J Mater Sci Technol ›› 1993, Vol. 9 ›› Issue (1): 25-31.

• Articles • Previous Articles     Next Articles

Solidification Microstructures of a Single-crystal Superalloy under Ultra-high Temperature Gradient Conditions

Zhuangqi HU Huaming WANG Institute of Metal Research,Academia Sinica,Shenyang,110015,ChinaY.Murata M.Morinaga Toyohashi University of Technology,Toyohashi,Aichi,440 Japan   

  • Received:1993-01-28 Revised:1993-01-28 Online:1993-01-28 Published:2009-10-10

Abstract: The solidification microstructures and solute segregation of a newly developed hot corrosion resistant single-crystal Ni-base superalloy were investigated with a zone-melting and ultra-high thermal gradient unidirectional solidification apparatus.Compared with the microstructures solidified at conventional low thermal gradient conditions,the dendrite arm spacings,the interdendritic microporosity and γ/γ' eutectic,and the severity of solute segregation of the single-crystal superalloy solidified at ultra-high thermal gradient conditions were considerably reduced.It was shown that the microstructure solidified under ultra-high thermal gradient condition is ideal for the full exploitation of the excellent property potentials of single-crystal superalloys.

Key words: single-crystal superalloy, solidification microstructure, temperature gradient