论文部分内容阅读
对TiAl合金涡轮的立式离心熔模陶瓷型壳精密铸造进行了研究,合金熔配设备为水冷铜坩埚真空感应熔化炉。首先研究了TiAl合金铸造时的尺寸收缩问题,结果表明1600℃浇注时,合金的收缩率为1.32%,随着浇注温度的提高凝固收缩率显著提高。从合金熔体立式离心力场下充型模式方面考虑,涡轮浇注工艺应采用类似于重力充型的底注式较好。TiAl合金涡轮离心浇注内部组织致密、无气孔,存在的主要问题是欠浇缺陷,迎流面充型较弱。可以从提高离心转速和浇注温度两方面解决欠浇缺陷,但离心转速提高带来的安全隐患以及提高浇注温度带来的粘砂问题还需进一步研究。
The vertical centrifugal casting mold shell of TiAl alloy turbine is studied. The alloy melting equipment is water-cooled copper crucible vacuum induction melting furnace. First of all, the dimensional shrinkage problem of TiAl alloy during casting was studied. The results show that the shrinkage rate of TiAl alloy is 1.32% when casting at 1600 ℃. The solidification shrinkage increases remarkably with the increase of pouring temperature. From the aspect of the filling mode of centrifugal melt in the vertical direction of alloy melt, the turbine injection process should be similar to the gravity filling of the bottom-injection method. Centrifugal TiAI alloy centrifugal casting internal organization of dense, non-porosity, the main problem is the lack of pouring defects Ying Ying surface filling is weak. Can improve the centrifugal speed and pouring temperature from two aspects to solve the under-cast defects, but the safety problems caused by increased centrifugal speed and sticky sand to raise the pouring temperature issues need further study.