Design and Performance of 690 MPa Grade Low-Carbon Microalloyed Construction Structural Steel with High Strength and Toughness

doi:10.11900/0412.1961.2020.00195

Acta Metall Sin

2021, Vol. 57

Issue (3): 340-352 DOI: 10.11900/0412.1961.2020.00195

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Design and Performance of 690 MPa Grade Low-Carbon Microalloyed Construction Structural Steel with High Strength and Toughness

ZHU Wenting¹, CUI Junjun¹, CHEN Zhenye¹^,², FENG Yang¹, ZHAO Yang³, CHEN Liqing¹(

)

^1.State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
^2.Technical Department, Technology Research Institute of HBIS, Shijiazhuang 050000, China
^3.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Cite this article:

ZHU Wenting, CUI Junjun, CHEN Zhenye, FENG Yang, ZHAO Yang, CHEN Liqing. Design and Performance of 690 MPa Grade Low-Carbon Microalloyed Construction Structural Steel with High Strength and Toughness. Acta Metall Sin, 2021, 57(3): 340-352.

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Abstract

The rapid development of high-rise buildings has increasingly brought requirements for construction steels with high strength and toughness. For high-rise building structural steels with low yield ratio, good weldability and excellent resistance to fire and corrosion are generally required. However, high grade construction steels with comprehensive properties are yet to be developed. In this study, a 690 MPa grade functionally structured fire and corrosion resistant high strength construction steel was designed based on the thermodynamic calculations of the JMatPro software and interactions among chemical elements. The chemical composition (mass fraction, %) of the designed steel was Fe-0.08C-0.3Si-1.1Mn-0.12(Nb + V + Ti)-1.6(Cr + Cu + Ni + Mo)-0.002B-0.004N. After laboratory melting and a thermomechanical controlled process (TMCP), the microstructure features, strengthening and toughening mechanisms, mechanical properties, and fire and corrosion resistances were characterized and analyzed by EPMA, EBSD, and performance testing. Results show that the microstructure of this low-carbon microalloyed steel at its TMCP state is mainly composed of bainite ferrite, granular bainite, and lath-like bainite. The yield strength, tensile strength, total elongation, and yield ratio at room temperature are 700 MPa, 878 MPa, 20%, and 0.80, respectively, and this steel possesses good low-temperature toughness. This low-carbon microalloyed steel meets requirements for fire resistance at elevated temperatures up to 600^oC for 3 h. It is disclosed that the granular bainite plays a positive role in improving corrosion resistance under marine environment. A further analysis shows that the tested steel possesses excellent strength and toughness resulting from the cumulative effects of precipitation strengthening, grain refinement strengthening, dislocation strengthening, and solid solution strengthening. Moreover, after observation and analysis of crack initiation and propagation underneath the fractured surface of low-temperature impacted samples, the microvoids prefer to nucleate at high-angle boundaries containing brittle phases and grow in a Z-type to cross lath-like bainite to consume more energy. Multiple crack deflections are beneficial for toughness improvements.

Key words: low-carbon microalloyed steel microstructure strengthening and toughening mechanism mechanical property fire resistance corrosion resistance

Received: 03 June 2020

ZTFLH:

TG113

Fund: National Natural Science Foundation of China(51904071);Fundamental Research Funds for the Central Universities(N180703011);Key Research and Development Program of Hebei Province(18211019D);Start-Up Project of Doctor Scientific Research of Liaoning Province(2020-BS-271)

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	Wenting ZHU
	Junjun CUI
	Zhenye CHEN
	Yang FENG
	Yang ZHAO
	Liqing CHEN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00195 OR https://www.ams.org.cn/EN/Y2021/V57/I3/340

Fig.1 Calculated mass fractions of precipitated phases versus temperature in the tested steel

Fig.2 Effects of Ti, Nb, V (a), and Mo (b) contents on mass fractions of M₂₃C₆ (solid lines) and M(C, N) (dash lines) phases in the tested steel

Fig.3 Sketch of the thermo-mechanical controlled process (TMCP) for the tested steel

Fig.4 SEM images of the tested steel at different positions (LB—lath-like bainite, GB—granular bainite, BF—bainite ferrite, M/A—martensite/austenite)

Fig.5 EBSD images of the tested steel at 1/4 thickness (a) and 1/2 thickness (b) (The black lines and red lines denote the high angle grain boundaries (misorientation angle > 15°) and low angle grain boundaries (misorientation angle 2°-15°), respectively), and corresponding point-to-point misorientation profiles along line AB in Fig.5a (c) and line CD in Fig.5b (d)

Fig.6 Polarization curves of the tested steel at different thicknesses

Fig.7 Nyquist plots of the tested steel at different thicknesses (Z_im—real part of impedance, Z_re—imaginary part of impedance)

Fig.8 Tensile stress-strain curve of the tested steel at 1/4 thickness

Fig.9 High magnified SEM images (a, c, e) and distributions of carbon (b, d, f) in the tested steel at different thicknesses

Fig.10 Schematics of the diffusion of carbon atoms in granular bainite (a) and lath-like bainite (b)

Fig.11 TEM images of the tested steel at 1/4 thickness subjected to TMCP treatment

Fig.12 SEM fractographs of the tested steel at 1/4 thickness showing morphologies and cracks propagation paths (showed by white arrows) underneath the fracture surface at different impact temperatures (Area I in Fig.12b indicates microcrack was formed by the aggregation of microvoids, area II Fig.12b indicates the growth of microcrack was obstructed by lath-like bainite)

Fig.13 EBSD images of the tested steel at 1/4 thickness showing morphologies and cracks propagation paths underneath the fracture surface at impact temperatures of -20^oC (a) and -40^oC (b) (The black lines and red lines denote the high angle grain boundaries (misorientation angle > 15°) and low angle grain boundaries (misorientation angle 2°-15°), respectively)

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