%0 Journal Article
%T Influence of directional solidification variables on primary dendrite arm spacing of Ni-based superalloy DZ125
%A Zhang Weiguo
%A Liu Lin
%A Huang Taiwen
%J China Foundry
%D 2009
%I Foundry Journal Agency
%X The primary dendrite morphology and spacing of DZ125 superalloy have been observed during directional solidifi cation under high thermal gradient about 500 K/cm. The results reveal that the primary dendrite arm spacing decreases from 94 ¦Ìm to 35.8 ¦Ìm with the increase of directional solidifi cation cooling rate from 2.525 K/s to 36.4 K/s. The regression equation of the primary dendrite arm spacings ¦Ë1 versus cooling rate is ¦Ë1=0.013(GV)-0.32. The predictions of Kurz/Fisher model and Hunt/Lu model accord reasonably well with the experimental data. The infl uence of directional solidifi cation rate under variable thermal gradient on the primary dendrite arm spacing has also been investigated.
%K directional solidifi cation
%K thermal gradient
%K cooling rate
%K primary dendrite arm spacing
%K superalloy
%U http://www.foundryworld.com/uploadfile/200912731126981.pdf