CAJ | 학술논문

将二元合金枝晶凝固传输模型及相应的T-fs一CL耦合求解方法扩展到描述多元合金在Biot≤0.1条件下的凝固.基于提出的扩展模型及算法,提出一种考虑传热影响的预测Biot≦0.1合金凝固路径及微观偏析的方法.该算法与Thermo-Calc热力学计算软件接口程序TQ6相耦合,用于实时计算每次迭代需要的热力学数据.Al-2Si-3Mg三元合金实例计算证实提出的模型及算法和凝固路径与微观偏析预测方法的实用性与可靠性,Al-5.17Cu-2.63Si三元合金凝固实验结果与预测结果的取得较好的一致性.
장이원합금지정응고전수모형급상응적T-fs일CL우합구해방법확전도묘술다원합금재Biot≤0.1조건하적응고.기우제출적확전모형급산법,제출일충고필전열영향적예측Biot≦0.1합금응고로경급미관편석적방법.해산법여Thermo-Calc열역학계산연건접구정서TQ6상우합,용우실시계산매차질대수요적열역학수거.Al-2Si-3Mg삼원합금실례계산증실제출적모형급산법화응고로경여미관편석예측방법적실용성여가고성,Al-5.17Cu-2.63Si삼원합금응고실험결과여예측결과적취득교호적일치성.
A binary continuum model for dendritic solidification transport phenomena and corresponding numerical algorithm for the strong nonlinear coupling of T-fs-CL were extended to multicomponent alloys solidified under condition of Biot≤0.1.Based on the extended model/algorithm,a method considering heat transfer was proposed to predict the solidification paths and microsegregation of alloys solidified under the same condition.The new algorithm and method were closely coupled with the commercial Thermo-Calc package via its TQ6-interface codes for instantaneous determination of the related thermodynamic data at each calculation time step.The sample simulation performed on an Al-2Si-3Mg alloy system indicates the availability and reliability of the model/algorithm and the proposed method for predicting solidification paths and microsegregation.Computional and experimental investigations on an A1-5.17Cu-2.63Si ternary alloy were conducted,and a reasonable agreement between the computation and experiment was obtained.