终冷温度对<strong>Ti-V-Mo</strong>复合微合金钢析出相、组织和硬度的影响

doi:10.11901/1005.3093.2024.340

材料研究学报

2025, Vol. 39

Issue (7): 533-541 DOI: 10.11901/1005.3093.2024.340

研究论文

本期目录 | 过刊浏览

终冷温度对Ti-V-Mo复合微合金钢析出相、组织和硬度的影响

韩杨燚¹^,², 张腾昊¹, 张可¹(

), 赵时雨³, 汪创伟⁴, 余强⁵, 李景辉¹, 孙新军²

^1.安徽工业大学冶金工程学院马鞍山 243032
^2.钢铁研究总院有限公司工程用钢研究院北京 100081
^3.马鞍山钢铁有限公司长材事业部马鞍山 243003
^4.攀钢集团研究院有限公司攀枝花 617000
^5.湖南华菱涟源钢铁有限公司技术中心娄底 411101

Effect of Final Cooling Temperature on Precipitates, Microstructure, and Hardness of Ti-V-Mo Complex Microalloyed Steel

HAN Yangyi¹^,², ZHANG Tenghao¹, ZHANG Ke¹(

), ZHAO Shiyu³, WANG Chuangwei⁴, YU Qiang⁵, LI Jinghui¹, SUN Xinjun²

^1.School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, China
^2.Institute for Tructural Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China
^3.Long Products Business Division, Ma'anshan Iron and Steel Co., Ltd., Ma'anshan 243003, China
^4.Pangang Group Research Institute Co., Ltd., Panzhihua 617000, China
^5.Hunan Hualing Lianyuan Iron and Steel Co., Ltd., Technical Center, Loudi 411101, China

引用本文:

韩杨燚, 张腾昊, 张可, 赵时雨, 汪创伟, 余强, 李景辉, 孙新军. 终冷温度对Ti-V-Mo复合微合金钢析出相、组织和硬度的影响[J]. 材料研究学报, 2025, 39(7): 533-541.
Yangyi HAN, Tenghao ZHANG, Ke ZHANG, Shiyu ZHAO, Chuangwei WANG, Qiang YU, Jinghui LI, Xinjun SUN. Effect of Final Cooling Temperature on Precipitates, Microstructure, and Hardness of Ti-V-Mo Complex Microalloyed Steel[J]. Chinese Journal of Materials Research, 2025, 39(7): 533-541.

全文: PDF(13475 KB) HTML

摘要:

对Ti-V-Mo复合微合金钢进行热模拟实验，先将其加热至1250 ℃，保温180 s后冷却至890 ℃，保温一定时间并进行压缩变形随后冷却至不同的终冷温度，最后水冷至室温。采用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和维氏硬度计等手段对其表征，研究了终冷温度对其析出相、组织和硬度的影响。结果表明，终冷温度为590 ℃时实验钢的组织为粒状贝氏体，终冷温度为630~690 ℃时其组织为多边形铁素体，终冷温度为730 ℃时其组织为铁素体和马氏体。随着终冷温度的提高，钢中铁素体的平均晶粒尺寸由2.7 μm增大到5.6 μm，(Ti, V, Mo)C析出相的平均尺寸由3.45 nm增大到4.71 nm。随着终冷温度由590 ℃提高到730 ℃其硬度升高后保持平稳再极快地降低。终冷温度为630~660 ℃时其硬度最高为485HV，因为铁素体的细晶强化和(Ti, V, Mo)C的沉淀强化趋于饱和。实验钢中铁素体晶粒尺寸改变引起的细晶强化和(Ti, V, Mo)C的析出引起的沉淀强化，是其硬度变化的主要原因。

关键词 ：金属材料, 终冷温度, Ti-V-Mo复合微合金钢, 组织, 析出相, 硬度

Abstract：

A Ti-V-Mo composite microalloyed experimental steel was subjected to series heating-deformation treatment via Gleeble-3800 thermal simulation tester, i.e. firstly it was heated to 1250 ^oC and kept for 180 s, then cooled down to 890 ^oC and kept for a certain period of time; Subsequently, compression and deformation treatments were carried out; Afterwards, it was cooled to different (final cooling) temperatures and finally water-quenched. The effect of final cooling temperature on the precipitates, microstructure transformation, and hardness of the steel was systematically studied using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Vickers hardness tester. The precipitation behavior of carbides (Ti, V, Mo)C and its influence on the variation of microstructure and hardness of the steels quenched at different final cooling temperatures were clarified. The results indicated that the microstructure of the test steels consist of granular bainite at 590 ^oC, polygonal ferrite at temperatures ranging from 630 ^oC to 690 ^oC and a mixture of ferrite and martensite at 730 ^oC. With the increasing final cooling temperature, the average grain size of ferrite increased from 2.7 μm to 5.6 μm, and the average size of (Ti, V, Mo)C precipitates increased from 3.45 nm to 4.71 nm. With the increasing final cooling temperature from 590 ^oC to 730 ^oC, the hardness increased first, then remain stable and then decreased rapidly. For the isothermal final cooling temperature within the range 630~660 ^oC, the hardness was up to 485HV, which was due to the saturation of the fine grain strengthening of ferrite and the precipitation strengthening of (Ti, V, Mo)C. The fine grain strengthening caused by ferrite grain refinement and the precipitation strengthening caused by the precipitation of (Ti, V, Mo)C were dominant factors of hardness change at different final cooling temperatures.

Key words： metallic materials final cooling temperature Ti-V-Mo complex microalloyed steel microstructure precipitation hardness

收稿日期: 2024-08-15

ZTFLH:

TG142.1

基金资助:国家自然科学基金(52474340);安徽省高等学校科学研究项目(2023AH051090)

通讯作者: 张可，副教授，huzhude@yeah.net，研究方向为先进钢铁材料的基础理论与应用开发

Corresponding author: ZHANG Ke, Tel: 18955578155, E-mail: huzhude@yeah.net

作者简介: 韩杨燚，男，1998年，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.340 或 https://www.cjmr.org/CN/Y2025/V39/I7/533

表1 实验钢的化学成分

图1 Ti-V-Mo实验用钢的热模拟工艺示意图

图 2 实验钢过冷奥氏体的等温转变曲线

图3 不同终冷温度实验钢的OM像

图4 不同终冷温度实验钢的SEM像

图5 不同终冷温度实验钢中铁素体晶粒的平均尺寸

图6 在660 ℃ 终冷实验钢中纳米析出相的HRTEM像、Fourier变换衍射谱和EDS

图7 不同终冷温度实验钢的TEM像和尺寸分布

图8 不同终冷温度实验钢中纳米析出相的平均尺寸

图9 不同终冷温度实验钢的硬度及其拟合曲线

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