稀土元素对低碳钢中奥氏体-铁素体相变动力学的影响

doi:10.11901/1005.3093.2022.109

材料研究学报

2023, Vol. 37

Issue (7): 495-501 DOI: 10.11901/1005.3093.2022.109

研究论文

本期目录 | 过刊浏览

稀土元素对低碳钢中奥氏体-铁素体相变动力学的影响

郭飞¹^,², 郑成武¹^,², 王培¹^,²(

), 李殿中¹^,²

^1.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

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

GUO Fei¹^,², ZHENG Chengwu¹^,², WANG Pei¹^,²(

), LI Dianzhong¹^,²

^1.Institute of Metal Research, Chinese Academy of Sciences; Shenyang National Laboratory for Materials Science, Shenyang, 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

引用本文:

郭飞, 郑成武, 王培, 李殿中. 稀土元素对低碳钢中奥氏体-铁素体相变动力学的影响[J]. 材料研究学报, 2023, 37(7): 495-501.
Fei GUO, Chengwu ZHENG, Pei WANG, Dianzhong LI. Effect of Rare Earth Elements on Austenite-Ferrite Phase Transformation Kinetics of Low Carbon Steels[J]. Chinese Journal of Materials Research, 2023, 37(7): 495-501.

全文: PDF(15251 KB) HTML

摘要:

使用热膨胀仪等手段研究了稀土对Fe-C和Fe-C-Si-Mn低碳钢连续冷却过程奥氏体-铁素体相变温度和等温过程相变动力学的影响。结果表明，添加微量的RE元素可显著降低连续冷却过程中先共析铁素体相变的开始点温度。同时，添加微量稀土还能改变等温过程中的铁素体相变动力学：RE元素通过抑制碳扩散减缓了Fe-C-(RE)合金整个相变过程的相变速率；而对于Fe-C-Si-Mn合金，RE通过抑制C元素扩散和改变晶界能的双重作用，使其相变孕育期延长和相变初始阶段速率降低，但是提高了相变中后期的速率。

关键词 ：金属材料, 相图与相变, 低碳钢, 奥氏体-铁素体相变动力学, 稀土元素

Abstract：

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.

Key words： metallic materials phase diagram and phase transformation low-carbon steels austenite ferrite phase transformation kinetics rare-earth element

收稿日期: 2022-02-23

ZTFLH:

TG142

基金资助:国家自然科学基金(52031013)

通讯作者: 王培，研究员，pwang@imr.ac.cn,研究方向为材料微观组织与宏观力学性能关系

Corresponding author: WANG Pei, Tel: (024)23970106, E-mail: pwang@imr.ac.cn

作者简介: 郭飞，男，1992年生，博士生

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表1 Fe-C-(RE)和Fe-C-Si-Mn-(RE)合金试样的化学成分

图1 实验用钢的初始显微组织

图2 基于热膨胀实验的热处理工艺示意图

图3 固溶RE对Fe-C合金和Fe-C-Si-Mn低碳钢中先共析铁素体相变开始温度点的影响

图4 Fe-C-(RE)合金铁素体等温相变动力学曲线和铁素体相变速率与时间的关系

图5 Fe-C-Si-Mn-(RE)合金铁素体等温相变动力学曲线和铁素体相变速率与时间的关系

图6 等温相变不同时间后试样的显微组织

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