Numerical Determination of Secondary Dendrite Arm Spacing for IN738LC Investment Castings

作者：Franke M M^*; Hilbinger R M; Konrad C H; Glatzel U; Singer R F

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2011, 42A(7): 1847-1853.

DOI：10.1007/s11661-010-0585-8

A numerical model was developed to estimate the solidification conditions and the secondary dendrite arm spacing of equiaxed solidified IN738LC investment castings. The model, composed of geometric data, thermophysical properties, and boundary conditions, was verified by a comparison of calculated and measured process temperatures obtained from casting experiments. The computation of the secondary dendrite arm spacing was carried out from temperature gradient G, solidification rate v, and an alloy-specific parameter M, determined by means of an inverse approach. The calculated secondary dendrite arm spacing was found to be in very good agreement with metallographic measurements.

• 出版日期2011-7