TiAl合金熔模精铸件缩孔形成的数值模拟及预测  

Numerical Simulation for Shrinkage Hole (Porosity) Formation in TiAl Alloy Product in Investment Casting

作　　者：李邦盛[1] 王狂飞[2] 吴士平[1] 米国发[2] 毕维升[1] 郭景杰[1] 傅恒志[1] 

机构地区：[1]哈尔滨工业大学 [2]河南理工大学

出　　处：《特种铸造及有色合金》2005年第5期280-283,共4页Special Casting & Nonferrous Alloys

摘　　要：提出了广度关联搜索孤立区的新方法,结合等效液面收缩量法对TiAl合金精铸叶片缩孔形成过程进行了数值模拟,并预测了铸件缩孔的大小及产生的位置。采用熔模精铸工艺浇注了TiAl合金叶片,并对铸件进行了解剖,解剖断面与数值模拟结果进行了对比,模拟结果与解剖结果基本符合。表明这种模拟缩孔的方法可以准确地预测缩孔的大小和缩孔的位置。A method of extensive scouting of liquid isolated section combining with the calculation of solidification shrinkage in the equivalent liquid pools was put forward to simulate the shrinkage hole formation in TiAl alloy castings in investment casting,meanwhile,the size and formed location of the shrinkage hole were predicted.The simulated results are well in agreement with the practical results,indicating that the method can accurately predict the size and location of the shrinkage hole.

关 键 词：TIAL合金 熔模精铸件 数值模拟 缩孔 孤立区 

分 类 号：TG249.5[机械工程—精密仪器及机械] TG146.2[金属学及工艺—铸造]