Abstract
In this study, the mechanical properties and phase composition of HRB400 rebars produced via a novel direct rolling of without-heating (DROW) process and the traditional hot rolling (THR) process were compared experimentally, and the effect of the temperature gradient on the phase distribution in the rebar was investigated by combining phase transformation dynamics with the finite element method. Compared with the THR process, the grains of the produced rebar were more refined when using the DROW process, and the average yield strength and tensile strength increased by 17 and 5 MPa, respectively. Moreover, by adopting the DROW process, the volume fraction of pearlite could be increased, thereby inhibiting the growth of ferrite. The DROW process was demonstrated to not only reduce the energy consumption, but also enhance the mechanical properties of the rebar.
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