K4169合金离心铸管工艺模拟及试制研究

采用ProCAST软件对K4169合金的离心铸造工艺进行了模拟研究。通过分析浇注速度、铸型转速、浇注温度及铸型温度对离心铸管充型及凝固行为的影响,获得了外径56 mm/内径38 mm的K4169合金离心铸管最佳制备工艺参数。在此工艺参数条件下,K4169合金离心铸管可实现连续稳定充型,离心铸管壁厚差为0.2 mm,内表面疏松比例小于3%,且柱状晶平均宽度为1.7 mm。结合模拟结果对K4169合金离心铸管进行试制,所制备的离心铸管显微组织中柱状晶占比80%,且晶粒组织细小,因而离心铸管具有优异的高温塑性。

Casting Process Simulation and Trial Production of K4169 Alloy Centrifugal Tube

The centrifugal casting process of K4169 alloy tube was simulated by ProCAST software.By analyzing the effects of pouring speed,mold speed,pouring temperature and mold temperature on the filling and solidification behavior of centrifugal cast pipe,the optimal preparation process parameters of K4169 alloy centrifugal casting pipe with outer diameter of 56 mm and inner diameter of 38 mm were obtained.Under these conditions,continuous and stable mold filling can be realized for K4169 alloy centrifugal casting pipe.The wall thickness difference of centrifugal casting pipe is 0.2 mm,the porosity ratio of inner surface is less than 3%,and the average width of columnar crystal is 1.7 mm.Combined with the simulation results,the centrifugal casting pipe of K4169 alloy was trial-produced.The columnar crystal accounts for 80%of the microstructure,and the grain structure is fine,so the centrifugal casting pipe has excellent high temperature plasticity.