Volume 18 Issue 6
Dec.  2003
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LI Ying, SU Bin. Mechanisms of Low Cyclic Fatigue of DD6 Alloy at Elevated Temperature[J]. Journal of Aerospace Power, 2003, 18(6): 732-736.
Citation: LI Ying, SU Bin. Mechanisms of Low Cyclic Fatigue of DD6 Alloy at Elevated Temperature[J]. Journal of Aerospace Power, 2003, 18(6): 732-736.
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Mechanisms of Low Cyclic Fatigue of DD6 Alloy at Elevated Temperature

  • Beijing Institute of Aeronautical Materials,Beijing100095,China

  • Received Date: 2003-01-24
  • Rev Recd Date: 2003-04-08
  • Publish Date: 2003-12-28
    Abstract
  • Low cycle fatigue mechanism of a single crystal nickel-base superalloy,DD6,has been investigated at 760℃ and 980℃.It was found that there were two kinds of sites where crack initiates,one being the surface of the specimens and the other being the sub-surface.Microcracks and oxide layer on the specimen surface are potential crack initiation sites in this superalloy.Secondary crack,reared ridge, and microcrack in the front of the main crack tip can all hinder crack propagation during low cycle fatigue.

     

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