Effect of Cooling Rate after Deformation on Microstructure of V-N Microalloying High Strength Aseismic Rebar

Dong Wei Zhao; Jian Chun Cao; Wei Chen; Lei Deng; Zhe Shi; Xin Qi

doi:10.4028/www.scientific.net/AMR.482-484.1600

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 482-484Effect of Cooling Rate after Deformation on...

Effect of Cooling Rate after Deformation on Microstructure of V-N Microalloying High Strength Aseismic Rebar

Abstract:

Thermo-simulated test was conducted to study the effect of cooling rate from 1 °C/s to 15 °C/s on microstructure of V-N microalloying high strength aseismic rebar. Microstructure investigation was done using both optical and scanning electron microscopes. Microstructures in center of the rebar mainly consist of ferrite, pearlite, and bainite. The percentage of bainite increases below 5 °C/s cooling rate and decreases between 5 °C/s and 15 °C/s with the increase in cooling rate. At the cooling rate of 15 °C/s the fraction of bainite is about 7.7%, and the finest ferrite with 5.3 μm was obtained. Higher strength value obtained at the cooling rate 8~10 °C/s is due to the combination of smaller ferrite and about 10 % bainite.

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Periodical:

Advanced Materials Research (Volumes 482-484)

Pages:

1600-1604

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.482-484.1600

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Online since:

February 2012

Authors:

Dong Wei Zhao, Jian Chun Cao, Wei Chen, Lei Deng, Zhe Shi, Xin Qi

Keywords:

Aseismic Rebar, Cooling Rate, Microstructure, V-N Microalloying

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