基于N含量调控的Ti微合金钢凝固过程中TiN析出行为研究

doi:10.11901/1005.3093.2024.188

材料研究学报

2024, Vol. 38

Issue (12): 911-921 DOI: 10.11901/1005.3093.2024.188

研究论文

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基于N含量调控的Ti微合金钢凝固过程中TiN析出行为研究

陈瑞洋¹, 裘欣², 丁汉林¹(

), 王子健¹, 项重辰¹

1 苏州大学沙钢钢铁学院苏州 215137
2 苏州城市学院光学与电子信息学院苏州 215104

Study on Precipitation Behavior of TiN Particles during Solidification Process of Ti-microalloyed Steels Based on Control of N Content

CHEN Ruiyang¹, QIU Xin², DING Hanlin¹(

), WANG Zijian¹, XIANG Chongchen¹

1 School of Iron and Steel, Soochow University, Suzhou 215137, China
2 School of Optical and Electronic Information, Suzhou City University, Suzhou 215104, China

引用本文:

陈瑞洋, 裘欣, 丁汉林, 王子健, 项重辰. 基于N含量调控的Ti微合金钢凝固过程中TiN析出行为研究[J]. 材料研究学报, 2024, 38(12): 911-921.
Ruiyang CHEN, Xin QIU, Hanlin DING, Zijian WANG, Chongchen XIANG. Study on Precipitation Behavior of TiN Particles during Solidification Process of Ti-microalloyed Steels Based on Control of N Content[J]. Chinese Journal of Materials Research, 2024, 38(12): 911-921.

全文: PDF(12971 KB) HTML

摘要:

通过实验观察和理论分析，研究了不同N含量Ti微合金钢凝固过程中TiN的析出行为。结果表明：降低N含量，可减少液相析出的粗大TiN夹杂的数量、体积分数并改变其形貌，同时也降低了固相析出TiN粒子的形核驱动力、粒子尺寸及体积分数。对于Ti元素含量一定的Ti微合金钢，调整N含量可有效调控钢中TiN夹杂和TiN粒子的形貌、大小和体积分数。

关键词 ：金属材料, Ti微合金钢, TiN粒子, 凝固偏聚, 析出行为

Abstract：

The precipitation behavior of TiN particles during the solidification process of Ti-microalloyed steels with varying N contents was investigated by experimental observations and theoretical analysis. The results indicate that reducing the N content leads to decrease in the number of coarse TiN inclusions precipitated from the liquid phase and changes in the morphology of TiN inclusions, as well as alterations in the driving force for the precipitation and the size of TiN particles precipitated from the solid phase during solidification. Simultaneously, the decrease in N content contributes to the decrease of the volume fraction of TiN particles precipitated from both the liquid and solid phase. It is concluded that the morphology, size and volume fraction of TiN inclusions and precipitated TiN particles within the steel may be controlled by adjusting the N content of Ti-microalloyed steels with a set Ti content.

Key words： metallic materials Ti-microalloyed steel TiN particles solidification segregation precipitation behavior

收稿日期: 2024-04-25

ZTFLH:

TG142.1-3

基金资助:国家自然科学基金(52174367)

通讯作者: 丁汉林，教授，dinghanlin@suda.edu.cn，研究方向为高性能金属材料开发及强韧化机理

Corresponding author: DING Hanlin, Tel: (0512)67165762, E-mail: dinghanlin@suda.edu.cn

作者简介: 陈瑞洋，男，1999年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.188 或 https://www.cjmr.org/CN/Y2024/V38/I12/911

表1 实验钢的化学成分

图1 实验钢中第二相粒子的分布和尺寸

图2 钢中液相析出第二相粒子的SEM照片和EDS能谱

图3 钢中亚微米TiN粒子的分布、形貌和尺寸

图4 在不同温度下Ti含量和N含量的平衡关系

表2 凝固过程中的参数

图5 平衡凝固过程中固/液界面处固相率与溶质浓度的关系

图6 凝固过程中Ti与N的浓度积与固相率的关系

图7 凝固过程中TiN粒子和TiN夹杂生成的示意图[30]

图8 Ti微合金钢凝固过程中生成的TiN的尺寸

图9 Ti微合金钢凝固过程中液固界面处TiN粒子瞬时析出的体积分数

表3 平衡条件下析出的TiN粒子的体积分数

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