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

doi:10.11900/0412.1961.2020.00521

Acta Metall Sin

2022, Vol. 58

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

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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

Cite this article:

TANG Shuai, LAN Huifang, DUAN Lei, JIN Jianfeng, LI Jianping, LIU Zhenyu, WANG Guodong. Co-Precipitation Behavior in Ferrite Region During Isothermal Process in Ti-Mo-Cu Microalloyed Steel. Acta Metall Sin, 2022, 58(3): 355-364.

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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

Received: 28 December 2020

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(51774083);Fundamental Research Funds for the Central Universities of China(N2107002);Project of Introducing Talents of Discipline to Universities(B20029);National Key Research and Development Program of China(2017YFB0304402)

About author: TANG Shuai, associate professor, Tel: 17640032562, E-mail: tangshuai@ral.neu.edu.cn

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	Shuai TANG
	Huifang LAN
	Lei DUAN
	Jianfeng JIN
	Jianping LI
	Zhenyu LIU
	Guodong WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00521 OR https://www.ams.org.cn/EN/Y2022/V58/I3/355

Fig.1 OM images of experiment steel with different holding temperatures (F—ferrite, B—bainite, M—martensite)

Fig.2 TEM bright field images and SAED pattern of the interphase precipitate in speciments isothermally treated at 600^oC (IP—interphase precipitation)

Fig.3 TEM bright field images of the interphase precipitate in speciments isothermally treated at 620^oC (a), 640^oC (b), and 660^oC (c), and dark filed image at 660^oC and corresponding SAED pattern (inset) (d)

Table 1 Parameters used in calculations^{[29,30,35-41]}

Fig.4 Thermodynamics/kinetics calculation results of precipitation of (Ti, Mo)C and ε-Cu in ferrite at different temper-atures (PPT—precipitation-temperature-time, t₀—the precipitation start time, t_0.05—the time of pricipitates fraction of 5%)

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