GCr15钢大方坯传热凝固数值模拟

摘要/Abstract

摘要： 以某钢厂GCr15钢大方坯为研究对象，采用ProCAST软件建立凝固数学模型，研究了过热度、拉速和比水量对大方坯凝固过程的影响，并通过对铸坯中心固相率及液芯长度的分析，确定了最佳末端电磁搅拌位置，并优化了拉速。研究结果表明：过热度对铸坯凝固影响最小，随着过热度增加，铸坯表面温度升高，铸坯液芯长度和液相区长度均随之增加，而两相区长度则随之减小；拉速对铸坯凝固影响最大，拉速提高，铸坯表面温度、液芯长度、两相区长度、液相区长度均增大；比水量增加，铸坯表面温度降低，液芯长度减小；当比水量为0.29 L/kg时，过热度应控制在15~35℃，拉速需控制在0.46~0.49 m/min，且最佳拉速为0.48 m/min。

关键词: 大方坯, 数值模拟, 中心固相率, 液芯长度

Abstract: The solidification mathematical model was established by using GCr15 steel bloom as a research object. The effects of superheat，casting speed and cooling water on the solidification process of bloom were studied. By analyzing the center solid fraction and liquid core length of the bloom，the optimum F-EMS position was determined and the casting speed was optimized. The results showed that the superheat had the little effect on the solidification of the bloom. With the increase of the superheat，the surface temperature of the billet increased，the length of liquid core and the length of liquid zone increasd，while the length of two-phase zone decreased. The effect of casting speed was the largest，the surface temperature，the length of liquid core，the length of two-phase zone and the length of liquid zone were all increased with the increase of the casting speed. With the increase of the water ratio，the surface temperature of the billet and the length of the liquid core decreasd. When the water ratio was 0.29 L/kg，the superheat degree should be controlled at 15–35℃，the casting speed could be controlled in the range of 0.46–0.49 m/min，and the best casting speed was 0.48 m/min.

Key words: bloom, numerical simulation, center solid fraction, liquid core length

王德炯1，焦帅2，殷皓1，孙彦辉3，赵勇3，李晓滨4. GCr15钢大方坯传热凝固数值模拟[J]. 炼钢.

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GCr15钢大方坯传热凝固数值模拟

Numerical simulation of heat transfer and solidification in GCr15 steel bloom

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