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液态金属冷却定向凝固数值模拟与试验研究

ISSN号：1001-2249
期刊名称：《特种铸造及有色合金》
时间：0
分类：TP311[自动化与计算机技术—计算机软件与理论;自动化与计算机技术—计算机科学与技术] TG139[金属学及工艺—合金;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[1]清华大学材料学院先进成形制造教育部重点实验室,北京100084, [2]沈阳铸造研究所
相关基金：国家重点基础研究发展计划（973计划）资助项目（2011CB706801）; 国家自然科学基金资助项目（51171089;51374137）; 国家科技重大专项资助项目（2012ZX04012-011;2011ZX04014-052）

作者：闫学伟[1], 唐宁[1], 刘孝福[2], 税国彦[2], 郭新力[2], 许庆彦[1], 柳百成[1]

关键词：定向凝固, 液态金属冷却, 数理模型, 数值模拟, Directional Solidification, LMC, Mathematical and Physical Model, Numerical Simulation

中文摘要：

建立了定向凝固液态金属冷却工艺的温度场和微观组织数学模型,开发了具有自主知识产权的模拟软件。通过测温试验及晶粒组织形貌的对比验证了模型的准确性。基于温度场的模拟结果,预测了铸件的显微缩松缺陷,并和试验进行了对比,发现试验和模拟结果符合良好。对实际铸件进行了晶粒组织的腐蚀,结合模拟结果,分析了铸件容易产生杂晶的部位,提出了相应的防止措施。

英文摘要：

Mathematical and physical models of liquid metal cooling process were established to simulate the temperature field and microstructure.A simulation software with independent intellectual copyright was developed.The accuracy of the model developed were validated by the cooling curves and grain structure morphology.The micro-porosity in the castings based on the temperature filed was predicted to compare with experimental ones.The simulated results were well in agreement with the experimental ones.Combining with the grain etching for the casting and simulation results,the possible position for the stray grain has been analyzed.Then,some corresponding measures were presented.

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