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

Formation of the Surface Eutectic of a Ni-based Single Crystal Superalloy

Cao Liang1, Yao Li2, Zhou Yizhou1,*(), Jin Tao1, Sun Xiaofeng1   

  1. 1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    2 AVIC Aviation Engine Corporation PLC, Xi'an 710021, China
  • Received:2015-06-18 Revised:2015-09-23 Accepted:2015-11-23 Online:2017-04-15 Published:2017-05-24
  • Contact: Zhou Yizhou

Abstract:

The microstructure, size, elemental composition and hardness of the surface eutectic layer formed during directional solidification of a Ni-based single crystal superalloy were studied. The formation mechanisms of the surface eutectic on the outer surface of the casting were also discussed. The metal/mould interactions did not play any role in the formation of the surface eutectic. The formation cause of surface eutectic layer was attributed to the interdendritic residual liquid for excretion caused by solidification shrinkage.

Key words: Surface eutectic, Ni-based single crystal, Superalloy