Effect of minor alloying additions on the solidification of single-crystal Ni-base superalloys

Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys

“…During DS casting of Ni-base superalloys, solidification usually occurred in the order of g dendrites, MC carbides and g/g 0 eutectics [18,21] . MC carbides were produced preferentially in the interdendritic regions where the liquid was enriched in Ta, Ti, Hf and C. Based on our present observations, the morphology evolution mechanism of MC carbides with increasing carbon content is proposed and illustrated in Fig.…”

Creep Behavior at 1273 K (1000 °C) in Nb-Bearing Austenitic Heat-Resistant Cast Steels Developed for Exhaust Component Applications

“…In general, interdendritic regions and grain boundaries are well recognized as the weakness for mechanical properties in cast alloys, since these last solidified regions usually contain remarkable concentration of casting segregations and defects. [21,22] The eutectic precipitation of primary ''Chinese-script'' Nb(C,N) with relatively small lamellar spacing strengthened these interdendritic regions. Moreover, the relatively higher number density of Nb(C,N) at serrated grain boundaries should make grain boundary sliding more difficult and also increased the path for grain boundary diffusion.…”

Effect of carbon content on the microstructure and creep properties of a 3rd generation single crystal nickel-base superalloy

“…Liu and Chen [8,16] found that the formation of porosity is suppressed by the addition of carbon due to volume expansion of MC carbides. However, an increase volume fraction of porosity is observed by Al-Jarba and Culter [7,17] with carbon additions. Moreover, the H-pore formed during homogenization has been observed, and the volume fraction of H-pore exhibits the same level as that of S-pore formed during solidification [18][19][20].…”