TY - JOUR
T1 - Simulations of microporosity in IN718 equiaxed investment castings
AU - Sung, P. K.
AU - Poirier, D. R.
AU - Felicelli, S. D.
AU - Poirier, E. J.
AU - Ahmed, A.
N1 - Funding Information:
This work was supported by the Division of International Programs of the National Science Foundation (USA) and by Consejo Nacional de Investigaciones Cientı́ficas y Técnicas (Argentina), under the frame of the international cooperation project “Simulation of Defects in Castings”. Also, P.K.S. and D.R.P. appreciate the grant provided by National Science Foundation (DMR-9901290) and the support of Sandia National Laboratories, and S.D.F. appreciates the grant provided by Agencia Nacional de Promoción Cientı́fica y Tecnológica (PICT98 12-03239). Our many discussions with Professor J.C. Heinrich of The University of Arizona on subjects of transport phenomena and finite element formulations have always been very helpful.
PY - 2001/6
Y1 - 2001/6
N2 - A finite element model for simulating dendritic solidification of multicomponent-alloy castings has been enhanced to include the calculation of pressure and redistribution of gas-forming elements during solidification and cooling. The model solves the conservation equations of mass, momentum, energy and alloy components, and the gas-forming elements, hydrogen and nitrogen. By solving the transport of gas solutes and comparing their Sievert's pressure with the local pressure, the model can predict regions of possible formation of intergranular porosity. Calculations were performed on equiaxed Ni-base superalloy (IN718) plate castings. The potential to form microporosity was analyzed with different variables including the mass transfer of hydrogen and nitrogen from the casting to the casting/mold gap, the final grain size, a grain-shape parameter and the thickness of the plate casting. The most important factor was found to be the mass transfer coefficient. The results were also affected by the final grain size and grain-shape parameter.
AB - A finite element model for simulating dendritic solidification of multicomponent-alloy castings has been enhanced to include the calculation of pressure and redistribution of gas-forming elements during solidification and cooling. The model solves the conservation equations of mass, momentum, energy and alloy components, and the gas-forming elements, hydrogen and nitrogen. By solving the transport of gas solutes and comparing their Sievert's pressure with the local pressure, the model can predict regions of possible formation of intergranular porosity. Calculations were performed on equiaxed Ni-base superalloy (IN718) plate castings. The potential to form microporosity was analyzed with different variables including the mass transfer of hydrogen and nitrogen from the casting to the casting/mold gap, the final grain size, a grain-shape parameter and the thickness of the plate casting. The most important factor was found to be the mass transfer coefficient. The results were also affected by the final grain size and grain-shape parameter.
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U2 - 10.1016/S0022-0248(01)01380-X
DO - 10.1016/S0022-0248(01)01380-X
M3 - Article
AN - SCOPUS:0035366021
VL - 226
SP - 363
EP - 377
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
SN - 0022-0248
IS - 2-3
ER -