;
D O I：
10.11901/1005.3093.2022.109
中图分类号：
学科分类号：
摘要：
With the increasing cleanliness of steels in recent years, it has made possible for making micro-alloyed steels with rare earth elements. It is found that the addition of rare earths has a significant effect on the solid-state phase transformation behavior of steels, especially for low-carbon low-alloy steels. The effectiveness in modifying the inclusions and inducing nucleation by RE addition has been studied intensively and approved substantially. Whereas, the micro-alloying effect of RE on the ferrite phase transformation of steel is still unclear. The effect of rare earth elements (RE) on austenite-ferrite transformation temperature during continuous cooling, and the isothermal transformation kinetics of Fe-C alloys and Fe-C-Si-Mn low carbon steels has been investigated in this article. It is found that a tiny amount of RE addition can reduce the starting point temperature of proeutectoid ferrite during continuous cooling. Additionally, the addition of RE also changes the ferrite transformation kinetics in the isothermal process: for Fe-C-(RE) alloys, the addition of RE slows down the transformation rate during the whole transformation process due to the pinning carbon diffusion effect; For Fe-C-Si-Mn alloys, RE elements can play a double role of pinning carbon diffusion and changing grain boundary energy, and then prolong the incubation period and decreases the rate of phase transformation during the initial stage, while increase the phase transformation rate during the middle and late of phase transformation. © 2023 Chinese Journal of Materials Research. All rights reserved.
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页码：495 / 501
页数：6
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