Mathematical Simulation of Heat Transfer During Solidification of GCr15 Bearing Steel
Author of the article:ZHANG Zhenxue;ZHANG Hui;WANG Minglin;LI Pengfei;WANG Xuebing
Author's Workplace：(National Engineering Research Center of Continuous Casting Technology,Central Iron&Steel Research Institute,Beijing 100081,China
Key Words：bearing steel heat transfer of solidification mathematical simulation
Abstract：
Taking GCr15 bearing steel produced by a steel plant as the research object,the mathematical model of solidification heat transfer of GCr15 bearing steel billet was established.The influence of the change of drawing speed on the shell thickness and the temperature of each characteristic point on the cross section of the billet was studied.The results show that the speed drawing increasing of 0.1 m/min,slab center the liquidus temperature(1 460℃)and solidus temperature of(1 325℃)location backward will delayed by 1.1 m and 4.1 m,respectively.At the beginning and the end of solidification,the shell growth rate is faster.The reason is that the solidification rate of the billet is higher because of the higher cooling strength and cooling rate in the mold.At the end of solidification,the supercooling degree of molten steel is large,and the central part of the billet solidifies in the form of equiaxed crystal,which promotes the rapid growth of shell thickness at the end of solidification.
