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GCr15轴承钢大方坯连铸过程凝固传热数值模拟
Mathematical Simulation of Heat Transfer During Solidification of GCr15 Bearing Steel
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- DOI:
- 作者:
- 张振学 张慧 王明林 李鹏飞 王学兵
ZHANG Zhenxue;ZHANG Hui;WANG Minglin;LI Pengfei;WANG Xuebing
- 作者单位:
- 钢铁研究总院连铸技术国家工程研究中心
(National Engineering Research Center of Continuous Casting Technology,Central Iron&Steel Research Institute,Beijing 100081,China
- 关键词:
- 轴承钢 凝固传热 数值模拟
bearing steel heat transfer of solidification mathematical simulation
- 摘要:
- 以某钢厂生产的GCr15轴承钢为研究对象,建立了GCr15轴承钢大方坯的凝固传热数学模型,结合现场的测温实验数据验证了模型的可靠性。研究了拉速的变化对坯壳厚度、铸坯横截面上各特征点温度的影响。结果表明,拉速每提高0.1 m/min,铸坯中心液相线温度(1 460℃)与固相线温度(1 325℃)所在位置分别向后推迟了1.1 m与4.1 m。在铸坯凝固初期与凝固末期,坯壳生长速度较快。原因是在结晶器内的冷却强度较大,冷却速率较大,促使铸坯的凝固速率较高;在凝固末期,钢液的过冷度较大,同时铸坯中心部位以等轴晶的形式凝固,促使凝固末期的坯壳厚度增长较快。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.