Abstract：In order to investigate the influence of the mechanical vibration applied in the technology of twin-roll strip cast-rolling on the microstructure and mechanical properties of the cast-rolling strip，a ?500 mm×350 mm micro-amplitude twin-roll strip cast-rolling mill was designed and manufactured. The casting mill was used as an experimental platform for a number of process exploration experiments，and the reasonable process parameters that could achieve stable production of twin-roll vibratory cast-rolling strips were finally determined. Then the microstructure and mechanical properties of the 20CrMn alloy steel cast-rolling strip obtained under vibratory and vibrationless conditions were tested and analyzed. The microstructure observation result shown that the average grain size of the normal surface of the vibratory cast-rolling strip reduced from 70 to 35 μm compared with the vibrationless one，and the grains on the vibratory and the vibrationless side of the longitudinal section of the vibratory cast-rolling strip were also refined to different degrees.The tensile test result shown that the yield strength，tensile strength and elongation of the vibratory cast-rolling strip in the vertical-rolling direction were respectively 21.36%，27.35%，42.86% higher than those of the conventional vibrationless cast-rolling strip. The above research results prove that mechanical vibration can effectively improve the microstructure，refine the grains，and improve the mechanical properties of the strip.
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2018, Vol. 53 
