采用正交设计优化单晶合金定向凝固数值模拟参数

稀有金属材料与工程, 2010, 39(5): 767-770.

采用正交设计优化单晶合金定向凝固数值模拟参数

1.北京航空材料研究院,先进高温结构材料国防科技重点实验室,北京,100095

2.北京航空材料研究院,先进高温结构材料国防科技重点实验室,北京,100095

3.清华大学,北京,100084

4.北京航空材料研究院,先进高温结构材料国防科技重点实验室,北京,100095

基金项目: National Natural Science Foundation of China(10477010) Beijing Institute of Aeronautical Materials Foundation(KF40070122)

关键词：数值模拟 , 单晶高温合金 , 定向凝固参数 , 热交换系数 , 正交设计

Study of Heat Transfer Coefficient Used in the Unidirec- tional Solidification Simulation Based on Orthogonal Design

Jin Haipeng ^1, , Li Jiarong ^2, , Yu Jing ^3, , Liu Shizhong ^4,

1.北京航空材料研究院,先进高温结构材料国防科技重点实验室,北京,100095

2.北京航空材料研究院,先进高温结构材料国防科技重点实验室,北京,100095

3.清华大学,北京,100084

4.北京航空材料研究院,先进高温结构材料国防科技重点实验室,北京,100095

Keywords： numerical simulation , single crystal superalloy , simulation parameter , heat transfer coefficient , orthogonal design

采用正交设计方法研究单晶高温合金定向凝固过程数值模拟所需参数对温度场和冷却曲线的影响.结果表明:单晶高温合金凝固曲线对模拟参数十分敏感,特别敏感于铸件与铸型之间的界面换热系数.通过正交设计获得边界条件参数使模拟结果与试验结果吻合良好.确定符合DD6单晶高温合金凝固过程的数值模拟边界条件.

Orthogonal design was applied to analyze the effect of simulation parameters on the thermal field and cooling curve during directional solidification using commercial finite-element analysis software ProCAST. The results show that solidification curves of single crystal superalloy vary greatly with several numerical simulation parameters and are particularly sensitive to the values of the heat transfer coefficient between the mold and test slab casting without core. The predictions of the temperature filed during solidification for slab geometries were compared with experimental results and calculated cooling curves are in good agreement with experimental measurements. The simulation parameters that had the greatest influence on high rate solidification (HRS) casting process simulation results were modified and determined.

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