真空条件下锭模参数对铁镍合金缩孔分布的影响

Effect of molding parameters on porosity distribution in Fe-Ni alloy ingots under vacuum circumstance

摘要: 为了减轻铸件顶部缩孔缺陷以降低冒头切除率提高铸锭成材率，基于ProCAST软件建立了铁镍合金真空下凝固数值仿真模型，通过解剖实验验证了模拟参数正确性，进而研究锭模参数对铁镍合金缩孔缩松分布的影响并得到最优锭型.研究表明：数值模拟中，关于真空条件下传热参数的设置较为合理，能较准确地模拟得到与实际生产一致的缩孔缺陷；在本研究条件下，冒口锥度对缩孔高度方向上位置的影响远大于锭身锥度和高径比对其的影响，缩孔位置随冒口锥度减小上移，中心疏松程度随锭身锥度增加而减弱，高径比对缩孔缩松影响不大；优化后的锭型能有效改善缩孔缺陷，将缩孔控制在冒口线以上提高铸锭成材率.

Abstract: To reduce shrinkage cavity defects in Fe-Ni alloy ingots,a numerical simulation model was established by using the finite element software ProCAST. The simulation parameters were verified by anatomical experiment. The effect of molding parameters on porosity distribution in Fe-Ni alloy ingots was investigated and an optimized ingot was obtained. It is found that the parameter setting of heat transfer under vacuum circumstance is relatively reasonable,and the simulation results produce a good fit...