铸坯凝固组织特征对于连铸坯粗坯质量具有重要影响.通过建立重轨钢U71Mn方坯连铸过程中传热和凝固组织模拟数学模型,研究了CA模型特征参数和连铸操作工艺参数对于凝固组织特征的影响规律.研究结果表明:平均形核过冷度控制柱状晶区域,随着该值的增大,柱状晶区域也随之增大;最大形核密度控制晶粒尺寸,该值越大晶粒的尺寸则越小.连铸拉坯速度波动在±0.5 m/min时,最终铸态组织特征并没有明显变化,而浇注温度对于最终铸坯组织结构具有较大的影响,晶粒平均半径由15℃的1.555 mm增加到45℃的1.721 mm,并且中心等轴晶比例逐渐减小.因此,连铸生产过程中,在满足钢液顺利浇注的条件下,降低浇注钢液的过热度会很大程度上改善重轨钢内部组织结构,提高铸坯内部质量.
参考文献
| [1] | 于艳梅 .过冷熔体中枝晶生长的相场法数值模拟[D].西北工业大学,2002. |
| [2] | Spittle J A;Brown S G .Computer Simulation of the Effects of Alloy Variables on the Grain Struetures of Castings[J].Acta Metallurgica,1989,37(07):1803. |
| [3] | 陈晋 .基于元胞自动机方法的凝固过程微观组织数值模拟[D].南京:东南大学,2005. |
| [4] | Wolfram S .Statistical Mechanics of Cellular Automata[J].Reviews of Modern Physics,1983,55(03):601. |
| [5] | Zhu P P;Smith R W .Dynamic Simulation of Crystal Growth by Monte Carlo Method-1 Model Deseription and Kineties[J].Aeta Metall Mater,1992,40(04):683. |
| [6] | Gandin C A;Rappaz M A .Coupled Finite Element-Cellular Automaton Model for the Prediction of Dendritic Grain Struc ture in Solidification Process[J].Acta Metallurgica,1994,42(07):2233. |
| [7] | Gandin C A;Desbiolles J L .A Three Dimensional Cellular Automaton Finite Element Model for the Prediction of Solidification Grain Structures[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1999,30(12):3153. |
| [8] | Chen CP.;Tsao CYA. .RESPONSE OF SPRAY-DEPOSITED, STIRRED-CAST AND CONVENTIONAL CAST PB-SN ALLOYS TO DEFORMATION IN THE SEMI-SOLID STATE[J].Journal of Materials Science,1995(16):4019-4026. |
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