Effect of V-Ti Addition on Microstructure Evolution and Mechanical Properties of Hot-Rolled Transformation-Induced Plasticity Steel

doi:10.1007/s40195-018-0796-3

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (3): 352-360.DOI: 10.1007/s40195-018-0796-3

所属专题： 2019年钢铁材料专辑

收稿日期:2018-05-11 修回日期:2018-07-02 出版日期:2019-03-10 发布日期:2019-02-22
作者简介:

Huan Liu is a Lecturer, Master’s Supervisor, College of Mechanics and Materials, Hohai University. He earned his Ph.D. from Southeast University in 2014 and then became a Lecturer in Hohai University. He was selected into the “Shuangchuang Program of Jiangsu Province” and “Dayu Scholars Program of Hohai University” in 2017. So far, he has published more than 30 scientific papers (indexed by SCI) and held 2 authorized Chinese patents. His papers were cited more than 200 times. His research interests mainly include design of high-strength and high ductility magnesium alloys, heat-resistant magnesium alloys, fabrication of fine-grained and ultra-fine-grained metallic materials, and biomedical materials.

Xian-Hua Chen is a Professor of Chongqing University and received his Doctor’s degree from Institute of Metal Research, Chinese Academy of Sciences in 2008. He is Director of Institute of Functional Mg Alloys in National Engineering Research Centre for Magnesium Alloys, Director of International Joint Laboratory for Light Alloys (Ministry of Education), Editorial Board of Acta Metallurgica Sinica (English Letters) (SCI). His research work is focused on new high-performance structural and functional magnesium alloys, and purification technology of magnesium alloys. He also worked in Materials Technology Laboratory of CANMET in Canada as visiting scientist during 2012-2013. He has 22 patents, 1 book and more than 60 SCI papers, including 2 science papers. His papers were cited more than 2700 times. He was awarded the Provincial and Ministerial S&T Prize in 2013, 2014 and 2017. He was the Chairman of “The 2nd China Youth Scholars Conference on Mg Alloys.”

Effect of V-Ti Addition on Microstructure Evolution and Mechanical Properties of Hot-Rolled Transformation-Induced Plasticity Steel

Hai-Cun Yu¹, Zhao-Zhen Cai¹(), Gui-Qin Fu¹, Miao-Yong Zhu¹

1 School of Metallurgy, Northeastern University, Shenyang 110819, China

Received:2018-05-11 Revised:2018-07-02 Online:2019-03-10 Published:2019-02-22

摘要/Abstract

Abstract:

In order to reveal the effect of V-Ti addition on the microstructure evolution and the mechanical properties of hot-rolled transformation-induced plasticity (TRIP) steel, two steels with 0.072V-0.051Ti steel (Bear-V-Ti steel) and 0.001V-0.001Ti steel (Free-V-Ti steel) were designed, respectively, and the comparison analyses were carried out by performing thermodynamic calculation and an experiment. With the thermodynamic calculation, the critical annealing temperature of a large fraction of retained austenite (~ 51%) obtained via solute enrichment was determined, and an optimized quenching at 650 °C and tempering at 200 °C adopted on the as-hot-rolled steel. The results show that the V-Ti TRIP steel displays more optimum mechanical stability during the tensile deformation, since the fraction and the mechanical stability of retained austenite are improved and the microstructure is also ultrarefined by V-Ti alloy precipitation. The yield strength of Bear-V-Ti steel increases from 650 to 800 MPa, and the ductility reaches 37%, showing that the comprehensive mechanical properties are greatly improved.

Key words: Medium manganese steel, Microstructure evolution, Mechanical properties, V-Ti

. [J]. Acta Metallurgica Sinica (English Letters), 2019, 32(3): 352-360.

Hai-Cun Yu, Zhao-Zhen Cai, Gui-Qin Fu, Miao-Yong Zhu. Effect of V-Ti Addition on Microstructure Evolution and Mechanical Properties of Hot-Rolled Transformation-Induced Plasticity Steel[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(3): 352-360.

图/表 10

Table 1 Chemical composition of two experimental steels (wt%)

Steel	C	Mn	Al	V	Ti	P	S	N
Free-V-Ti	0.13	6.22	1.38	-	-	≤ 0.04	≤ 0.04	0.004
Bear-V-Ti	0.13	6.24	1.37	0.072	0.051	≤ 0.04	≤ 0.04	0.004

Fig. 1 Phase fraction of experimental steel predicted by Thermo-Calc software a and schematic illustration of heat treatment process b

Fig. 2 Thermodynamics calculations for Free-V-Ti steel and Bear-V-Ti steel based on TCFE7 database of Thermo-Calc: a C content in austenite; b Mn content in austenite; c Al content in austenite; d predicted fraction of retained austenite as a function of temperature

Fig. 3 SEM micrographs of hot-rolled Free-V-Ti steel samples after quenching at different temperatures: a 600 °C; b 650 °C; c 700 °C; d 750 °C

Fig. 4 SEM micrographs of hot-rolled Bear-V-Ti steel samples after quenching at different temperatures: a 600 °C; b 650 °C; c 700 °C; d 750 °C

Fig. 5 TEM micrographs of Bear-V-Ti after heat-treated at 650 °C, followed by tempering at 200 °C: a bright-field image; b dark-field image; c morphologies of precipitates; d EDS analysis results of small precipitates

Fig. 6 Mechanical properties of hot-rolled samples: a true strain-stress curves of Free-V-Ti steel; b true strain-stress curves of Bear-V-Ti steel; c UTS and TEL of Free-V-Ti steel; d UTS and TEL of Bear-V-Ti steel

Fig. 7 Measured austenite fractions of undeformed and fractured samples and austenite transformation ratio at 600 °C, 650 °C, 700 °C, and 750 °C: a XRD patterns of Bear-V-Ti steel at 650 °C; b XRD patterns of Free-V-Ti steel at 650 °C; c measured austenite fractions; d austenite transformation ratio

Fig. 8 Tensile properties and micrographs of hot-rolled samples: a yield strength of Free-V-Ti steel and Bear-V-Ti steel; b UTS × TEL of Free-V-Ti steel and Bear-V-Ti steel; c OM micrograph of Free-V-Ti steel at 650 °C; d OM micrograph of Bear-V-Ti steel at 650 °C

Fig. 9 True strain-stress plot a and work-hardening rate at 650 °C b of Bear-V-Ti and Free-V-Ti steels

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Effect of V-Ti Addition on Microstructure Evolution and Mechanical Properties of Hot-Rolled Transformation-Induced Plasticity Steel

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