亚快速凝固高强度微合金钢再加热和冷却过程中的奥氏体生长和贝氏体转变动力学研究

王万林; 王兰坤; 吕培生

doi:10.1007/s12613-022-2548-7

Volume 30 Issue 2

Feb. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(2): 354-364

Wanlin Wang, Lankun Wang, and Peisheng Lyu, Kinetics of austenite growth and bainite transformation during reheating and cooling treatments of high strength microalloyed steel produced by sub-rapid solidification, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 354-364. https://doi.org/10.1007/s12613-022-2548-7

Cite this article as:

Wanlin Wang, Lankun Wang, and Peisheng Lyu, Kinetics of austenite growth and bainite transformation during reheating and cooling treatments of high strength microalloyed steel produced by sub-rapid solidification, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 354-364. https://doi.org/10.1007/s12613-022-2548-7

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研究论文

亚快速凝固高强度微合金钢再加热和冷却过程中的奥氏体生长和贝氏体转变动力学研究

1)
中南大学冶金与环境学院, 长沙 410083, 中国
2)
中南大学国家清洁冶金国际研究中心, 长沙 410083, 中国

通讯作者:
吕培生 E-mail: Lyu.peisheng@csu.edu.cn

文章亮点

(1) 研究了亚快速凝固微合金钢再加热过程中析出相对奥氏体长大的影响。

(2) 建立了基于亚快速凝固微合金钢的奥氏体等温长大动力学模型。

(3) 探究了亚快速凝固微合金钢在冷却过程中贝氏体板条生长动力学。

中文摘要

首先，采用薄带连铸热模拟技术制备了具有亚快速凝固特征的高强微合金钢样品。然后利用共聚焦激光扫描显微镜(CLSM)原位观察了样品在再加热和冷却过程中奥氏体晶粒等温长大过程和后续的贝氏体转变过程。结果表明，亚快速凝固微合金钢中的奥氏体长大过程与再加热温度关系紧密；在高温区(1000℃以上)和低温区(1000℃以下)，奥氏体晶粒生长活化能分别为538.0 kJ/mol和693.2 kJ/mol。并据此建立了基于亚快速凝固微合金钢的奥氏体等温长大动力学模型，经过验证，该模型能很好地预测奥氏体晶粒在保温过程的尺寸变化规律。研究还发现，在较低温度下保温时生成的细小且弥散的析出相能够有效地阻碍奥氏体晶粒生长。此外，还原位观察了不同保温温度下（保温时间1800s）的亚快速凝固微合金钢在冷却过程中的贝氏体相变行为。研究了不同形核位置和不同原奥晶粒尺寸对贝氏体板条生长的影响。结果表明，贝氏体板条的生长速率不仅与成核位置有关，而且与原奥尺寸密切相关。

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Research Article

Kinetics of austenite growth and bainite transformation during reheating and cooling treatments of high strength microalloyed steel produced by sub-rapid solidification

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Abstract

Abstract

First, strip cast samples of high strength microalloyed steel with sub-rapid solidification characteristics were prepared by simulated strip casting technique. Next, the isothermal growth of austenite grain during the reheating treatment of strip casts was observed in situ through confocal laser scanning microscope (CLSM). The results indicated that the time exponent of grains growth suddenly rise when the isothermal temperature higher than 1000°C. And the activation energy for austenite grain growth were calculated to be 538.0 kJ/mol in the high temperature region (above 1000°C) and 693.2 kJ/mol in the low temperature region (below 1000°C), respectively. Then, the kinetics model of austenite isothermal growth was established, which can predict the austenite grain size during isothermal hold very well. Besides, high density of second phase particles with small size was found during the isothermal hold at the low temperature region, leading to the refinement of austenite grain. After isothermal hold at different temperature for 1800 s, the bainite transformation in microalloyed steel strip was also observed in situ during the continuous cooling process. And growth rates of bainite plates with different nucleation positions and different prior austenite grain size (PAGS) were calculated. It was indicated that the growth rate of the bainite plate is not only related to the nucleation position but also to the PAGS.
- microalloyed steel;
- strip casting;
- precipitation;
- austenite growth;
- bainite transformation

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