Effect of vibration on the formation of second phase particles in cast-rolling strips

Abstract

Taking 20CrMn steel as the experimental object, the vibration and non-vibration cast-rolling comparison experiments were carried out on the self-developed twin-roll strip vibration cast-rolling mill. And a series of tests such as tensile test, fracture morphology observation and energy spectrum analysis were carried out on the obtained cast-rolling strips. This paper focuses on the analysis of the test results from the perspective of the second phase particles, in order to explore the effect of vibration on the precipitation of the second phase particles in cast-rolling. The analysis results show that the vibration can promote the uniform distribution of alloying elements, thereby inhibiting the formation of large size second phase particles which are mainly concentrated in the central region of the strip in the late solidification stage, and promoting the precipitation of the dispersed small-sized particles in the high-temperature plastic deformation stage, and finally improving the mechanical properties of the cast-rolling strip. At the end of the paper, the influence of vibration parameters such as vibration amplitude and vibration frequency on the formation of second phase particles is further analyzed.