Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 476, Issue 1-2, Pages 372-377Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.06.041
Keywords
nickel-base superalloy; gamma' phase; carbide; ternary eutectic
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Scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron probe microanalysis (EPMA) and differential scanning calorimetry (DSC) were used to study the effect of minor niobium addition on as-cast microstructure of a nickel-base directionally solidified superalloy. A proper niobium addition resulted in the formation of homogeneous gamma' particles almost with the same size throughout the whole dendrite. The ternary eutectic reaction L -> (M23C6 + gamma + gamma') occurred with increasing niobium content, but no eutectic was found when mobium content was high enough because the NbC preferably precipitated and the eutectic reaction was suppressed. (C) 2007 Elsevier B.V. All rights reserved.
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