Thermo-Calc and T-f_S-C_L coupling based method to determine solidification paths of alloys solidified under condition of Biot≤0.1  

基于Thermo-Calc及T-f_S-C_L耦合方法预测Biot≤0.1的合金凝固路径(英文)

作　　者：ZHAO Guang-wei LI Xin-zhong XU Da-ming GUO Jing-jie FU Heng-zhi DU Yong HE Yue-hui 赵光伟;李新中;徐达鸣;郭景杰;傅恒志;杜勇;贺跃辉(哈尔滨工业大学材料科学与工程学院,哈尔滨150001;中南大学粉末冶金国家重点实验室,长沙410083)

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第1期139-146,共8页中国有色金属学报（英文版）

基　　金：Projects (2008112042) supported by the Open Project of State Key Laboratory of Powder Metallurgy of Central South University, China;Projects (50771041, 50801019) supported by the National Natural Science Foundation of China;Project (2011CB610406) supported by the National Basic Research Program of China

摘　　要：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 Al-5.17Cu-2.63Si ternary alloy were conducted, and a reasonable agreement between the computation and experiment was obtained.将二元合金枝晶凝固传输模型及相应的T-fS-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。

关 键 词：THERMO-CALC solidification transport solidification paths MICROSEGREGATION 

分 类 号：TG111.4[金属学及工艺—物理冶金]