高Nb-TiAl增压涡轮熔模铸造过程数值模拟  

Numerical Simulation of Investment Casting Process for High Nb-TiAl Turbocharger

作　　者：杨亮[1] 张来启[1] 林均品[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《热加工工艺》2014年第19期72-74,共3页Hot Working Technology

摘　　要：采用Procast铸造模拟软件模拟了两种浇注方式(顶注式与侧注式)下的Ti-45Al-8Nb合金增压涡轮重力及离心铸造工艺过程。结果显示,在重力铸造条件下,两种浇注方式均存在浇不足缺陷。侧注式较顶注式充填率高。铸件的充型率与模壳的预热温度成正比,即提高模壳的预热温度可以有效增加充型率。在离心浇注(400 r/min)时,两种浇注方式均能使金属液充满型腔。顶注式铸件的缩孔、缩松存在于增压涡轮心部,而侧注式则分布于涡轮片中,并且顶注式的缩孔、缩松缺陷体积比侧注式大很多。Gravity and centrifugal casting processes with top pouring and side pouring ways for Ti-45Al-8Nb alloy turbocharger were simulated by using the casting simulation software Procast. The results show that under the gravity casting condition, misrun defects exist in both casting ways. The filling rate of side casting is higher than that of top casting. The filling rate is proportional to the preheat temperature of casting mold. That is, improving the mold preheating temperature could effectively increase the filling rate. During centrifugal casting（400r/min）, two casting ways could fill the cavities. The shrinkage porosity defects of top casting way exist in the heart of turbines, while in the blades of side casting way. The volume of porosity defect of turbochargers in top casting way is much bigger than that of turbochargers in side casting way.

关 键 词：Procast模拟 高Nb-TiAl 增压涡轮 离心铸造 重力铸造 

分 类 号：TG249.4[金属学及工艺—铸造]