型壳材料对高温合金叶片组织和性能的影响

Influence of Ceramic Shell Material on the Microstructure and Properties of Superalloy Blade

采用数值模拟方法并结合试验,研究了型壳材料对高温合金叶片组织和性能的影响。结果表明,无陶瓷保温棉时,氧化铝型壳铸件的冷却速率大于莫来石型壳,氧化铝型壳铸件组织及性能较优;有陶瓷保温棉时,氧化铝型壳铸件叶根处冷却速率略低于莫来石型壳铸件,叶身处冷却速率高于莫来石型壳铸件,莫来石型壳铸件叶根处组织及性能比氧化铝型壳铸件略优,叶身组织及性能比氧化铝型壳铸件略差。有陶瓷保温棉时的铸件叶根组织数值模拟结果和试验结果符合。

The effects of ceramic shell materials on microstructure and properties of superalloy blade were investigated by numerical simulation combined with experiments.The results reveal that the cooling rate of alumina shell casting is greater than that of mullite shell casting without ceramic insulating cotton wrapping,and the microstructure and properties of alumina shell casting are better.When the casting is wrapped with ceramic insulating cotton,although the cooling rate of airfoil of alumina shell casting is still greater than that of mullite shell casting,the cooling rate of root of alumina shell casting is less than that of mullite shell casting,which means that the microstructure and properties of root of mullite shell casting are better,while the airfoil of that are worse.The numerical simulation results of the airfoil is coincided with the experimental ones when wrapped with ceramic insulating cotton.