Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1582857 | Materials Science and Engineering: A | 2008 | 6 Pages |
Abstract
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 γⲠparticles almost with the same size throughout the whole dendrite. The ternary eutectic reaction L â (M23C6 + γ + γâ²) occurred with increasing niobium content, but no eutectic was found when niobium content was high enough because the NbC preferably precipitated and the eutectic reaction was suppressed.
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Authors
K. Zhao, L.H. Lou, Y.H. Ma, Z.Q. Hu,