J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (4): 347-351.DOI: 10.1016/j.jmst.2016.08.014
• Orginal Article • Previous Articles Next Articles
Cao Liang1, Yao Li2, Zhou Yizhou1,*(), Jin Tao1, Sun Xiaofeng1
Received:
2015-06-18
Revised:
2015-09-23
Accepted:
2015-11-23
Online:
2017-04-15
Published:
2017-05-24
Contact:
Zhou Yizhou
Cao Liang, Yao Li, Zhou Yizhou, Jin Tao, Sun Xiaofeng. Formation of the Surface Eutectic of a Ni-based Single Crystal Superalloy[J]. J. Mater. Sci. Technol., 2017, 33(4): 347-351.
Fig. 1. (a) OM image of the surface and internal eutectics, (b) SEM image of the surface eutectic, and (c) SEM image of the internal eutectic in the transverse section of the SC bar.
Elements | Surface eutectic | Internal eutectic |
---|---|---|
Al | 7.64 | 7.59 |
Ta | 7.83 | 7.52 |
W | 2.44 | 2.45 |
Co | 6.66 | 6.47 |
Cr | 3.59 | 3.60 |
Mo | 1.21 | 1.14 |
Re | 0.93 | 0.85 |
Hf | 0.54 | 0.57 |
Ni | Bal. | Bal. |
Table 1 Principal elements of the surface and internal eutectics in the SC bars (wt%)
Elements | Surface eutectic | Internal eutectic |
---|---|---|
Al | 7.64 | 7.59 |
Ta | 7.83 | 7.52 |
W | 2.44 | 2.45 |
Co | 6.66 | 6.47 |
Cr | 3.59 | 3.60 |
Mo | 1.21 | 1.14 |
Re | 0.93 | 0.85 |
Hf | 0.54 | 0.57 |
Ni | Bal. | Bal. |
Eutectic occurrence | Hardness 1 | Hardness 2 | Hardness 3 | Average |
---|---|---|---|---|
Surface | 507.87 | 507.27 | 507.87 | 507.67 |
Internal | 507.41 | 507.87 | 507.87 | 507.71 |
Table 2 Vickers hardness values for the surface and internal eutectics in the SC bars
Eutectic occurrence | Hardness 1 | Hardness 2 | Hardness 3 | Average |
---|---|---|---|---|
Surface | 507.87 | 507.27 | 507.87 | 507.67 |
Internal | 507.41 | 507.87 | 507.87 | 507.71 |
Fig. 5. (a) Schematic diagram of different stages of solidification (early and later stages) and the shrinkage of dendrites, (b) the movement of dendrites and flow of liquid in the interdendritic zone when secondary dendrite arms have not impinged on the mould and (c) movement of dendrites and flow of liquid in the interdendritic zone when the secondary dendrite arms have impinged on the mould.
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