The Numerical Simulation For Investment Precision Casting Of 3D-Kagome Truss Core Of IN718 Alloy

Sand wich structure with 3D-Ka gome truss core, a new truss core structurewith superior mecha nica l, is brought forward in recent years. Compared withpyra mida l and tetra hed ral truss cores, 3D-Ka gome truss core possesses the higherstrength, grea t resista nc e to plastic buck ling and the excellent isotropicperforma nce.In this paper, 3D-Ka gome truss core was considered as the object of study,based on AnyCasting of casting process simula tion softwa re. The numerica lsimula tion process of the 3D-Ka gome truss core on Inconel718 supera lloyinvestment casting was ana lysied. The effects of ga ting system, parameters(pouringtemperature and prehea ted temperature of shell mould ) to the figura tion of trusscore were also resea rched , and studied the microstructures and mecha nica lproperty of Inconel718 supera lloy.To understa nd the characteristics of investment casting of 3D-Ka gome trusscore, different ga ting systems were designed. In addition, the defect of the trusscore panels was pred icted by the criterion of Niya ma: the poles in the midd le of thetruss core panels were the most likely to form shrinka ge cavity and porosity.The defect pred iction in filling seq uence and solid ifica tion seq uence ofsupera lloy Inconel718 showed tha t the probability of defect decreased with theincreasing of the pouring temperature when the prehea ted temperature of the shellmould was content, ho wever the probability of defect increased when pouringtemperature was too high; higher prehea ted temperature of shell mould was benefitfor figura tion of truss core when the pouring temperature was fixed, but theprobability of defects increased if the prehea ted temperature of shell mould was toohigh; the probability of defects decreased with wid th and increasing qua ntity of slotga ting system, too. Therefore, the effects of slot ga ting system, pouring temperatureand prehea ted temperature of shell mould based on orthogona l test were disscussed,we obta ined tha t the optimum combina tion was when the pouring temperature was1460℃, prehea ted temperature of shell mould was 860℃with double slot ga tingsystem.The 3D-Ka gome truss core was successfully cast on Inconel718 supera lloy invacuum ind uction furnace on the cond ition sta ted above.