Study On Microstructure Evolution Law Of Bearing Steel Billet In Solidification Process

The production of bearing steel provides the basic components for machining,while the GCr15 bearing steel is the most industrially used steel product,accounting for more than 80% of the world's total output.Based on the actual continuous casting process parameters of GCr15 rectangular billet,.The temperature field of solidification process of slab was simulated by Pro CAST simulation software.And the growth and evolution of dendritic structure were simulated.The influence of continuous casting process parameters on the dendritic microstructure evolution of the casting blank and the location of CET transformation were studied.The equivalent electromagnetic stirring method was used to study the current strength and the quality of the casting blank.The effect of the secondary diameter arm spacing.The Pro CAST software simulation found that the broad surface of the slab has the same temperature drop trend as the center of the narrow surface,and the temperature drop at the center of the slab is slow.Within a certain range,the increase of the drawing speed and the superheat degree can cause the surface temperature of the slab to rise,wherein for every 0.1m/min of the drawing speed,the surface temperature of the slab after the slab exits the second cooling zone increases by 46.5 °C.The increase of water volume in the second cold zone can cause the surface temperature of the slab to decrease.For each 5% increase in water volume,the surface temperature of the slab in the second cold zone is reduced by about 12.5 °C.The effect of superheat on the solidification structure of the slab is more obvious than the drawing speed,which can cause the difference in the number of grains,the average grain radius and the maximum grain area at the same position in the columnar crystal region of the slab.The CET transition position of the solidification of the slab occurs at 39-68 mm.Increasing the superheat and the pulling speed can cause the delay and advancement of the CET transition position,respectively.Figure44;Table7;Reference 67...