Effect of Finish Rolling Temperature on Microstructure Evolution and Hardness of Ti-V-Mo Complex Microalloyed Steel

doi:10.11901/1005.3093.2018.522

Chinese Journal of Materials Research

2019, Vol. 33

Issue (3): 191-198 DOI: 10.11901/1005.3093.2018.522

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Effect of Finish Rolling Temperature on Microstructure Evolution and Hardness of Ti-V-Mo Complex Microalloyed Steel

Ke ZHANG¹(

),Shiyu ZHAO¹,Fengli SUI¹,Zhaodong LI²,Xiaoyu YE³,Xinjun SUN²,Zhenyi HUANG¹,Qilong YONG²

1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China
2. Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
3. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua Group Co., Ltd., Panzhihua 617000, China

Cite this article:

Ke ZHANG,Shiyu ZHAO,Fengli SUI,Zhaodong LI,Xiaoyu YE,Xinjun SUN,Zhenyi HUANG,Qilong YONG. Effect of Finish Rolling Temperature on Microstructure Evolution and Hardness of Ti-V-Mo Complex Microalloyed Steel. Chinese Journal of Materials Research, 2019, 33(3): 191-198.

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Abstract

The effect of finish rolling temperature on microstructure, precipitates, hardness of Ti-V-Mo microalloyed steel was investigated by means of Gleeble3800 thermal-mechanical simulator, OM, SEM, TEM and Vickers-hardness tester. The results show that the microstructures of Ti-V-Mo microalloyed steel, which was finish-rolled at different temperatures, consist of all polygonal ferrite, and the finish rolling temperature has a major impact on the precipitates and hardness. When the finish rolling temperature decreases from 1000^oC to 800^oC, the hardness increases from 400 HV to 427 HV. Meanwhile, the average grain size of ferrite in Ti-V-Mo microalloyed steel decreases gradually from 3.44 μm to 3.05 μm and the amount of (Ti, V, Mo)C particles increase monotonously, while their mean size reduces from 8.38 nm to 6.25 nm. The main factors responsible to the enhancement of hardness are the refinement of average ferrite grain size as well as the increasing amount and further refinement of nano-sized (Ti, V, Mo)C particles as the finish rolling temperature decreases. The nucleation rate of (Ti, V, Mo)C carbides in austenite decreased when the finish rolling temperature below 980^oC, while more tiny particles precipitated from ferrite matrix, which promotes the increase of hardness.

Key words: metallic materials Ti-V-Mo complex microalloyed steel finish rolling temperature hardness ferrite (Tim,V,Mo)C

Received: 27 August 2018

ZTFLH:

TG142.1

Fund: National Key Research and Development Program of China(2017YFB0305100);National Key Research and Development Program of China(2017YFB0304700);National Natural Science Foundation of China(1704008);National Natural Science Foundation of China(51574001);National Natural Science Foundation of China(1674004);the Opening Foundation of State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization(8100009);National Science Foundation of Anhui University of Technology(QZ201603)

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	Articles by authors
	Ke ZHANG
	Shiyu ZHAO
	Fengli SUI
	Zhaodong LI
	Xiaoyu YE
	Xinjun SUN
	Zhenyi HUANG
	Qilong YONG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.522 OR https://www.cjmr.org/EN/Y2019/V33/I3/191

Fig.1 Schematic illustration describing the used TMCP schedule of Ti-V-Mo steel

Fig.2 OM images of different finish rolling temperatures of Ti-V-Mo steel (a) 800℃, (b) 850℃, (c) 900℃, (d) 920℃, (e) 950℃, (f) 1000℃

Fig. 3 Volume fractions of various phases as a function of temperature of Ti-V-Mo steel

Fig.4 Microstructure of the Ti-V-Mo steels finish rolled at 800℃ (a), 920℃ (b), 1000℃ (c), where black and blue lines indicate the high misorientation angle boundaries (θ ≥ 15o) and low misorientation angle boundaries (2o≤ θ <15o), respectively

Fig.5 Misorientation angle boundaries distribution of Ti-V-Mo steels at different finish rolling temperature

Fig.6 TEM images of samples finish rolled at different temperatures (a) 800℃, (b) 900℃, (c) 1000℃, (d) EDS of a particle in Fig. 6a

Fig.7 Size distribution of (Ti, V, Mo)C particles in the samples finish rolled at different temperatures

Fig.8 Nucleation Temperature curves of (Ti, V, Mo)C precipitated in austenite^[24]

Fig.9 TEM images of samples finish rolled at 800℃ (a) and 1000℃ (b) (Precipitates with arrowheads are large (Ti, V, Mo)C particles (>10 nm) precipitated from austenite matrix, while the other tiny (Ti, V, Mo) C particles (<10 nm) are precipitated from ferrite matrix)

Fig.10 Hardness of samples finish rolled at different temperatures

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