Effect of carbon additions on the microstructure in a Mi-base single crystal superalloy

摘要

The microstructure of experimental nickel-base single crystal superalloys with different levels of carbon has been studied. With increasing carbon addition, the incipient melting point decreases obviously and the carbide morphology is changed from blocky to script-like shape. Minor carbon addition also affects the shrinkage porosity and eutectic in as-cast state. The segregation behavior of elements W and Ta is also influenced by the minor carbon addition.