Numerical Simulation of Solidification Structure of 28MnCr5 Gear Steel During the Continuous Casting Process

摘要

28MnCr5 is a kind of advanced gear steel. Its internal quality is closely related with its solidification structure. During the production process of continuous casting, the relationship between solidification structure and actual parameters has been investigated. At the same time, CAFE model of ProCAST software was used to simulate the solidification structure of gear steel billet according to the actual casting parameters. When other conditions remain the same in the premise and superheat of steel changes from 10℃ to 40℃, columnar crystals developed and equiaxed grains are significantly reduced. When superheat increased to 40℃, equiaxed grains don't generally change. With the superheat changing from 10℃ to 40℃, the grain density decreases from 6.911×10~6m~(-2) to 4.133×10~6m~(-2) and the average grain surface area increases from 1.447×10~(-7)m~2 to 2.419×10~(-7)m~2. At the same time the maximum grain surface area increases from 4.9×10~(-7)m~2 to 3.56×10~(-6)m~2 and the average grain radius increases from 269.4μm to 410.2μm. Due to the solidification structure of 28MnCr5 gear steel and its internal quality requirements, the superheat should be reduced as far as possible when other conditions were met.