铁素体区等温过程中<strong>Ti-Mo-Cu</strong>微合金钢中的共析出行为

doi:10.11900/0412.1961.2020.00521

金属学报

2022, Vol. 58

Issue (3): 355-364 DOI: 10.11900/0412.1961.2020.00521

研究论文

本期目录 | 过刊浏览

铁素体区等温过程中Ti-Mo-Cu微合金钢中的共析出行为

唐帅¹(

), 蓝慧芳¹, 段磊¹, 金剑锋², 李建平¹, 刘振宇¹, 王国栋¹

^1.东北大学轧制技术及连轧自动化国家重点实验室沈阳 110819
^2.东北大学材料科学与工程学院沈阳 110819

Co-Precipitation Behavior in Ferrite Region During Isothermal Process in Ti-Mo-Cu Microalloyed Steel

TANG Shuai¹(

), LAN Huifang¹, DUAN Lei¹, JIN Jianfeng², LI Jianping¹, LIU Zhenyu¹, WANG Guodong¹

^1.State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
^2.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

唐帅, 蓝慧芳, 段磊, 金剑锋, 李建平, 刘振宇, 王国栋. 铁素体区等温过程中Ti-Mo-Cu微合金钢中的共析出行为[J]. 金属学报, 2022, 58(3): 355-364.
Shuai TANG, Huifang LAN, Lei DUAN, Jianfeng JIN, Jianping LI, Zhenyu LIU, Guodong WANG. Co-Precipitation Behavior in Ferrite Region During Isothermal Process in Ti-Mo-Cu Microalloyed Steel[J]. Acta Metall Sin, 2022, 58(3): 355-364.

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摘要:

碳化物和Cu的共析出是提高微合金钢强度的一种有效手段，本工作利用OM和TEM研究了Ti-Mo-Cu微合金钢在不同等温温度下复合型碳化物和ε-Cu的共析出行为，利用复合析出相固溶析出模型和经典形核长大理论对Ti-Mo-Cu微合金钢的析出动力学进行了计算。结果表明，(Ti, Mo)C与ε-Cu二者独立析出，分别与铁素体基体呈N-W和K-S取向关系，在600℃时析出以ε-Cu为主，620℃发生(Ti, Mo)C与ε-Cu的共析出，而640~660℃时析出以(Ti, Mo)C相间析出为主。热动力学计算表明，在600~660℃范围内，随温度提高，(Ti, Mo)C中的Ti/Mo原子比由2.5增大到4.5，碳化物组成由Ti_0.71Mo_0.29C演变为Ti_0.79Mo_0.21C，(Ti, Mo)C与ε-Cu的析出-温度-时间(PTT)曲线存在交点，当温度低于616℃时，ε-Cu优先析出，温度在616℃附近时，发生(Ti, Mo)C与ε-Cu的共析出，当温度高于616℃时，(Ti, Mo)C优先析出，很好解释了实验现象。

关键词 ： Ti-Mo-Cu微合金钢, (Ti， Mo)C, ε-Cu, 共析出, 析出动力学

Abstract：

The coprecipitation of carbides and copper (Cu) particles is an effective technique for strengthening microalloyed steel. In this study, OM and TEM techniques were used to investigate the coprecipitation behavior of carbides and ε-Cu in Ti-Mo-Cu microalloyed steel at different isothermal temperatures. A solid solution precipitation model and the classical nucleation theory of precipitates were used to calculate the precipitation kinetics in the Ti-Mo-Cu microalloyed steel. The results show that (Ti, Mo)C and ε-Cu precipitated independently, and they showed the N-W and K-S orientations with the ferrite matrix, respectively. The dominant precipitates at 600^oC are ε-Cu. (Ti, Mo)C and ε-Cu were coprecipitated at 620^oC. At 640-660^oC, (Ti, Mo)C was mainly precipitated in the form of interphase precipitation. Thermodynamic calculations showed that in the range of 600-660^oC with an increase in temperature, the Ti/Mo atomic ratio in (Ti, Mo)C increases from 2.5 to 4.5, and the carbide changes from Ti_0.71Mo_0.29C to Ti_0.79Mo_0.21C. The precipitation-temperature-time (PTT) curves of (Ti, Mo)C and ε-Cu intersect at 616^oC, indicating simultaneous precipitation of (Ti, Mo)C and ε-Cu. (Ti, Mo)C and ε-Cu preferentially precipitate below and above 616^oC, respectively. The calculation and experimental results are consistent.

Key words： Ti-Mo-Cu microalloyed steel (Ti, Mo)C ε-Cu co-precipitation precipitation kinetics

收稿日期: 2020-12-28

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目(51774083);中央高校基本科研业务费项目(N2107002);高等学校学科创新引智计划项目(B20029);国家重点研发计划项目(2017YFB0304402)

作者简介: 唐帅，男，1981年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00521 或 https://www.ams.org.cn/CN/Y2022/V58/I3/355

图1 实验用钢不同等温温度下显微组织的OM像(a) 600oC (b) 620oC (c) 640oC (d) 660oC

图2 600℃等温后试样中的ε-Cu的TEM明场像和SAED花样(a) at the dislocation (b) interphase precipitate near the grain boundary(c) bright field image of Cu (d) dark field image of Cu and corresponding SAED pattern (inset)

图3 620~660℃等温后试样中的相间析出碳化物的TEM像和SAED花样

表1 计算中使用的参数[29,30,35~41]

图4 不同温度下(Ti, Mo)C与ε-Cu在铁素体中析出热/动力学的计算结果(a) Ti/Mo atomic ratio and x (b) driving force (c) PTT curves (d) solid solution content

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